阅读说明：本技术 一种废弃物层状燃烧装置及其模拟废弃物移动床燃烧方法 (Layered combustion device for wastes and method for simulating combustion of wastes in moving bed ) 是由 李清海 张衍国 丛堃林 杨潇潇 于 2020-12-16 设计创作，主要内容包括：本发明公开了一种废弃物层状燃烧装置及其模拟废弃物移动床燃烧方法。装置包括空气源、氧气源、流量控制器组、控制系统、风室组、炉排、炉膛和设置在炉膛的可替换式炉拱副。炉拱副包括可拆卸前拱和可拆卸后拱,能够在炉膛中形成喉口以及顺流、逆流或混合流的烟气流向。设定炉排废弃物虚拟移动速度为v,计算获得t时刻任一第i风室的即时时移风量曲线为q-i＝f(y-i+vt),并按此调节氧气流量控制器和空气流量控制器供风量和q-(i,air)之和为q-i,且与q-(i,air)的比例根据过量空气系数和所需的床层氧浓度进行调节,通过该比例调节可以调整总供氧量以及局部氧浓度。本发明具有简化研究过程等优点。(The invention discloses a layered combustion device for wastes and a method for simulating the combustion of the wastes by a moving bed. The device comprises an air source, an oxygen source, a flow controller group, a control system, an air chamber group, a fire grate, a hearth and a replaceable furnace arch pair arranged in the hearth. The furnace arch pair comprises a detachable front arch and a detachable rear arch, and can form a throat and a flue gas flow direction of concurrent flow, countercurrent flow or mixed flow in the hearth. Setting the virtual moving speed of the grate waste as v, and calculating to obtain an instant time-shifting air volume curve q of any ith air chamber at the time t i ＝f(y i + vt) and adjusting the oxygen flow controller and the air flow controller air supply rate in accordance therewith And q is i，air The sum of q i And is and and q is i，air The ratio of (a) is adjusted according to the excess air factor and the desired bed oxygen concentration, by means of which the total oxygen supply as well as the local oxygen concentration can be adjusted. The invention has the advantages of simplifying the research process and the like.)

1. The layered combustion device for the wastes is characterized by comprising an air source (2), an oxygen source (21), a flow controller group (1), a control system (20), an air chamber group (4), a fire grate (43), a hearth (56) and a replaceable furnace arch pair (48) arranged in the hearth (56), wherein a plurality of temperature measuring points are arranged on the wall surface of one side of the hearth (56), the temperature can be measured through a thermocouple group (27), and the thermocouple group (27) comprises a plurality of thermocouples; the furnace arch pair (48) comprises a detachable front arch (8) and a detachable rear arch (23), and a throat (54) can be formed in the hearth (56); the air chamber group (4) is arranged at the bottom of the fire grate (43), and the air chamber group (4) comprises a plurality of air chambers arranged along the length direction of the fire grate; the flow controller group (1) and the air chamber group (4) are arranged in a one-to-one corresponding mode, the flow controller group (1) comprises an air flow controller group and an oxygen flow controller group which are arranged in a one-to-one corresponding mode, the air flow controller group comprises a plurality of air flow controllers, and the oxygen flow controller group comprises a plurality of oxygen flow controllers; the air source (2) is connected with the air chambers of the air chamber group one by one through air pipelines, and each air pipeline is provided with an air flow controller; the oxygen source (21) is connected with the air chambers of the air chamber group one by one through oxygen pipelines, and each oxygen pipeline is provided with an oxygen flow controller; the thermocouple, the air flow controller and the oxygen flow controller are all connected with the control system (20) through signal wires.

2. A waste sheet combusting device as claimed in claim 1, wherein said plenum comprises n plenums and corresponding n air flow controllers and n oxygen flow controllers, where n is an integer greater than or equal to 2.

3. A layered waste combustion unit as defined in claim 1, characterized in that the furnace (56) comprises a front wall (7), a rear wall (42), a left side wall (45) and a right side wall (46), and cooling coils are arranged outside the front wall (7), the rear wall (42), the left side wall (45) and the right side wall (46).

4. The layered waste combustion device as set forth in claim 3, wherein the right wall (46) is provided with filler holes (30), flue gas sampling holes (22), pressure measuring points (51) and secondary air nozzles (26); the lower part of the front wall (7) is provided with a front ignition gun (5), and the lower part of the rear wall (42) is provided with a rear ignition gun (19).

