Treatment device for tar residue in ammonia water

Abstract

The invention discloses a device for treating tar residue in ammonia water, which comprises a pre-separator, a separation tank, a press pump, a delivery pump and a super centrifuge, a raw material inlet of the pre-separator is connected with a gas-liquid separator, and a tar ammonia water outlet is connected with a feed inlet of the separation tank through a tar residue filter screen; a feed port of the squeezing pump is connected with a bottom outlet of the pre-separator, and a discharge port of the squeezing pump is connected with a top inlet of the pre-separator; an ammonia water outlet of the separation tank is connected with a coke oven raw gas cooling device through an ammonia water circulating pump, and a tar residue outlet is connected with a feeding hole of the super centrifuge through a conveying pump; a tar outlet of the super centrifuge is connected with a tar intermediate tank, an ammonia water outlet is connected with a waste liquid tank, a tar residue outlet is connected with a tar residue buffer tank, and the tar residue buffer tank is connected with a coal tower through a hydraulic plunger pump. The floor is of a closed structure, leakage of tar, water and harmful peculiar smell gas can be prevented, environmental pollution is eliminated, the floor cleaning workload is reduced, and the body health of workers is guaranteed.

Description

Technical Field

[0001] The invention relates to a device for treating tar residue in ammonia water, which can reduce environmental pollution and belongs to the technical field of inorganic chemistry. Background Art

[0002] At present, the separation of tar and ammonia water generally adopts the mechanical scraper tank process. The tar and ammonia water from the gas-liquid separator first passes through the mechanical scraper tank, where most of the tar residue and tar and ammonia water are separated. The tar residue is transported to the coal yard for mixed coking through the tar residue trolley of the automatic slag discharge device. The tar and ammonia water are then transported to the separation tank, where the tar and ammonia water are separated. The ammonia water returns to the coke oven to cool the raw coal gas. The tar residue at the bottom of the tank is sent back to the mechanical scraper tank by a tar pump to further separate the tar residue.

[0003] The tar residue separated by the mechanical scraper trough has high oil and water content, which causes more oil and water on the floor at the outlet of the mechanical scraper trough, causing serious floor pollution and increasing the workload of floor cleaning. The outlet of the mechanical scraper trough is open, causing harmful odorous gas to spread and causing serious environmental pollution. Therefore, it is very necessary to design a tar ammonia water separation device with low pollution. Summary of the invention

[0004] The purpose of the present invention is to provide a treatment device for tar residue in ammonia water in view of the drawbacks of the prior art, so as to eliminate environmental pollution, reduce the workload of floor cleaning, and ensure the health of employees.

[0005] To achieve the above object, the present invention adopts the following technical solution: A device for treating tar residue in ammonia water comprises a pre-separator, a separation tank, a squeezing pump, a delivery pump and a super centrifuge, wherein a raw material inlet on the side wall of the pre-separator is connected to a tar-ammonia water mixture outlet of a gas-liquid separator, and the tar-ammonia water outlet is connected to a feed port of the separation tank through a tar residue filter; the feed port of the squeezing pump is connected to a bottom outlet of the pre-separator, and the discharge port is connected to a top inlet of the pre-separator; the ammonia water outlet of the separation tank is connected to a coke oven raw gas cooling device through an ammonia water circulation pump, and the tar residue outlet is connected to a feed port of a super centrifuge through a delivery pump; the tar outlet of the super centrifuge is connected to a tar intermediate tank, the ammonia water outlet is connected to a waste liquid tank, the tar residue outlet is connected to a tar residue buffer tank, and the tar residue buffer tank is connected to a distributor in a coal tower through a hydraulic plunger pump.

[0006] The above-mentioned tar residue treatment device in ammonia water also includes a tar residue circulation pump, the liquid inlet of the tar residue circulation pump is connected to the tar residue outlet at the bottom of the separation tank, and the liquid outlet is connected to the feed port on the upper part of the side wall of the separation tank.

[0007] In the above-mentioned device for treating tar residue in ammonia water, a three-way valve is provided between the delivery pump and the super centrifuge, the inlet of the three-way valve is connected to the liquid outlet of the delivery pump, the first outlet of the three-way valve is connected to the feed port of the super centrifuge, and the second outlet is connected to the top inlet of the pre-separator through the fifth valve.

[0008] In the above-mentioned device for treating tar residue in ammonia water, a third valve and a fourth valve are installed on the inlet pipe of the three-way valve.

[0009] In the above-mentioned device for treating tar residue in ammonia water, two of the delivery pump, the separation tank and the ammonia water circulation pump are provided, and the two delivery pumps, the two separation tanks and the two ammonia water circulation pumps are used in parallel.

[0010] In the above-mentioned device for treating tar residue in ammonia water, two tar residue circulation pumps are provided and the two tar residue circulation pumps are used in parallel.

