Acid making system capable of co-producing sulfur and treating Claus sulfur making tail gas

Abstract

The utility model provides an acid making system capable of co-producing sulfur and treating Claus sulfur making tail gas, which comprises a first acid gas pipeline, a second acid gas pipeline, a combustion unit, a Claus reaction unit, an incineration unit, an SO2 catalytic oxidation reactor, an SCR (Selective Catalytic Reduction) denitration reactor and a sulfuric acid condenser, the combustion unit is connected with the Claus reaction unit, the Claus reaction unit is connected with the SO2 catalytic oxidation reactor, the SO2 catalytic oxidation reactor and the second acid gas pipeline are connected with the incineration unit, the incineration unit is connected with the SCR denitration reactor, the SCR denitration reactor is connected with the SO2 catalytic oxidation reactor, and the SO2 catalytic oxidation reactor is connected with the second acid gas pipeline. And the SO2 catalytic oxidation reactor is connected with the sulfuric acid condenser. According to the device, sulfur can be recycled through the Claus reaction unit, tail gas produced by the Claus reaction unit can be further converted into sulfuric acid through the incineration unit, the SO2 catalytic oxidation reactor and the sulfuric acid condenser, and the amount of discharged SO2 can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the chemical industry field of recycling hydrogen sulfide in sour gas, and specifically relates to an acid making system capable of co-producing sulfur and treating Claus sulfur making tail gas. BACKGROUND

[0002] The conventional Claus device is used for treating the H2S-containing sour gas byproduct of coal chemical industry, petroleum chemical industry and the like to produce sulfur byproduct for external delivery and collection for reuse, and the tail gas is treated by incineration and post desulfurization process to convert SO2 in the incinerated flue gas into salt-containing wastewater or gypsum and the like, thereby wasting part of S and increasing the operation cost of enterprises due to the operation of the desulfurization device.

[0003] The Claus tail gas is treated by the acid making device to recover S therefrom and convert it into H2SO4, which can effectively reduce the amount of SO2 discharged and the operation pressure and cost of the subsequent desulfurization system.

[0004] The current sulfur recovery of coal chemical industry and petroleum chemical industry devices can only produce sulfur or sulfuric acid products, which cannot effectively utilize sulfur elements and causes resource waste. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model aims to provide an acid making system capable of co-producing sulfur and treating Claus sulfur making tail gas to solve the problem that the current sulfur recovery of coal chemical industry and petroleum chemical industry devices can only produce sulfur or sulfuric acid products, which cannot effectively utilize sulfur elements and causes resource waste.

[0006] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] An acid production system capable of co-production of sulfur and capable of treating Claus sulfur tail gas, comprising a first acid gas pipeline, a second acid gas pipeline, a combustion unit, a Claus reaction unit, a incineration unit, a SO2 catalytic oxidation reactor, an SCR denitration reactor, a sulfuric acid condenser, the combustion unit is connected with the Claus reaction unit, the Claus reaction unit is connected with the SO2 catalytic oxidation reactor, the SO2 catalytic oxidation reactor, the second acid gas pipeline and the incineration unit are connected, the incineration unit is connected with the SCR denitration reactor, the SCR denitration reactor is connected with the SO2 catalytic oxidation reactor, the SO2 catalytic oxidation reactor is connected with the sulfuric acid condenser.

[0008] In this arrangement, through the Claus reaction unit, sulfur can be recovered, through the SO2 catalytic oxidation reactor and the sulfuric acid condenser, the remaining SO2 can be further converted into sulfuric acid, this co-production can improve the utilization rate of sulfur element, reduce resource waste, and also reduce environmental pollution, in addition, in the present application, by arranging the first acid gas pipeline and the second acid gas pipeline, the SO2 content entering the SO2 catalytic oxidation reactor can be adjusted, so that the bed temperature of the SO2 catalytic oxidation reactor is constant, and the efficiency of the SO2 catalytic oxidation to SO3 is ensured.

