阅读说明：本技术 一种利用锅炉含硫烟气制硫酸铵的系统和方法 (System and method for preparing ammonium sulfate by using boiler sulfur-containing flue gas ) 是由 马晓珑 张瑞祥 刘峰 胡杨 余俨 于 2021-03-03 设计创作，主要内容包括：一种利用锅炉含硫烟气制硫酸铵的系统和方法,锅炉烟道接本生反应装置,本生反应装置接供水装置、硫酸收集装置、碘化氢分解装置、反应器排气收集装置,碘化氢分解装置接氢气收集装置、碘回收装置,碘回收装置接碘供应装置、本生反应装置；反应器排气收集装置接除氧装置,除氧装置接甲烷制备装置,甲烷制备装置接甲烷存储装置、氨气制备装置,氨气制备装置接氨气存储装置、硫酸铵制备装置,硫酸铵制备装置接硫酸铵存储装置,硫酸收集装置接硫酸铵制备装置,氢气收集装置接除氧装置、甲烷制备装置、氨气制备装置,本发明基于上述系统利用氨气与硫酸反应生成硫酸铵化肥,将锅炉排放烟气全量化资源利用,能够产生良好的社会效益。(A system and method for preparing ammonium sulfate by using sulfur-containing flue gas of a boiler, wherein a flue of the boiler is connected with a Bunsen reaction device, the Bunsen reaction device is connected with a water supply device, a sulfuric acid collecting device, a hydrogen iodide decomposing device and a reactor exhaust collecting device, the hydrogen iodide decomposing device is connected with a hydrogen collecting device and an iodine recycling device, and the iodine recycling device is connected with an iodine supply device and the Bunsen reaction device; the reactor exhaust collection device is connected with the deoxidizing device, the deoxidizing device is connected with the methane preparation device, the methane preparation device is connected with the methane storage device and the ammonia preparation device, the ammonia preparation device is connected with the ammonia storage device and the ammonium sulfate preparation device, the ammonium sulfate preparation device is connected with the ammonium sulfate storage device, the sulfuric acid collection device is connected with the ammonium sulfate preparation device, and the hydrogen collection device is connected with the deoxidizing device, the methane preparation device and the ammonia preparation device.)

1. The system for preparing the ammonium sulfate by utilizing the sulfur-containing flue gas of the boiler is characterized by comprising a boiler flue (1) subjected to boiler denitration and dust removal, wherein an outlet of the boiler flue (1) is connected to a first inlet of a Bunsen reaction device (3), a second inlet of the Bunsen reaction device (3) is connected with an outlet of a water supply device (2), a first outlet of the Bunsen reaction device (3) is connected with an inlet of a sulfuric acid collecting device (4), a second outlet of the Bunsen reaction device (3) is connected with an inlet of a hydrogen iodide decomposing device (5), and a first outlet of the hydrogen iodide decomposing device (5) is connected with an inlet of a hydrogen collecting device (9); a second outlet of the hydrogen iodide decomposition device (5) is connected with a first inlet of an iodine recovery device (8), and a second inlet of the iodine recovery device (8) is connected with an outlet of an iodine supply device (16); an outlet of the iodine recovery device (8) is connected with a third inlet of the Bunsen reaction device (3), and a fourth inlet of the Bunsen reaction device (3) is connected with a third outlet of the hydrogen iodide decomposition device (5);

