High-temperature sulfur dioxide flue gas waste heat utilization system

Abstract

The utility model discloses a high-temperature sulfur dioxide flue gas waste heat utilization system which comprises a control device, a combustion chamber, a high-temperature flue gas channel and a waste heat steam boiler, the combustion chamber is connected with the high-temperature flue gas channel, and the waste heat steam boiler is arranged above the high-temperature flue gas channel and connected with the high-temperature flue gas channel through a plurality of heat exchange pieces; one end of the waste heat steam boiler is provided with a water inlet connected with a water inlet pipe, and the other end of the waste heat steam boiler is provided with a first drain outlet; the first sewage draining exit is connected with a first sewage draining pipeline, and a first sewage draining valve is arranged on the first sewage draining pipeline; a water inlet valve is arranged on the water inlet pipe; a plurality of steam outlet valves, a plurality of safety valves and a pressure gauge are arranged on the waste heat steam boiler; a water level measuring device is arranged on the waste heat steam boiler; the water level measuring device is connected with the salt content optical measuring device through a pipeline, and a stop valve is arranged on the pipeline. The high-temperature sulfur dioxide flue gas waste heat utilization system has the advantages of being efficient in waste heat utilization and safe to use.

Description

Technical Field

[0001] The present invention relates to the technical field of the chemical industry, and particularly to a high-temperature sulfur dioxide flue gas waste heat utilization system. Background Art

[0002] A large amount of heat energy is contained in high-temperature flue gas and can be utilized. For example, in the process of producing ammonium sulfite salts, sulfur-containing substances are often burned in a sulfur-burning furnace to generate high-temperature sulfur dioxide flue gas, and the temperature of the sulfur dioxide flue gas is as high as over 800 °C. The neutralization of sulfur dioxide with ammonia water to produce ammonium sulfite salts is an exothermic reaction. Therefore, it is necessary to reduce the temperature of the sulfur dioxide flue gas. In the prior art, the high-temperature sulfur dioxide flue gas waste heat utilization system has low efficiency and there is a safety risk of easy explosion. Summary of the Invention

[0003] The purpose of the present utility model is to provide a high-temperature sulfur dioxide flue gas waste heat utilization system in view of the deficiencies of the prior art, which has the characteristics of high efficiency in waste heat utilization and safe use.

[0004] The technical solution adopted by the present utility model is as follows.

[0005] A high-temperature sulfur dioxide flue gas waste heat utilization system, which is characterized in that it includes a control device, a combustion chamber, a high-temperature flue gas passage, and a waste heat steam boiler. The combustion chamber is connected to the high-temperature flue gas passage, and the waste heat steam boiler is arranged above the high-temperature flue gas passage and is connected to the waste heat steam boiler through a plurality of heat exchange fins; one end of the waste heat steam boiler is provided with a water inlet, the water inlet is connected to a water inlet pipe, and the other end is provided with a first blowdown port; the first blowdown port is connected to a first blowdown pipeline, and a first blowdown valve is arranged on the first blowdown pipeline; a water inlet valve is arranged on the water inlet pipe; a plurality of steam outlet valves, a plurality of safety valves, and a pressure gauge are arranged on the waste heat steam boiler;

[0006] A water level measuring device is arranged on the waste heat steam boiler; the water level measuring device is connected to a salt content optical measuring device through a pipeline, and a stop valve is arranged on the pipeline;

[0007] The water level measuring device, the safety valve, the water inlet valve, the first blowdown valve, the steam outlet valve, the salt content optical measuring device, and the stop valve are all connected to the control device.

[0008] The beneficial effects of the present utility model are as follows: A water level measuring device is provided on the waste heat steam boiler, and the water level measuring device is connected to the optical salt content measuring device; the water level measuring device, the optical salt content measuring device, the pressure measuring device, the safety valve, the water inlet valve, the first blowdown valve, the safety valve, the steam outlet valve, and the first blowdown valve are all connected to the control device. When the waste heat steam boiler generates steam, when the optical salt content measuring device measures that the salt content of the water in the waste heat steam boiler exceeds the standard, the first blowdown valve opens; when the water level measuring device measures that the water level in the waste heat steam boiler is lower than the set value, the water inlet valve opens; when the pressure measuring device measures that the pressure in the waste heat steam boiler exceeds the set value, each safety valve opens, ensuring the safe use of the waste heat steam boiler.