5. A waste sheet combustion device as in claim 1, wherein the angle α of the side of said removable rear arch (23) is 50-80 °.

6. A method of simulating moving bed combustion of wastes using a layered combustion apparatus for wastes as claimed in any one of claims 1 to 5, comprising:

acquiring operation parameters of a moving bed to be simulated, wherein the parameters comprise a moving bed grate air volume curve function Q ═ f (x), and x is a moving bed waste real-time position; the length of the fire grate (43) is L, and the distance from the starting end of the ith air chamber to the starting end of the fire grate is y_iWherein 0 is less than or equal to y_i<Setting the virtual moving speed v of the waste on the grate (43) as L, i ═ 1,2, …, n, and calculating and obtaining the instant time-shift air volume curve q of the ith air chamber at the time t as q_i＝k₁f(y_i+ vt) where k₁Is a scaling factor and has (y)_iQ is 0 when + vt) is more than or equal to L;

selecting and installing a replaceable furnace arch pair (48) according to the expected flue gas flow direction, so that the flue gas flow direction in the hearth (56) is any one of forward flow, reverse flow or mixed flow;

uniformly laying the waste on the fire grate (43); the air supply is started through the control system (20) and the instant time shift air volume curve q of the ith air chamber is followed_i＝k₁f(y_i+ vt) adjusting the oxygen flow controller and the air flow controller so that the air supply rates through the oxygen source (21) and the air source (2) respectivelyAnd q is_i,airThe sum of q_iAnd is andand q is_i,airThe proportion of (a) is adjusted according to the excess air coefficient or the preset local oxygen concentration; igniting the waste to burn into gaseous products and solid residues, and acquiring and recording temperature signals from a thermocouple group (27) through a control system (20);

the control system (20) collects and records temperature signals from the thermocouple group (27), and simultaneously extracts smoke from the smoke sampling hole (22) for gas composition analysis to obtain combustion gas product information, wherein the gas composition comprises O₂、CO、NOx、SO₂、PAH；

Stopping air supply when t is equal to L/v, and finishing simulated combustion;

and after the hearth is cooled, sampling and analyzing the solid residues.

7. A method of simulating a moving bed combustion of waste according to claim 6, further comprising: and analyzing the local high temperature and the generation condition of the local high temperature according to the collected temperature signal, and modeling and analyzing by using the temperature signal and/or the gas product information.

Technical Field

The invention relates to a waste laminar combustion device and a waste moving bed combustion simulation method thereof, in particular to a fixed bed type waste laminar combustion device capable of simulating waste moving bed combustion and a method thereof, and belongs to the technical field of waste combustion.

Background

The garbage incineration becomes the mainstream process of the domestic garbage treatment in China, and as of 2017, China has built more than 350 garbage incineration facilities, the scale of the garbage incineration facilities is about 331000 tons/day, the per-capita incineration amount is about 67/person/year, and more than 9300 million tons of garbage are incinerated in a year, which accounts for 34.3% of the harmless treatment of the domestic garbage. In addition, the yield of the organic solid wastes in the Chinese industry is increased year by year, and the organic solid wastes have various types, are difficult to dispose and have serious potential environmental pollution, so that the solution is urgently needed. If the treatment capacity and the advantages of the waste incineration facility are fully exerted, and the waste incineration facility is utilized to cooperatively treat the industrial organic solid waste, the capacity of the incineration facility can be effectively utilized, the industrial organic solid waste can be treated, and the method not only has remarkable economic, environmental and social benefits, but also is an important means for realizing a waste-free city.

The ' environmental protection and prevention method for solid waste pollution of the people's republic of China ' revised in 2020 provides powerful legal support for classification of domestic waste and management of industrial organic solid waste, and the classified waste has obvious changes in components, yield and calorific value, especially has more increased calorific value. Any solid waste is combusted on a grate and is subjected to several stages of drying, pyrolysis, fixed carbon combustion in a bed layer, volatile matter combustion in a bed layer and a space, burnout and the like, which are common. But the classified garbage and the organic solid waste have great differences in the aspects of volatile components, fixed carbon, moisture, heat value and the like, so that the combustion process is quite different. Typical industrial organic solid waste has a high calorific value, and can cause the difference of combustion tissues in a furnace during synergistic incineration, so that the phenomenon of temperature runaway of local temperature runaway of a hearth smoke space or a grate layer is caused. "runaway temperature" is a sudden increase in the local temperature of a location that deviates significantly from the average temperature in the interval and will burn out the furnace or grate if not suppressed in time.