[0011] The above-mentioned device for treating tar residue in ammonia water also includes a first valve and a second valve, which are respectively installed at the liquid outlets of the two delivery pumps.

[0012] In the above-mentioned device for treating tar residue in ammonia water, the tar residue buffer tank is a cone-bottom tank, a level meter is arranged in the tar residue buffer tank, and a signal output end of the level meter is connected to a controller of a hydraulic plunger pump.

[0013] In the above-mentioned device for treating tar residue in ammonia water, the super centrifuge is a horizontal centrifuge.

[0014] In the above-mentioned device for treating tar residue in ammonia water, the mesh size of the tar residue filter is 5 mm.

[0015] The pre-separator, separation tank, squeezing pump, delivery pump and super centrifuge and other equipment of the present invention are all closed structures, which can effectively prevent the leakage of tar, water and harmful odorous gases, eliminate environmental pollution, reduce the workload of floor cleaning, and ensure the health of employees. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] The numbers in the figure are as follows: 1. pre-separator, 2. first separation tank, 3. second separation tank, 4. pressing pump, 5. first tar residue circulation pump, 6. second tar residue circulation pump, 7. super centrifuge, 8. tar residue buffer tank, 9. waste liquid tank, 10. tar intermediate tank, 11. hydraulic plunger pump, 12. first delivery pump, 13. second delivery pump, 14. first ammonia circulation pump, 15. second ammonia circulation pump, 16. tar residue filter, 17. first valve, 18. second valve, 19. three-way valve, 20. third valve, 21. fourth valve, 22. fifth valve. DETAILED DESCRIPTION

[0019] In view of the problems existing in the prior art, the present invention provides a device for treating tar residue in ammonia water, which separates the tar residue in ammonia water in a fully closed system, prevents oil and water from polluting the floor, avoids harmful odorous gases from spreading in the workshop, and thus eliminates environmental pollution.

[0020] See also Figure 1 The present invention mainly includes a pre-separator 1, two separation tanks (a first separation tank 2 and a second separation tank 3), a squeezing pump 4, two tar residue circulation pumps (a first tar residue circulation pump 5 and a second tar residue circulation pump 6), a super centrifuge 7, a tar residue buffer tank 8, a waste liquid tank 9, a tar intermediate tank 10, a hydraulic plunger pump 11, two delivery pumps (a first delivery pump 12 and a second delivery pump 13), two ammonia water circulation pumps (a first ammonia water circulation pump 14 and a second ammonia water circulation pump 15), a tar residue filter 16, a first valve 17, a second valve 18, a three-way valve 19, a third valve 20, a fourth valve 21 and a fifth valve 22.

[0021] The tar-ammonia-water mixture from the gas-liquid separator enters the pre-separator 1 through the raw material inlet on the upper part of the side wall of the pre-separator 1, and the tar-ammonia-water outlet on the upper part of the side wall of the pre-separator 1 is connected to the feed inlet on the upper part of the side wall of the first separation tank 2 and the second separation tank 3; the feed inlet of the squeezing pump 4 is connected to the bottom outlet of the pre-separator 1, and the discharge port is connected to the top inlet of the pre-separator 1; a tar residue filter 16 with a mesh size of 5 mm is provided on the inner side of the tar-ammonia-water outlet of the pre-separator 1, and the tar residue with a diameter less than 5 mm passes through the tar residue filter 16 and enters the first separation tank 2 and the second separation tank 3 together with the tar-ammonia-water, and the tar residue with a diameter greater than 5 mm enters the squeezing pump 4 from the bottom outlet of the pre-separator 1, and after being ground and crushed in the squeezing pump 4, it enters the pre-separator 1 again for cyclic squeezing, thereby realizing the closed operation of this link.

[0022] In the first separation tank 2 and the second separation tank 3, tar, tar residue and ammonia water are separated into three phases, the liquid inlet of the first ammonia water circulation pump 14 and the second ammonia water circulation pump 15 are connected to the ammonia water outlet of the first separation tank 2 and the second separation tank 3, and the liquid outlet is connected to the coke oven raw gas cooling device through a pipeline; the liquid inlet of the first delivery pump 12 and the second delivery pump 13 are connected to the tar residue outlet at the bottom of the first separation tank 2 and the second separation tank 3, and the liquid outlets of the first delivery pump 12 and the second delivery pump 13 are connected to the inlet of the three-way valve 19 through the third valve 20 and the fourth valve 21 after merging, the first outlet of the three-way valve 19 is connected to the feed port of the super centrifuge 7, and the second outlet is connected to the top inlet of the pre-separator 1 through the fifth valve 22. The ammonia water in the first separation tank 2 and the second separation tank 3 is pumped back to the coke oven gas collecting pipe to cool the raw gas through the first ammonia water circulation pump 14 and the second ammonia water circulation pump 15, and the bottom tar residue is transported to the super centrifuge 7 through the first delivery pump 12 and the second delivery pump 13, and the tar remains in the first separation tank 2 and the second separation tank 3.