[0009] Further, the gas inlet of the first acid gas pipeline is connected with the gas inlet of the combustion unit, the gas outlet of the combustion unit is connected with the gas inlet of the Claus reaction unit, the gas outlet of the Claus reaction unit is connected with the first gas inlet of the SO2 catalytic oxidation reactor, the first gas outlet of the SO2 catalytic oxidation reactor and the gas inlet of the second acid gas pipeline are connected with the gas inlet of the incineration unit, the gas outlet of the incineration unit is connected with the gas inlet of the SCR denitration reactor, the gas outlet of the SCR denitration reactor is connected with the second gas inlet of the SO2 catalytic oxidation reactor, and the second gas outlet of the SO2 catalytic oxidation reactor is connected with the sulfuric acid condenser.

[0010] Further, the first gas outlet and the second gas outlet are located at the side end of the SO2 catalytic oxidation reactor, the second gas inlet is located at the upper end of the SO2 catalytic oxidation reactor, and the second gas outlet is located at the lower end of the SO2 catalytic oxidation reactor.

[0011] Further, the combustion unit comprises a combustion furnace burner, a combustion furnace and a first steam generator connected in sequence, the first acid gas pipeline is connected with the combustion furnace burner, and the first steam generator is connected with the Claus reaction unit.

[0012] Further, the incineration unit comprises a incineration furnace burner, a incineration furnace and a second steam generator connected in sequence, the first gas outlet of the SO2 catalytic oxidation reactor is connected with the gas inlet of the incineration furnace, and the gas inlet of the second acid gas pipeline is connected with the gas inlet of the incineration furnace burner.

[0013] Further, the Claus reaction unit comprises a first-stage sulfur condenser, a first-stage reheater, a first-stage catalytic reactor, a second-stage sulfur condenser, a second-stage reheater, a second-stage catalytic reactor, a third-stage sulfur condenser, a third-stage reheater, a third-stage catalytic reactor, and a fourth-stage sulfur condenser connected in sequence, the first-stage sulfur condenser is connected with the combustion unit, and the gas outlet of the fourth-stage sulfur condenser is connected with the first gas inlet of the SO2 catalytic oxidation reactor.

[0014] The arrangement can improve the recovery rate of sulfur and reduce tail gas emissions.

[0015] Further, an H2S / SO2 ratio instrument is arranged on the connecting channel between the Claus reaction unit and the SO2 catalytic oxidation reactor. An O2 content analyzer is arranged on the connecting pipeline between the incineration unit and the acid production unit.

[0016] The arrangement of the acid gas ratio instrument is used to detect the H2S / SO2 content, and the O2 content analyzer is used to detect the O2 content. The purpose is to control the ratio of oxygen and SO2 entering the SO2 catalytic oxidation reactor to be a certain proportion, which is 2-2.5, to ensure that the bed temperature of the SO2 catalytic oxidation reactor is constant.

[0017] Further, the SO2 catalytic oxidation reactor is provided with multiple layers of catalyst beds and multiple layers of heat exchange sections.

[0018] Further, the burner of the incinerator comprises a gas gun, an acid gas pipe, an air cavity, a furnace cavity, a fire basin brick, and a shell. The acid gas pipe surrounds the outside of the gas gun. An air swirler is arranged on the end of the acid gas pipe close to the furnace cavity. The air cavity is located between the shell, the acid gas pipe, and the fire basin brick. The fire basin brick surrounds the outside of the air swirler. An air distribution ring pipe is arranged on the fire basin brick and communicates with the furnace cavity.

[0019] The air swirler in the arrangement realizes the first entry of air. The air swirler allows the first air entering the furnace cavity to be accurately calculated, avoids the influence of excessive air on the flame stability of the burner when the operation of the burner is unstable or the operation load is low, ensures the stability of the combustion of the burner, reduces the oxygen content in the central flame area, and plays a role in reducing nitrogen oxides. The air distribution ring pipe in the fire basin brick realizes the second entry of air. The second air entering the furnace cavity provides sufficient excess air for the combustion of combustible substances and plays a role in reducing the high-temperature flue gas generated by flame combustion, thereby protecting the flue.