The classified municipal solid waste (dry waste or other waste) has relatively fixed yield, wherein the average content of each physical component is relatively stable, the yield of industrial organic solid waste single products is small, but the enrichment characteristic of the physical components is single, namely, after a certain kind of industrial solid waste is mixed and burnt, the enrichment of one or more pollution elements in the mixed fuel can be caused, so that the trace pollutants generated during the burning of the single waste are increased, and the pollutants are converted into the pollutants with the characteristic of synergistic burning.

The generation of NOx in the cooperative treatment process is closely related to the temperature and the atmosphere in the hearth, the generation amount of NOx is increased due to the oxygen-rich atmosphere and the high temperature in the furnace, the CO emission is used as a key index for efficient combustion, the offset is often caused with the generation of NOx, the CO emission is also an indirect measurement index of the generation amount of dioxin, how to control the furnace temperature and the atmosphere condition in the furnace, and balancing the initial generation of NOx and dioxin is the content of interest in the research of the project. Polycyclic aromatic hydrocarbons PAHs are also one of precursors for generating dioxin, heavy metals Cu and the like have strong catalytic capability on the generation of the dioxin, and sulfur-containing compounds have certain inhibition capability on the dioxin, so that possible mutual promotion or inhibition effects exist among different characteristic pollutants.

In order to research the combustion characteristics and the pollution emission characteristics of the separated classified garbage or the mixed combustion of the classified garbage and the industrial solid waste, an experimental device is needed to simulate and research the layered combustion process of the waste and the interaction influence process of pollutant generation in a laboratory.

Disclosure of Invention

The invention aims to provide a waste layered combustion device, which utilizes an air shift arch-changing fixed bed to simulate the layered combustion process of waste on a moving bed, and further researches the temperature runaway phenomenon and corresponding pollutant emission in the layered combustion process.

The invention is realized by the following technical scheme:

a waste layered combustion device comprises an air source, an oxygen source, a flow controller group, a control system, an air chamber group, a fire grate, a hearth and a replaceable furnace arch pair arranged in the hearth, wherein a plurality of temperature measuring points are arranged on the wall surface of one side of the hearth, the temperature can be measured through a thermocouple group, and the thermocouple group comprises a plurality of thermocouples; the furnace arch pair comprises a detachable front arch and a detachable rear arch, and can form a throat and a flue gas flow direction of concurrent flow, countercurrent flow or mixed flow in the hearth; the air chamber group is arranged at the bottom of the grate and comprises a plurality of air chambers arranged along the length direction of the grate; the flow controller group and the air chamber group are arranged in a one-to-one corresponding mode, the flow controller group comprises an air flow controller group and an oxygen flow controller group which are arranged in a one-to-one corresponding mode, the air flow controller group comprises a plurality of air flow controllers, and the oxygen flow controller group comprises a plurality of oxygen flow controllers; the air source is connected with the air chambers of the air chamber group one by one through air pipelines, and each air pipeline is provided with an air flow controller; the oxygen source is connected with the air chambers of the air chamber group one by one through oxygen pipelines, and each oxygen pipeline is provided with an oxygen flow controller; the thermocouple, the air flow controller and the oxygen flow controller are connected with the control system through signal wires.

In the above technical solution, the air chamber includes n air chambers and corresponding n air flow controllers and n oxygen flow controllers, where n is an integer greater than or equal to 2.

In the technical scheme, the hearth comprises a front wall, a rear wall, a left side wall and a right side wall, and cooling coils are arranged on the outer sides of the front wall, the rear wall, the left side wall and the right side wall; the lower part of the front wall is provided with a front ignition gun, and the lower part of the rear wall is provided with a rear ignition gun.

In the technical scheme, the right side wall is provided with a filling hole, a smoke sampling hole, a pressure measuring point and a plurality of secondary air nozzles.

In the technical scheme, the angle alpha of the side of the detachable rear arch is 50-80 degrees.

