阅读说明：本技术 废气处理系统以及处理方法 (Exhaust gas treatment system and treatment method ) 是由 奥古斯特森·欧拉 孙浩 于 2018-06-12 设计创作，主要内容包括：本发明提供一种废气处理系统以及方法。所述系统包括蓄热式氧化(RTO)设备、与所述RTO设备并行连接的旁通分流模块和设置在所述RTO设备的下游的混合模块；其中所述RTO设备构造成用于氧化处理第一部分废气而形成热尾气并将预设流量的热尾气输送到其外,所述混合模块接收所述预设流量的热尾气；所述旁通分流模块构造成接收且使第二部分废气绕过所述RTO设备而进入所述混合模块中；其中所述第二部分废气在所述混合模块中从所述预设流量的热尾气中吸收足以使其中的有机物氧化分解的热量。(The invention provides an exhaust gas treatment system and a method. The system comprises a Regenerative Thermal Oxidation (RTO) device, a bypass shunt module connected with the RTO device in parallel and a mixing module arranged at the downstream of the RTO device; wherein the RTO plant is configured for oxidatively treating a first portion of the exhaust gas to form a hot tail gas and delivering a predetermined flow of the hot tail gas thereto, the mixing module receiving the predetermined flow of the hot tail gas; the bypass diverter module is configured to receive and bypass a second portion of the exhaust gas around the RTO device into the mixing module; wherein the second portion of exhaust gas absorbs heat from the predetermined flow rate of hot exhaust gas in the mixing module sufficient to oxidatively decompose organic matter therein.)

1. An exhaust treatment system, comprising:

a regenerative oxidation device configured to oxidatively treat a first portion of the exhaust gas to form a hot tail gas, and to deliver a predetermined flow of the hot tail gas outside the regenerative oxidation device;

the mixing module is arranged at the downstream of the regenerative oxidation equipment and is used for receiving the hot tail gas with the preset flow rate from the regenerative oxidation equipment; and

a bypass diverter module configured to be connected in parallel with the regenerative oxidation device and configured to receive and route a second portion of the exhaust gas to the mixing module bypassing the regenerative oxidation device;

wherein the second portion of exhaust gas absorbs heat in the mixing module from the predetermined flow of hot exhaust gas from the regenerative thermal oxidizer sufficient to oxidatively decompose organic matter in the second portion of exhaust gas.

2. The system of claim 1, further comprising an exhaust gas source for supplying a total exhaust gas consisting of the first portion of exhaust gas and the second portion of exhaust gas, the first portion of exhaust gas comprising a weight or volume percentage in the total exhaust gas in the range of 10% to 90%, and the second portion of exhaust gas comprising a weight or volume percentage in the total exhaust gas in the range of 90% to 10%, respectively.

3. The system of claim 1, wherein the regenerative thermal oxidizer comprises an oxidation chamber and a inline duct fluidly connected to the oxidation chamber, wherein the oxidation chamber is configured to oxidatively decompose organic matter in the first portion of exhaust gas to form the hot exhaust gas and deliver the predetermined flow of the hot exhaust gas to the mixing module via the inline duct.

4. The system of claim 3, wherein a flow ratio of the preset flow of hot exhaust gas to the second portion of exhaust gas in the mixing module is in a range of 1:1 to 15: 1.

5. The system of claim 1, wherein the first portion of the exhaust gas and/or the second portion of the exhaust gas comprises a combustible gas having volatile organics, the combustible gas having an energy value of 100kJ/Nm³To 1000kJ/Nm³Within the range of (1).

6. A system according to claim 5, wherein the first portion of exhaust gas and/or the second portion of exhaust gas comprises a gas having an energy value of 100kJ/Nm³、500kJ/Nm³Or 1000kJ/Nm³The combustible gas of (1).

7. The system of claim 1, further comprising at least one mixer external to the regenerative oxidizer and at least one dilution air supply for supplying dilution air to enable the first portion of the exhaust gas and/or the second portion of the exhaust gas to obtain oxygen sufficient to oxidatively decompose organic matter therein, the at least one mixer for mixing the first portion of the exhaust gas and/or the second portion of the exhaust gas with dilution air prior to being supplied to the regenerative oxidizer and/or the mixing module.

8. The system of claim 1, further comprising a plurality of injectors, the mixing modules each comprising a plurality of mixing sections, wherein the plurality of injectors are spaced apart in the mixing module along the direction of gas flow for injecting the second portion of exhaust gas in the mixing section of the mixing module.

9. The system of claim 8, further comprising a plurality of mixer banks disposed therein transverse to the mixing module in a direction perpendicular to the airflow, and each disposed correspondingly downstream of the plurality of injectors for enhancing mixing between the second portion of exhaust gas and the predetermined flow of hot exhaust gas.

10. A method of exhaust gas treatment, comprising:

providing a regenerative oxidation device;

leading the first part of waste gas into a heat accumulating type oxidation device for oxidation treatment to form hot tail gas and conveying the hot tail gas with preset flow rate out of the heat accumulating type oxidation device; and

directing a second portion of the exhaust gas to bypass the regenerative oxidation device and mix downstream of the regenerative oxidation device with the predetermined flow of hot exhaust gas from the regenerative oxidation device such that the second portion of the exhaust gas absorbs heat from the predetermined flow of hot exhaust gas sufficient to oxidatively decompose organic matter in the second portion of the exhaust gas.

Technical Field

The present invention relates generally to exhaust gas treatment, and more particularly to an exhaust gas treatment system and method.

Background

Regenerative Thermal oxidizers or Regenerative Thermal oxidizers (hereinafter "RTO devices") are commonly used for treating exhaust gases, in particular exhaust gases containing organic substances (hereinafter organic exhaust gases), which oxidize the organic substances in the organic exhaust gases at high temperatures into the corresponding carbon dioxide (CO)₂) And water (H)₂O) to purify the exhaust gas and recover heat released when the organic matter is decomposed. The common Organic Compounds in the Organic waste gas include Volatile Organic Compounds (VOC or VOCs), and VOC is mainlyIncluding alkanes, alcohols, aromatics, olefins, halocarbons, esters, aldehydes, ketones and other organic compounds, the emission of VOC may be caused by the production process, product consumption behavior, motor vehicle exhaust, etc. of related industries such as petrochemical industry, pharmaceutical manufacturing, equipment manufacturing, etc.

