阅读说明：本技术 一种高含氨酸性气与液体硫磺联合处理方法 (Combined treatment method for high-ammonia-content acidic gas and liquid sulfur ) 是由 赵建鑫 吴英来 张雪杰 陈英斌 徐晓燕 罗娟 李颖 孟建 张成昆 于 2021-06-24 设计创作，主要内容包括：本发明公开了一种高含氨酸性气与液体硫磺联合处理方法,其特征在于：将高含氨酸性气与液体硫磺联合进行焚烧处理得到焚烧后的烟气,将焚烧后的烟气经余热锅炉回收热量降低降烟气温度到300～400℃后,进入后续反应制取浓硫酸；所述焚烧后的烟气的组分包括SO-2,SO-3,O-2,CO-2,N-2,H-2O；其中SO-2,浓度为10%～30%,O-2含量为2%～10%；所述高含氨酸性气为含氨量为5-20%的酸性气体。本发明通过液体硫磺的引入,提高了炉内SO-2的含量,并且保证后续SO-2制取硫酸催化剂对烟气中SO-2的含量的要求。(The invention discloses a combined treatment method of high-ammonia-content acidic gas and liquid sulfur, which is characterized by comprising the following steps of: carrying out combined incineration treatment on high-ammonia-content acidic gas and liquid sulfur to obtain incinerated flue gas, recovering heat of the incinerated flue gas by a waste heat boiler, reducing the temperature of the flue gas to 300-400 ℃, and then carrying out subsequent reaction to prepare concentrated sulfuric acid; the components of the incinerated flue gas comprise SO 2 ，SO 3 ，O 2 ，CO 2 ，N 2 ，H 2 O; wherein SO 2 Concentration of 10% -30%, O 2 The content is 2% -10%; the high ammonia-containing acid gas is an acid gas with ammonia content of 5-20%. The invention improves SO in the furnace by introducing the liquid sulfur 2 And ensuring subsequent SO 2 Preparation of sulfuric acid catalyst for SO in flue gas 2 The requirement of the content of (A).)

1. A combined treatment method of high-ammonia-content acidic gas and liquid sulfur is characterized by comprising the following steps: carrying out combined incineration treatment on high-ammonia-content acidic gas and liquid sulfur to obtain incinerated flue gas, recovering heat of the incinerated flue gas by a waste heat boiler, reducing the temperature of the flue gas to 300-400 ℃, and then carrying out subsequent reaction to prepare concentrated sulfuric acid; the components of the incinerated flue gas comprise SO₂，SO₃，O₂，CO₂，N₂，H₂O; wherein SO₂Concentration of 10% -30%, O₂The content is 2% -10%; the high ammonia-containing acid gas is an acid gas with ammonia content of 5-20%.

2. The combined treatment method of sulfur in high ammonia-containing acidic gas liquid according to claim 1, characterized in that: the combined treatment method of the high-ammonia-content acidic gas and the liquid sulfur treats the high-ammonia-content acidic gas through a combined treatment system; the combined treatment system comprises a high ammonia-containing acid gas-sulfur combined treatment burner, an incinerator, a waste heat boiler and an air fan; the high ammonia-containing acid gas-sulfur combined treatment burner is arranged at the furnace end of the incinerator; the high ammonia-containing acid gas-sulfur combined processor is respectively provided with a high ammonia-containing acid gas spraying device and a liquid sulfur spraying device, and the sprayed liquid can be sprayed to the inner cavity of the incinerator; a furnace end position, a furnace middle position and a furnace outlet of the incinerator are all provided with a high-temperature oxygen analyzer; a circle of air supply ports which control the air quantity through a motor are arranged at the middle position of the incinerator; and the gas output from the outlet of the incinerator is input into a waste heat boiler through a pipeline for cooling.