the third outlet of the Bunsen reactor (3) is connected with the inlet of the reactor exhaust gas collecting device (6), the outlet of the reactor exhaust gas collecting device (6) is connected with the first inlet of the deoxidizing device (7), the outlet of the deoxidizing device (7) is connected with the first inlet of the methane preparation device (10), the first outlet of the methane preparation device (10) is connected with the inlet of the methane storage device (14), the second outlet of the methane preparation device (10) is connected with the first inlet of the ammonia preparation device (11), the first outlet of the ammonia preparation device (11) is connected with the inlet of the ammonia storage device (15), the second outlet of the ammonia preparation device (11) is connected with the first inlet of the ammonium sulfate preparation device (12), the outlet of the ammonium sulfate preparation device (12) is connected with the inlet of the ammonium sulfate storage device (13), the outlet of the sulfuric acid collecting device (4) is connected with the second inlet of the ammonium sulfate preparation device (12), a first outlet of the hydrogen collecting device (9) is connected with a second inlet of the deoxidizing device (7), a second outlet of the hydrogen collecting device (9) is connected with a second inlet of the methane preparing device (10), and a third outlet of the hydrogen collecting device (9) is connected with a second inlet of the ammonia preparing device (11).

2. The system according to claim 1, characterized in that said Bunsen reaction apparatus (3) is equipped with heating and cooling means capable of adjusting its internal temperature between 0 ℃ and 130 ℃; the inside of the reactor is filled with a solution formed by sulfur dioxide, iodine and water, and the sulfur dioxide, iodine and water partially react to generate sulfuric acid and hydrogen iodide.

3. The system according to claim 1, wherein the hydrogen iodide decomposing device (5) is provided with a heating and cooling device, the temperature of the medium in the hydrogen iodide decomposing device (5) is adjusted to be 250 ℃ to 600 ℃ by the operation of the heating and cooling device, and the hydrogen iodide decomposing device (5) is further provided with a catalyst for promoting the decomposition into hydrogen gas and iodine.

4. A system according to claim 1, characterized in that the oxygen removal device (7) is provided with a burner.

5. The system for producing ammonium sulfate with boiler sulfur-containing flue gas as claimed in claim 1, wherein the methane preparation device (10) is internally provided with a heating and cooling device, and the temperature of the medium in the methane preparation device (10) is adjusted to be between 250 ℃ and 600 ℃.

6. The system according to claim 1, wherein the methane production plant (10) is equipped with a compressor for increasing the pressure of the medium entering the methane production plant (10) to 10 MPa.

7. The system of claim 1, wherein the methane production apparatus (10) is provided with a catalyst, and the carbon dioxide and hydrogen entering the methane production apparatus (10) are used for producing methane under the action of the catalyst.

8. A method for producing ammonium sulfate using the system as claimed in any one of claims 1 to 7, including the steps of:

(1) adding water into the Bunsen reaction device (3) by the water supply device (2), wherein the liquid level reaches the normal water level of the Bunsen reaction device (3);

(2) and the iodine supply device (16) supplies iodine: water 1: 1.4 molar ratio of iodine;

(3) the flue gas coming from the boiler flue (1) after denitration and dust removal is introduced into a Bunsen reaction device (3), and the main components of the flue gas are as follows: nitrogen, carbon dioxide, oxygen, sulfur dioxide;

(4) sulfur dioxide, water and iodine partially react in the Bunsen reaction device (3) to generate hydrogen iodide and sulfuric acid, the sulfuric acid enters a sulfuric acid collecting device (4), and the hydrogen iodide enters a hydrogen iodide separator (5);

(5) the hydrogen iodide entering a hydrogen iodide separator (5) is partially decomposed into hydrogen and iodine at the temperature of over 300 ℃ under the action of a catalyst, the iodine enters an iodine recovery device (8), the hydrogen enters a hydrogen collecting device (9), and the undecomposed hydrogen iodide returns to a Bunsen reaction device (3) to participate in the next reaction;

(6) the gas discharged from the Bunsen reaction device (3) enters a reactor exhaust collecting device (6), and the main components of the gas comprise nitrogen, carbon dioxide and oxygen;

(7) oxygen in the gas discharged from the reactor exhaust gas collecting device (6) and hydrogen discharged from the hydrogen collecting device (9) are combusted in the oxygen removing device (7), the oxygen is consumed, and heat is generated to heat the gas;