A method of simulating moving bed combustion of waste comprising:

acquiring operation parameters of a moving bed to be simulated, wherein the parameters comprise a moving bed grate air volume curve function Q ═ f (x), and x is a moving bed waste real-time position;

the grate is long L, the air chambers comprise a 1 st air chamber to an ith air chamber, and the distance from the starting end of the ith air chamber to the starting end of the grate is y_iWherein 0 is less than or equal to y_i<Setting the virtual moving speed v of the grate waste according to the simulation assumption of waste movement, and calculating and obtaining an instant time-shift air volume curve q at the t moment of each air chamber_i＝k₁f(y_i+ vt) where k₁Is a scaling factor and has (y)_iQ is 0 when + vt) is more than or equal to L;

selecting and installing a replaceable furnace arch pair according to the expected flue gas flow direction, so that the expected flue gas flow direction in the hearth comprises any one of forward flow, reverse flow or mixed flow;

uniformly laying waste on the whole surface or partial surface of the fire grate; the air supply is started through the control system, and the instant time shift air volume curve q of any ith air chamber is obtained_i＝k₁f(y_i+ vt) adjusting the oxygen flow controller and the air flow controller such that the amount q of air supplied through the oxygen source and the air source_i,o2And q is_i,airThe sum is q, and q_i,o2And q is_i,airThe proportion of (a) is adjusted according to the excess air factor; igniting the waste to burn, and collecting and recording temperature signals from the thermocouple group through a control system;

the control system collects and records temperature signals from the thermocouple group, and simultaneously extracts flue gas from the flue gas sampling hole to perform gas composition analysis to obtain combustion gas product information, wherein the gas composition comprises O₂、CO、NOx、SO₂、PAH；

Stopping air supply when t is equal to L/v, and finishing simulated combustion;

and after the hearth is cooled, sampling and analyzing the solid residues.

In the technical scheme, the secondary air is sprayed from the secondary air nozzle through the control and adjustment of the control system.

According to the technical scheme, the local high temperature and the local high temperature generation conditions are analyzed according to the collected temperature signals, and modeling analysis is carried out according to the temperature signals and/or gas product information.

The invention has the following advantages and prominent effects: firstly, the moving burning process of the material is simulated through the change of the air volume, so that the research process is simplified; secondly, a replaceable furnace arch pair composed of a detachable front arch and a detachable rear arch is adopted, and the heat transfer, mass transfer and combustion processes in the hearth can be changed by changing the form of the furnace arch, so that an optimized furnace arch structure is provided for engineering design.

Drawings

FIG. 1 is a schematic front view of one embodiment of a layered waste combustion apparatus according to the present invention.

Fig. 2 is a side schematic view of the embodiment shown in fig. 1.

Fig. 3 is a schematic view of a grate according to the embodiment of fig. 1.

FIG. 4 is a schematic view of a downstream furnace crown pair according to the present invention.

FIG. 5 is a schematic view of a counter flow arch pair according to the present invention.

Fig. 6 is a schematic view of a mixed flow furnace arch pair according to the present invention.

Fig. 7 is a schematic diagram of grate air distribution of a waste layered combustion device according to the present invention.

In the figure: 1-flow controller group; 2-a source of air; 3-an air duct; 4-a wind room group; 5-front ignition gun; 6-front cooling coil pipe; 7-front wall; 8-detachable front arch; 9-L-shaped hooks; 10-T type pothooks; 11-quick-pressing bolts; 12-a smoke hood; 13-explosion vent; 14-flue; 15-a cleaning device; 16-a draught fan; 17-secondary air oxygen flow controller; 18-a secondary air flow controller; 19-a rear ignition gun; 20-a control system; 21-a source of oxygen; 22-flue gas sampling hole; 23-detachable rear arch; 24-post cooling coils; 25-secondary air valve; 26-secondary air nozzles; 27-thermocouple group; 28-temperature measuring point; 29-side cooling coils; 30-filler holes; 41-furnace top wall; 42-rear wall; 43-a grate; 44-furnace bottom wall; 45-left side wall; 46-right side wall; 47-waste; 48-furnace arch pair; 49-blast cap; 50-an oxygen pipeline; 51-pressure measurement point; 52-upper furnace space; 53-lower space of furnace; 54-laryngeal orifice; 55-flue gas flow direction; 56-hearth.

Detailed Description

The following will further describe the specific implementation and operation of the present invention with reference to the drawings and examples.