In one or more prior art techniques, substantially all of the organic waste gas to be treated is directed to the RTO plant for treatment. For organic waste gases with higher VOC concentrations, the RTO plants of the prior art are larger in size and manufacture to provide correspondingly large volumes, which increases costs.

Accordingly, it is desirable to provide an exhaust treatment technique that overcomes the problems of the prior art described above.

Disclosure of Invention

In one aspect of the disclosure, an exhaust gas treatment system is disclosed that includes a regenerative oxidation device, a mixing module disposed downstream of the regenerative oxidation device, and a bypass split module configured to be connected in parallel with the regenerative oxidation device. The regenerative oxidation device is configured to oxidatively process a first portion of the exhaust gas to form a hot tail gas and to deliver a predetermined flow of the hot tail gas outside the regenerative oxidation device. The mixing module is used for receiving the hot tail gas with the preset flow from the heat accumulating type oxidation equipment. The bypass diverter module is configured to receive and route a second portion of the exhaust gas to the mixing module bypassing the regenerative oxidation device. The second portion of exhaust gas absorbs heat in the mixing module from the predetermined flow of hot exhaust gas from the regenerative oxidation device sufficient to oxidatively decompose organic matter in the second portion of exhaust gas.

One aspect of the present disclosure described above relating to "an exhaust gas treatment system" may be embodied as claim 1.

The present disclosure also provides technical scheme 2: the system of claim 1, further comprising an exhaust gas source for supplying a total exhaust gas composed of the first portion of exhaust gas and the second portion of exhaust gas, wherein the weight or volume percentage of the first portion of exhaust gas in the total exhaust gas is in the range of 10% to 90%, and the weight or volume percentage of the second portion of exhaust gas in the total exhaust gas is in the range of 90% to 10%, respectively.

The present disclosure also provides technical scheme 3: the system of claim 1, wherein the regenerative thermal oxidizer comprises an oxidation chamber and a straight exhaust conduit fluidly connected to the oxidation chamber, wherein the oxidation chamber is configured to oxidatively decompose organic matter in the first portion of exhaust gas to form the hot exhaust gas and deliver the predetermined flow of the hot exhaust gas to the mixing module via the straight exhaust conduit.

The present disclosure also provides technical scheme 4: the system of claim 3, wherein the flow ratio of the predetermined flow of hot exhaust gas to the second portion of exhaust gas in the mixing module is in the range of 1:1 to 15: 1.

The present disclosure also provides technical scheme 5: the system of claim 1, wherein the first portion of the exhaust gas and/or the second portion of the exhaust gas comprises a combustible gas having volatile organics, the combustible gas having an energy value of 100kJ/Nm³To 1000kJ/Nm³Within the range of (1).

The present disclosure also provides technical scheme 6: the system of claim 5, wherein the first portion of exhaust gas and/or the second portion of exhaust gas comprises a mixture having an energy value of 100kJ/Nm3, 500kJ/Nm³Or 1000kJ/Nm³The combustible gas of (1).

The present disclosure also provides technical scheme 7: the system of claim 1, further comprising at least one mixer external to the regenerative oxidizer and at least one dilution air supply for supplying dilution air to enable the first portion of the exhaust gas and/or the second portion of the exhaust gas to obtain oxygen sufficient to oxidatively decompose organic matter therein, the at least one mixer for mixing the first portion of the exhaust gas and/or the second portion of the exhaust gas with dilution air prior to being supplied to the regenerative oxidizer and/or the mixing module.

The present disclosure also provides technical scheme 8: the system of claim 1, further comprising a plurality of injectors, the mixing modules each comprising a plurality of mixing sections, wherein the plurality of injectors are spaced apart along the airflow direction in the mixing module corresponding to the plurality of mixing sections and are configured to inject a second portion of the exhaust gas in the corresponding mixing section of the mixing module.

The present disclosure also provides technical scheme 9: the system of claim 8, further comprising a plurality of mixer groups disposed therein transverse to the direction of gas flow across the mixing module and each disposed correspondingly downstream of the plurality of injectors for enhancing mixing between the second portion of exhaust gas and the predetermined flow of hot exhaust gas.

The present disclosure also provides technical solution 10: the system according to claim 1 or 8, wherein the mixing module is in a temperature range of 600 ℃ to 1200 ℃ when the organic matter in the second portion of exhaust gas undergoes oxidative decomposition therein, and the passage of the second portion of exhaust gas through the mixing module takes in a time in a range of 0.5 seconds to 2 seconds, so as to form an exhaustible off-gas at the outlet of the mixing module.

The present disclosure also provides technical scheme 11: the system of claim 10, further comprising a heat recovery module disposed downstream of the mixing module, the heat recovery module configured to receive the dischargeable tail gas from the mixing module and recover thermal energy therein to form a heated fluid.

The present disclosure also provides technical solution 12: the system of claim 11, wherein a gas-to-fluid heat exchanger is further disposed in the bypass diversion module and configured to receive and absorb heat from at least one of the dischargeable tail gas from the mixing module, the dischargeable tail gas from the heat recovery module, or the heating fluid from the heat recovery module to preheat the second portion of the exhaust gas.

The present disclosure also provides technical scheme 13: the system of claim 1, wherein the mixing module is configured as a mixing conduit or a mixing chamber.

In another aspect of the present disclosure, there is also disclosed an exhaust gas treatment method, including: providing a regenerative oxidation device; leading the first part of waste gas into a heat accumulating type oxidation device for oxidation treatment to form hot tail gas and conveying the hot tail gas with preset flow rate out of the heat accumulating type oxidation device; and directing a second portion of the exhaust gas to bypass the regenerative oxidation device and mix with the predetermined flow of hot exhaust gas from the regenerative oxidation device downstream of the regenerative oxidation device such that the second portion of the exhaust gas absorbs heat from the predetermined flow of hot exhaust gas sufficient to oxidatively decompose organic matter in the second portion of the exhaust gas.

