High-temperature flue gas waste heat hot water boiler system for preparing SO2 through sulfur combustion furnace

Abstract

The utility model discloses a high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace, and belongs to the technical field of salt chemical industry and waste heat recovery. In order to solve the problem that high-grade waste heat is wasted due to the fact that high-temperature SO2 flue gas in the process of preparing SO2 through a sulfur combustion furnace is usually cooled through spraying of a water washing tower, the high-temperature SO2 flue gas is fed into an anti-corrosion miniature high-temperature flue gas waste heat hot water boiler and exchanges heat with high-temperature waste heat water supply through a heat exchanger, and the heated high-temperature waste heat water supply is fed to downstream heat users; and the medium-temperature SO2 flue gas at the outlet of the waste heat hot water boiler is returned to the water washing tower and is washed and cooled by spraying water, and the purified SO2 flue gas is sent to the downstream absorption tower to realize the absorption process of the mixed gas of bromine and air. The low-limit value of the temperature of flue gas at the outlet of the waste heat hot water boiler is controlled by an electric control valve at the outlet of a water feeding pump, and the low-limit value of the temperature of high-temperature waste heat feed water at the inlet of the waste heat hot water boiler is controlled by a water mixing control valve group to ensure that the temperature of the heat exchanger wall contacted with flue gas is always higher than the flue gas acid dew point.

Description

Technical Field

[0001] The utility model relates to a high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace, belonging to the technical fields of salt chemical industry and waste heat recovery. Background Art

[0002] A salt chemical plant based on seawater salt production can extract substances such as bromine and lithium from seawater or concentrated bitter brine after salt production. The basic principle of the commonly used "air blowing method for bromine production by chlorine oxidation" is as follows.

[0003] Under acidic conditions, using chlorine as an oxidant, bromide ions (Br-) are oxidized to bromine molecules (Br2), and the ionic reaction formula is as follows.

[0004] 2Br-+Cl2 = Br2+2Cl-.

[0005] The free bromine is blown out by air, so it is called the air blowing method.

[0006] Acidic bromine production uses sulfur dioxide as an absorbent, and fresh water spray is used to assist in absorbing the mixed gas of air and bromine. The absorption completion liquid is called primary acid, and the chemical reaction formula is as follows.

[0007] Br2+SO2+2H2O = 2HBr+H2SO4.

[0008] The primary acid is introduced into chlorine for oxidation to re-free bromine and generate hydrochloric acid. The chemical reaction formula is as follows.

[0009] 2HBr+Cl2 = 2HCl+Br2.

[0010] Finally, bromine is distilled out with steam, and after condensation and separation, the finished bromine is obtained.

[0011] The process flow is described as follows.

[0012] Seawater (brine) is pumped to the blowing tower. Dilute acid and chlorine are added to the outlet pipeline of the pump. The mixed acidified and chlorinated brine sprays down from the upper part of the blowing tower. The blower blows air into the bottom of the tower. When the brine contacts the air, the free bromine in the brine is desorbed and blown out. The blown waste liquid is discharged from the bottom of the blowing tower and enters the salt field for salt drying. The mixed gas discharged from the top of the blowing tower is sent to the absorption tower and is mixed and absorbed by sulfur dioxide and water mist. The formed completion liquid is called primary acid, which is collected in the acid storage tank. The air purified by the demister is agitated by the blower and enters the bottom of the blowing tower for recycling in the system. The primary acid is added from the top of the distillation tower, and steam and chlorine are introduced from the bottom of the tower. When the primary acid flows down along the packing from top to bottom, it contacts the chlorine and steam flowing from bottom to top, and is continuously oxidized and distilled. The mixed gas of bromine vapor and water vapor is discharged from the top of the tower, and after condensation and separation, liquid bromine is obtained, and the crude bromine water returns to the absorption tower for continuous circulation.

[0013] Among them, chlorine gas is usually obtained by vaporizing liquid chlorine through a water bath tank. The process method is as follows: Feed the liquid chlorine into the water bath bottle, and its upper nozzle is tightly connected to the chlorine gas clamp. Fill the chlorine gas water bath tank with water and use steam to heat the water in the tank. Control the temperature at 75°C - 83°C through the solenoid valve. This temperature range can achieve the vaporization of liquid chlorine and avoid the generation of nitrogen trichloride explosives. The vaporized chlorine gas is supplied out.

