A sulfur-containing gas recovery and treatment device for coal-fired boilers

Abstract

This invention relates to the field of gas treatment, and more particularly to a sulfur-containing gas recovery and treatment device for coal-fired boilers. The invention provides a sulfur-containing gas recovery and treatment device for coal-fired boilers capable of treating high-concentration sulfur-containing gases. The invention includes a housing, with an inlet pipe connected to one side and an outlet pipe connected to the other side. The outlet pipe is located at a relatively high height. A control panel is located on one side of the outer wall of the housing. A gas detector is connected to both the inlet and outlet pipes, and the control panel is electrically connected to the gas detectors. A waste liquid tank is connected to one side of the housing, and a sponge block is fixedly connected to the center of the housing. This invention, through the use of a fixed nozzle and a backup nozzle, enables more efficient treatment of high-concentration sulfur-containing gases; the backup nozzle is only activated when the sulfur-containing gas concentration is high.

Description

Technical Field

[0001] This invention relates to the field of gas treatment, and more particularly to a sulfur-containing gas recovery and treatment device for coal-fired boilers. Background Technology

[0002] In industries such as steel, coking, and natural gas, sulfur in gases is undesirable. Its corrosiveness causes great trouble for gas transmission pipelines, and its environmental pollution is a major headache in today's world where environmental protection requirements are so stringent.

[0003] During coal processing, some sulfur-containing gases are generated. Coke oven gas, whose main components are hydrogen, methane, and carbon monoxide, is produced. The sulfur content of coke oven gas varies depending on the sulfur content of the coal used for coking. During coking, the sulfur in the coal is mainly released into the coke oven gas as hydrogen sulfide, with a hydrogen sulfide content ranging from 6-20 g / m³. 3 Coal gasification produces gas primarily composed of carbon monoxide and hydrogen. Its sulfur content varies depending on the sulfur content of the coal used for gasification, ranging from 1 to 31 g / m³. 3 Organic sulfur content is 100-1000 mg / m³ 3 .

[0004] In existing technologies, sulfur-containing gases are generally treated by absorbing them with solutions of metal ion compounds. However, the concentration of sulfide compounds in sulfur-containing gases produced by heavy industry is unstable. When the concentration of sulfide compounds in sulfur-containing gases is high, it is difficult for general treatment devices to completely treat them, which will also have a significant impact on the subsequent collection and treatment of gases. Summary of the Invention

[0005] In order to overcome the shortcomings of existing technologies in handling sulfur-containing gases produced by coal-fired boilers with high concentrations of sulfides, the technical problem of the present invention is to provide a sulfur-containing gas recovery and treatment device for coal-fired boilers that can handle high-concentration sulfur-containing gases.

[0006] A sulfur-containing gas recovery and treatment device for a coal-fired boiler includes an outer shell, an inlet pipe connected to one side of the shell, and an outlet pipe connected to the other side of the shell. The outlet pipe is located at a relatively high height within the shell. A control panel is provided on one side of the outer wall of the shell. A gas detector is connected to both the inlet and outlet pipes, and the control panel is electrically connected to the gas detector. A waste liquid tank is connected to one side of the shell. A sponge block is fixedly connected to the middle of the shell. An inlet pipe is connected to the upper side of the shell. The inlet pipe is segmented and connected to a first preset number of fixed nozzles and a second preset number of standby nozzles. A solenoid valve is provided on the inlet pipe, located between the fixed nozzles and the standby nozzles. The liquid inlet direction is from bottom to top. The standby nozzles are located above the fixed nozzles. The standby nozzles are indirectly controlled to start by the gas detector when the sulfur-containing gas concentration is high. The lower side of the shell is connected to the outlet pipe through a return pipe. The treated gas is returned to the shell for secondary treatment through the return pipe based on the detection result of the gas detector. An air pump is provided on the outlet pipe and is electrically connected to the control panel.

[0007] In a preferred embodiment of the present invention, a first liquid guiding plate and a second liquid guiding plate are connected inside the outer shell below the sponge block. The second liquid guiding plate is below the first liquid guiding plate. The first liquid guiding plate is composed of evenly arranged inclined plates, and the second liquid guiding plate is composed of evenly arranged liquid guiding grooves. The second liquid guiding plate is inclined as a whole. The lower end of the liquid guiding groove is connected to the waste liquid tank. The gap between the inclined plate and the liquid guiding groove in the vertical direction corresponds to the gap between the inclined plate and the liquid guiding groove. A second scraper is slidably provided on the second liquid guiding plate. A sliding frame is connected to the second scraper. A screw is fixedly connected to the bottom of the first liquid guiding plate. The second scraper is threadedly connected to the screw.