Another aspect of the present disclosure described above relating to "an exhaust gas treatment method" may be embodied as claim 14.

The present disclosure also provides technical scheme 15: the method of claim 14, further comprising introducing a total exhaust gas from the exhaust gas source and splitting it into the first portion of exhaust gas and the second portion of exhaust gas, wherein the first portion of exhaust gas is in a range of 10% to 90% by weight or volume of the total exhaust gas, and the second portion of exhaust gas is in a range of 90% to 10% by weight or volume of the total exhaust gas, respectively.

The present disclosure also provides technical solution 16: the method of claim 14, wherein the regenerative thermal oxidizer further comprises an oxidation chamber and an inline conduit fluidly connected to the oxidation chamber, the oxidation chamber is configured to oxidatively decompose organic matter in the first portion of exhaust gas to form the hot exhaust gas and to deliver the preset flow rate of the hot exhaust gas to the outside of the regenerative thermal oxidizer via the inline conduit to mix with the second portion of exhaust gas, wherein the first portion of exhaust gas and/or the second portion of exhaust gas comprises combustible gas with volatile organic matter.

The present disclosure also provides technical scheme 17: the method of claim 14 or 16, wherein the predetermined flow rate of the hot exhaust gas is mixed with the second portion of the exhaust gas downstream of the regenerative oxidizer at a flow rate ratio in a range of 1:1 to 15: 1.

The present disclosure also provides technical solution 18: the method according to claim 14, further comprising: supplying dilution air to the first portion of the off-gas and/or the second portion of the off-gas outside the regenerative thermal oxidizer to enable the first portion of the off-gas and/or the second portion of the off-gas to obtain oxygen sufficient to oxidatively decompose organic matter therein; and mixing the first portion of exhaust gas and/or the second portion of exhaust gas with corresponding dilution air prior to supply to the regenerative oxidizer and/or prior to mixing with the predetermined flow of hot tail gas.

The present disclosure also provides technical solution 19: the method of claim 14, further comprising providing a mixing module and a plurality of injectors, wherein the mixing module is configured to mix the second portion of exhaust gas and the predetermined flow of hot exhaust gas and includes a plurality of mixing sections, and wherein the plurality of injectors are spaced apart in the mixing module along the direction of gas flow corresponding to the plurality of mixing sections and configured to inject the second portion of exhaust gas in the corresponding mixing sections of the mixing module.

The present disclosure also provides technical solution 20: the method of claim 19, further comprising providing a plurality of mixer sets arranged transverse to the direction of gas flow across the mixing module, wherein each of the plurality of mixer sets is correspondingly disposed downstream of the plurality of injectors for enhancing mixing between the second portion of exhaust gas and the predetermined flow of hot exhaust gas.

The present disclosure also provides technical scheme 21: the method according to claim 19, wherein the temperature in the mixing module is maintained in the range of 600 ℃ to 1200 ℃ when the organic matter in the second portion of exhaust gas undergoes oxidative decomposition in the mixing module, the passage of the second portion of exhaust gas through the mixing module taking in the range of 0.5 seconds to 2 seconds, so as to form an exhaustible off-gas at the outlet of the mixing module.

The present disclosure also provides technical solution 22: the method according to claim 21, further providing a gas-fluid heat exchanger and/or a heat recovery module to recover heat energy from the formed dischargeable tail gas for preheating the second portion of exhaust gas and/or forming a heating fluid.

Other features and advantages of the present invention will become apparent from the following more detailed description of the preferred embodiment, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the invention.

Drawings

The features and advantages of various embodiments of the present disclosure will become apparent from the following more detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of these embodiments of the disclosure.

FIG. 1 is a schematic diagram of an exhaust treatment system according to the prior art.

FIG. 2 is a schematic illustration of an exhaust treatment system according to an embodiment of the present disclosure.

FIG. 3 is a schematic illustration of an exhaust treatment system according to an embodiment of the present disclosure.

FIG. 4 is a schematic illustration of an exhaust treatment system according to an embodiment of the present disclosure.

FIG. 5 is a schematic flow diagram of an exhaust treatment method according to an embodiment of the disclosure.

Detailed Description

Reference will now be made in detail to present embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. The same or similar reference numbers are used in the drawings and the description to refer to the same or similar parts of the invention.

As used in this disclosure, the terms "first," "second," and "third" are used interchangeably to distinguish one element from another, and are not intended to denote the position or importance of the individual elements. The terms "upstream" and "downstream" refer to relative directions with respect to fluid flow in a fluid path. For example, "upstream" refers to the direction from which the fluid flows out, while "downstream" refers to the direction to which the fluid flows. The terms "axial" or "axially" refer to relative directions that are substantially parallel and/or coaxially aligned with an axial centerline of a particular component. The modifier "about" or "approximately" used in connection with a quantity is inclusive of the stated value and has the meaning dictated by the context (e.g., includes the error associated with measurement of the particular quantity). It will also be clear that equivalent values relating to errors may be expressed without the use of "about" or "about", and "about" or "about" may not be used.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this disclosure, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is noted and noted that the term "organic waste gas" in the present disclosure refers to waste gas containing organic matter, more specifically "waste gas containing a minor proportion (e.g., about 1% by volume or 2% by weight, etc.) of organic matter (e.g., VOCs or VOCs)", which may also be referred to as "waste gas" or "the first portion of waste gas" or "the second portion of waste gas", respectively. The above-mentioned terms such as "the organic off-gas" and the like do not mean "the off-gas is an organic gas".

FIG. 1 shows a schematic diagram of a prior art exhaust treatment system. As shown in fig. 1, a prior art exhaust gas treatment system includes an RTO apparatus 1, wherein the RTO apparatus 1 generally includes an intake manifold 10, an oxidation chamber (or combustion chamber) 11, an exhaust manifold 12, a plurality of regenerative heat recovery chambers 13, a straight exhaust duct 14, a heat recovery module or boiler 15, a stack 16, and an associated plurality of control valves. In the prior art shown in fig. 1, substantially all of the organic waste gas a to be treated, which contains VOC, is introduced into the oxidation chamber 11 via the intake manifold 10 to be subjected to oxidation treatment. A straight exhaust duct 14 is fluidly connected to the straight exhaust outlet 110 of the oxidation chamber 11 to lead out hot off-gas having a temperature range of 800 to 1000 ℃ as a superheated gas stream. Each of the plurality of regenerative heat recovery chambers 130, 132, 134 includes at least one regenerative/exothermic module, such as at least one bed of ceramic material or the like, fluidly connected to the intake manifold 10 and the exhaust manifold 12 and in heat exchange with the hot exhaust gas or the organic exhaust gas flowing through each heat recovery chamber.