The terms of orientation such as up, down, left, right, front, and rear in the present specification are established based on the positional relationship shown in the drawings. The corresponding positional relationship may also vary depending on the drawings, and therefore, should not be construed as limiting the scope of protection.

As shown in figures 1 and 2, the layered waste combustion device comprises an air source 2, an oxygen source 21, a flow controller group 1, a control system 20, an air chamber group 4, a fire grate 43, a hearth 56 and a replaceable arch pair 48 arranged on the hearth 56. The top of the hearth 56 is also provided with a smoke hood 12, a cleaning device 15 and an induced draft fan 16, and the smoke hood 12, the cleaning device 15 and the induced draft fan 16 are connected through a flue 14. An explosion-proof door 13 is also arranged above the smoke hood 12.

As shown in fig. 3, the air chamber set 4 is disposed at the bottom of the grate 43, and the air chamber set 4 includes two or more air chambers, which are denoted as ith air chamber, where i is (1,2,3, …, n) (n is an integer greater than or equal to 2). The air chambers are arranged along the length direction of the grate, the flow controller groups 1 and the air chamber groups 4 are arranged in a one-to-one correspondence mode, and mass flow controllers are optimized. The flow controller group 1 comprises an air flow controller group and an oxygen flow controller group which are arranged in a one-to-one correspondence mode, the air flow controller group comprises a plurality of air flow controllers, and the oxygen flow controller group comprises a plurality of oxygen flow controllers. The grate 43 is L long and the ith air chamber is L long_iThe distance between the starting end of the ith air chamber and the starting end of the grate is y_iWherein 0 is less than or equal to y_i<L, and i ═ (1,2, …, n). Namely the distance between the starting end of the 1 st air chamber and the starting end of the fire grate is y₁，y₁0. The distance from the starting end of the 2 nd air chamber to the starting end of the fire grate is y₂… …, the distance from the starting end of the nth wind chamber to the starting end of the grate is y_nAnd has (y)_n+l_n) Less than or equal to L. Accordingly, the air flow controller includes n air flow controllers, denoted as the ith air flow controller, i ═ 1,2, …, n, i.e., MFC1₁、MFC1₂、…、MFC1_n(ii) a Oxygen flow controllers n oxygen flow controllers, denoted as the ith oxygen flow controller, i.e. MFC2₁、MFC2₂、…、MFC2_n. The air source 2 is connected with the air chambers of the air chamber group one by one through an air pipeline 3, each air pipeline is provided with an air flow controller, the oxygen source 21 is connected with the air chambers of the air chamber group one by one through an oxygen pipeline 50, and each oxygen pipeline is provided with an oxygen flow controller. The top of the air chamber is provided with an air distribution plate, and an air cap 49 is arranged on the air distribution plate.

The pair of arches 48 includes a removable front arch 8 and a removable rear arch 23 that can form a throat 54 in a firebox 56. The space above the throat 54 is the upper space 52 of the furnace, and the lower space 53 of the furnace is below. The angle alpha at the side of the detachable rear arch 23 is 50-80 deg.

The hearth 56 comprises a front wall 7, a rear wall 42, a left side wall 45, a right side wall 46, a furnace bottom wall 44 and a furnace top wall 41, and cooling coils are arranged on the outer sides of the front wall 7, the rear wall 42, the left side wall 45 and the right side wall 46 and comprise a front cooling coil 6, a rear cooling coil 24 and a side cooling coil 29. The detachable front arch 8 and the detachable rear arch 23 are fixed on the front wall 7, the rear wall 42 and the furnace roof wall 41 through L-shaped hooks 9 and T-shaped hooks 10. The front wall 7, the rear wall 42, the left side wall 45 and the right side wall 46 are fixed to the hearth wall 44 and the roof wall 41 by quick press bolts 11 as shown in fig. 2. The special-shaped refractory bricks with different structures are used for forming the detachable front arch 8 and the detachable rear arch 23 which are matched with each other and have different shapes, so that different flue gas flow directions can be formed in the lower spaces of the fire grate and the hearth, and the flue gas flow directions are respectively the forward flow, the reverse flow and the mixed flow as shown in figures 4-6. When a downstream furnace arch pair is adopted, the flue gas flow and the garbage move in the same direction, the flue gas enters the upper space of the hearth, and the throat is positioned at the tail part of the fire grate; when a counter-flow furnace arch pair is adopted, the movement direction of flue gas flow is opposite to that of garbage, the flue gas enters the upper space of a hearth, and a throat is positioned at the front part of a fire grate; when the mixed flow furnace arch pair is adopted, the flow direction of the flue gas flow is between a downstream flow type and a counter flow type, the flue gas enters the upper space of the hearth, and the throat is positioned in the middle of the fire grate.