[0009] As a preferred technical solution, a second blowdown port is provided at the bottom end of the waste heat steam boiler, and the second blowdown port is connected to the second blowdown pipeline; a second blowdown valve is provided on the second blowdown pipeline, and the second blowdown valve is connected to the control device. There is a certain amount of moisture in the high-temperature sulfur dioxide flue gas, and the heat of the high-temperature sulfur dioxide flue gas can be utilized. During the waste heat utilization process, the sulfur dioxide gas rapidly cools down, and sulfur dioxide reacts with water to form sulfurous acid solution, which can be discharged through the second blowdown valve to improve the purity of the sulfur dioxide gas.

[0010] As a preferred technical solution, the water level measuring device includes an electrode water level gauge, and the electrode water level gauge is connected to the waste heat steam boiler through a pipeline.

[0011] As a preferred technical solution, the water level measuring device includes a two-color water level gauge, and the two-color water level gauge is connected to the waste heat steam boiler through a pipeline.

[0012] As a preferred technical solution, the water level measuring device includes a flat water level gauge, and the flat water level gauge is connected to the waste heat steam boiler through a pipeline.

[0013] As a preferred technical solution, the optical salt content measuring device includes a salinity prism refractometer, and the flat water level gauge is connected to the salinity prism refractometer through a pipeline, and a stop valve is provided on the pipeline.

[0014] As a preferred technical solution, the longitudinal section of the warm flue gas channel is circular, and the central axis of the warm flue gas channel is horizontally arranged.

[0015] As a preferred technical solution, the longitudinal section of the waste heat steam boiler is circular, and the central axis of the waste heat steam boiler is horizontally arranged. Description of the Drawings

[0016] Figure 1 is the front view of the high-temperature sulfur dioxide flue gas waste heat utilization system of the present utility model.

[0017] Figure 2 is the top view of the high-temperature sulfur dioxide flue gas waste heat utilization system of the present utility model.

[0018] Figure 3 It is the right view of the high-temperature sulfur dioxide flue gas waste heat utilization system of the present utility model.

[0019] Wherein: combustion chamber - 1; high-temperature flue gas passage - 2; waste heat steam boiler - 3; heat exchange fins - 4; water inlet pipe - 5; water inlet - 6; first blowdown port - 7; first blowdown pipe - 8; first blowdown valve - 9; water inlet valve - 10; steam outlet valve - 11; safety valve - 12; pressure gauge - 13; second blowdown port - 14; second blowdown pipe - 15; second blowdown valve - 16; electrode water level gauge - 17; two-color water level gauge - 18; flat water level gauge - 19; salinity prism refractometer - 20; globe valve - 21. Specific embodiments

[0020] Next, the present utility model will be further described in conjunction with the drawings and embodiments.

[0021] A high-temperature sulfur dioxide flue gas waste heat utilization system, characterized in that: it includes a control device, a combustion chamber 1, a high-temperature flue gas passage 2, and a waste heat steam boiler 3. The combustion chamber 1 is connected to the high-temperature flue gas passage 2. The waste heat steam boiler 3 is arranged above the high-temperature flue gas passage 2 and is connected to the waste heat steam boiler 3 through eight heat exchange fins 4. The left end of the waste heat steam boiler 3 is provided with a water inlet 6, the water inlet 6 is connected to the water inlet pipe 5, and the right end is provided with a first blowdown port 7. The first blowdown port 7 is connected to the first blowdown pipe 8, and the first blowdown pipe 8 is provided with a first blowdown valve 9. The water inlet pipe 5 is provided with a water inlet valve 10. The waste heat steam boiler 3 is provided with two steam outlet valves 11, two safety valves 12, and a pressure gauge 13.

[0022] The waste heat steam boiler 3 is provided with a water level measuring device; the water level measuring device is connected to the salinity optical measuring device through a pipeline, and a globe valve 21 is provided on the pipeline.

[0023] The water level measuring device, the safety valve 12, the water inlet valve 10, the first blowdown valve 9, the steam outlet valve 11, the salinity optical measuring device, and the globe valve 21 are all connected to the control device.

[0024] The bottom end of the waste heat steam boiler 3 is provided with a second blowdown port 14, and the second blowdown port 14 is connected to the second blowdown pipe 15. The second blowdown pipe 15 is provided with a second blowdown valve 16, and the second blowdown valve 16 is connected to the control device. A certain amount of moisture exists in the high-temperature sulfur dioxide flue gas, and the heat of the high-temperature sulfur dioxide flue gas can be utilized. During the waste heat utilization process, the sulfur dioxide gas rapidly cools down, and sulfur dioxide will react with water to form sulfurous acid solution, which can be discharged through the second blowdown valve 16 to improve the purity of the sulfur dioxide gas.

[0025] The water level measuring device includes an electrode water level gauge 17, and the electrode water level gauge 17 is connected to the waste heat steam boiler 3 through a pipeline. The electrode water level gauge 17 is arranged at the rear side of the waste heat steam boiler 3.