3. The combined treatment method of high ammonia-containing acid gas and liquid sulfur according to claim 2, characterized in that: the combined incineration treatment of the high-ammonia-content acidic gas and the liquid sulfur specifically comprises the following steps: spraying the high-ammonia-content acidic gas and the liquid sulfur into an incinerator through a high-ammonia-content acidic gas-sulfur combined treatment burner; igniting by an ignition device and introducing for incinerationMixed gas of high ammonia-containing acid gas and sulfur in the furnace; measuring the flue gas O at the burner position by a first high temperature oxygen content analyzer mounted at the burner of the incinerator₂The content and the temperature of the furnace end; measuring the flue gas O at the middle position of the incinerator by a second high-temperature oxygen content analyzer arranged at a middle air supply port of the incinerator₂The content and the temperature; measuring the flue gas O at the outlet of the incinerator by a third high-temperature oxygen content analyzer arranged at the outlet of the incinerator₂The content and the temperature; the three high-temperature oxygen content analyzers control the air flow meter to be self-regulated by controlling an air supply port motor arranged in the middle of the incinerator, and control the temperature or/and the O at the furnace end, the furnace middle and the outlet of the incinerator₂Content (c); specifically controlling the temperature of the furnace end to 1250-1400 ℃ and O₂The content is about 2% -10%; controlling the middle flue gas O of the furnace₂The content is 0; controlling the furnace outlet O₂The content is 2% -10%.

4. The combined treatment method of high ammonia-containing acid gas and liquid sulfur according to claim 2, characterized in that: the temperature of flue gas at the outlet of the incinerator is 900-1150 ℃, and the flue gas is cooled to 300-400 ℃ by a waste heat boiler and then enters a subsequent reaction to prepare concentrated sulfuric acid.

5. The combined treatment method of high ammonia-containing acid gas and liquid sulfur according to claim 2, characterized in that: the high ammonia-containing acid gas-sulfur combined treatment burner is communicated with the high ammonia-containing acid gas runner and the liquid sulfur runner; the ammonia-containing acidic gas flow channel and the liquid sulfur flow channel spray objects into the middle cavity of the incinerator through the spray head.

6. The combined treatment method of high ammonia-containing acid gas and liquid sulfur according to claim 2, characterized in that: and the motor of the air supply opening is a variable frequency motor.

7. The combined treatment method of high ammonia-containing acid gas and liquid sulfur according to claim 5, characterized in that: the liquid sulfur runner is provided with a steam jacket for heat tracing, and the liquid sulfur runner is provided with a steam outer jacket heat-preservation type remote mass flow meter.

Technical Field

The invention relates to the technical field of acid gas treatment, in particular to a combined treatment method of high-ammonia-content acid gas and liquid sulfur.

Background

At present, in the production processes of petrochemical industry, coal chemical industry and the like, sulfur and nitrogen in raw materials finally form high-ammonia-content acid gas containing ammonia and hydrogen sulfide through a processing process. For acid gas with low hydrogen sulfide concentration and high ammonia content, if the Claus sulfur recovery process is adopted, the temperature of the acid gas combustion furnace is low, the sulfur recovery rate is influenced, and the ammonia decomposition is incomplete; in order to ensure complete ammonia, the furnace temperature needs to be increased, fuel gas must be added into the raw material acid gas, so that on one hand, the energy consumption is increased, and on the other hand, in the actual operation, the fuel gas is easy to cause black sulfur because the fuel gas is incompletely combusted in an anoxic environment. Thus, the claus sulfur recovery process is not suitable for treating acid gases containing higher levels of ammonia. When the complexing iron method is used for treating the ammonia-containing acidic gas, the content of NH3 in the feed gas also needs to be controlled, and too high content of NH3 can cause fine sulfur particles, poor settling effect and difficult filtration and dehydration. The sulfur generated in the reaction process can not be separated from the system, and finally the system can not normally operate, and the tail gas must be burnt by a special combustion furnace, so that the energy consumption is very high. Therefore, the complex iron method hydrogen sulfide removal process is also not suitable for the treatment of acid gas with high ammonia content. In conclusion, the existing treatment method for treating the high-ammonia-content acidic gas has low treatment efficiency, and ammonium salt is easily formed in subsequent reaction to block equipment and pipelines, so that the long-term stable operation of the device is not facilitated.

