Coal gas fine desulfurization integrated tower with combined dust removal

Abstract

The application discloses a coal gas fine desulfurization integrated tower with a combined dust removal function, which comprises a dust removal and dechlorination unit, a hydrolysis unit and a desulfurization unit.

Description

Technical Field

[0001] This invention relates to the field of desulfurization technology, specifically to an integrated coal gas fine desulfurization tower with combined dust removal. Background Technology

[0002] Chinese patent CN210656825U discloses a coke oven gas desulfurization tower that effectively improves the desulfurization effect through a dual desulfurization mechanism consisting of a desulfurization pump and a wet flue gas desulfurization chamber. The gas inlet pipe is equipped with a gas inlet located at the upper end of the gas inlet pipe. A connecting plate is welded to the gas inlet pipe and is located above the gas inlet pipe. The connecting plate is fixedly equipped with a connection hole. The desulfurization slurry tank is located on the lower surface of the desulfurization chamber. At the same time, the designed booster fan can effectively improve the air flow inside the desulfurization tower, thereby improving the desulfurization efficiency of the coke oven gas desulfurization tower.

[0003] In existing technologies, desulfurization efficiency is achieved by increasing the airflow inside the desulfurization tower. However, existing desulfurization devices only desulfurize by filling desulfurizing agents, which has the problems of limited desulfurization effect and incomplete desulfurization. Summary of the Invention

[0004] The purpose of this invention is to solve the problems mentioned above in the background technology and to propose an integrated coal gas desulfurization tower with combined dust removal.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An integrated coal gas desulfurization tower with combined dust removal features includes:

[0007] The dust removal and dechlorination unit includes a dust removal and dechlorination tank, which contains a dechlorination and dust removal agent;

[0008] A hydrolysis unit, including a hydrolysis unit tank; the inner cavity of the hydrolysis unit tank is provided with a hydrolyzing agent layer;

[0009] A desulfurization unit, including a desulfurization unit tank; the inner cavity of the desulfurization unit tank is provided with a desulfurizing agent layer;

[0010] The dust removal and dechlorination tank, the hydrolysis unit tank, and the desulfurization unit tank are connected in sequence via connecting pipes;

[0011] The horizontal parts of the nitrogen pipe and water pipe of the cleaning component are located inside the housing. The nitrogen pipe is connected to the nitrogen nozzle, and the water pipe is connected to the water nozzle.

[0012] The drive unit controls the reciprocating movement of the cleaning component;

[0013] Nitrogen pipes and clean water pipes run through the side wall of the dust removal and dechlorination tank.

[0014] As a further aspect of the present invention: the driving component includes a driving motor, which is disposed on the outer wall of the dust removal and dechlorination tank. The output end of the driving motor is connected to a lead screw, which is rotatably installed inside the dust removal and dechlorination tank. A mounting seat is threaded onto the lead screw, and the mounting seat is connected to a limiting rod. The limiting rod is installed on the inner wall of the dust removal and dechlorination tank. A rotary motor is disposed on the mounting seat, and the output end of the rotary motor is connected to a mounting plate via a pulley. The mounting plate is rotatably installed on the mounting seat and is connected to the housing.

[0015] As a further aspect of the present invention: an air inlet pipe is provided at the bottom inlet of the dust removal and dechlorination tank, a first valve is provided on the air inlet pipe, and a dust meter is provided on the air inlet pipe.

[0016] As a further aspect of the present invention, the inner cavity of the hydrolysis unit tank is also provided with a partition.

[0017] As a further aspect of the present invention: the hydrolysate layer is arranged horizontally, while the partition is arranged vertically.

[0018] As a further aspect of the present invention: the connecting pipe includes:

[0019] The top outlet of the dust removal and dechlorination tank is connected to the top inlet of the hydrolysis unit tank through the first connecting pipe. The two ends of the first connecting pipe are respectively equipped with a third valve and a fourth valve.