[0014] The preparation process of SO2 gas is as follows: Sulfur enters the sulfur combustion furnace through the distributor and burns with the oxygen in the blown air at high temperature to generate sulfur dioxide gas. After air cooling and cooling by circulating water washing, the temperature is controlled below 70°C, and then it enters the blow - suction tower for reduction absorption to produce the completed liquid for bromine production.

[0015] The bromine extraction distillation process is as follows: The completed liquid is pre - heated by the recycled liquid and then enters the distillation tower where it is oxidized by chlorine gas. At the same time, steam distillation is carried out, and bromine is distilled out. The temperature at the top of the tower is controlled at 80 - 90°C. After condensation, crude bromine is obtained. The bromine - distilled recycled liquid is cooled by heat exchange with brine and then enters the collection pool, and then is used for brine acidification.

[0016] There are obvious energy wastes in the above - mentioned traditional seawater bromine extraction process. For example: The high - temperature flue gas (up to 600 - 700°C level) during the preparation of SO2 gas in the sulfur combustion furnace is not usually recovered because of its strong corrosiveness and small flue gas volume, but directly enters the water washing tower for spraying and cooling to 50 - 60°C level; The discharged waste sulfuric acid liquid (SH) is not usually recovered because of its extremely strong corrosiveness, small flow rate and low temperature grade, and finally is wasted in vain; Although the bromine - distilled recycled liquid discharged from the bromine extraction distillation tower is usually equipped with a special heat exchanger to recover part of the waste heat, due to the very poor heat transfer performance and high cost of the original special heat exchanger, the amount of waste heat recovered is relatively small, so that the discharge temperature of the bromine - distilled recycled liquid is usually still as high as above 50 - 60°C, and the waste heat in its low - temperature section is still wasted in vain. At the same time, it leads to relatively more steam added, higher energy consumption and operating costs. In short, due to the strong corrosiveness and small flow rate of the relevant flue gas and the discharged process water, a large proportion of various waste heat resources are wasted in vain, and it is necessary to recover and utilize them to achieve energy conservation and consumption reduction. Utility Model Content

[0017] The purpose and task of the present utility model are, aiming at the inherent technical limitations existing in the above - mentioned seawater bromine extraction process, adopting anti - corrosion measures to recover the waste heat of high - temperature SO2 flue gas and using it for process production and heating domestic hot water.

[0018] The specific description of the present utility model is: A high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace, which is composed of an original combustion furnace and an SO2 flue gas water washing tower subsystem, a high-temperature SO2 flue gas waste heat hot water boiler subsystem, and their connecting pipelines and components. Among them, the original combustion furnace and the SO2 flue gas water washing tower subsystem include a sulfur combustion furnace 1, an ash sedimentation tank 2, a high-temperature SO2 flue 3, a water washing tower 4, a clean SO2 flue gas pipe 5, a Roots blower 6, a water washing pump 7, and their connecting pipelines and components. It is characterized in that the high-temperature SO2 flue gas waste heat hot water boiler subsystem includes a corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10, a feed water pump 16, a bypass air valve group 18, an original path air valve 19, and their connecting pipelines and components. Among them, the original path air valve 19 is arranged on the high-temperature flue 3 of the high-temperature SO2 flue gas S1. The inlet of the original path air valve 19 is connected to the outlet of the ash sedimentation tank 2 and the upstream air valve inlet of the bypass air valve group 18. The outlet of the original path air valve 19 is connected to the flue gas inlet of the water washing tower 4 and the downstream air valve outlet of the bypass air valve group 18. The inlet of the ash sedimentation tank 2 is connected to the flue gas outlet of the sulfur combustion furnace 1. The air inlet of the sulfur combustion furnace 1 is connected to the air outlet of the Roots blower 6. The sulfur combustion furnace 1 is also provided with a feed port for sulfur S. The air inlet of the Roots blower 6 communicates with the ambient air A. The flue gas outlet of the water washing tower 4 is the SO2 outlet pipe 5 of the clean SO2 flue gas S2. The bottom acid liquid outlet of the water washing tower 4 is connected to the inlet of the water washing pump 7. The outlet of the water washing pump 7 is connected to the inlet of the spraying device of the water washing tower 4 and is communicated with the discharge pipe of the waste sulfuric acid liquid SH and the water supply pipe of the makeup water B. The upstream air valve outlet of the bypass air valve group 18 is connected to the inlet of the inlet rectifying section 11 of the corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10. The corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10 also includes a shell 12, an ultra-large temperature difference heat exchanger 13, and an outlet converging section. The medium-temperature flue gas outlet of the outlet converging section is connected to the inlet of the downstream air valve of the bypass air valve group 18. Among them, the water inlet of the ultra-large temperature difference heat exchanger 13 is connected to the outlet of the feed water pump 16. The water outlet of the ultra-large temperature difference heat exchanger 13 is connected to the inlet of the water supply regulating valve 25 and the inlet of the bypass regulating valve 24. The outlet of the water supply regulating valve 25 is connected to the water supply pipe of the high-temperature water supply G. The outlet of the bypass regulating valve 24 is connected to the inlet of the feed water pump 16 and the water supply pipe of the high-temperature return water H.