To reduce the concentration of VOCs or to ensure that the oxidation chamber 11 contains sufficient oxygen to carry out the oxidation reaction, the entire organic waste gas is typically diluted at least once before it enters the RTO unit. As shown in fig. 1, a first portion of dilution air B1 may be provided by a first dilution air supply located outside the RTO unit to dilute the organic exhaust gas a, and a first mixer M1 may be disposed in the intake manifold 10 for mixing the organic exhaust gas a and the first portion of dilution air B1 prior to being supplied to the RTO unit 1.

For organic waste gases with a high VOC concentration, only one air dilution as shown in fig. 1 may cause the oxidation temperature in the oxidation chamber 11 to be too high, for example, more than about 1200 ℃, thereby generating harmful substances that cannot be directly discharged into the atmosphere. To avoid excessive temperatures in the oxidation chamber 11, e.g., above about 1200 ℃, alternative prior art exhaust treatment systems may employ multi-stage air dilution (not shown) that may be used in conjunction with corresponding multi-stage mixing devices to dilute and mix the organic exhaust gas with dilution air, e.g., to provide three or four stage air dilution and corresponding three to four stage mixing devices, but this results in a larger RTO volume and higher manufacturing and processing costs.

Various embodiments of the present disclosure provide exhaust treatment systems and methods to address many of the above-mentioned problems in the prior art. Embodiments of the present disclosure can effectively reduce exhaust gas treatment costs and improve energy utilization efficiency, and can also reduce the volume and reduce the cost of regenerative oxidation devices, compared to exhaust gas treatment systems and treatment methods that do not use one or more features of the present disclosure.

Referring to FIG. 2, an exemplary embodiment of an exhaust treatment system of the present disclosure is schematically illustrated. As shown in fig. 2, the exhaust gas treatment system 2 includes a regenerative thermal oxidation device or RTO device (also referred to as an RTO furnace) 1, a bypass diversion module 20, a mixing module 22, and an associated control module (not shown), and the RTO device 1 is configured to receive and process a first portion of the organic exhaust gas a1 to oxidatively decompose organic matter therein, thereby forming a hot exhaust gas in the RTO 1, and to deliver a predetermined flow of the hot exhaust gas out of the RTO device 1. The bypass diversion module 20 is configured to be connected in parallel with the RTO plant 1 and configured to receive and bypass the second portion of organic exhaust gas a2 around the RTO plant 1 into the mixing module 22, and in the mixing module 22 the second portion of organic exhaust gas a2 is mixed with a preset flow of hot exhaust gas from the RTO plant 1; the predetermined flow rate of hot tail gas includes sufficient heat to cause oxidative decomposition of organic matter, such as VOCs, in the second portion of organic waste gas a2, thereby collectively forming an exhaustible tail gas to exit the hybrid module 22 and be exhausted to the atmosphere or ambient environment via a downstream exhaust conduit 140 fluidly coupled downstream thereof. The various components of the exhaust treatment system 2 are described in greater detail below with continued reference to FIG. 2.

Similar to the RTO apparatus 1 of fig. 1, the RTO apparatus 1 of fig. 2 includes an intake manifold 10, an oxidation chamber (also referred to as a combustion chamber) 11, an exhaust manifold 12 and a plurality of regenerative heat recovery chambers 13, a straight exhaust pipe (or upstream exhaust pipe) 14, a heat recovery apparatus 15 and a stack 16, an associated plurality of control valves and a corresponding RTO control unit (not shown, which may belong to a functional module of the above control module, and may also be a commercially available RTO controller). The inlet manifold 10 is used for introducing a first part of organic waste gas A1 into the oxidation chamber 11 for oxidation treatment, and the outlet manifold 12 is used for discharging dischargeable hot tail gas obtained from the oxidation treatment out of the RTO device 1 after being subjected to heat storage and cooling by a heat storage type heat recovery chamber 13.

Each of the plurality of regenerative heat recovery chambers 13 includes one or more regenerative/exothermic modules fluidly connected to the intake manifold 10 and the exhaust manifold 12, and the regenerative/exothermic modules may accumulate recovered thermal energy in a previous cycle and heat the first portion of organic exhaust gas a1 passing therethrough in a current cycle, so that the first portion of organic exhaust gas a1 is heated by the previously recovered thermal energy to a temperature at which organic matter such as VOC is suitable for an oxidative decomposition reaction in the oxidation chamber 11 downstream of the regenerative/exothermic modules, for example, about 800 to 1000 ℃. The heat accumulation/release module can be heated in the next cycle by hot exhaust gas flowing through the heat accumulation/release module after the heat release cooling of the current cycle. In this and alternative embodiments, each thermal storage/release module may comprise at least one ceramic thermal storage device or ceramic thermal storage bed, wherein the corresponding ceramic structure may be a monolithic structure such as honeycomb ceramic or a random structure such as saddles (saddles) or Raschig Rings (Raschig Rings). For example, the corresponding ceramic material is alumina, cordierite or the like.

The embodiment of fig. 2 schematically shows that the RTO apparatus 1 comprises three regenerative heat recovery chambers 130, 132 and 134. In this embodiment and alternative embodiments, the plurality of regenerative heat recovery chambers 13 may include two to five or more regenerative heat recovery chambers, and the specific number thereof may be designed and adjusted according to the amount of the organic waste gas to be treated and the type and concentration of the organic substances therein.