[0020] Further, the gas gun is provided with a first fuel gas inlet and a second fuel gas inlet. The acid gas pipe is provided with an acid gas inlet. The shell is provided with a combustion-supporting air inlet.

[0021] Compared with the prior art, the acid making system capable of co-producing sulfur and treating Claus sulfur production tail gas has the following advantages:

[0022] 1) The utility model discloses a sulfur and sulfuric acid co-production, sulfur waste gas emission reduction, gas flow optimization and system structure etc.

[0023] 2) The utility model discloses a Claus reaction unit, can recycle sulfur, through SO2 Catalytic Oxidation Reactor and sulfuric acid condenser, can further convert the residual SO2 into sulfuric acid, this co-production can improve the utilization rate of sulfur element, reduce resource waste, also reduce environmental pollution.

[0024] 3) The air cyclone of the utility model, realize primary air entering, and the primary air entering the furnace cavity can be accurately calculated by the air cyclone, avoid the influence of too much air on the flame stability of the burner when the burner operation is unstable or the operation load is low, ensure the stability of the burner combustion, reduce the oxygen content of the central flame area, reduce the nitrogen oxide, realize secondary air entering through the air distribution ring pipe in the fire basin brick, the secondary air entering the furnace cavity provides sufficient excess air for the combustible material combustion, and plays the role of high-temperature flue gas cooling generated by flame combustion, and protects the fire channel.

[0025] 4) The utility model discloses a Claus reaction unit tail gas is sent to SO2 Catalytic Oxidation Reactor, utilizes the high-temperature gas of SO2 Catalytic Oxidation Reactor one section reaction bed layer and preheats the tail gas of Claus reaction unit, and the tail gas of Claus reaction unit after preheating enters the incinerator again, and the furnace temperature is kept relatively stable when the load fluctuates, and fuel gas consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a kind of acid making system capable of co-production sulfur and handling the tail gas of Claus sulfur production of the utility model;

[0027] Figure 2 It is the structure diagram of the burner for incinerator of the utility model Figure One .

[0028] Figure 3 It is the structure diagram of the burner for incinerator of the utility model Figure Two .

[0029] REFERENCE SIGNS:

[0030] 1 - first acid gas pipeline, 2 - second acid gas pipeline, 3 - combustion unit, 31 - combustion furnace burner, 32 - combustion furnace, 33 - first steam generator, 4 - Claus reaction unit, 40 - first stage sulfur condenser, 41 - first stage reheater, 42 - first stage catalytic reactor, 43 - second stage sulfur condenser, 44 - second stage reheater, 45 - second stage catalytic reactor, 46 - third stage sulfur condenser, 47 - third stage reheater, 48 - third stage catalytic reactor, 49 - fourth stage sulfur condenser, 491 - H2S / SO2 ratio instrument, 5 - incineration unit, 51 - incineration furnace burner, 52 - incineration furnace, 521 - gas gun, 5211 - first fuel gas inlet, 5212 - second fuel gas inlet, 522 - acid gas pipe, 5221 - acid gas inlet, 523 - air cavity, 5231 - combustion air inlet, 524 - furnace cavity, 525 - fire hearth brick, 5251 - air distribution ring tube, 526 - shell, 527 - air cyclone, 53 - second steam generator, 531 - O2 content analyzer, 6 - SO2 catalytic oxidation reactor, 7 - SCR denitration reactor, 8 - sulfuric acid condenser. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings.