[0026] The water level measuring device includes a two-color water level gauge 18, and the two-color water level gauge 18 is connected to the waste heat steam boiler 3 through a pipeline. The two-color water level gauge 18 is arranged at the front side of the waste heat steam boiler 3.

[0027] The water level measuring device includes a flat water level gauge 19, and the flat water level gauge 19 is connected to the waste heat steam boiler 3 through a pipeline. The flat water level gauge 19 is arranged at the rear side of the electrode water level gauge 17.

[0028] The optical salinity measuring device includes a salinity prism refractometer 20, and the flat water level gauge 19 is connected to the salinity prism refractometer 20 through a pipeline, and a stop valve 21 is arranged on the pipeline.

[0029] The longitudinal section of the warm flue gas passage is annular, and the central axis of the warm flue gas passage is arranged horizontally.

[0030] The longitudinal section of the waste heat steam boiler 3 is annular, and the central axis of the waste heat steam boiler 3 is arranged horizontally.

[0031] A water level measuring device is provided on the waste heat steam boiler, and the water level measuring device is connected to the optical salinity measuring device; the water level measuring device, the optical salinity measuring device, the pressure measuring device, the safety valve, the water inlet valve, the first blowdown valve, the safety valve, the steam outlet valve, and the first blowdown valve 9 are all connected to the control device. When the waste heat steam boiler generates steam, when the optical salinity measuring device measures that the salinity of the water in the waste heat steam boiler exceeds the standard, the first blowdown valve opens; when the water level measuring device measures that the water level in the waste heat steam boiler is lower than the set value, the water inlet valve opens; when the pressure measuring device measures that the pressure in the waste heat steam boiler exceeds the set value, each safety valve opens, and the waste heat steam boiler is safe to use.

[0032] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A high-temperature sulfur dioxide flue gas waste heat utilization system, characterized in that: The invention comprises a control device, a combustion chamber (1), a high-temperature flue gas passage (2), and a waste heat steam boiler (3), wherein the combustion chamber (1) is connected to the high-temperature flue gas passage (2), and the waste heat steam boiler (3) is arranged above the high-temperature flue gas passage (2) and is connected to the waste heat steam boiler (3) through a plurality of heat exchange fins (4); a water inlet (6) is provided at one end of the waste heat steam boiler (3), the water inlet (6) is connected to a water inlet pipe (5), and a first sewage outlet (7) is provided at the other end; the first sewage outlet (7) is connected to a first sewage outlet pipe (8), and a first sewage outlet valve (9) is provided on the first sewage outlet pipe (8); a water inlet valve (10) is provided on the water inlet pipe (5); and a plurality of steam outlet valves (11), a plurality of safety valves (12), and a pressure gauge (13) are provided on the waste heat steam boiler (3); The waste heat steam boiler (3) is provided with a water level measuring device; the water level measuring device is connected to the salt content optical measuring device via a pipeline, and a stop valve (21) is provided on the pipeline; The water level measuring device, the safety valve (12), the water inlet valve (10), the first sewage discharge valve (9), the steam outlet valve (11), the salt content optical measuring device, and the stop valve (21) are all connected to the control device.

2. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: A second sewage outlet (14) is provided at the bottom end of the waste heat steam boiler (3), and the second sewage outlet (14) is connected to a second sewage pipe (15); the second sewage pipe (15) is provided with a second sewage valve (16), and the second sewage valve (16) is connected to a control device.

3. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: The water level measuring device comprises an electrode water level gauge (17), and the electrode water level gauge (17) is connected to the waste heat steam boiler (3) through a pipeline.

4. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: The water level measuring device comprises a two-color water level gauge (18), and the two-color water level gauge (18) is connected to the waste heat steam boiler (3) through a pipeline.

5. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: The water level measuring device comprises a flat plate water level gauge (19), and the flat plate water level gauge (19) is connected to the waste heat steam boiler (3) through a pipeline.

6. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 5, characterized in that: The optical salt content measuring device comprises a salinity prism refractometer (20); a flat water level meter (19) is connected to the salinity prism refractometer (20) via a pipeline, and a stop valve (21) is provided on the pipeline.

7. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: The longitudinal section of the warm flue gas passage is in a circular ring shape, and the central axis of the warm flue gas passage is arranged horizontally.

8. A high-temperature sulfur dioxide flue gas waste heat utilization system as claimed in claim 1, characterized in that: The longitudinal cross-section of the waste heat steam boiler (3) is in the shape of a circular ring, and the central axis of the waste heat steam boiler (3) is arranged transversely.

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