Disclosure of Invention

1. The technical problem to be solved is as follows:

aiming at the technical problems, the invention provides a combined treatment method of high-ammonia-content acidic gas and liquid sulfur, wherein flue gas obtained by combined incineration treatment of the flue gas and the liquid sulfur is recovered by a waste heat boiler, the temperature of the flue gas is reduced to 300-400 ℃, and the flue gas is subjected to subsequent reaction to prepare concentrated sulfuric acid.

2. The technical scheme is as follows:

a combined treatment method of high-ammonia-content acidic gas and liquid sulfur is characterized by comprising the following steps: carrying out combined incineration treatment on high-ammonia-content acidic gas and liquid sulfur to obtain incinerated flue gas, recovering heat of the incinerated flue gas by a waste heat boiler, reducing the temperature of the flue gas to 300-400 ℃, and then carrying out subsequent reaction to prepare concentrated sulfuric acid; the components of the incinerated flue gas comprise SO₂，SO₃，O₂，CO₂，N₂，H₂O; wherein SO₂Concentration of 10% -30%, O₂The content is 2% -10%; the high ammonia-containing acid gas is acid gas with ammonia content of 5-20%.

Further, the high ammonia-containing acid gas and liquid sulfur combined treatment method treats the high ammonia-containing acid gas through a combined treatment system; the combined treatment system comprises a high ammonia-containing acid gas-sulfur combined treatment burner, an incinerator, a waste heat boiler and an air fan; the high ammonia-containing acid gas-sulfur combined treatment burner is arranged at the furnace end of the incinerator; the high ammonia-containing acid gas-sulfur combined processor is respectively provided with a high ammonia-containing acid gas spraying device and a liquid sulfur spraying device, and the sprayed liquid can be sprayed to the inner cavity of the incinerator; a furnace end position, a furnace middle position and a furnace outlet of the incinerator are all provided with a high-temperature oxygen analyzer; a circle of air supply ports which control the air quantity through a motor are arranged at the middle position of the incinerator; and the gas output from the outlet of the incinerator is input into a waste heat boiler through a pipeline for cooling.

Further, the combined incineration treatment of the high ammonia-containing acid gas and the liquid sulfur specifically comprises the following steps: spraying the high-ammonia-content acidic gas and the liquid sulfur into an incinerator through a high-ammonia-content acidic gas-sulfur combined treatment burner; igniting the mixed gas of the high ammonia-containing acidic gas and the sulfur introduced into the incinerator by an ignition device; measuring the flue gas O at the burner position by a first high temperature oxygen content analyzer mounted at the burner of the incinerator₂The content and the temperature of the furnace end; measuring the flue gas O at the middle position of the incinerator by a second high-temperature oxygen content analyzer arranged at a middle air supply port of the incinerator₂The content and the temperature; measuring the flue gas O at the outlet of the incinerator by a third high-temperature oxygen content analyzer arranged at the outlet of the incinerator₂The content and the temperature; the three high-temperature oxygen content analyzers control the air flow meter to be self-regulated by controlling an air supply port motor arranged in the middle of the incinerator, and control the temperature or/and the O at the furnace end, the furnace middle and the outlet of the incinerator₂Content (c); specifically controlling the temperature of the furnace end to 1250-1400 ℃ and O₂The content is about 2% -10%; controlling the middle flue gas O of the furnace₂The content is 0; controlling the furnace outlet O₂The content is 2% -10%.

Further, the temperature of flue gas at the outlet of the incinerator is 900-1150 ℃, and the flue gas is cooled to 300-400 ℃ by a waste heat boiler and then enters a subsequent reaction to prepare concentrated sulfuric acid.

Further, the high ammonia-containing acid gas-sulfur combined treatment burner is communicated with a high ammonia-containing acid gas runner and a liquid sulfur runner; the ammonia-containing acidic gas flow channel and the liquid sulfur flow channel spray objects into the middle cavity of the incinerator through the spray head.

Further, the motor of the air supply opening is a variable frequency motor.