(8) the gas discharged from the oxygen removing device (7) enters a methane preparation device (10), the main components of the gas comprise nitrogen and carbon dioxide, the carbon dioxide and the hydrogen from the hydrogen collecting device (9) are subjected to chemical reaction to generate methane, and the generated methane is stored in a methane storage device (14);

(9) the gas discharged from the methane preparation device (10) enters an ammonia gas preparation device (11), the main component of the gas is nitrogen, the nitrogen and the hydrogen from the hydrogen gas collection device (9) are subjected to chemical reaction to form ammonia gas, and the formed ammonia gas can be stored in an ammonia gas storage device (15) according to the requirement;

(10) and the ammonia gas generated in the ammonia gas preparation device (11) enters an ammonium sulfate preparation device (12) and is chemically reacted with the sulfuric acid from the sulfuric acid collection device (4) to generate ammonium sulfate, and the generated ammonium sulfate is stored in an ammonium sulfate storage device (13).

Technical Field

The invention belongs to the technical field of ammonium sulfate preparation, and particularly relates to a system and a method for preparing ammonium sulfate by using boiler sulfur-containing flue gas.

Background

The main components of the general boiler flue gas are nitrogen, carbon dioxide, sulfur dioxide and water vapor. The volume ratio of the flue gas of a 1000MW boiler mainly comprises: about 73% of nitrogen, about 12% of carbon dioxide, about 8% of water vapor, about 5% of oxygen and about 0.1% of sulfur dioxide. Therefore, sulfur dioxide in boiler flue gas is one of the main pollution sources of the atmosphere, and carbon dioxide is the main greenhouse gas. The reduced emissions of these two gases are a major problem facing power production.

At present, most of boiler flue gas desulfurization adopts the method that flue gas is introduced into calcium carbonate, calcium carbonate and sulfur dioxide react to generate calcium sulfate and carbon dioxide, and the desulfurization method removes the sulfur dioxide in the boiler flue gas, but increases the emission of greenhouse gas carbon dioxide.

The hydrogen production by adopting the sulfur-iodine cycle high-temperature hydrolysis needs the high temperature above 850 ℃, the sulfuric acid is pyrolyzed into sulfur dioxide, the water, the sulfur dioxide and the iodine generate hydrogen iodide at the normal temperature, and the hydrogen iodide is decomposed into iodine and hydrogen at the temperature above 300 ℃. The difficulty of the process is that:

(1) the high temperature of 850 ℃ required for pyrolyzing the sulfuric acid is difficult to meet;

(2) sulfuric acid is a very corrosive substance, and a material capable of resisting high-temperature corrosion is very expensive;

(3) the hydrogen production by pyrolysis of sulfuric acid is less economical.

Disclosure of Invention

Aiming at the problems of hydrogen production by high-temperature hydrolysis and combustion of sulfur-containing coal at present, the invention aims to provide a system and a method for preparing ammonium sulfate by using boiler sulfur-containing flue gas, sulfur dioxide is obtained without high-temperature pyrolysis of sulfuric acid, ammonium gas and sulfuric acid are reacted to generate ammonium sulfate fertilizer, and the boiler exhaust flue gas is fully utilized to generate good social benefits.

The invention is realized by adopting the following technical scheme:

a system for preparing ammonium sulfate by utilizing sulfur-containing flue gas of a boiler comprises a boiler flue 1 after boiler denitration and dust removal, wherein an outlet of the boiler flue 1 is connected to a first inlet of a Bunsen reaction device 3, a second inlet of the Bunsen reaction device 3 is connected with an outlet of a water supply device 2, a first outlet of the Bunsen reaction device 3 is connected with an inlet of a sulfuric acid collecting device 4, a second outlet of the Bunsen reaction device 3 is connected with an inlet of a hydrogen iodide decomposing device 5, and a first outlet of the hydrogen iodide decomposing device 5 is connected with an inlet of a hydrogen collecting device 9; a second outlet of the hydrogen iodide decomposition device 5 is connected with a first inlet of the iodine recovery device 8, and a second inlet of the iodine recovery device 8 is connected with an outlet of the iodine supply device 16; an outlet of the iodine recovery device 8 is connected with a third inlet of the Bunsen reaction device 3, and a fourth inlet of the Bunsen reaction device 3 is connected with a third outlet of the hydrogen iodide decomposition device 5;