With continued reference to fig. 2, an off-gas source, such as an organic off-gas source S, which is an associated manufacturing facility that produces an organic off-gas comprising VOCs and the like (or a total organic off-gas), which may be, for example, an industrial tail gas from an associated manufacturing facility, provides a total organic off-gas a, which may include a total organic off-gas a having an energy value at about 100kJ/Nm and a corresponding first or second portion of the organic off-gas³To about 1000kJ/Nm³The energy value of the combustible gas in the range, more specifically the combustible gas comprised by the total organic waste gas a and the corresponding first or second portion of organic waste gas, may specifically be about 100kJ/Nm³About 500kJ/Nm³Or about 1000kJ/Nm³Etc., the combustible gas may include volatile organic compounds, VOCs, etc. The total organic waste gas a may be a VOC-containing organic waste gas that is substantially uniform and has a substantially constant energy value in a short period of time, but its energy value may fluctuate with process variations in a long-term view. The total organic exhaust gas A is branched into a first part A1 and a second part AA gas a2, the weight or volume percentage of the first portion of organic waste gas a1 in the total organic waste gas a being in the range of about 10% to 90%, and the weight or volume percentage of the second portion of organic waste gas a2 in the total organic waste gas a being in the range of about 90% to 10%, respectively. That is, the total organic offgas a includes a first portion of organic offgas a1 having a weight or volume percentage of about 10% to 90%, and a second portion of organic offgas a2 having a weight or volume percentage of about 90% to 10%, respectively, and the flow rates of the first portion of organic offgas a1 and the second portion of organic offgas a2, or the ratio of the two, may be adjusted by corresponding valves. In an alternative embodiment, the total organic offgas a may comprise about 10% to 40% by weight or about 15% to 25% by volume of the first portion of organic offgas a1 and about 90% to 60% by weight or about 85% to 75% by weight or volume of the second portion of organic offgas a2, respectively. It will be appreciated that the higher the VOC concentration in the total organic waste gas, the greater the relative or absolute flow or ratio of the first portion of organic waste gas a 1.

With continued reference to fig. 2, the first portion of organic exhaust gas a1 may be diluted by a first portion of dilution air B1 provided by a first dilution air supply external to the RTO plant, such as a suction fan or the like that draws air from the ambient environment or atmosphere, a first mixer M1 may be disposed on the intake manifold 10 downstream of the organic exhaust gas source S for mixing the first portion of organic exhaust gas a1 and the first portion of dilution air B1 prior to being supplied to the RTO plant 1, and a first mixer M1 may be a rotary mixer or a static mixer or the like.

As shown in fig. 2, the intake manifold 10 may be fluidly connected downstream of the first mixer M1 for receiving the diluted first portion of organic exhaust gas a1 mixed by the first mixer M1. A purge manifold P for receiving or collecting purge (post) gases from the RTO apparatus may be fluidly connected to the intake manifold 10 (as shown in fig. 3 and 4) or the first mixer M1. Each regenerative heat recovery chamber 13 is fluidly connected to the intake manifold 11 through an intake manifold 100 to receive a diluted first portion of organic exhaust gas a1 therefrom. Each regenerative heat recovery chamber 13 is also fluidly connected to the exhaust manifold 12 through a corresponding exhaust branch pipe 120 to discharge the cooled dischargeable exhaust gas to the exhaust manifold 12. Each regenerative heat recovery chamber 13 is also connected to a purge manifold P through a purge branch pipe P1 to deliver purge gas from the RTO apparatus 1 to the intake manifold 10 when purging is required. The intake manifold 10, the exhaust manifold 12 and the purge manifold P are respectively provided with control valves, and the control module or the RTO control unit generates control signals according to corresponding processes to control the opening and closing of the corresponding valves, so that the corresponding control functions can be realized by directly setting, improving or adjusting the control signals on the commercially available control module or the RTO control unit.

With continued reference to fig. 2, the oxidation chamber 11 may be configured to oxidatively decompose the organic substances in the first portion of the organic waste gas a1, thereby forming a hot tail gas therein. The temperature of the oxidation chamber 11 is controlled in a range of about 800 to 1000 c to ensure complete oxidative decomposition of organic matters such as VOC therein while also avoiding generation of harmful substances. An external booster burner 17 (see fig. 3 and 4) is optionally used to provide hot gas when the temperature in the oxidation chamber 11 is too low. The oxidation chamber 11 has a straight exhaust outlet 110 and discharges a predetermined flow rate of the hot off-gas through a straight exhaust duct 14 fluidly connected to the straight exhaust outlet 110 or directly out of the oxidation chamber 11.

It will be appreciated that, in general, to maintain stable operation of the RTO plant, the amount of hot exhaust gases exiting the oxidation chamber 11 via the straight exhaust duct 14 is no more than 25% of the total amount of hot exhaust gases contemporaneously generated in the oxidation chamber 11, but as technology evolves, the amount of hot exhaust gases directed out via the straight exhaust duct 14 may increase.

Optionally, the exhaust gas treatment system 2 further comprises a second mixer M2 located outside the RTO unit 1 and a second dilution air supply, the second mixer M2 may be disposed on the bypass split module 20, such as a bypass duct, the second dilution air supply being configured to supply a second portion of dilution air B2 to dilute the second portion of organic exhaust gas a2, the second mixer M2 being configured to receive and mix a second portion of organic exhaust gas a2 and a second portion of dilution air B2 prior to being supplied to the mixing module 22. The amount of the second portion of dilution air B2 is controllable and adjustable, which may be determined based on ensuring that sufficient oxygen is provided to the second portion of organic exhaust gas A2 to completely oxidatively decompose the oxides therein. Similarly, the second dilution air supply may be, for example, a suction fan or the like that draws air from the ambient environment or atmosphere, and the second mixer M2 may be a rotary mixer or a static mixer or the like.

With continued reference to fig. 2, the bypass diversion module 20 is configured to be connected in parallel with the RTO apparatus 1 and configured to receive a second portion of the organic exhaust gas a2 diverted from the total organic exhaust gas a. The bypass and diversion module 20 is also provided with a flow regulating device or valve or the second mixer M2 as described above, and the control module controls the flow or opens or closes the corresponding valve according to the input of the user through the man-machine interface. The bypass diversion module 20 causes a second portion of the organic exhaust gas a2 to bypass the RTO unit 1 and be delivered to the mixing module 22. Specifically, a diluted or undiluted second portion of organic waste gas a2 may be fed into the mixing module 22 through three staged flow paths 200 as shown in fig. 2 or other number of passages.

