Gas-water separation system

Abstract

The invention relates to a gas-water separation system. Atmospheric storage tanks in an atmospheric storage tank group and separators in a separator group are communicated with the air inlet end of an expiratory gas main pipe through expiratory gas branch pipes, the air outlet end of the expiratory gas main pipe is connected with the air inlet end of a respiratory gas liquid separation tank, the air outlet end of the respiratory gas liquid separation tank is connected with an air blower, and an air outlet of the air blower is connected with an RTO device; and a nitrogen self-operated regulating valve and a breather valve are arranged on the exhalation main pipe. VOCs generated by the normal-pressure tank group are received and stored through the breathing gas liquid separation tank and conveyed outwards, the breathing gas liquid separation tank is used for adjusting and controlling the pressure of an expiration gas main pipe and the pressure of an expiration gas branch pipe, and then the pressure of the normal-pressure storage tank group and the pressure of the separator group are adjusted; each expiration branch pipe is not provided with a nitrogen self-operated regulating valve, so that the failure rate is reduced, and meanwhile, the nitrogen consumption of the system can be reduced; and each atmospheric storage tank and each separator are not provided with a breather valve, so that the risk of long-term leakage of the VOCs can be reduced while the failure rate is reduced, and safety accidents caused by long-term inhalation of air mixed with the VOCs by operators are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of pulverized coal pressurized gasification, and particularly relates to a gas-water separation system. Background Art

[0002] In existing gas-water separation systems (such as Figure 2 ), the breathing valves on medium-pressure and atmospheric storage tanks and separators are prone to crystallization blockage, leakage, etc. They cannot replenish or release pressure in a timely manner after the equipment pressure fluctuates to negative pressure or overpressure, resulting in equipment damage; at the same time, long-term air leakage from the breathing valves will cause environmental pollution and a strong odor.

[0003] In existing gas-water separation systems, the pressure control of medium-pressure and atmospheric storage tanks is unstable. There is a risk of combustion and explosion when negative pressure sucks in air and mixes it with the combustible gas in the tank; the nitrogen self-operated regulating valves installed on the medium-pressure and atmospheric storage tanks and separators have a high failure rate and a long maintenance cycle. When manually replenishing pressure on-site after the nitrogen self-operated regulating valve fails, the nitrogen consumption is large and the operation intensity is high. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas-water separation system to solve the above problems existing in the prior art.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: A gas-water separation system includes an atmospheric storage tank group, a separator group, a nitrogen self-operated regulating valve, a breathing valve, a breathing gas liquid separation tank, a blower, an exhaled gas main pipe, and an exhaled gas branch pipe. Each atmospheric storage tank in the atmospheric storage tank group and each separator in the separator group are connected to the intake end of the exhaled gas main pipe through the exhaled gas branch pipe. The outlet end of the exhaled gas main pipe is connected to the intake end of the breathing gas liquid separation tank. The outlet end of the breathing gas liquid separation tank is connected to the blower, and the outlet of the blower is connected to an RTO (Regenerative Thermal Oxidizer) device; a nitrogen self-operated regulating valve and a breathing valve are provided on the exhaled gas main pipe.

[0006] The beneficial effects of the present invention are as follows: The breathing gas liquid separation tank is used to receive and store VOCs (volatile organic compounds) generated by the atmospheric tank group and transport them externally. The breathing gas liquid separation tank is used to adjust and control the pressure of the exhaled gas main pipe and the exhaled gas branch pipe, and then adjust the pressure of the atmospheric storage tank group and the separator group; nitrogen self-operated regulating valves are not provided on each exhaled gas branch pipe, which can reduce the failure rate and the nitrogen consumption of the system; breathing valves are not provided on each atmospheric storage tank and each separator, which can reduce the failure rate and the risk of long-term leakage of VOCs, and avoid safety accidents caused by operators inhaling air mixed with VOCs for a long time.

[0007] Based on the above technical solutions, the present invention can also be improved as follows.