the third outlet of the Bunsen reaction device 3 is connected with the inlet of the reactor exhaust gas collecting device 6, the outlet of the reactor exhaust gas collecting device 6 is connected with the first inlet of the deoxidizing device 7, the outlet of the deoxidizing device 7 is connected with the first inlet of the methane preparing device 10, the first outlet of the methane preparing device 10 is connected with the inlet of the methane storing device 14, the second outlet of the methane preparing device 10 is connected with the first inlet of the ammonia preparing device 11, the first outlet of the ammonia preparing device 11 is connected with the inlet of the ammonia storing device 15, the second outlet of the ammonia preparing device 11 is connected with the first inlet of the ammonium sulfate preparing device 12, the outlet of the ammonium sulfate preparing device 12 is connected with the inlet of the ammonium sulfate storing device 13, the outlet of the sulfuric acid collecting device 4 is connected with the second inlet of the ammonium sulfate preparing device 12, the first outlet of the hydrogen collecting device 9 is connected with the second inlet of the deoxidizing device, a second outlet of the hydrogen collecting device 9 is connected with a second inlet of the methane preparation device 10, and a third outlet of the hydrogen collecting device 9 is connected with a second inlet of the ammonia preparation device 11.

The Bunsen reaction device 3 is provided with a heating and cooling device, and the internal temperature of the Bunsen reaction device can be adjusted between 0 ℃ and 130 ℃; the inside of the reactor is filled with a solution formed by sulfur dioxide, iodine and water, and the sulfur dioxide, iodine and water partially react to generate sulfuric acid and hydrogen iodide.

The hydrogen iodide decomposition device 5 is internally provided with a heating and cooling device, the temperature of a medium in the hydrogen iodide decomposition device 5 is adjusted to be between 250 ℃ and 600 ℃ through the work of the heating and cooling device, and the hydrogen iodide decomposition device 5 is also internally provided with a catalyst for promoting the decomposition into hydrogen and iodine.

A burner is arranged in the oxygen removing device 7.

The methane preparation device 10 is internally provided with a heating and cooling device, and the temperature of a medium in the methane preparation device 10 is adjusted to be between 250 ℃ and 600 ℃.

A compressor is arranged in the methane preparation device 10, and the pressure of a medium entering the methane preparation device 10 is increased to 10 MPa.

The methane preparation device 10 is internally provided with a catalyst, and carbon dioxide and hydrogen entering the methane preparation device 10 generate methane under the action of the catalyst.

The method for preparing the ammonium sulfate based on the system is characterized by comprising the following steps:

(1) adding water into the Bunsen reaction device 3 by the water supply device 2, wherein the liquid level reaches the normal water level of the Bunsen reaction device 3;

(2) the reaction apparatus 3 is supplied with iodine from an iodine supply apparatus 16 as follows: water 1: 1.4 molar ratio of iodine;

(3) the flue gas coming from the boiler flue 1 after denitration and dust removal is introduced into the Bunsen reaction device 3, and the main components of the flue gas comprise: nitrogen, carbon dioxide, oxygen, sulfur dioxide;

(4) sulfur dioxide, water and iodine are subjected to chemical reaction in the middle of the Bunsen reaction device 3 to generate hydrogen iodide and sulfuric acid, the sulfuric acid enters a sulfuric acid collecting device 4, and the hydrogen iodide enters a hydrogen iodide separator 5;