[0020] The top outlet of the hydrolysis unit tank is connected to the top inlet of the desulfurization unit tank via the second connecting pipe. The second connecting pipe is equipped with a fifth valve and a sixth valve at its two ends.

[0021] As a further embodiment of the present invention: the third valve is located inside the dust removal and dechlorination tank, and the fourth valve is located inside the hydrolysis unit tank.

[0022] As a further embodiment of the present invention: the fifth valve is located inside the hydrolysis unit tank, and the sixth valve is located inside the desulfurization unit tank.

[0023] As a further aspect of the present invention, the bottom of the dust removal and dechlorination tank, the hydrolysis unit tank, and the desulfurization unit tank are all equipped with ash discharge valves.

[0024] The beneficial effects of this invention are:

[0025] The coal gas first enters the dust removal and dechlorination tank through the inlet pipe. The dechlorination and dust removal agent in the dust removal and dechlorination tank intercepts the dust in the coal gas and removes the chlorine element in the coal gas. Then it enters the hydrolysis unit tank through the first connecting pipe.

[0026] Due to the baffles inside the hydrolysis unit tank, the gas purified in the first step flows from top to bottom along the channel on the side of the hydrolysis unit tank closest to the dust removal and dechlorination tank. It then passes through the hydrolysing agent layer to convert carbonyl sulfur and CS2 in the gas into H2S. After that, it flows from bottom to top from the bottom of the hydrolysis unit tank, and passes through the hydrolysing agent layer again to convert carbonyl sulfur and CS2 in the gas into H2S. Then, the gas purified in the second step enters the desulfurization unit tank along the second connecting pipe.

[0027] After the second step of purification, the coal gas passes through the desulfurization unit tank from top to bottom, where the desulfurizing agent layer absorbs the H2S in the coal gas. Finally, the purified flue gas is discharged from the seventh valve. This invention uses a dust removal and dechlorination unit, a hydrolysis unit, and a desulfurization unit to sequentially perform dust removal, dechlorination, hydrolysis, and desulfurization purification on the coal gas. Through triple purification, the efficiency of coal gas desulfurization treatment will be greatly improved.

[0028] The cleaning device of the present invention can connect nitrogen dust removal and water dust removal together, reducing the space occupied in the dechlorination dust removal tank. In addition, the drive component can control its movement, making the dust removal efficiency of the dechlorination layer higher and more comprehensive. Furthermore, the two dust removal modes can be switched, with unidirectional movement for nitrogen dust removal and return movement for water washing dust removal, thereby further improving the cleaning and dust removal efficiency. Attached Figure Description

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] Figure 1 This is a schematic diagram of the structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the dust removal and dechlorination tank of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of the cleaning component of the present invention;

[0033] Figure 4 This is a schematic diagram of the structure of the driving component of the present invention.

[0034] In the diagram: 1. Dust removal and dechlorination tank; 2. Hydrolysis unit tank; 3. Desulfurization unit tank; 4. First connecting pipe; 5. Second connecting pipe; 6. Seventh valve; 7. Ash discharge valve; 11. Air inlet pipe; 12. First valve; 13. Dust collector; 14. Dechlorination and dust removal agent; 15. Cleaning device; 21. Hydrolyzing agent layer; 22. Baffle plate; 31. Desulfurizing agent layer; 41. Third valve; 42. Fourth valve; 51. Fifth valve; 52. Sixth valve;

[0035] 151. Inlet pipe; 152. Cleaning component; 153. Drive component; 1521. Housing; 1522. Nitrogen nozzle; 1523. Nitrogen pipe; 1524. Clean water nozzle; 1525. Clean water pipe; 1531. Drive motor; 1532. Limit rod; 1533. Lead screw; 1534. Rotary motor; 1535. Pulley; 1536. Mounting base; 1537. Mounting plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figure 1 As shown, the present invention is an integrated coal gas desulfurization tower with combined dust removal, including a dust removal and dechlorination unit, a hydrolysis unit and a desulfurization unit;

[0039] The dust removal and dechlorination unit is connected to the hydrolysis unit, and the hydrolysis unit is connected to the desulfurization unit.