[0008] In a preferred embodiment of the present invention, the sliding frame is rotatably connected to a first scraper via a bidirectional hinge rod. The first scraper contacts the bottom of the sponge block, and a guide frame is slidably provided at the bottom of the first scraper. A compression spring is connected between the first scraper and the guide frame. A motor is fixedly provided in the lower part of the outer shell. The control panel is electrically connected to the motor, and the motor and the screw are connected by a pulley group for transmission.

[0009] In a preferred embodiment of the present invention, the air intake pipe is provided with a collection box and a filter plate, the filter plate is located above the collection box, and a scraper is rotatably provided on the filter plate, the scraper being connected to the output shaft of the motor.

[0010] In a preferred embodiment of the present invention, an electronic switch is provided on the air outlet pipe, and the electronic switch is electrically connected to the control panel.

[0011] In a preferred embodiment of the present invention, the second scraper is provided with the same number of filter screens as the liquid guiding groove.

[0012] In a preferred embodiment of the present invention, a waste storage bin is provided inside the outer shell on the side opposite to the waste liquid tank. The waste storage bin and the liquid guiding channel are at the same horizontal level, and a baffle is inserted into the outside of the waste storage bin.

[0013] In a preferred embodiment of the present invention, the number of liquid guiding grooves is one more than the number of inclined plates.

[0014] In a preferred embodiment of the present invention, a detachable filtration device is installed inside the waste liquid tank.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention can treat high-concentration sulfur-containing gases more efficiently by using a fixed nozzle and a spare nozzle. The spare nozzle is only turned on when the concentration of sulfur-containing gases is high, which is more economical than using a large amount of solution directly.

[0016] 2. This device can perform secondary testing on the gas after the first treatment, and perform secondary treatment on the gas that does not meet the requirements of the secondary testing. Attached Figure Description

[0017] Figure 1 This is a first-view three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a second-view three-dimensional structural diagram of the present invention.

[0019] Figure 3 This is the front view of the present invention.

[0020] Figure 4 This is a partial front view of the present invention.

[0021] Figure 5 This is an enlarged view of invention A.

[0022] Figure 6 This is a schematic diagram of the first partial three-dimensional structure of the present invention.

[0023] Figure 7 This is an enlarged view of invention B.

[0024] Figure 8 This is a schematic diagram of the second partial three-dimensional structure of the present invention.

[0025] In the diagram: 1. Outer shell, 2. Inlet pipe, 3. Outlet pipe, 30. Electronic switch, 4. Control panel, 5. Sponge block, 6. Liquid inlet pipe, 60. Fixed nozzle, 61. Spare nozzle, 62. Solenoid valve, 7. Waste liquid tank, 8. First scraper, 80. Two-way hinge rod, 81. Sliding frame, 82. Guide frame, 83. Compression spring, 9. First guide plate, 90. Second guide plate, 10. Screw, 100. Second scraper, 101. Pulley assembly, 102. Filter screen, 11. Motor, 12. Collection box, 120. Filter plate, 121. Scraper, 13. Gas detector, 14. Air pump, 140. Return pipe, 15. Baffle. Detailed Implementation

[0026] Although the invention may be described with respect to specific applications or industries, those skilled in the art will recognize its broader applicability. Those skilled in the art will understand that terms such as "above," "below," "upward," "downward," etc., are used to describe the drawings and not to indicate a limitation on the scope of the invention as defined by the appended claims. Any numerical designations such as "first" or "second" are merely illustrative and not intended to limit the scope of the invention in any way.

[0027] A sulfur-containing gas recovery and treatment device for a coal-fired boiler, such as Figure 1-8 As shown, the device includes an outer casing 1, an air inlet pipe 2 connected to one side of the outer casing 1, and an air outlet pipe 3 connected to the other side of the outer casing 1. The air outlet pipe 3 is located at a relatively high height of the outer casing 1. A control panel 4 is provided on one side of the outer wall of the outer casing 1. A gas detector 13 is connected to both the air inlet pipe 2 and the air outlet pipe 3. The control panel 4 is electrically connected to the gas detector 13. A waste liquid tank 7 is connected to the side of the outer casing 1 below the air outlet pipe 3. A sponge block 5 is fixedly connected to the middle of the inner part of the outer casing 1. An inlet pipe 6 is connected to the upper side of the inner part of the outer casing 1. The inlet pipe 6 is segmented and connected to two fixed nozzles 60 and a spare nozzle 61. A solenoid valve 62 is provided on the inlet pipe 6. The solenoid valve 62 is located between the fixed nozzles 60 and the spare nozzle 61. The liquid inlet direction of the inlet pipe 6 is from bottom to top. The spare nozzle 61 is located above the fixed nozzles 60. The lower side of the inner part of the outer casing 1 is connected to the air outlet pipe 3 through a return pipe 140. An air pump 14 is provided on the air outlet pipe 3. The air pump 14 is electrically connected to the control panel 4.