(5) the hydrogen iodide entering the hydrogen iodide separator 5 is partially decomposed into hydrogen and iodine at the temperature of over 300 ℃ under the action of a catalyst, the iodine enters the iodine recovery device 8, the hydrogen enters the hydrogen collecting device 9, and the undecomposed hydrogen iodide returns to the Bunsen reaction device 3 to participate in the next reaction;

(6) the gas discharged from the Bunsen reactor 3 enters a reactor exhaust collecting device 6, and the main components of the gas comprise nitrogen, carbon dioxide and oxygen;

(7) oxygen in the gas discharged from the reactor exhaust gas collecting device 6 and hydrogen discharged from the hydrogen collecting device 9 are combusted in the oxygen removing device 7, the oxygen is consumed, and meanwhile heat is generated to heat the gas;

(8) the gas discharged from the oxygen removing device 7 enters a methane preparation device 10, the main components of the gas comprise nitrogen and carbon dioxide, the carbon dioxide and the hydrogen from the hydrogen collecting device 9 are subjected to chemical reaction to generate methane, and the generated methane is stored in a methane storage device 14;

(9) the gas discharged from the methane preparation device 10 enters an ammonia gas preparation device 11, the main component of the gas is nitrogen, the nitrogen and the hydrogen from the hydrogen gas collection device 9 are subjected to chemical reaction to form ammonia gas, and the formed ammonia gas can be stored in an ammonia gas storage device 15 according to the requirement;

(10) the ammonia gas generated in the ammonia gas production apparatus 11 enters the ammonium sulfate production apparatus 12, and chemically reacts with the sulfuric acid from the sulfuric acid collection apparatus 4 to generate ammonium sulfate, and the generated ammonium sulfate is stored in the ammonium sulfate storage apparatus 13.

The system and the method for preparing the ammonium sulfate by using the sulfur-containing flue gas of the boiler have the following obvious advantages in the aspects:

(1) sulfur dioxide is obtained without high-temperature pyrolysis of sulfuric acid, so that the difficulty of high-temperature pyrolysis hydrogen production is solved;

(2) the energy consumption in the hydrogen production process is less, the emission temperature of the boiler flue gas is suitable for the generation temperature of the hydrogen iodide, no extra measures are needed, and the temperature required by the decomposition of the hydrogen iodide is easily obtained in a power plant, for example, the temperature is obtained by heating with steam;

(3) raw materials required by hydrogen production are derived from polluted waste gas discharged by a boiler, so that the hydrogen production cost is low;

(4) the sulfur dioxide in the flue gas is removed by hydrogen production, the emission of greenhouse gas carbon dioxide is not increased, and the social benefit is good;

(5) the sulfuric acid generated by hydrogen production can be comprehensively utilized, and the economic benefit is good;

(6) the produced hydrogen can be used for reacting with carbon dioxide in the flue gas to prepare methane, so that the emission of greenhouse gases is reduced;

(7) the produced hydrogen can be used for reacting with nitrogen in the flue gas to prepare the industrial common raw material ammonia gas, so that the economic benefit is better;

(8) the ammonium sulfate fertilizer is generated by the reaction of ammonia gas and sulfuric acid, so that the flue gas discharged by the boiler is utilized in a full-scale resource manner, and good social benefits are generated.

Drawings

FIG. 1 is a block diagram of the present invention.

Detailed Description

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

Referring to fig. 1, a system for preparing ammonium sulfate by using sulfur-containing flue gas of a boiler comprises a boiler flue 1 after denitration and dust removal of the boiler, wherein an outlet of the boiler flue 1 is connected to a first inlet of a Bunsen reaction device 3, a second inlet of the Bunsen reaction device 3 is connected with an outlet of a water supply device 2, a first outlet of the Bunsen reaction device 3 is connected with an inlet of a sulfuric acid collecting device 4, a second outlet of the Bunsen reaction device 3 is connected with an inlet of a hydrogen iodide decomposing device 5, and a first outlet of the hydrogen iodide decomposing device 5 is connected with an inlet of a hydrogen gas collecting device 9; a second outlet of the hydrogen iodide decomposition device 5 is connected with a first inlet of the iodine recovery device 8, and a second inlet of the iodine recovery device 8 is connected with an outlet of the iodine supply device 16; an outlet of the iodine recovery device 8 is connected with a third inlet of the Bunsen reaction device 3, and a fourth inlet of the Bunsen reaction device 3 is connected with a third outlet of the hydrogen iodide decomposition device 5;