[0032] As Figures 1-2 shown, the present application relates to an acid-making system capable of co-producing sulfur and treating Claus sulfur-making tail gas, comprising a first acid gas pipeline 1, a second acid gas pipeline 2, a combustion unit 3, a Claus reaction unit 4, an incineration unit 5, an SO2 catalytic oxidation reactor 6, an SCR denitration reactor 7, and a sulfuric acid condenser 8, wherein the first acid gas pipeline 1 is connected with the combustion unit 3, the combustion unit 3 is connected with the Claus reaction unit 4, the Claus reaction unit 4 is connected with the SO2 catalytic oxidation reactor 6, the SO2 catalytic oxidation reactor 6 and the second acid gas pipeline 2 are connected with the incineration unit 5, the incineration unit 5 is connected with the SCR denitration reactor 7, the SCR denitration reactor 7 is connected with the SO2 catalytic oxidation reactor 6, and the SO2 catalytic oxidation reactor 6 is connected with the sulfuric acid condenser 8, wherein SCR is the abbreviation of Selective Catalytic Reduction.

[0033] In the setting, sulfur can be recovered through the Claus reaction unit, and the tail gas produced by the Claus reaction unit can be further converted into sulfuric acid through the SO2 catalytic oxidation reactor and the sulfuric acid condenser, which can effectively reduce the amount of SO2 discharged, reduce the operating pressure and operating cost of the subsequent desulfurization system, and timely adjust the operating load of the Claus furnace reaction unit and the acid making device according to the production load of the plant and the market situation of S / H2SO4, increase the flexibility of device operation and the diversity of products, and the setting of the first acid gas pipeline and the second acid gas pipeline is also conducive to adjusting the SO2 gas content entering the SO2 catalytic oxidation reactor, and ensuring the SO2 catalytic oxidation reaction efficiency. The tail gas of the Claus reaction unit enters the incinerator after heat exchange in the SO2 catalytic oxidation reactor, the furnace temperature remains relatively stable when the load fluctuates, and the fuel gas consumption is reduced. The cogeneration of the utility model can improve the utilization rate of sulfur element, reduce resource waste, and also reduce environmental pollution.

[0034] Specifically, the gas inlet of the first acid gas pipeline 1 is connected with the gas inlet of the combustion unit 3, the gas outlet of the combustion unit 3 is connected with the gas inlet of the Claus reaction unit 4, the gas outlet of the Claus reaction unit 4 is connected with the first gas inlet of the SO2 catalytic oxidation reactor 6, the first gas outlet of the SO2 catalytic oxidation reactor 6 and the gas inlet of the second acid gas pipeline 2 are both connected with the gas inlet of the incineration unit 5, the gas outlet of the incineration unit 5 is connected with the gas inlet of the SCR denitration reactor 7, the gas outlet of the SCR denitration reactor 7 is connected with the second gas inlet of the SO2 catalytic oxidation reactor 6, and the second gas outlet of the SO2 catalytic oxidation reactor 6 is connected with the sulfuric acid condenser 8.

[0035] Specifically, the SO2 catalytic oxidation reactor is provided with a plurality of catalyst bed layers and a plurality of heat exchange sections. Preferably, the SO2 catalytic oxidation reactor is provided with 2 layers of catalyst bed layers and 2 layers of heat exchange sections.

[0036] More specifically, the first gas outlet and the second gas outlet are located at the side end of the SO2 catalytic oxidation reactor, the second gas inlet is located at the upper end of the SO2 catalytic oxidation reactor, and the second gas outlet is located at the lower end of the SO2 catalytic oxidation reactor.

[0037] Specifically, the combustion unit 3 comprises a combustion furnace burner 31, a combustion furnace 32 and a first steam generator 33 connected in sequence, the first acid gas pipeline 1 is connected with the combustion furnace burner 31, and the first steam generator 32 is connected with the Claus reaction unit.

[0038] Specifically, an O2 content analyzer 531 is arranged on the connecting pipeline of the incineration unit 5 and the SCR denitration reactor 7.