Further, the liquid sulfur runner is provided with a steam jacket for heat tracing, and the liquid sulfur runner is provided with a steam outer jacket heat preservation type remote mass flow meter.

3. Has the advantages that:

in the treatment method, high-ammonia-content acidic gas and liquid sulfur are subjected to incineration treatment, wherein the liquid sulfur is used as main combustionA compound (I) is provided. The introduction of liquid sulfur improves SO in the furnace₂And ensuring subsequent SO₂Preparation of sulfuric acid catalyst for SO in flue gas₂The requirement of the content of (A). A first high-temperature oxygen content analyzer is arranged on the burner of the incinerator for measuring the flue gas O of the burner₂The content and the temperature of the furnace end are automatically adjusted with a furnace entering flow meter of liquid sulfur entering the furnace, and the air volume of the furnace end is controlled to ensure that the furnace end O is ensured₂The content is about 0. A second high-temperature oxygen content analyzer is arranged at the middle part of the rear part of the air supply opening in the middle of the incinerator for measuring the smoke O in the incinerator₂The content and the temperature are automatically adjusted with an air flow meter for supplying air into the furnace to control the flue gas O in the furnace₂The content is 0. The air fan adopts a variable frequency motor to adjust the total air quantity entering the furnace, so as to ensure that the flue gas O of an outlet pipeline of the incinerator is burnt₂The content is 2% -10%. Set up steam jacket heat preservation teletransmission mass flowmeter on the liquid sulphur pipeline, control burns burning furnace temperature, realizes that automated control goes into stove liquid sulphur volume, and this kind of flowmeter data is directly perceived, and the structure can effectively prevent the inside jam of flowmeter, has improved operational safety and convenience.

In the aspect of equipment, a high-ammonia-content acid gas-sulfur combined treatment combustor is used, the high-ammonia-content acid gas-sulfur combined treatment combustor is made of high-temperature-resistant silicon carbide, an acid gas flow channel and a spray head are arranged by adopting a special honeycomb-shaped low-nitrogen combustion treatment technology, and NH in the high-ammonia-content acid gas can be treated₃Conversion to N₂The method effectively reduces the content of nitrogen oxides in the high-temperature flue gas, avoids subsequent formation of ammonium salt, blockage of equipment and pipelines, effectively reduces the ash removal operation cost of downstream equipment, and ensures long-term stable operation of the device. The combustor is provided with a liquid sulfur runner, and the liquid sulfur enters the incinerator to provide high-temperature heat energy for the hearth together with the acid gas.

Drawings

FIG. 1 is a schematic diagram of an apparatus for carrying out the method.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

A combined treatment method of high-ammonia-content acidic gas and liquid sulfur is characterized by comprising the following steps: the acid gas with high ammonia content and liquid sulfur are jointly incineratedObtaining incinerated flue gas, recovering heat from the incinerated flue gas through a waste heat boiler, reducing the temperature of the flue gas to 300-400 ℃, and then performing subsequent reaction to prepare concentrated sulfuric acid; the components of the incinerated flue gas comprise SO₂，SO₃，O₂，CO₂，N₂，H₂O; wherein SO₂Concentration of 10% -30%, O₂The content is 2% -10%; the high ammonia-containing acid gas is an acid gas with ammonia content of 5-20%.

Further, the high ammonia-containing acid gas and liquid sulfur combined treatment method treats the high ammonia-containing acid gas through a combined treatment system; the combined treatment system comprises a high ammonia-containing acid gas-sulfur combined treatment burner, an incinerator, a waste heat boiler and an air fan; the high ammonia-containing acid gas-sulfur combined treatment burner is arranged at the furnace end of the incinerator; the high ammonia-containing acid gas-sulfur combined processor is respectively provided with a high ammonia-containing acid gas spraying device and a liquid sulfur spraying device, and the sprayed liquid can be sprayed to the inner cavity of the incinerator; a furnace end position, a furnace middle position and a furnace outlet of the incinerator are all provided with a high-temperature oxygen analyzer; a circle of air supply ports which control the air quantity through a motor are arranged at the middle position of the incinerator; and the gas output from the outlet of the incinerator is input into a waste heat boiler through a pipeline for cooling.