[0023] The first valve 17 and the second valve 18 are respectively installed at the liquid outlets of the first delivery pump 12 and the second delivery pump 13. The first valve 17 and the second valve 18 can be used to control the first delivery pump 12 and the second delivery pump 13 to work simultaneously or alternately.

[0024] The liquid inlets of the first tar residue circulation pump 5 and the second tar residue circulation pump 6 are connected to the tar residue outlets at the bottom of the first separation tank 2 and the second separation tank 3, and the liquid outlets are connected to the feed ports at the upper parts of the side walls of the first separation tank 2 and the second separation tank 3.

[0025] Tar residue contains tar and ammonia water, which are separated by the super centrifuge 7 to separate tar, ammonia water and tar residue. The tar outlet of the super centrifuge 7 is connected to the tar intermediate tank 10, the ammonia water outlet is connected to the waste liquid tank 9, the tar residue outlet is connected to the tar residue buffer tank 8, the inlet of the hydraulic plunger pump 11 is connected to the tar residue outlet at the bottom of the tar residue buffer tank 8, and the outlet of the hydraulic plunger pump 11 is connected to the distributor in the coal tower. The tar separated by the super centrifuge 7 is transported to the tar intermediate tank 10, the ammonia water is transported to the waste liquid tank 9, and finally transported to the pre-separator 1, and the tar residue is transported to the tar residue buffer tank 8 below the super centrifuge. The tar residue buffer tank 8 is a cone bottom tank. The tar residue in the tar residue buffer tank 8 is sent to the distributor in the coal tower by the hydraulic plunger pump 11 and enters the coal bunker.

[0026] The super centrifuge 7 is a horizontal centrifuge with a processing capacity of ≥12 t / h. A material level meter is arranged in the tar residue buffer tank 8, and the hydraulic plunger pump 11 is started when the high material level is reached.

[0027] The tar slag transportation pipeline is laid along the pipeline corridor within the factory area. It uses seamless steel pipe D159x11. Electric heating tape and insulation layer are installed on the outside of the pipeline to ensure that the pipe temperature is maintained above 50°C. Steam purge ports are set every 100m to achieve continuous and stable transportation of tar slag during winter production.

[0028] The operation method of the present invention: Step 1: Crush the existing tar residue in the system.

[0029] 1. Check the pre-separator 1 1) Clear the internal debris; 2) Open the outlet valve of the tar-ammonia mixture and close the inlet valve; 2. Turn on the squeeze pump 4 1) Preparation before startup: a. Check all bolts of the equipment for looseness before operation. Make sure all bolts are tightened.

[0030] b. Check the switch status of each valve on the pipeline to ensure that the inlet and outlet pipeline valves are in the closed state.

[0031] c. Adjust the nitrogen pressure of the sealing tank to 5bra, the ammonia pressure to 4bra, and turn on the cooling water.

[0032] d. Remove the coupling protection cover, align the shaft and crank the machine, 5 turns forward and reverse. When cranking, pay attention to whether there is any jamming. If there is any jamming, the machine cannot be started. Contact the manufacturer's service engineer for processing. If the cranking is smooth, restore the coupling protection cover to its original position and prepare to start the machine.

[0033] 2) Start-up sequence of squeezing pump 4: a. Open the equipment outlet pipeline valve, and then test the equipment. If there is no problem with the motor rotation, start the equipment.

[0034] b. Open the inlet pipe valve and finally open the feed port. According to the solid content of the medium, open the ammonia flushing pipe valve appropriately.

[0035] 3. Switch the delivery pump line route.

[0036] Open the first valve 17 and the second valve 18, start the first delivery pump 12 and the second delivery pump 13, open the third valve 20 and the fourth valve 21, and switch the three-way valve 19 to the inlet direction of the super centrifuge 7 (in normal production, the three-way valve 19 delivers the tar slag delivered by the first delivery pump 12 and the second delivery pump 13 to the inlet of the super centrifuge 7 to achieve normal slag discharge operation; when problems occur in the super centrifuge 7, the hydraulic plunger pump 11 and the pipeline, open the fifth valve 22 and the three-way valve 19 to deliver the tar slag delivered by the first delivery pump 12 and the second delivery pump 13 to the pre-separator 1), and open normally.

[0037] Step 2: Start the first ammonia water circulation pump 14 , the second ammonia water circulation pump 15 , the super centrifuge 7 , and the hydraulic plunger pump 11 .

[0038] 1. Open the inlet valve of pre-separator 1.