[0039] Specifically, the incineration unit 5 comprises, in sequence, an incineration burner nozzle 51, an incineration furnace 52, and a second steam generator 53. The first gas outlet of the SO2 catalytic oxidation reactor is connected to the gas inlet of the incineration furnace, and the gas inlet of the second acid gas pipeline is connected to the gas inlet of the incineration burner nozzle.

[0040] Preferably, the O2 content analyzer 531 is located on the pipeline connecting the second steam generator 53 and the SCR denitration reactor 7.

[0041] The O2 content analyzer is arranged to detect the O2 content, so as to control the ratio of oxygen to SO2 entering the SO2 catalytic oxidation reactor to be 2-2.5, and ensure the constant bed temperature of the SO2 catalytic oxidation reactor.

[0042] Specifically, the incineration furnace 52 comprises a burner including a gas gun 521, an acid gas pipeline 522, an air cavity 523, a furnace cavity 524, a hearth brick 525, and a shell 526. The acid gas pipeline 522 surrounds the outside of the gas gun 521. An air swirler 527 is arranged on the end of the acid gas pipeline 522 close to the furnace cavity. The air swirler can enable air to enter the furnace cavity 524. The air cavity is located between the shell, the acid gas pipeline, and the hearth brick. The hearth brick surrounds the outside of the air swirler. An air distribution ring pipe 5251 is arranged on the hearth brick 525 and communicates with the furnace cavity, so as to shunt the air in the air cavity 523.

[0043] The air swirler in the arrangement enables the primary air to enter. The primary air provides combustion-supporting air for fuel gas / acid gas / liquid sulfur combustion. The air swirler enables the primary air entering the furnace cavity to be accurately calculated, avoids the influence of excessive air on the flame stability of the burner when the operation of the burner is unstable or the operation load is low, ensures the stability of the combustion of the burner, reduces the oxygen content in the central flame zone, and reduces nitrogen oxides. The air distribution ring pipe in the hearth brick enables the secondary air to enter the furnace cavity more uniformly, provides sufficient excess air for the combustion of combustible substances, and plays a role in reducing the high-temperature flue gas generated by the flame combustion, thereby protecting the flue.

[0044] More specifically, the gas gun 521 is provided with a first fuel gas inlet 5211 and a second fuel gas inlet 5212. The acid gas pipeline 522 is provided with an acid gas inlet 5221. The shell 526 is provided with a combustion-supporting air inlet 5231.

[0045] Specifically, a sulfur tail gas inlet is arranged on the furnace body of the incineration furnace. The sulfur tail gas inlet is arranged at the front part of the incineration furnace and is provided with an annular distribution port, so as to ensure that the tail gas can be uniformly distributed and fully combusted in the incineration furnace.

[0046] Specifically, the H2S / SO2 ratio instrument 491 is arranged on the connecting pipeline between the Claus reaction unit 4 and the SO2 catalytic oxidation reactor.

[0047] Specifically, the Claus reaction unit 4 comprises a first-stage sulfur condenser 40, a first-stage reheater 41, a first-stage catalytic reactor 42, a second-stage sulfur condenser 43, a second-stage reheater 44, a second-stage catalytic reactor 45, a third-stage sulfur condenser 46, a third-stage reheater 47, a third-stage catalytic reactor 48, and a fourth-stage sulfur condenser 49, which are sequentially connected, the first-stage sulfur condenser 40 is connected with the combustion unit 3, and the gas outlet of the fourth-stage sulfur condenser 49 is connected with the first gas inlet of the SO2 catalytic oxidation reactor 6.

[0048] Preferably, the first-stage sulfur condenser is connected with the first steam generator.

[0049] Preferably, the H2S / SO2 ratio instrument is arranged on the connecting pipeline between the fourth-stage sulfur condenser 49 and the SO2 catalytic oxidation reactor.

[0050] The H2S / SO2 ratio instrument is arranged for detecting the H2S / SO2 content of the process gas, so as to control the fine air amount entering the acid gas combustion furnace and ensure the sulfur recovery rate of the Claus reaction unit.