The mixing module 22 is disposed downstream of the regenerative oxidizer 1 for receiving the predetermined flow rate of the hot exhaust gas from or directly from the oxidation chamber 11 and receiving the diluted or undiluted second portion of the organic exhaust gas a2 from the bypass flow-dividing module 20. In this embodiment or an alternative embodiment, in the mixing module 22, the flow ratio of the preset flow rate of the hot exhaust gas flowing into the mixing module 22 through the straight exhaust pipe 14 to the second portion of the organic exhaust gas a2 entering the mixing module 22 is in the range of about 1:1 to 15:1, which can be comprehensively calculated and determined according to the concentration or content of VOC in the organic exhaust gas and the processing capacity and the operating characteristics of the RTO plant, as long as it can be ensured that the dischargeable exhaust gas flowing from the mixing module 22 into the downstream exhaust pipe 140 reaches the state-or region-specified emission standard, in particular, the VOC-related emission standard.

The second portion a2 absorbs heat from the predetermined flow of hot exhaust gas from the oxidation chamber 11 in the mixing module 22 sufficient to oxidatively decompose organic matter therein, such as VOCs, to form a dischargeable exhaust gas at the outlet of the mixing module 22. The temperature of the mixing module 22 when the organic matter such as VOC in the second portion of organic exhaust gas a2 undergoes oxidative decomposition therein is in the range of about 600 ℃ to 1200 ℃, and the passage of the second portion of organic exhaust gas a2 from the entrance to the exit of the mixing module 22, i.e., through the mixing module 22, takes in the range of about 0.5 seconds to 2 seconds. In this or other embodiments, the temperature of the organic matter, such as VOC, in the second portion of organic exhaust gas a2 by the mixing module 22 may be in the range of about 700 ℃ to 1100 ℃, more particularly around 850 ℃, when the organic matter is oxidatively decomposed therein, and the passage of the second portion of organic exhaust gas a2 through the mixing module 22 may take about 1 second.

The mixing module 22 may be a mixing pipe or a mixing chamber, etc. In the present embodiment, the mixing module 22 is a mixing duct 22, and the corresponding mixing duct 22 may be the same type of duct as the inline duct 14 or the downstream exhaust duct 140. However, to enhance mixing, the interior of the mixing conduit 22 may be provided with a structure including protrusions, depressions, or combinations thereof, or a venturi configuration, etc. to enhance mixing, and the mixing conduit 22 may also have a different inner diameter, outer diameter, and/or cross-sectional shape, etc. than the straight exhaust conduit 14.

In the exemplary embodiment, treatment system 2 also includes a heat recovery module 15 disposed downstream from mixing module 22, where heat recovery module 15 may be a heat recovery boiler or the like disposed in a downstream exhaust conduit 140 for receiving the dischargeable tail gas from mixing module 22 and recovering thermal energy therefrom to form a heating fluid, such as steam or the like. The dischargeable tail gas flows into a chimney 16 at the end of the downstream exhaust duct 140, and may be merged with the dischargeable tail gas from the RTO apparatus 1 via the exhaust manifold 12, which is cooled by the regenerative heat recovery chambers 13, in the chimney 16, or may be further subjected to other treatments such as smoke removal and dust removal, and then discharged to the atmosphere or the surrounding environment.

Referring to FIG. 3, another embodiment of an exhaust treatment system of the present disclosure is schematically illustrated. As shown in fig. 3, the exhaust gas treatment system 3 includes a regenerative thermal oxidation device or RTO device 1, a bypass flow-dividing module 30, a mixing module 32, a plurality of related control valves and corresponding control modules (not shown), wherein the structure of the RTO device 1 is substantially the same as that in fig. 1 and 2, and for simplifying the description, the structure and the operation process of the RTO device 1 are not repeated, and can be understood by referring to the above description. Unlike the mixing module 22 shown in fig. 2, which is configured as a mixing conduit 22, the mixing module 32 in fig. 3 is configured as a mixing chamber 32 that may be more complex in structure and shape, and the mixing chamber 32 may include a plurality of mixing sections and at least one reaction section. As shown in fig. 3, the mixing chamber 32 includes three mixing sections 320, 322, 324 and two reaction sections 321 and 323, wherein the reaction section 321 is fluidly connected between the mixing sections 320 and 322, and the reaction section 323 is fluidly connected between the mixing sections 322 and 324. A plurality of injectors are disposed in the mixing chamber 32 in fluid communication with the plurality of staging flow paths 300 of the bypass diverter module 30, for example, as shown in fig. 3, three injectors 340, 342, 344 are connected to the corresponding three staging flow paths 300, and a plurality of injectors 340, 342, 344 are disposed in the mixing module at corresponding intervals along the airflow direction C1 in the plurality of mixing sections 320, 324, 326 and are configured to inject a second portion of the organic exhaust gas in the corresponding mixing section of the mixing chamber 32.

As shown in fig. 3, a plurality of mixer sets, e.g., three mixer sets 360, 362, 364, may be arranged across the mixing module 32 in a direction perpendicular to the airflow direction C1. The plurality of mixer banks 360, 362, 364 are each disposed downstream of the plurality of injectors 340, 342, 344, respectively, for enhancing mixing between the second portion of organic exhaust gas and the predetermined flow of hot exhaust gas. For example, three mixer banks 360, 362, 364 are provided downstream of the three injectors 340, 342, 344, respectively.

Similar to the mixing module 22 in fig. 2, the mixing module or mixing chamber 32 is in the range of about 600 to 1200 ℃ when the organic matter such as VOC in the second portion of organic exhaust gas a2 undergoes oxidative decomposition therein, and the time taken for the second portion of organic exhaust gas a2 to pass through the mixing module 32 is also in the range of about 0.5 to 2 seconds. In this embodiment or other embodiments, the organic matters such as VOC in the second portion of the organic waste gas a2 of the mixing module 32 may be in the range of about 700 ℃ to 1100 ℃ when undergoing oxidative decomposition therein, and in more detail, the temperature in the two reaction sections 321 and 323 may be controlled to be maintained at not lower than about 800 ℃, for example, at about 850 ℃, and the time taken for the second portion of the organic waste gas a2 to pass through the mixing module 32 may be about 1 second.