the third outlet of the Bunsen reaction device 3 is connected with the inlet of the reactor exhaust gas collecting device 6, the outlet of the reactor exhaust gas collecting device 6 is connected with the first inlet of the deoxidizing device 7, the outlet of the deoxidizing device 7 is connected with the first inlet of the methane preparing device 10, the first outlet of the methane preparing device 10 is connected with the inlet of the methane storing device 14, the second outlet of the methane preparing device 10 is connected with the first inlet of the ammonia preparing device 11, the first outlet of the ammonia preparing device 11 is connected with the inlet of the ammonia storing device 15, the second outlet of the ammonia preparing device 11 is connected with the first inlet of the ammonium sulfate preparing device 12, the outlet of the ammonium sulfate preparing device 12 is connected with the inlet of the ammonium sulfate storing device 13, the outlet of the sulfuric acid collecting device 4 is connected with the second inlet of the ammonium sulfate preparing device 12, the first outlet of the hydrogen collecting device 9 is connected with the second inlet of the deoxidizing device, a second outlet of the hydrogen collecting device 9 is connected with a second inlet of the methane preparation device 10, and a third outlet of the hydrogen collecting device 9 is connected with a second inlet of the ammonia preparation device 11.

The Bunsen reaction device 3 is provided with a heating and cooling device, and the internal temperature of the Bunsen reaction device can be adjusted between 0 ℃ and 130 ℃; the inside of the reactor is filled with a solution formed by sulfur dioxide, iodine and water, and the sulfur dioxide, iodine and water partially react to generate sulfuric acid and hydrogen iodide.

The hydrogen iodide decomposition device 5 is internally provided with a heating and cooling device, the temperature of a medium in the hydrogen iodide decomposition device 5 is adjusted to be between 250 ℃ and 600 ℃ through the work of the heating and cooling device, and the hydrogen iodide decomposition device 5 is also internally provided with a catalyst for promoting the decomposition into hydrogen and iodine.

A burner is arranged in the oxygen removing device 7.

The methane preparation device 10 is internally provided with a heating and cooling device, and the temperature of a medium in the methane preparation device 10 is adjusted to be between 250 ℃ and 600 ℃.

A compressor is arranged in the methane preparation device 10, and the pressure of a medium entering the methane preparation device 10 is increased to 10 MPa.

The methane preparation device 10 is internally provided with a catalyst, and carbon dioxide and hydrogen entering the methane preparation device 10 generate methane under the action of the catalyst.

The method for preparing the ammonium sulfate based on the system is characterized by comprising the following steps:

(1) adding water into the Bunsen reaction device 3 by the water supply device 2, wherein the liquid level reaches the normal water level of the Bunsen reaction device 3;

(2) the reaction apparatus 3 is supplied with iodine from an iodine supply apparatus 16 as follows: water 1: 1.4 molar ratio of iodine;

(3) the flue gas coming from the boiler flue 1 after denitration and dust removal is introduced into the Bunsen reaction device 3, and the main components of the flue gas comprise: nitrogen, carbon dioxide, oxygen, sulfur dioxide;

(4) sulfur dioxide, water and iodine are subjected to chemical reaction in the middle of the Bunsen reaction device 3 to generate hydrogen iodide and sulfuric acid, the sulfuric acid enters a sulfuric acid collecting device 4, and the hydrogen iodide enters a hydrogen iodide separator 5;