[0051] The sulfur recovery operation of the utility model is that the acid gas and the air from the combustion furnace fan enter the acid gas combustion furnace, the air is divided into main regulation air and fine regulation air, the main regulation air is controlled in proportion to the acid gas flow, the proportion is between 2-2.2, and the fine regulation air is adjusted according to the H2S / SO2 concentration displayed by the ratio instrument at the outlet of the fourth-stage condenser. The process gas from the combustion furnace enters the combustion furnace steam generator for temperature reduction and by-product steam production, the process gas at the outlet of the steam generator enters the first-stage sulfur condenser for condensation and sulfur recovery, the process gas is preheated by the medium-pressure steam in the first-stage reheater and then enters the first-stage catalytic reactor, the process gas from the first-stage catalytic reactor enters the second-stage sulfur condenser for condensation and sulfur recovery, the process gas is preheated by the medium-pressure steam in the second-stage reheater and then enters the second-stage catalytic reactor, the process gas from the second-stage catalytic reactor enters the third-stage sulfur condenser for condensation and sulfur recovery, the process gas is preheated by the medium-pressure steam in the third-stage reheater and then enters the third-stage catalytic reactor, the process gas from the third-stage catalytic reactor enters the fourth-stage sulfur condenser for condensation and sulfur recovery, and the Claus tail gas is used for sulfuric acid production.

[0052] The utility model discloses sulfuric acid is made as, the process gas of claus reaction unit comes, acid gas enters combustion air into combustion furnace, and the process gas after combustion enters second steam generator, and the process gas pipeline of out second steam generator is provided with O2 content analyzer, according to oxygen content signal, adjusts the air amount of supplement or shunt acid gas to the combustion furnace, and the process gas of adjusting good oxygen sulfur ratio enters SCR denitration reactor, and the denitration agent adopts ammonia water or ammonia gas, and the process gas after denitration enters SO2 catalytic oxidation reactor, and catalytic oxidation reactor sets up 2 layer catalyst bed, 2 layer heat exchange section, and the process gas after out first catalyst bed enters process gas - claus tail gas heat exchanger, and preheats claus tail gas, and the process gas after cooling enters second catalyst bed, and the process gas that comes out enters second heat exchanger, and the boiler water after heating of second steam generator returns steam drum by - product steam, and the process gas after cooling enters sulfuric acid condenser, and the air of fan comes in is used in this sulfuric acid condenser cooling, and sulfuric acid condenses after in sulfuric acid condenser and flows out from condenser bottom, and the process gas is discharged from top and is sent to subsequent desulfurization device. The hot air of out sulfuric acid condenser a part of wind is sent to combustion furnace as combustion air after fan pressurization, and the remaining air then mixes with the process gas of out sulfuric acid condenser and enters desulfurization device.

[0053] Although the utility model discloses as above, the utility model is not limited to this. Any person skilled in the art, without departing from the spirit and scope of the utility model, can make various changes and modifications, therefore the protection scope of the utility model should be the range limited by the claims.

Claims

1. An acid making system capable of co-producing sulphur and capable of treating a Claus sulphur off-gas, characterized in that, The first acid gas pipeline (1), the second acid gas pipeline (2), the combustion unit (3), the Claus reaction unit (4), the incineration unit (5), the SO2 catalytic oxidation reactor (6), the SCR denitration reactor (7), the sulfuric acid condenser (8), the first acid gas pipeline (1) is connected with the combustion unit (3), the combustion unit (3) is connected with the Claus reaction unit (4), the Claus reaction unit (4) is connected with the SO2 catalytic oxidation reactor (6), the SO2 catalytic oxidation reactor (6), the second acid gas pipeline (2) is connected with the incineration unit (5), the incineration unit (5) is connected with the SCR denitration reactor (7), the SCR denitration reactor (7) is connected with the SO2 catalytic oxidation reactor (6), and the SO2 catalytic oxidation reactor (6) is connected with the sulfuric acid condenser (8).