FIG. 4 illustrates a schematic diagram of yet another embodiment of an exhaust treatment system of the present disclosure. Most components in the further embodiment shown in fig. 4 are substantially the same as or similar to corresponding components in the further embodiment shown in fig. 3, and for simplifying the description, the components that are substantially the same as or similar to those in the two embodiments are not repeated, so please refer to the above description and the further embodiment of fig. 3 to understand the further embodiment in fig. 4.

The two embodiments of fig. 4 and 3 differ substantially in that the further embodiment of the exhaust gas treatment system 3 shown in fig. 4 further comprises a gas-to-fluid heat exchanger 38 disposed in the bypass diversion module 30, and the gas-to-fluid heat exchanger 38 may comprise a pre-heat passage (not shown) fluidly connected in the bypass diversion module 30 for receiving and pre-heating the second portion of the organic exhaust gas a2 flowing to the mixing module 32, and a heat absorption passage (not shown) fluidly connectable to the downstream exhaust duct 140. The gas-fluid heat exchanger 38 may comprise a gas-gas heat exchanger, a gas-steam heat exchanger, or the like, and the heat absorption path of the gas-fluid heat exchanger 38 may receive the exhaustible tail gas directly from the mixing module 32, or the exhaustible tail gas directly from the heat recovery module 15 after absorbing heat therefrom, or the heating fluid (e.g., water vapor, or the like) directly from the heat recovery module 15, and absorb heat therefrom. The preheating of the second portion of organic waste gas a2 by the gas-fluid heat exchanger 38 can further improve the energy utilization efficiency, and make the second portion of organic waste gas a2 obtain additional heat to ensure more thorough oxidative decomposition of organic substances such as VOC in the mixing module 32.

In the embodiment shown in fig. 4, the heat absorption path of the gas-to-fluid heat exchanger 38 may be disposed in direct fluid communication in the downstream exhaust conduit 140 and downstream of the heat recovery module 15. In an alternative embodiment, the gas-fluid heat exchanger 38 may be disposed in the downstream exhaust conduit 140 upstream of the heat recovery module 15.

It will be appreciated that both fig. 3 and 4 show an optional booster burner 17 capable of providing supplemental hot gas, disposed externally to the RTO arrangement. The control module generates supplementary control commands when the oxidation chamber 11 temperature is too low requiring supplementary hot gas, and the optional combustion-supporting burner 17 may receive the supplementary control commands and accordingly receive and combust the fuel supply F and the combustion air supply B3 to generate hot gas of the required temperature and the required flow rate, and may then feed the resulting hot gas into the oxidation chamber 11 to maintain the temperature therein at about 800 to 1000 ℃.

To further illustrate the structure, principle and efficacy of the exhaust gas treatment system 2 or 3 of the present invention, the process of treating organic exhaust gas will be described with reference to fig. 2 to 4, but not limited thereto; in the organic waste gas treatment, about 10% to 90% or about 10% to 40% or about 15% to 25% (volume or flow percentage) of the total organic waste gas a is first branched into the first part of organic waste gas a1, and the remaining part is branched into the second part of organic waste gas a2, and the first part of organic waste gas a1 and the second part of organic waste gas a2 are directed toward the RTO plant 1 and the bypass split module 22 or 32, respectively; the first portion of organic exhaust gas a1 can be mixed with the first portion of dilution air B1 provided by the first dilution air supply in the first mixer M1 to form a diluted first portion of organic exhaust gas a1, then flows through one of the regenerative heat recovery chambers 13 via the intake manifold 10 and absorbs the heat accumulated in the previous cycle, and the flow rate or amount is controlled by the control module such that the first portion of organic exhaust gas a1 passes through the oxidation chamber 11 in a time range of 0.5 seconds to 1 second; the first portion of the organic waste gas a1 may be introduced slightly earlier than the second portion of the organic waste gas a2, and preferably, the second portion of the organic waste gas a2 is just flowed into the mixing module 22 or 32 to be mixed with the predetermined flow rate of the hot tail gas when the first portion of the organic waste gas a1 is completely oxidized in the oxidation chamber 11 of the RTO apparatus and the predetermined flow rate of the hot tail gas is provided through the straight line pipe 14; the second portion of organic exhaust gas a2 may or may not be diluted by a second portion of dilution air B2 and a second mixer M2, the second portion of organic exhaust gas a2 being mixed with the predetermined flow of hot exhaust gas in the mixing module 22 or 32 at a flow ratio of about 1:1 to about 15:1 for a period of about 1 second and absorbing heat therefrom and oxidatively decomposing organic matter such as VOCs therein, and forming an exhaustible exhaust gas at an outlet (not shown) of the mixing module 22 or 32 and passing into the downstream exhaust duct 140, the exhaustible exhaust gas having a temperature of up to 600 ℃; in order to recycle the heat energy therein, the dischargeable tail gas may flow through the heat recovery module 15 only, or may flow through the gas-fluid heat exchanger 38 after flowing through the heat recovery module 15 first, or vice versa; such that a second portion of the organic exhaust gas a2 is preheated as it flows through the bypass diversion module 30 and through the gas-to-fluid heat exchanger 38; after the heat energy in the exhaust gas is recycled, the exhaust gas may flow into the chimney 16 at the end of the downstream exhaust pipe 140, and join with the exhaust gas which is exhausted from the exhaust manifold 12, flows through the oxidation chamber 11, and is cooled by absorbing heat in any one of the regenerative heat recovery chambers 13 or 23, in the chimney 16, and then leave the chimney 16 to be discharged to the surrounding environment.