[0040] The dust removal and dechlorination unit includes a dust removal and dechlorination tank 1, which contains a dechlorination and dust removal agent 14. The dechlorination and dust removal agent 14 is arranged in two layers, upper and lower. A cleaning device 15 is provided on each layer of the dechlorination and dust removal agent 14. The cleaning device 15 includes two methods: nitrogen backflushing and water washing. The nitrogen backflushing method uses a nitrogen pipe connected to a gas source, and the water washing method uses a water pipe connected to a water source. The nitrogen pipe is located above the water pipe. Under normal conditions, nitrogen backflushing is used according to the pressure difference of the dust removal and dechlorination layers. When the dust removal and dechlorination unit is stopped, the lower layer is rinsed with water.

[0041] An air inlet pipe 11 is installed at the bottom inlet of the dust removal and dechlorination tank 1. A first valve 12 is installed on the air inlet pipe 11. The first valve 12 is required to be 100% sealed. When the integrated tower malfunctions, this valve is closed, putting the integrated tower unit offline for easy maintenance without affecting production. A dust meter 13 is also installed on the air inlet pipe 11 to detect the dust concentration in the coal gas. If the dust concentration in the incoming coal gas exceeds 15 mg / Nm³, the meter will detect the dust. 3 Interlock alarm. If the dust concentration in the gas exceeds 20 mg / Nm³. 3 The first valve 12 and the seventh valve 6 are interlocked and closed, thereby shutting down the integrated tower unit;

[0042] The top outlet of the dust removal and dechlorination tank 1 is connected to the top inlet of the hydrolysis unit tank 2 through the first connecting pipe 4. The two ends of the first connecting pipe 4 are respectively equipped with a third valve 41 and a fourth valve 42. The third valve 41 is located inside the dust removal and dechlorination tank 1, and the fourth valve 42 is located inside the hydrolysis unit tank 2. The main function of the third valve 41 and the fourth valve 42 is to isolate the dust removal and dechlorination unit and the hydrolysis unit. If either unit has a problem, the third valve 41 and the fourth valve 42 will be closed, which will play a dual protection role.

[0043] The dechlorination and dust removal agent 14 is mainly composed of a mixture of calcium oxide, zinc oxide, and aluminum oxide. The space velocity of the gas at the dechlorination and dust removal agent 14 is controlled at 1000. -1 h-3000m / mi n -1 h, and the loading amount of dechlorination and dust removal agent 14 is calculated based on the designed flue gas volume. The function of dechlorination and dust removal agent 14 is to intercept dust in the coal gas and remove chlorine from the coal gas, and protect the hydrolysate.

[0044] The hydrolysis unit includes a hydrolysis unit tank 2, a hydrolysant layer 21, and a partition 22; the inner cavity of the hydrolysis unit tank 2 is provided with a hydrolysant layer 21, and two sets of hydrolysant layers 21 are arranged above and below, and the inner cavity of the hydrolysis unit tank 2 is also provided with a partition 22.

[0045] The top outlet of the hydrolysis unit tank 2 is connected to the top inlet of the desulfurization unit tank 3 through the second connecting pipe 5. The two ends of the second connecting pipe 5 are respectively equipped with a fifth valve 51 and a sixth valve 52. The fifth valve 51 is located inside the hydrolysis unit tank 2, and the sixth valve 52 is located inside the desulfurization unit tank 3. The main function of the fifth valve 51 and the sixth valve 52 is to isolate the hydrolysis and desulfurization units. If either unit has a problem, the fifth valve 51 and the sixth valve 52 will be closed, which will play a dual protection role.