2. The acid generating system of claim 1, wherein The gas inlet of the first acid gas pipeline (1) is connected with the gas inlet of the combustion unit (3), the gas outlet of the combustion unit (3) is connected with the gas inlet of the Claus reaction unit (4), the gas outlet of the Claus reaction unit (4) is connected with the first gas inlet of the SO2 catalytic oxidation reactor (6), the first gas outlet of the SO2 catalytic oxidation reactor (6) and the gas inlet of the second acid gas pipeline (2) are connected with the gas inlet of the incineration unit (5), the gas outlet of the incineration unit (5) is connected with the gas inlet of the SCR denitration reactor (7), the gas outlet of the SCR denitration reactor (7) is connected with the second gas inlet of the SO2 catalytic oxidation reactor (6), and the second gas outlet of the SO2 catalytic oxidation reactor (6) is connected with the sulfuric acid condenser (8).

3. The acid generating system of claim 2, wherein The first gas outlet and the second gas outlet are located at the side end of the SO2 catalytic oxidation reactor, the second gas inlet is located at the upper end of the SO2 catalytic oxidation reactor, and the second gas outlet is located at the lower end of the SO2 catalytic oxidation reactor.

4. The acid generating system of claim 3, wherein The combustion unit (3) comprises a combustion furnace burner (31), a combustion furnace (32) and a first steam generator (33) connected in sequence, the first acid gas pipeline (1) is connected with the combustion furnace burner (31), and the first steam generator (33) is connected with the Claus reaction unit (4).

5. The acid generating system of claim 4, wherein, The incineration unit (5) comprises an incineration furnace burner (51), an incineration furnace (52) and a second steam generator (53) connected in sequence, the first gas outlet of the SO2 catalytic oxidation reactor (6) is connected with the gas inlet of the incineration furnace (52), and the gas inlet of the second acid gas pipeline (2) is connected with the gas inlet of the incineration furnace burner (51).

6. The acid generating system of claim 1, wherein The Claus reaction unit (4) comprises a first-stage sulfur condenser (40), a first-stage reheater (41), a first-stage catalytic reactor (42), a second-stage sulfur condenser (43), a second-stage reheater (44), a second-stage catalytic reactor (45), a third-stage sulfur condenser (46), a third-stage reheater (47), a third-stage catalytic reactor (48), and a fourth-stage sulfur condenser (49) connected in sequence, the first-stage sulfur condenser (40) is connected with the combustion unit (3), and the gas outlet of the fourth-stage sulfur condenser (49) is connected with the first gas inlet of the SO2 catalytic oxidation reactor (6).

7. The acid generating system of claim 1, wherein The H2S / SO2 ratio instrument (491) is arranged on the connecting channel of the Claus reaction unit (4) and the SO2 catalytic oxidation reactor (6).

8. The acid generating system of claim 1, wherein The O2 content analyzer (531) is arranged on the connecting pipeline of the incineration unit (5) and the SCR denitration reactor (7).

9. The acid generating system of claim 5, wherein, The burner of the incineration furnace (52) comprises a gas gun (521), an acid gas pipe (522), an air cavity (523), a furnace cavity (524), a hearth brick (525), and a shell (526), the air swirl device (527) is arranged on the end of the acid gas pipe (522) close to the furnace cavity (524), the air cavity (523) is located between the shell (526), the acid gas pipe (522), and the hearth brick (525), the hearth brick (525) surrounds the outside of the air swirl device (527), the air distribution ring pipe (5251) is arranged on the hearth brick (525), and the air distribution ring pipe (5251) is in communication with the furnace cavity (524).

10. The acid generating system of claim 9, wherein, The gas gun (521) is provided with a first fuel gas inlet (5211) and a second fuel gas inlet (5212), the acid gas pipe (522) is provided with an acid gas inlet (5221), and the shell (526) is provided with a combustion air inlet (5231).

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