A plurality of temperature measuring points 28 are arranged on one side wall surface of the hearth 56, the temperature can be measured by placing a thermocouple group 27, and the thermocouple group 27 comprises a plurality of thermocouples which are arranged on the right side wall 46 in a rectangular array.

The right side wall 46 is provided with a filling hole 30 for placing materials (waste), a smoke sampling hole 22, a pressure measuring point 51 and a secondary air nozzle 26. The secondary air nozzle 26 is respectively connected with the oxygen source 21 and the air source 2 through a secondary air main pipe, a secondary air valve 25 is arranged on the connecting side of the secondary air main pipe and the secondary air nozzle 26, and a secondary air oxygen flow controller 17 and a secondary air flow controller 18 are respectively arranged on the connecting side of the secondary air main pipe and the oxygen source 21 and the air source 2. The secondary air valve 25, the secondary air oxygen flow controller 17 and the secondary air flow controller 18 are also connected with the control system 20 through signal lines.

Ignition devices such as a plasma ignition device, a gas ignition device and the like are arranged at the front part and the rear part of the fire grate in the hearth, and the plasma ignition device, the gas ignition device and the like can be used as ever-burning flames to support waste and stably burn. Preferably, a front ignition gun 5 and a rear ignition gun 19 are provided on the front wall 7 and the rear wall 42, respectively.

The thermocouple, air flow controller, and oxygen flow controller are all connected to the control system 20 via signal lines. The control system is controlled by software, the program controls the air supply quantity and the change along with the time, and acquires signals such as temperature, pressure and the like.

In order to conveniently research the combustion process and pollutant generation characteristics of waste in a layered combustion device in a laboratory, the method is similar to the three-phase asynchronous motor principle (the magnetic field rotates and the stator does not rotate) and the virtual reality principle (people do not move and the view of eyes is moving), and simulates the combustion process of the waste on a grate by using the mode that the waste is still and the air supply quantity of each air chamber changes along with time, so that the real combustion condition in a moving bed is researched by using a fixed bed driven by time-shifting air, namely the waste per se is still, and after the waste is supposed to move to a certain position above the grate, the air supply quantity of the air which is supposed to move to the certain position is supplied by the air chamber where the waste is really still. When a layered combustion laboratory is carried out on a certain specific waste, firstly, an air supply curve under a continuous feeding stable working condition is determined, and the air supply volume of each air chamber does not change along with time and is a certain value; and then determining the air volume of each air chamber during feeding according to the set garbage moving speed, wherein the air volume of each air chamber is a value which changes along with time, and the value is the simulation assumption of waste moving. Through modeling, different time-shifting air volume models can be adopted to consider the influences of material overlapping, furnace arch radiation, heat and mass transfer and the like.

Accordingly, a method of simulating moving bed combustion of waste comprising the following steps.

Firstly, obtaining the operation parameters of the moving bed to be simulated according to industrial tests, incinerator operation data or information provided by manufacturers, wherein the operation parameters comprise a moving bed air volume curve function Q ═ f (x), and x is the real-time position of moving bed waste, namely the distance x of the waste from the starting end of a grate.

According to the simulation assumption of waste movement, setting the virtual movement speed of the grate waste as v, and calculating to obtain an instant time-shift air volume curve of any air chamber (i-th air chamber) at t as q_i＝k₁f(y_i+ vt) and has the formula (y)_iAnd q is 0 when + vt) is larger than or equal to L. The virtual moving speed of the grate waste is set according to the simulation requirement.

Uniformly spreading the waste 47 on the grate above the ith air chamber, wherein the waste above the ith air chamber is marked as w_i(i ═ 1,2, …, N), when N>And when N is needed, no waste is laid on the grates above the (N + 1) th to the nth wind chambers. N is the number of air chambers of the moving bed to be simulated, and N is more than or equal to N generally.

For virtually moving waste, not only the air volume of each plenum is varied as a function of the air volume f (x), but also the waste w above the ith plenum_iIn other words, the time for virtually moving the air flow to the ith air chamber at the virtual moving speed v is also included, so that the air flow to any ith air chamber at the time t is q_i＝k₁f(y_i+ vt) as illustrated in fig. 7.