[0019] A feed water temperature sensor 15 is arranged on the water inlet pipe section of the ultra-large temperature difference heat exchanger 13. A safety valve group 14 is arranged on the water outlet pipe section of the ultra-large temperature difference heat exchanger 13. A medium-temperature flue gas sensor 17 is arranged on the medium-temperature flue gas pipe section at the outlet of the corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10.

[0020] The low limit temperature of the feed water temperature sensor 15 is controlled by the opening degrees of the water supply regulating valve 25 and the bypass regulating valve 24. The low limit temperature of the medium-temperature flue gas sensor 17 is controlled by the opening degree of the electric regulating valve at the outlet of the feed water pump 16.

[0021] The ultra-large temperature difference heat exchanger 13 adopts a serpentine coil structure, a longitudinal tube bundle structure, a plate structure or a tube-sheet structure.

[0022] The ultra-large temperature difference heat exchanger 13 adopts a smooth tube or finned tube structure.

[0023] The material of the ultra-large temperature difference heat exchanger 13 is carbon steel, ND steel, stainless steel 304 or stainless steel 316L.

[0024] The material of the feed water pump 16 is a high-temperature cast iron pump or a stainless steel water pump.

[0025] The beneficial effects of the present utility model are as follows.

[0026] (1) Aiming at the strong corrosiveness problem of high-temperature SO2 flue gas, based on the acid dew point control method, this patent ensures that the temperature of the heat exchange tube wall in contact with the flue gas is always maintained above the acid dew point, thus ensuring that acid dew point corrosion will not occur. Therefore, common boiler steels such as carbon steel, ND steel, stainless steel 304 or 316L can be used as the heat exchange tube materials, which greatly reduces the processing difficulty and cost of the heat exchanger and the entire waste heat boiler, and solves the problem of waste heat recovery from the flue gas of the sulfur combustion furnace.

[0027] (2) This waste heat boiler can produce high-parameter surplus hot water, which is more convenient for reuse in process production.

[0028] (3) By accurately controlling the most critical boiler feed water temperature and flue gas temperature for exhaust, serious corrosiveness problems are avoided, ensuring the safe, stable and reliable operation of the equipment, increasing the service life, and significantly reducing the full-cycle operation cost. Description of the Drawings

[0029] Figure 1 is a schematic system diagram of the conventional production process for preparing SO2 gas in seawater bromine extraction, Figure 2 is a schematic system diagram of the present utility model.