[0028] like Figure 5 , Figure 6 and Figure 8As shown, a first liquid guide plate 9 and a second liquid guide plate 90 are connected inside the outer shell 1, located below the sponge block 5. The second liquid guide plate 90 is below the first liquid guide plate 9. The first liquid guide plate 9 is composed of evenly arranged inclined plates, and the second liquid guide plate 90 is composed of evenly arranged liquid guide grooves. The second liquid guide plate 90 is inclined as a whole. The lower end of the liquid guide groove is connected to the waste liquid tank 7. The gap between the inclined plates and the liquid guide grooves in the vertical direction corresponds to the gap between them. A second scraper 100 is slidably provided on the second liquid guide plate 90. A sliding frame 81 is connected to the second scraper 100. A screw 10 is fixedly connected to the bottom of the first liquid guide plate 9. The second scraper 100 is threadedly connected to the screw 10.

[0029] like Figure 7 As shown, the sliding frame 81 is rotatably connected to the first scraper 8 via a two-way hinge rod 80. The first scraper 8 contacts the bottom of the sponge block 5. A guide frame 82 is slidably provided at the bottom of the first scraper 8. A compression spring 83 is connected between the first scraper 8 and the guide frame 82. A motor 11 is fixedly provided in the lower part of the outer shell 1. The control panel 4 is electrically connected to the motor 11. The motor 11 and the screw 10 are connected by a pulley group 101.

[0030] The air intake pipe 2 is provided with a collection box 12 and a filter plate 120. The filter plate 120 is located above the collection box 12. A scraper 121 is rotatably provided on the filter plate 120. The scraper 121 is connected to the output shaft of the motor 11.

[0031] An electronic switch 30 is provided on the air outlet pipe 3, and the electronic switch 30 is electrically connected to the control panel 4.

[0032] The second scraper 100 is provided with the same number of filter screens 102 as the liquid guiding groove.

[0033] Inside the outer shell 1, on the side opposite to the waste liquid tank 7, there is a waste hopper. The waste hopper and the liquid guiding channel are at the same horizontal level. A baffle 15 is inserted into the outside of the waste hopper.

[0034] The waste liquid tank 7 is equipped with a detachable filtration device.

[0035] Before operation, the inlet pipe 6 must be connected to the solution required for treating sulfur-containing gas. Initially, both the solenoid valve 62 and the air pump 14 are closed. During operation, the sulfur-containing gas is introduced into the outer casing 1 through the air inlet pipe 2. Simultaneously, the inlet pipe 6 draws the solution for treating the sulfur-containing gas through an external pressure device. The solution is sprayed from the fixed nozzle 60 and enters the sponge block 5. The filter plate 120 at the air inlet pipe 2 performs preliminary filtration of the sulfur-containing gas. Afterward, the gas enters the outer casing 1 and rises. When it passes through the sponge block 5, it reacts with the internal solution. Some solid substances generated by the reaction remain on the lower surface of the sponge block 5. The motor 11 is then turned on, and its forward and reverse rotation is controlled. This controls the reciprocating movement of the first scraper 8 and the second scraper 100. The first scraper 8 scrapes off the solid impurities on the lower surface of the sponge block 5. During the sliding process of the guide frame 82, it is first blocked by the inner wall of the outer shell 1. The sliding frame 81 continues to move and moves the first scraper 8 downward through the bidirectional hinge rod 80 to push the scraped solid impurities downward. The solid impurities and waste liquid fall into the liquid guide tank together. Since the inclined plate blocks the gap between the liquid guide tanks above, the solid impurities and waste liquid will not fall into the lower part of the outer shell 1. The solid impurities and waste liquid will be pushed into the waste bin and waste liquid tank 7 in a small amount of mixture. The treated gas will be introduced into the external receiving and collecting device through the gas outlet pipe 3.

[0036] In this embodiment, the solution used to treat sulfur-containing gas contains 15% lime water. The gas detector 13 in the inlet pipe 2 first detects the incoming gas. If the sulfur dioxide content in the sulfur-containing gas is less than 10 g / m³, the solution will be tested. 3 At this time, the solenoid valve will not be opened, and the solution will only be sprayed from the two fixed nozzles 60; if the sulfur dioxide content in the sulfur-containing gas is higher than 10 g / m³ 3 When the solenoid valve 62 is opened via the control panel 4, the solution will also be sprayed out from the standby nozzle 61. Since the treated gas will be sprayed with solution during its ascent, the fixed nozzle 60 and the standby nozzle 61 working together can improve the efficiency of the solution's action on the gas.