[0046] The hydrolysate layer 21 is horizontally arranged, while the partition 22 is vertically arranged.

[0047] The hydrolysant is mainly composed of Al2O3, TiO2, K2O, etc. The amount of hydrolysant loaded is calculated based on the designed flue gas volume. Its function is to convert carbonyl sulfur and CS2 in the coal gas into H2S. 1. COS + H2O → H2S + CO2; 2. CS2 + 2H2O → 2H2S + CO2.

[0048] The desulfurization unit includes a desulfurization unit tank 3 and a desulfurizing agent layer 31. The desulfurization unit tank 3 has a desulfurizing agent layer 31 inside, and there are two sets of desulfurizing agent layers 31. A seventh valve 6 is installed at the bottom of the desulfurization unit tank 3. The seventh valve 6 is an exhaust valve. The seventh valve 6 is required to be 100% sealed. When the integrated tower fails, the valve is closed, so that the integrated tower unit is offline, which is convenient for personnel to maintain and does not affect production.

[0049] Among them, the desulfurizer layer 31 is set horizontally. The desulfurizer can be activated carbon or calcium-based desulfurizer. The amount of desulfurizer loaded is calculated according to the designed flue gas volume and H2S content. Its function is to absorb H2S in the coal gas and finally discharge the clean coal gas from the system.

[0050] Furthermore, ash discharge valves 7 are installed at the bottom of the dust removal and dechlorination tank 1, the hydrolysis unit tank 2, and the desulfurization unit tank 3. The ash discharge valve 7 of the dust removal and dechlorination tank 1 is used to discharge the dust removal and dechlorination agent and dust in the coal gas. The ash discharge valve 7 of the hydrolysis unit tank 2 is used to discharge the hydrolyzing agent and dust in the coal gas. The ash discharge valve 7 of the desulfurization unit tank 3 is used to discharge the desulfurizing agent and dust in the coal gas.

[0051] During operation, the coal gas first enters the dust removal and dechlorination tank 1 along the inlet pipe 11. The dechlorination and dust removal agent 14 in the dust removal and dechlorination tank 1 intercepts the dust in the coal gas and removes the chlorine element in the coal gas. Then it enters the hydrolysis unit tank 2 along the first connecting pipe 4.

[0052] Due to the baffle 22 inside the hydrolysis unit tank 2, the gas purified in the first step will flow from top to bottom along the channel on the side of the hydrolysis unit tank 2 closest to the dust removal and dechlorination tank 1, and will be converted into H2S by the carbonyl sulfur and CS2 in the gas through the hydrolysing agent layer 21. Then it will flow from bottom to top from the bottom of the hydrolysis unit tank 2, and will be converted into H2S again by the hydrolysing agent layer 21. Then the gas purified in the second step will enter the desulfurization unit tank 3 along the second connecting pipe 5.

[0053] After the second step of purification, the coal gas flows from top to bottom through the desulfurization unit tank 3 and the desulfurizing agent layer 31 absorbs the H2S in the coal gas. Finally, the purified flue gas is discharged from the seventh valve 6.

[0054] Example 2

[0055] Based on the above embodiment 1, the cleaning device 15 includes an inlet pipe 151, a cleaning component 152, and a driving component 153;

[0056] The inlet pipe 151 penetrates the side wall of the dust removal and dechlorination tank 1. The inlet pipe 151 adopts a telescopic pipe structure and includes a nitrogen pipe 1523 and a clean water pipe 1525. The nitrogen pipe 1523 and the clean water pipe 1525 are connected together.

[0057] The cleaning component 152 includes a housing 1521, a nitrogen nozzle 1522, a nitrogen pipe 1523, a clean water nozzle 1524, and a clean water pipe 1525. The nitrogen pipe 1523 and the clean water pipe 1525 have an L-shaped structure. The horizontal parts of the nitrogen pipe 1523 and the clean water pipe 1525 are located inside the housing 1521. The housing 1521 is sleeved on the nitrogen pipe 1523 and the clean water pipe 1525 and is connected to the nitrogen pipe 1523 and the clean water pipe 1525 respectively. The nitrogen pipe 1523 is connected to the nitrogen nozzle 1522, and the clean water pipe 1525 is connected to the clean water nozzle 1524.