[0030] Figure 1 、 2 The numbers and names of the components in

[0031] Sulfur combustion furnace 1, soot settling tank 2, high-temperature SO2 flue 3, water scrubber 4, clean SO2 gas pipe 5, Roots blower 6, water wash pump 7, original heat exchanger 8, absorption tower 9, anti-corrosion micro high-temperature flue gas waste heat hot water boiler 10, inlet rectifying section 11, outer shell 12, ultra-large temperature difference heat exchanger 13, safety valve group 14, feed water temperature sensor 15, feed water pump 16, medium-temperature flue gas sensor 17, bypass air damper group 18, original path damper 19, bypass regulating valve 24, water supply regulating valve 25, ambient air A, make-up water B, bromine and air mixture BrA, finished liquid BrH, high-temperature water supply G, high-temperature return water H, spray water R, sulfur S, high-temperature SO2 flue gas S1, clean SO2 flue gas S2, waste sulfuric acid liquid SH. Detailed implementation mode

[0032] Figure 1 It is a system schematic diagram and an embodiment of the conventional production process for preparing SO2 gas in bromine extraction from seawater. Figure 2 It is a system schematic diagram and an embodiment of the present utility model.

[0033] The embodiments of the conventional production process for preparing SO2 gas in bromine extraction from seawater are as follows. Refer to Figure 1 as shown. The conventional system consists of a sulfur combustion furnace 1, a soot settling tank 2, a high-temperature SO2 flue 3, a water scrubber 4, a clean SO2 gas pipe 5, a Roots blower 6, a water wash pump 7, an original heat exchanger 8, an absorption tower 9 and their connecting pipelines and components. Among them, the air inlet of the sulfur combustion furnace 1 is connected to the air outlet of the Roots blower 6. The sulfur combustion furnace 1 is also provided with a feed port for sulfur S. The air inlet of the Roots blower 6 communicates with the ambient air A. The flue gas outlet of the sulfur combustion furnace 1 is connected to the inlet of the soot settling tank 2. The outlet of the soot settling tank 2 is connected to the flue gas inlet of the water scrubber 4 through the high-temperature flue 3 of the high-temperature SO2 flue gas S1. The flue gas outlet of the water scrubber 4 is the SO2 outlet pipe 5 of the clean SO2 flue gas S2, and its downstream is connected to the flue gas inlet of the absorption tower 9. The bottom acid liquid outlet of the water scrubber 4 is connected to the inlet of the water wash pump 7. The outlet of the water wash pump 7 is connected to the high-temperature side inlet of the original heat exchanger 8. The high-temperature side outlet of the original heat exchanger 8 is connected to the inlet of the spray device of the water scrubber 4 and communicates with the discharge pipe of the waste sulfuric acid liquid SH and the water supply pipe of the make-up water B. The low-temperature side inlet and outlet of the original heat exchanger 8 are respectively connected to the incoming water and the return water pipeline of the water to be heated. The absorption tower 9 is also provided with an inlet for the spray water R, an inlet for the bromine and air mixture BrA and an outlet for the finished liquid BrH.