Next, a replaceable crown pair 48 is selected and installed according to the desired flue gas flow direction. The special-shaped refractory bricks with different structures are used as furnace arches, so that the arrangement of the flue gas in the hearth in the forward flow, the reverse flow or the mixed flow is realized. When the concurrent furnace arch pair is adopted, the flue gas flow and the garbage move in the same direction, and the flue gas inlet throat is positioned at the tail part of the fire grate (figure 4). When the counter-flow furnace arch pair is adopted, the flue gas flow is opposite to the movement direction of the garbage, and the flue gas inlet throat is positioned at the front part of the fire grate (figure 5). When the mixed flow furnace arch pair is adopted, the flow direction of the flue gas flow is between a forward flow type and a reverse flow type, and the flue gas inlet throat is positioned in the middle of the fire grate (figure 6).

The waste is uniformly spread on the whole surface or partial surface of the grate 43 through the filling holes. The air supply is started through the control system 20, and the instant time shift air volume curve q of the ith air chamber is adopted_i＝f(y_i+ vt) adjusting the ith oxygen flow controller and the ith air flow controller so that the ith air chamber passes through the oxygen source 21 and the air supply rate q of the air source 2 respectively_i,o2And q is_i,airThe sum of q_iAnd q is_i,o2And q is_i,airThe proportion of (2) is adjusted according to the excess air coefficient and the required bed oxygen concentration, the total oxygen supply amount and the local oxygen concentration can be adjusted through the proportion adjustment, and the 'temperature runaway' can be induced by increasing the local oxygen concentration.

The waste is ignited by the ignition device and burned, and the temperature signal from the thermocouple group 27 is collected and recorded by the control system 20. Simultaneously, O in the smoke gas detected by extracting the smoke gas from the smoke gas sampling hole₂And CO, NOx, SO₂And PAH, etc.

And when t is equal to L/v, stopping air supply, finishing the simulated combustion, and collecting residues after the combustion for detection and analysis.

The overfire air oxygen flow control and overfire air flow control may also be adjusted as necessary to provide overfire air through the overfire air jets 26.

And analyzing the local high temperature and the generation condition of the local high temperature according to the collected temperature signal, and modeling and analyzing by using the temperature signal and/or the gas product information.

Furthermore, the waste is separately ground by spreading it uniformly over the entire surface or over part of the surface of the grateThe influence of the radiation of the arch on the local combustion of the waste is studied. For example, the waste is laid below the front arch of the whole grate, and the influence of the front arch on combustion can be studied; the waste is only laid below the rear arch, and the rest of the waste is not laid, so that the influence of the rear arch on combustion can be researched; the waste is only laid in the middle of the fire grate, so that the comprehensive influence of the front arch and the rear arch can be researched. When directly according to q_i＝k₁f(y_i) When the air quantity of the air chamber is distributed, the influence of the furnace arch on the combustion process during the combustion of the fixed bed can be directly simulated.

The ideal air volume curve function Q ═ f (x) of the moving bed grate to be simulated is a continuous function along the direction of the moving bed grate, but the air chamber of the actual industrial equipment is independent and limited, so that the function is a piecewise function, thereby ensuring that Q is a piecewise function_i＝k₁f(y_i+ vt) is also a piece function. The piecewise function approaches an ideal continuous function as the number of plenums increases. k is a radical of₁The scaling factor is usually related to the amount of credit processing.

Different combinations of air quantity in the air chamber and the like can simulate various mobile burning processes, and through corresponding numerical calculation and model analysis, the combustion characteristic, the temperature-runaway characteristic, the pollution emission characteristic and the pollutant generation interaction influence of independent classified garbage or classified garbage and industrial solid waste mixed burning in the layered combustion device can be completed.

When the moving bed grate incinerator with more simulation air chambers is used, the number n of the air chambers of the device can be configured according to the actual grate incinerator. The number N of the air chambers can be determined according to actual conditions, and N is more than or equal to N and more than or equal to 2.

In order to simulate the temperature runaway caused by uneven heat value of the waste, the waste with different heat values can be paved on the surface of the fire grate according to the requirement, so that the influence of the heat value difference of the waste on the temperature runaway is identified.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.