[0058] The driving component 153 includes a drive motor 1531, a limit rod 1532, a lead screw 1533, a rotary motor 1534, a pulley 1535, a mounting base 1536, and a mounting plate 1537. The drive motor 1531 is mounted on the outer wall of the dust removal and dechlorination tank 1. The output end of the drive motor 1531 is connected to the lead screw 1533. The lead screw 1533 is rotatably mounted inside the dust removal and dechlorination tank 1. The mounting base 1536 is threaded onto the lead screw 1533. The mounting base 1536 is connected to the limit rod 1532. The limit rod 1532 is mounted on the inner wall of the dust removal and dechlorination tank 1. The rotary motor 1534 is mounted on the mounting base 1536. The output end of the rotary motor 1534 is connected to the mounting plate 1537 through the pulley 15. The mounting plate 1537 is rotatably mounted on the mounting base 1536. The mounting plate 1537 is connected to the housing 1521.

[0059] During operation, nitrogen is introduced into the nitrogen pipe 1523, allowing the nitrogen to enter the nitrogen nozzle 1523 along the nitrogen pipe 1523 and be sprayed out from the nitrogen nozzle 1523. Then, the drive motor 1531 is started, driving the lead screw 1533 to rotate, causing the mounting base 1536 to move along the dust removal and dechlorination tank 1, which in turn moves the nitrogen nozzle 1523. At this time, the nitrogen nozzle 1523 is set downwards, so as to backflush the dust removal and dechlorination layer.

[0060] Then, after the nitrogen purging of the cleaning component 152 is completed, the rotary motor 1534 is controlled to work, and the pulley 1535 rotates, causing the mounting plate 1537 to rotate 180°, so that the water pipe 1525 on the cleaning component 152 is set downward. When the dust removal and dechlorination unit is in the stopped state, clean water is input through the water pipe 1525, so that the clean water enters the water nozzle 1524 along the water pipe 1525 and sprays out from the water nozzle 1525. Then the drive motor 1531 is started to work, driving the lead screw 1533 to rotate, so that the mounting base 1536 moves along the dust removal and dechlorination tank 1, driving the water nozzle 1524 to move back, so as to clean the dust removal and dechlorination layer.

[0061] Therefore, the cleaning device 15 of the present invention can connect nitrogen dust removal and water dust removal together, reducing the space occupied in the dechlorination dust removal tank 1. In addition, the drive component 153 can control its movement, making the dust removal efficiency of the dechlorination layer higher and more comprehensive. Furthermore, the two dust removal modes can be switched, with unidirectional movement for nitrogen dust removal and return movement for water washing dust removal, thereby further improving the cleaning and dust removal efficiency.

[0062] The working principle of this invention: This invention uses a dust removal and dechlorination unit, a hydrolysis unit, and a desulfurization unit to sequentially perform dust removal, dechlorination, hydrolysis, and desulfurization purification treatment on coal gas. Through triple purification, the efficiency of coal gas desulfurization treatment will be greatly improved.