[0039] 2. Start the first tar residue circulation pump 5 and the second tar residue circulation pump 6.

[0040] 3. Switch the three-way valve 19 to deliver the tar residue output by the first delivery pump 12 and the second delivery pump 13 to the pre-separator 1.

[0041] 4. Turn on the supercentrifuge 7.

[0042] 5. Switch the three-way valve 19 to deliver the tar residue output by the first delivery pump 12 and the second delivery pump 13 to the super centrifuge 7.

[0043] 6. Start the hydraulic piston pump 11.

[0044] 1) Check before starting a. Check whether all fastening bolts are loose. Pay special attention to the tightening of the bolts of all driving parts such as hydraulic motors, reducers, and cylinders to meet the specified torque.

[0045] b. Check whether all safety facilities are in place.

[0046] c. Check that the connection between the feed hopper and the pump feed port is well sealed, and that the outlet pipe is well sealed.

[0047] d. Before starting the hydraulic station, check whether the hydraulic pump suction valve is open. If it is not open, it is strictly forbidden to start the hydraulic station.

[0048] 2) Start a. The power supply circuit of the electric control cabinet must be supplied by the power distribution station with a voltage of 3x380V. The machine can be started only after power supply; b. Close the emergency stop circuit; c. The hydraulic piston pump circulates automatically.

[0049] An embodiment of the present invention is as follows:

[0050] The present invention can effectively implement full sealing measures in the production process, prevent the emission of polluting gases, and meet the environmental protection requirements stipulated by the state; the present invention directly transports the tar residue to the coke oven, thereby realizing the environmentally friendly recycling of waste particulate matter.

Claims

1. A device for treating tar residue in ammonia water, characterized in that: The invention comprises a pre-separator (1), a separation tank, a squeezing pump (4), a delivery pump and a super centrifuge (7); the raw material inlet on the side wall of the pre-separator (1) is connected to the tar-ammonia mixture outlet of the gas-liquid separator, and the tar-ammonia outlet is connected to the feed port of the separation tank through a tar residue filter (16); the feed port of the squeezing pump (4) is connected to the bottom outlet of the pre-separator (1), and the discharge port is connected to the top inlet of the pre-separator (1); the ammonia outlet of the separation tank is connected to the coke oven raw gas cooling device through an ammonia circulation pump, and the tar residue outlet is connected to the feed port of the super centrifuge (7) through a delivery pump; the tar outlet of the super centrifuge (7) is connected to the tar intermediate tank (10), the ammonia outlet is connected to the waste liquid tank (9), and the tar residue outlet is connected to the tar residue buffer tank (8); the tar residue buffer tank (8) is connected to the distributor in the coal tower through a hydraulic piston pump (11).

2. The device for treating tar residue in ammonia water according to claim 1, characterized in that: It also includes a tar residue circulation pump, the liquid inlet of the tar residue circulation pump is connected to the tar residue outlet at the bottom of the separation tank, and the liquid outlet is connected to the feed port on the upper part of the side wall of the separation tank.

3. A device for treating tar residue in ammonia water according to claim 1 or 2, characterized in that: A three-way valve (19) is provided between the delivery pump and the super centrifuge (7), the inlet of the three-way valve (19) being connected to the liquid outlet of the delivery pump, the first outlet of the three-way valve (19) being connected to the feed inlet of the super centrifuge (7), and the second outlet being connected to the top inlet of the pre-separator (1) via a fifth valve (22).

4. The device for treating tar residue in ammonia water according to claim 3, characterized in that: A third valve (20) and a fourth valve (21) are installed on the inlet pipe of the three-way valve (19).

5. The device for treating tar residue in ammonia water according to claim 4, characterized in that: The delivery pump, separation tank and ammonia water circulation pump are all provided with two, and the two delivery pumps, two separation tanks and two ammonia water circulation pumps are used in parallel.

6. The device for treating tar residue in ammonia water according to claim 2, characterized in that: Two tar residue circulation pumps are provided, and the two tar residue circulation pumps are used in parallel.

7. The device for treating tar residue in ammonia water according to claim 5, characterized in that: It also includes a first valve (17) and a second valve (18), which are respectively installed at the liquid outlets of the two delivery pumps.

8. The device for treating tar residue in ammonia water according to claim 7, characterized in that: The tar residue buffer tank (8) is a conical bottom tank. A material level meter is provided in the tar residue buffer tank (8). The signal output end of the material level meter is connected to the controller of the hydraulic plunger pump (11).

9. The device for treating tar residue in ammonia water according to claim 8, characterized in that: The super centrifuge (7) is a horizontal centrifuge.

10. The device for treating tar residue in ammonia water according to claim 9, characterized in that: The mesh size of the tar residue filter (16) is 5 mm.

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