Further, the combined incineration treatment of the high ammonia-containing acid gas and the liquid sulfur specifically comprises the following steps: spraying the high-ammonia-content acidic gas and the liquid sulfur into an incinerator through a high-ammonia-content acidic gas-sulfur combined treatment burner; igniting the mixed gas of the high ammonia-containing acidic gas and the sulfur introduced into the incinerator by an ignition device; measuring the flue gas O at the burner position by a first high temperature oxygen content analyzer mounted at the burner of the incinerator₂The content and the temperature of the furnace end; measuring the flue gas O at the middle position of the incinerator by a second high-temperature oxygen content analyzer arranged at a middle air supply port of the incinerator₂The content and the temperature; measuring the flue gas O at the outlet of the incinerator by a third high-temperature oxygen content analyzer arranged at the outlet of the incinerator₂The content and the temperature; the three high-temperature oxygen content analyzers control an air supply port motor arranged in the middle of the burning furnace to perform air flow meterSelf-regulation, controlling the temperature or/and O at the burner, the intermediate space and the outlet of the incinerator₂Content (c); specifically controlling the temperature of the furnace end to 1250-1400 ℃ and O₂The content is about 2% -10%; controlling the middle flue gas O of the furnace₂The content is 0; controlling the furnace outlet O₂The content is 2% -10%.

Further, the temperature of flue gas at the outlet of the incinerator is 900-1150 ℃, and the flue gas is cooled to 300-400 ℃ by a waste heat boiler and then enters a subsequent reaction to prepare concentrated sulfuric acid.

Further, the high ammonia-containing acid gas-sulfur combined treatment burner is communicated with a high ammonia-containing acid gas runner and a liquid sulfur runner; the ammonia-containing acidic gas flow channel and the liquid sulfur flow channel spray objects into the middle cavity of the incinerator through the spray head.

Further, the motor of the air supply opening is a variable frequency motor.

Further, the liquid sulfur runner is provided with a steam jacket for heat tracing, and the liquid sulfur runner is provided with a steam outer jacket heat preservation type remote mass flow meter. The temperature of the air liquid sulfur is controlled by a steam outer jacket heat preservation remote transmission mass flowmeter of the liquid sulfur before entering the incinerator.

The specific embodiment is as follows:

example 1:

as shown in figure 1, the flow rate of liquid sulfur entering the high-ammonia acid gas-sulfur combined treatment combustor is 940.6kg/h, and the flow rate of acid gas is 2200Nm³H, volume content of each component of the acid gas, C1: 0.13 percent; c2: 0.13 percent; NH (NH)₃：23.48%；H₂S：44.50%；CO₂：26.60%；CO：0.18%；H₂O: 4.97 percent. Total air quantity 16733Nm at outlet of air fan³H, wherein the furnace end air volume is 10494Nm³6239Nm of air supplement in the furnace³H is used as the reference value. The furnace end temperature of the incinerator is 1250 ℃, and the discharging temperature of the incinerator is 910 ℃. The temperature of the flue gas at the outlet of the waste heat boiler is 350 ℃, and the volume content, SO, of each component₂：8.01%；CO₂：2.81%；O₂：6.67%；N₂：72.23%；H₂O：10.28%。

Example 2:

as shown in figure 1, the sulfur which is high ammonia-containing acid gas entersThe liquid sulfur flow rate of the combined treatment combustor is 914.5kg/h, and the acid gas flow rate is 2200Nm³H, volume content of each component of the acid gas, C1: 0.20 percent; c2: 0.13 percent; NH (NH)₃：19.82%；H₂S：48.81%；CO₂：25.97%；CO：0.11%；H₂O: 4.97 percent. Total air volume 18337Nm of air fan outlet³H, wherein the furnace end air volume is 11624Nm³/h, stove inside air supply 6713Nm³H is used as the reference value. The furnace end temperature of the incinerator is 1300 ℃, and the discharging temperature of the incinerator is 950 ℃. The temperature of the flue gas at the outlet of the waste heat boiler is 350 ℃, and the volume content, SO, of each component₂：8.15%；CO₂：2.77%；O₂：6.59%；N₂：72.23%；H₂O：10.26%。