[0063] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A combined dust removal and desulfurization tower for coal gas, characterized in that, include: The dust removal and dechlorination unit includes a dechlorination and dust removal agent (14) installed in the dust removal and dechlorination tank (1); The hydrolysis unit includes a hydrolysate layer (21) disposed within the hydrolysis unit tank (2); The desulfurization unit includes a desulfurizing agent layer (31) disposed in the desulfurization unit tank (3); The dust removal and dechlorination tank (1), the hydrolysis unit tank (2), and the desulfurization unit tank (3) are connected in sequence through connecting pipes; A cleaning device (15) is provided on the dechlorination dust removal agent (14). The cleaning device (15) includes a cleaning component (152). The horizontal parts of the nitrogen pipe (1523) and the water pipe (1525) of the cleaning component (152) are located inside the housing (1521). The nitrogen pipe (1523) is connected to the nitrogen nozzle (1522), and the water pipe (1525) is connected to the water nozzle (1524). The drive unit (153) controls the sweeping unit (152) to move back and forth; Nitrogen pipe (1523) and clean water pipe (1525) penetrate the side wall of dust removal and dechlorination tank (1); The driving component (153) includes a drive motor (1531), which is installed on the outer wall of the dust removal and dechlorination tank (1). The output end of the drive motor (1531) is connected to the lead screw (1533), which is rotatably installed inside the dust removal and dechlorination tank (1). A mounting seat (1536) is threaded on the lead screw (1533), which is connected to the limiting rod (1532). The limiting rod (1532) is installed on the inner wall of the dust removal and dechlorination tank (1). A rotary motor (1534) is installed on the mounting seat (1536), and the output end of the rotary motor (1534) is connected to the mounting plate (1537) through the pulley (15). The mounting plate (1537) is rotatably installed on the mounting seat (1536), and the mounting plate (1537) is connected to the housing (1521). During operation, the nitrogen nozzle (1523) is set downwards to backflush the dust removal and dechlorination layer. After the nitrogen purging of the cleaning component (152) is completed, the rotary motor (1534) is controlled to work, and the pulley 1535 rotates to rotate the mounting plate (1537) by 180°, so that the water pipe (1525) on the cleaning component (152) is set downwards. When the dust removal and dechlorination unit is in a stopped state, clean water is input through the water pipe (1525), so that the clean water enters the water nozzle (1524) along the water pipe (1525) and sprays out from the water nozzle (1524).

2. The integrated coal gas desulfurization tower with combined dust removal as described in claim 1, characterized in that, An air inlet pipe (11) is provided at the bottom inlet of the dust removal and dechlorination tank (1), a first valve (12) is provided on the air inlet pipe (11), and a dust meter (13) is provided on the air inlet pipe (11).

3. The integrated coal gas desulfurization tower with combined dust removal as described in claim 1, characterized in that, The inner cavity of the hydrolysis unit tank (2) is also equipped with a baffle (22).

4. The integrated coal gas desulfurization tower with combined dust removal as described in claim 3, characterized in that, The hydrolysant layer (21) is horizontally arranged, and the partition (22) is vertically arranged.

5. The integrated coal gas desulfurization tower with combined dust removal as described in claim 1, characterized in that, The connecting pipe includes: The top outlet of the dust removal and dechlorination tank (1) is connected to the top inlet of the hydrolysis unit tank (2) through the first connecting pipe (4). The two ends of the first connecting pipe (4) are respectively equipped with a third valve (41) and a fourth valve (42). The top outlet of the hydrolysis unit tank (2) is connected to the top inlet of the desulfurization unit tank (3) through the second connecting pipe (5). The two ends of the second connecting pipe (5) are respectively equipped with a fifth valve (51) and a sixth valve (52).

6. A combined dust removal and desulfurization tower for coal gas as described in claim 5, characterized in that, The third valve (41) is located inside the dust removal and dechlorination tank (1), and the fourth valve (42) is located inside the hydrolysis unit tank (2).

7. A combined dust removal and desulfurization tower for coal gas as described in claim 6, characterized in that, The fifth valve (51) is located inside the hydrolysis unit tank (2), and the sixth valve (52) is located inside the desulfurization unit tank (3).

8. A combined dust removal and desulfurization tower for coal gas as described in claim 1, characterized in that, The bottom of the dust removal and dechlorination tank (1), the hydrolysis unit tank (2) and the desulfurization unit tank (3) are all equipped with ash discharge valves (7).

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