[0037] The gas detector 13 in the outlet pipe 3 will perform a second test on the gas. If the sulfur dioxide content in the treated gas does not meet the emission requirements, the electronic switch 30 will be turned off and the air pump 14 will be turned on through the control panel 4. The air pump 14 will draw the gas treated in the first treatment back into the lower part of the outer casing 1 for a second treatment. This process continues until the treated gas meets the requirements. Once the electronic switch is turned on, the gas can be discharged.

[0038] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A sulfur-containing gas recovery and treatment device for a coal-fired boiler, characterized in that: It includes an outer shell (1), an air inlet pipe (2) connected to one side of the outer shell (1), and an air outlet pipe (3) connected to the other side of the outer shell (1). The air outlet pipe (3) is located at a relatively high height of the outer shell (1). A control panel (4) is provided on one side of the outer wall of the outer shell (1). A gas detector (13) is connected to both the air inlet pipe (2) and the air outlet pipe (3). The control panel (4) is electrically connected to the gas detector (13). A waste liquid tank (7) is connected to one side of the outer shell (1). A sponge block (5) is fixedly connected to the middle of the inner part of the outer shell (1). An inlet pipe (6) is connected to the upper side of the inner part of the outer shell (1). The inlet pipe (6) is segmented and connected to a first preset number of fixed nozzles (60) and a second preset number of spare nozzles (61). A solenoid valve (62) is provided on the liquid pipe (6). The solenoid valve (62) is located between the fixed nozzle (60) and the standby nozzle (61). The liquid inlet direction of the liquid inlet pipe (6) is from bottom to top. The standby nozzle (61) is located above the fixed nozzle (60). When the sulfur gas concentration is high, the standby nozzle (61) is indirectly controlled by the gas detector (13) to start. The lower part of the inner shell (1) is connected to the gas outlet pipe (3) through the return pipe (140). The gas after treatment is determined by the detection result of the gas detector (13) to return to the inner shell (1) through the return pipe (140) for secondary treatment. A gas pump (14) is provided on the gas outlet pipe (3). The gas pump (14) is electrically connected to the control panel (4). The outer shell (1) is connected to a first liquid guide plate (9) and a second liquid guide plate (90) located below the sponge block (5). The second liquid guide plate (90) is below the first liquid guide plate (9). The first liquid guide plate (9) is composed of evenly arranged inclined plates, and the second liquid guide plate (90) is composed of evenly arranged liquid guide grooves. The second liquid guide plate (90) is inclined as a whole. The lower end of the liquid guide groove is connected to the waste liquid tank (7). The gap between the inclined plate and the liquid guide groove in the vertical direction corresponds to the gap between the inclined plate and the liquid guide groove. A second scraper (100) is slidably provided on the second liquid guide plate (90). A sliding frame (81) is connected to the second scraper (100). A screw (10) is fixedly connected to the bottom of the first liquid guide plate (9). The second scraper (100) is threadedly connected to the screw (10). The sliding frame (81) is rotatably connected to the first scraper (8) via a two-way hinge rod (80). The first scraper (8) contacts the bottom of the sponge block (5). The bottom of the first scraper (8) is slidably provided with a guide frame (82). A compression spring (83) is connected between the first scraper (8) and the guide frame (82). A motor (11) is fixedly provided in the lower part of the outer shell (1). The control panel (4) is electrically connected to the motor (11). The motor (11) and the screw (10) are connected by a pulley group (101). The air intake pipe (2) is provided with a collection box (12) and a filter plate (120). The filter plate (120) is located above the collection box (12). A scraper (121) is rotatably provided on the filter plate (120). The scraper (121) is connected to the output shaft of the motor (11).

2. A sulfur-containing gas recovery and treatment device for a coal-fired boiler according to claim 1, characterized in that: An electronic switch (30) is provided on the air outlet pipe (3), and the electronic switch (30) is electrically connected to the control panel (4).

3. A sulfur-containing gas recovery and treatment device for a coal-fired boiler according to claim 2, characterized in that: The second scraper (100) is provided with the same number of filter screens (102) as the liquid guiding groove.

4. A sulfur-containing gas recovery and treatment device for a coal-fired boiler according to claim 1, characterized in that: Inside the outer shell (1), on the side opposite to the waste liquid tank (7), there is a waste hopper. The waste hopper and the liquid guide tank are at the same horizontal level. A baffle (15) is inserted into the outside of the waste hopper.

5. A sulfur-containing gas recovery and treatment device for a coal-fired boiler according to claim 1, characterized in that: The number of liquid guiding channels is one more than the number of inclined plates.

6. A sulfur-containing gas recovery and treatment device for a coal-fired boiler according to claim 1, characterized in that: The waste liquid tank (7) is equipped with a detachable filtration device.

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