Example 3:

as shown in figure 1, the flow rate of liquid sulfur entering the high-ammonia acid gas-sulfur combined treatment combustor is 914.5kg/h, and the flow rate of acid gas is 2500Nm³H, volume content of each component of the acid gas, C1: 0.12 percent; c2: 0.13 percent; NH (NH)₃：22.11%；H₂S：49.69%；CO₂：22.44%；CO：0.16%；H₂O: 5.34 percent. Total air quantity 18038Nm at air fan outlet³Per hour, wherein the furnace end air volume 13972Nm³Per, oven internal air supplement 4066Nm³H is used as the reference value. The furnace end temperature of the incinerator is 1300 ℃, and the discharging temperature of the incinerator is 1105 ℃. The temperature of the flue gas at the outlet of the waste heat boiler is 350 ℃, and the volume content, SO, of each component₂：9.65%；CO₂：2.74%；O₂：4.00%；N₂：71.59%；H₂O：12.02%。

Example 4:

as shown in figure 1, the flow rate of liquid sulfur entering the high-ammonia acid gas-sulfur combined treatment combustor is 3095.7kg/h, and the flow rate of acid gas is 10000Nm³H, volume content of each component of the acid gas, C1: 0.15 percent; c2: 0.13 percent; NH (NH)₃：12.17%；H₂S：45.86%；CO₂：37.70%；CO：0.25%；H₂O: 3.73 percent. Total air quantity 57308Nm at outlet of air fan³H, wherein the furnace end air volume is 47676Nm³H, air supply 9632Nm from the furnace³H is used as the reference value. The furnace end temperature of the incinerator is 1300 ℃, and the discharging temperature of the incinerator is 1160 ℃. Exhaust-heat boiler outletThe temperature of the smoke is 350 ℃, and the volume content, SO, of each component₂：10.19%；CO₂：5.79%；O₂：3.0%；N₂：69.27%；H₂O：11.74%。

Example 5:

as shown in figure 1, the flow rate of liquid sulfur entering the high-ammonia-content acid gas-sulfur combined treatment combustor is 4292.1kg/h, and the flow rate of acid gas is 20000Nm³H, volume content of each component of the acid gas, C1: 0.14 percent; c2: 0.13 percent; NH (NH)₃：15.07%；H₂S：36.47%；CO₂：43.94%；CO：0.24%；H₂O: 3.99 percent. Total air quantity 91569Nm at outlet of air fan³H, wherein the furnace end air volume is 78322Nm³H, 13247Nm of air supply in the furnace³H is used as the reference value. The furnace end temperature of the incinerator is 1300 ℃, and the discharging temperature of the incinerator is 1200 ℃. The temperature of the flue gas at the outlet of the waste heat boiler is 350 ℃, and the volume content, SO, of each component₂：9.40%；CO₂：8.14%；O₂：2.50%；N₂：66.99%；H₂O：12.98%。

Example 6:

as shown in figure 1, the flow rate of liquid sulfur entering the high-ammonia acid gas-sulfur combined treatment combustor is 12354.2kg/h, and the flow rate of acid gas is 50000Nm³H, volume content of each component of the acid gas, C1: 0.13 percent; c2: 0.13 percent; NH (NH)₃：28.97%；H₂S：29.20%；CO₂：36.26%；CO：0.17%；H₂O: 5.13 percent. Total air quantity 227987Nm at outlet of air fan³H, wherein the furnace end air volume is 201399Nm³H, furnace top air supplement 26588Nm³H is used as the reference value. The furnace end temperature of the incinerator is 1300 ℃, and the discharging temperature of the incinerator is 1225 ℃. The temperature of the flue gas at the outlet of the waste heat boiler is 350 ℃, and the volume content, SO, of each component₂：8.45%；CO₂：6.69%；O₂：2.0%；N₂：67.30%；H₂O：15.57%。

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.