[0034] The specific embodiment 2 of the present utility model is as follows. Refer to Figure 2As shown in the figure. A high-temperature flue gas waste heat hot water boiler system for preparing SO2 in a sulfur combustion furnace is composed of an original combustion furnace and an SO2 flue gas water washing tower subsystem, a high-temperature SO2 flue gas waste heat hot water boiler subsystem, and their connecting pipelines and components. Among them, the original combustion furnace and the SO2 flue gas water washing tower subsystem include a sulfur combustion furnace 1, an ash sedimentation tank 2, a high-temperature SO2 flue 3, a water washing tower 4, a clean SO2 flue gas pipe 5, a Roots blower 6, a water washing pump 7, and their connecting pipelines and components. It is characterized in that the high-temperature SO2 flue gas waste heat hot water boiler subsystem includes a corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10, a feed water pump 16, a bypass air valve group 18, an original path air valve 19, and their connecting pipelines and components. Among them, the original path air valve 19 is arranged on the high-temperature flue 3 of the high-temperature SO2 flue gas S1. The inlet of the original path air valve 19 is connected to the outlet of the ash sedimentation tank 2 and the upstream air valve inlet of the bypass air valve group 18. The outlet of the original path air valve 19 is connected to the flue gas inlet of the water washing tower 4 and the downstream air valve outlet of the bypass air valve group 18. The inlet of the ash sedimentation tank 2 is connected to the flue gas outlet of the sulfur combustion furnace 1. The air inlet of the sulfur combustion furnace 1 is connected to the air outlet of the Roots blower 6. The sulfur combustion furnace 1 is also provided with a feed port for sulfur S. The air inlet of the Roots blower 6 communicates with the ambient air A. The flue gas outlet of the water washing tower 4 is the SO2 flue gas pipe 5 of the clean SO2 flue gas S2. The bottom acid liquid outlet of the water washing tower 4 is connected to the inlet of the water washing pump 7. The outlet of the water washing pump 7 is connected to the inlet of the spraying device of the water washing tower 4 and is communicated with the discharge pipe of the waste sulfuric acid liquid SH and the water supply pipe of the makeup water B. The upstream air valve outlet of the bypass air valve group 18 is connected to the inlet of the inlet rectifying section 11 of the corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10. The corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10 also includes a housing 12, an ultra-large temperature difference heat exchanger 13, and an outlet converging section. The medium-temperature flue gas outlet of the outlet converging section is connected to the inlet of the downstream air valve of the bypass air valve group 18. Among them, the water inlet of the ultra-large temperature difference heat exchanger 13 is connected to the outlet of the feed water pump 16. The water outlet of the ultra-large temperature difference heat exchanger 13 is connected to the inlet of the water supply regulating valve 25 and the inlet of the bypass regulating valve 24. The outlet of the water supply regulating valve 25 is connected to the water supply pipe of the high-temperature water supply G. The outlet of the bypass regulating valve 24 is connected to the inlet of the feed water pump 16 and the water supply pipe of the high-temperature return water H.

[0035] A feed water temperature sensor 15 is arranged on the water inlet pipe section of the ultra-large temperature difference heat exchanger 13. A safety valve group 14 is arranged on the water outlet pipe section of the ultra-large temperature difference heat exchanger 13. A medium-temperature flue gas sensor 17 is arranged on the medium-temperature flue gas pipe section at the outlet of the corrosion-resistant micro high-temperature flue gas waste heat hot water boiler 10.

[0036] The low limit temperature of the feed water temperature sensor 15 is controlled by the opening degrees of the water supply regulating valve 25 and the bypass regulating valve 24. The low limit temperature of the medium-temperature flue gas sensor 17 is controlled by the opening degree of the electric regulating valve at the outlet of the feed water pump 16.

[0037] The ultra-large temperature difference heat exchanger 13 adopts a serpentine coil structure, a longitudinal tube bundle structure, a plate structure or a tube-and-plate structure.

[0038] The ultra-large temperature difference heat exchanger 13 adopts a smooth tube or finned tube structure.

[0039] The material of the ultra-large temperature difference heat exchanger 13 is carbon steel, ND steel, stainless steel 304 or stainless steel 316L.

[0040] The material of the feed water pump 16 is a high-temperature cast iron pump or a stainless steel water pump.

[0041] The original heat exchanger 8, which is expensive and of extremely low practical value, is no longer provided in this system.

[0042] It should be noted that based on the key technologies of controlling the acid dew point to realize the waste heat recovery of high-temperature SO2 flue gas and the like, the present utility model proposes a complete set of brand-new equipment and systems for high-temperature SO2 flue gas. According to this solution, there can be different specific implementation measures and specific implementation devices with different structures. The above specific implementation manner is only one of the implementation forms. Any other similar simple deformed implementation manners, such as simple increase or decrease, deformation, change of relative position of internal components and interfaces, simple combination and adjustment of external pipelines and components, etc., all fall within the protection scope of the present utility model.