(5) the hydrogen iodide entering the hydrogen iodide separator 5 is partially decomposed into hydrogen and iodine at the temperature of over 300 ℃ under the action of a catalyst, the iodine enters the iodine recovery device 8, the hydrogen enters the hydrogen collecting device 9, and the undecomposed hydrogen iodide returns to the Bunsen reaction device 3 to participate in the next reaction;

(6) the gas discharged from the Bunsen reactor 3 enters a reactor exhaust collecting device 6, and the main components of the gas comprise nitrogen, carbon dioxide and oxygen;

(7) oxygen in the gas discharged from the reactor exhaust gas collecting device 6 and hydrogen discharged from the hydrogen collecting device 9 are combusted in the oxygen removing device 7, the oxygen is consumed, and meanwhile heat is generated to heat the gas;

(8) the gas discharged from the oxygen removing device 7 enters a methane preparation device 10, the main components of the gas comprise nitrogen and carbon dioxide, the carbon dioxide and the hydrogen from the hydrogen collecting device 9 are subjected to chemical reaction to generate methane, and the generated methane is stored in a methane storage device 14;

(9) the gas discharged from the methane preparation device 10 enters an ammonia gas preparation device 11, the main component of the gas is nitrogen, the nitrogen and the hydrogen from the hydrogen gas collection device 9 are subjected to chemical reaction to form ammonia gas, and the formed ammonia gas can be stored in an ammonia gas storage device 15 according to the requirement;

(10) the ammonia gas generated in the ammonia gas production apparatus 11 enters the ammonium sulfate production apparatus 12, and chemically reacts with the sulfuric acid from the sulfuric acid collection apparatus 4 to generate ammonium sulfate, and the generated ammonium sulfate is stored in the ammonium sulfate storage apparatus 13.

Effects of the embodiment

The volume ratio of the flue gas of a 1000MW boiler mainly comprises: 73.28% of nitrogen, 12.67% of carbon dioxide, 8.37% of water vapor, 5.4% of oxygen and 0.1% of sulfur dioxide.

After the boiler flue gas enters the Bunsen reaction device 3, sulfur dioxide in the flue gas reacts with water and iodine to generate HI and sulfuric acid. The HI enters a hydrogen iodide decomposition device 5 to generate hydrogen and iodine, the iodine returns to the Bunsen reaction device 3 for reuse, and the hydrogen enters a hydrogen collection device 9.

In the Bunsen reaction apparatus 3, the generated sulfuric acid enters a sulfuric acid collecting apparatus 4.

Theoretically, the flue gas of the 1000MW boiler contains 9500kg/h of sulfur dioxide and can produce 77000m of hydrogen³(ii)/d, value of about 77 ten-thousand yuan; can produce high-purity sulfuric acid 340t/d with the value of about 17 ten thousand yuan.

The main components of the gas from the Bunsen reaction device 3 are nitrogen, carbon dioxide and oxygen; a part of the hydrogen is taken out from the hydrogen collecting device 9, and oxygen is consumed by combustion in the oxygen removing device 7, and simultaneously heat is generated to heat the gas.

The gas discharged from the oxygen removing device 7, mainly nitrogen gas and carbon dioxide, is introduced into the methane production device 10, and in the methane production device 10, the carbon dioxide is combined with the hydrogen gas from the hydrogen gas collecting device (9) to produce methane, which is introduced into the methane storage device 14.

The gas discharged from the methane production apparatus 10 is mainly nitrogen gas, which reacts with the hydrogen gas from the hydrogen collection apparatus 9 in the ammonia gas production apparatus 11 to produce ammonia gas.

The generated ammonia gas can be stored in an ammonia gas storage device 15 to form industrial products, and can also be used for generating ammonium sulfate fertilizer in an ammonium sulfate preparation device 12 together with the sulfuric acid discharged from the sulfuric acid collecting device 4.

Therefore, the flue gas generated in the boiler can be utilized in a full-scale manner, and good economic benefit and social benefit are generated.