Referring to fig. 5, in conjunction with fig. 2-4, fig. 5 shows a schematic flow diagram of an embodiment of a method 50 for exhaust treatment in an embodiment of the present disclosure, where method 50 may be performed by an exhaust treatment system as shown in fig. 2-4 or other similar systems. As shown in fig. 5, the method 50 begins with step S52 of providing a regenerative oxidizer including an oxidation chamber. The detailed structure of the regenerative thermal oxidizer provided in step S52 can be seen from the regenerative thermal oxidizer or RTO apparatus 1 shown in fig. 2 to 4, which includes an intake manifold 10, an oxidation chamber 11, an exhaust manifold 12, a plurality of regenerative heat recovery chambers 13, and an inline duct 14 directly connected to the oxidation chamber 11.

Method 50 further includes a step S54 of introducing a total organic waste gas from the organic waste gas source and splitting it into a first portion of organic waste gas and a second portion of organic waste gas, wherein the first portion of organic waste gas and the second portion of organic waste gas are to be fed into the RTO device 1 and bypassed, respectively, the RTO device 1 in a subsequent step; wherein the total organic waste gas comprises about 10% to 90% by weight or volume of the first portion of organic waste gas and about 90% to 10% by weight or volume of the second portion of organic waste gas. In this and alternative embodiments, the total organic waste gas may include a first portion of organic waste gas in a weight or volume percent of about 10% to 40%, or about 15% to 25%, and a second portion of organic waste gas in a weight or volume percent of about 90% to 60%, or about 85% to 75%. It should be understood that the percentage content of the first portion of organic waste gas to the second portion of organic waste gas can be adjusted accordingly according to the energy value of the combustible gas it comprises or the VOC concentration therein or the characteristics of the RTO plant, etc.

The method 50 further includes step S56, delivering the first portion of organic waste gas to a regenerative oxidation device for oxidation treatment. In step S56, a first portion of the organic waste gas enters the RTO apparatus 1 through the intake manifold 10 shown in fig. 2 to 4, and is heated by any of the regenerative heat recovery chambers 13 with the heat or thermal energy recovered in the previous cycle, and then enters the oxidation chamber 11 for oxidation treatment.

It should be noted that before the step S56, the method 50 may further include the step of diluting the first portion of the organic waste gas a1 by using the first portion of the dilution air B1 and the first mixer M1 shown in fig. 2 to 4, so that the first portion of the organic waste gas a1 obtains enough oxygen from the first portion of the dilution air B1 to sufficiently oxidize and decompose the organic substances such as VOCs therein in the step S56. The first portion of organic waste gas a1 may or may not be diluted if it has sufficient oxygen.

With continued reference to fig. 5, the method 50 further includes step S58, performing oxidative decomposition on the organic matters in the first portion of the organic waste gas in the oxidation chamber to form a hot tail gas, and delivering a preset flow rate of the hot tail gas to the outside of the oxidation chamber. In step S58, the preset flow rate of hot exhaust gas is delivered out of the oxidation chamber through the straight exhaust duct 14 fluidly connected to the straight exhaust outlet 110 of the oxidation chamber 11 as shown in fig. 2-4.

The method 50 further includes step S60, directing the second portion of the organic exhaust gas to bypass the regenerative oxidation device and mix with a predetermined flow of hot exhaust gas from the oxidation chamber downstream of the regenerative oxidation device. In step S60, the predetermined flow rate of the hot exhaust gas and the second portion of the organic exhaust gas are mixed at a flow rate ratio ranging from about 1:1 to about 15:1 downstream of the regenerative thermal oxidizer, and specifically in the mixing module 22 or 32 shown in fig. 2-4.

It should be noted that before the step S60, the method 50 may further include providing a mixing module 22, shown in fig. 2 as a mixing pipeline, for mixing the second portion of the organic waste gas and the predetermined flow rate of the hot tail gas in the step S60; prior to step S60, method 50 may also include providing a mixing chamber 32 as shown in fig. 3 and 4 including a plurality of mixing sections 320, 322, 324, and providing a plurality of injectors 34 and a plurality of mixer groups 36 disposed in spaced correspondence in the plurality of mixing sections 320, 322, 324 and in upstream and downstream correspondence in the gas flow direction; the second portion of organic exhaust gas is thus injected in the corresponding mixing section by means of a plurality of injectors 34 and the mixing between the second portion of organic exhaust gas and said preset flow of hot exhaust gas can be enhanced by means of a mixer group 36 downstream thereof, so as to maintain the temperature in the mixing module in the range of about 600 ℃ to 1200 ℃.

Optionally, before performing step S60, the method 50 may further include diluting the second portion of the organic waste gas using a second mixer M2 and a second portion of dilution air B2 shown in fig. 2-4, such that the second portion of organic waste gas a2 may obtain oxygen therefrom sufficient to oxidatively decompose oxides therein. The second portion of organic offgas a2 may not be diluted if it contains sufficient oxygen.

The method 50 further includes a step S62 of absorbing heat from the second portion of the organic waste gas from the predetermined flow rate of the hot tail gas, the heat being sufficient to oxidatively decompose organic matter in the second portion of the organic waste gas, so as to form an exhaustible tail gas.

The method 50 may also optionally include a step S64 of recycling heat energy in the formed dischargeable tail gas. In step S64, the second portion of organic exhaust gas may be preheated or a heating fluid may be formed by disposing the gas-fluid heat exchanger 38 and the heat recovery module 15 in the downstream exhaust duct 140 through which the dischargeable exhaust gas flows, without being limited to being disposed in series as in fig. 4, thereby recovering heat or thermal energy from the formed dischargeable exhaust gas.

The method 50 further includes, after the optional step S64, a step S66 of discharging the dischargeable tail gas into the ambient environment.

The various embodiments of the present disclosure utilize the bypass flow-dividing module connected in parallel with the regenerative thermal oxidation device, so that not all of the organic waste gas is sent to the RTO device for treatment, but part of the organic waste gas bypasses the RTO device and is sent to the downstream of the RTO device, and is mixed with the hot tail gas from the oxidation chamber of the RTO device downstream of the RTO device, so that the heat of the hot tail gas directly coming from the oxidation chamber can be fully utilized to make the VOC in the organic waste gas bypassing the RTO device be oxidized and decomposed. Compared with the bypass shunting module which is not used, the waste gas treatment cost can be effectively reduced, the energy utilization efficiency is improved, the size and the cost of the RTO equipment can be reduced, and the burden of the RTO equipment can be reduced.

This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.