Claims

1. A high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace is composed of an original combustion furnace and an SO2 flue gas water washing tower subsystem, a high-temperature SO2 flue gas waste heat hot water boiler subsystem, and their connecting pipelines and components. The original combustion furnace and the SO2 flue gas water washing tower subsystem include a sulfur combustion furnace (1), an ash sedimentation tank (2), a high-temperature SO2 flue (3), a water washing tower (4), a clean SO2 flue gas pipe (5), a Roots blower (6), a water washing pump (7), and their connecting pipelines and components. It is characterized in that, The described high-temperature SO2 flue gas waste heat hot water boiler subsystem includes an anti-corrosion micro high-temperature flue gas waste heat hot water boiler (10), a feed water pump (16), a bypass air valve group (18), a return path air valve (19) and their connecting pipelines and components. Among them, the return path air valve (19) is arranged on the high-temperature SO2 flue (3) of the high-temperature SO2 flue gas (S1). The inlet of the return path air valve (19) is connected to the outlet of the soot sedimentation tank (2) and the inlet of the upstream air valve of the bypass air valve group (18). The outlet of the return path air valve (19) is connected to the flue gas inlet of the water scrubber (4) and the outlet of the downstream air valve of the bypass air valve group (18). The inlet of the soot sedimentation tank (2) is connected to the flue gas outlet of the sulfur combustion furnace (1). The air inlet of the sulfur combustion furnace (1) is connected to the air outlet of the Roots blower (6). The sulfur combustion furnace (1) is also provided with a feed port for sulfur (S). The air inlet of the Roots blower (6) communicates with the ambient air (A). The flue gas outlet of the water scrubber (4) is the net SO2 flue (5) of the net SO2 flue gas (S2); the bottom acid liquid outlet of the water scrubber (4) is connected to the inlet of the water scrubbing pump (7). The outlet of the water scrubbing pump (7) is connected to the inlet of the spraying device of the water scrubber (4) and communicates with the discharge pipe of the waste sulfuric acid liquid (SH) and the water supply pipe of the makeup water (B); the outlet of the upstream air valve of the bypass air valve group (18) is connected to the inlet of the inlet rectifying section (11) of the anti-corrosion micro high-temperature flue gas waste heat hot water boiler (10). The anti-corrosion micro high-temperature flue gas waste heat hot water boiler (10) also includes a casing (12), an ultra-large temperature difference heat exchanger (13) and an outlet converging section. The medium-temperature flue gas outlet of the outlet converging section is connected to the inlet of the downstream air valve of the bypass air valve group (18); among them, the water inlet of the ultra-large temperature difference heat exchanger (13) is connected to the outlet of the feed water pump (16). The water outlet of the ultra-large temperature difference heat exchanger (13) is connected to the inlet of the water supply regulating valve (25) and the inlet of the bypass regulating valve (24). The outlet of the water supply regulating valve (25) is connected to the water supply pipe of the high-temperature water supply (G). The outlet of the bypass regulating valve (24) is connected to the inlet of the feed water pump (16) and the water supply pipe of the high-temperature return water (H).

2. The high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace according to claim 1, characterized in that A feed water temperature sensor (15) is arranged on the water inlet pipe section of the described ultra-large temperature difference heat exchanger (13). A safety valve group (14) is arranged on the water outlet pipe section of the ultra-large temperature difference heat exchanger (13). A medium-temperature flue gas sensor (17) is arranged on the medium-temperature flue gas pipe section at the outlet of the anti-corrosion micro high-temperature flue gas waste heat hot water boiler (10).

3. A high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace according to claim 2, characterized in that The low limit temperature of the described feed water temperature sensor (15) is controlled by the opening degrees of the water supply regulating valve (25) and the bypass regulating valve (24); the low limit temperature of the medium-temperature flue gas sensor (17) is controlled by the opening degree of the electric regulating valve at the outlet of the feed water pump (16).

4. A high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace according to claim 1, characterized in that The described ultra-large temperature difference heat exchanger (13) adopts a serpentine coil structure, a longitudinal tube bundle structure, a plate structure or a tube-and-plate structure.

5. A high-temperature flue gas waste heat hot water boiler system for preparing SO2 in a sulfur combustion furnace according to claim 1, characterized in that The described ultra-large temperature difference heat exchanger (13) adopts a smooth tube or finned tube structure.

6. The high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace according to claim 1, characterized in that The material of the described ultra-large temperature difference heat exchanger (13) adopts carbon steel, ND steel, stainless steel 304 or stainless steel 316L.

7. The high-temperature flue gas waste heat hot water boiler system for preparing SO2 by a sulfur combustion furnace according to claim 1, characterized in that The material of the feed water pump (16) is a high-temperature cast iron pump or a stainless steel water pump.

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