[0008] Furthermore, the atmospheric storage tank group includes a flushing water tank, a slurry tank, a polyhydrocarbon tank, a heavy aromatic hydrocarbon tank, a gas-water tank, a first buffer tank, and a second buffer tank; the separator group includes a first primary tar separator, a second primary tar separator, a first oil separator, a second oil separator, a first final oil separator, and a second final oil separator.

[0009] The beneficial effects of the above are as follows: The flushing water tank can provide backwash water for the dual-media filter; the slurry tank can store the sewage after backwashing of the dual-media filter and send it back to the separation system; the polyhydrocarbon tank can collect and statically store the by-product polyhydrocarbon oil of the system; the heavy aromatic hydrocarbon tank can collect and statically store the by-product heavy aromatic hydrocarbon oil of the system; the gas-water tank can store the product gas-water after oil-water separation and provide raw material phenolic water to the phenol recovery unit; the first buffer tank and the second buffer tank can temporarily store the gas-water after oil-water separation and provide washing gas-water to other equipment; the first primary tar separator and the second primary tar separator can separate the heavy aromatic hydrocarbons in the gas-water by gravity sedimentation; the first oil separator and the second oil separator can separate the polyhydrocarbons in the gas-water by gravity sedimentation; the first final oil separator and the second final oil separator can separate the polyhydrocarbons in the gas-water by coke filtration.

[0010] Furthermore, another series of breathing gas pipelines are connected in parallel to the main exhaled gas pipeline, and breathing gas boundary valves are provided upstream of the node between the main exhaled gas pipeline and the other series of breathing gas pipelines and on the other breathing gas pipeline.

[0011] The beneficial effect of the above is as follows: The breathing gas boundary valve is a single-series breathing gas external delivery boundary valve and can be separated from the external system as needed. Description of the Drawings

[0012] Figure 1 For the present invention Figure 1 is a schematic diagram of a gas-water separation system of the present invention; Figure 2 is a prior art figure.

[0013] In the drawings, the list of components represented by each reference numeral is as follows: 1. Nitrogen self-operated regulating valve; 2. Exhalation valve; 3. Breather valve; 4. Flushing water tank; 5. Mud liquid tank; 6. Polyhydrocarbon tank; 7. Heavy aromatic hydrocarbon tank; 8. Gas-water tank; 9. Second buffer tank; 10. First buffer tank; 11. First final oil separator; 12. First primary tar separator; 13. Second final oil separator; 14. Second primary tar separator; 15. First oil separator; 16. Second oil separator; 17. Breather gas boundary area valve; 18. Pressure gauge at the inlet of the breather gas liquid separation tank; 19. Breather gas liquid separation tank; 20. Level regulating valve of the breather gas liquid separation tank; 21. Level gauge of the breather gas liquid separation tank; 22. Blower; 23. Return regulating valve of the breather gas blower; 24. Pressure gauge of the breather gas going to RTO; 25. On-line oxygen content meter of the breather gas going to RTO; 26. Cut-off valve of the breather gas going to RTO; 27. Breather gas vent valve; 28. Flame arrester; 29. Exhaled gas branch pipe; 30. Exhaled gas main pipe. Detailed implementation mode

[0014] The principles and features of the present invention will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0015] Example 1 As Figure 1 shown, a gas-water separation system includes an atmospheric storage tank group, a separator group, a nitrogen self-operated regulating valve 1, a breather valve 3, a breather gas liquid separation tank 19, a blower 22, an exhaled gas main pipe 30 and an exhaled gas branch pipe 29. Each atmospheric storage tank in the atmospheric storage tank group and each separator in the separator group are connected to the inlet end of the exhaled gas main pipe 30 through the exhaled gas branch pipe 29. The outlet end of the exhaled gas main pipe 30 is connected to the intake pipe of the breather gas liquid separation tank 19. The outlet pipe of the breather gas liquid separation tank 19 is connected to the blower 22, and the outlet of the blower 22 is connected to the RTO device; a nitrogen self-operated regulating valve 1 and a breather valve 3 are provided on the exhaled gas main pipe 30.

[0016] The breather gas liquid separation tank 19 is used to receive and store the VOCs generated by the atmospheric tank group and transport them externally. The breather gas liquid separation tank 19 is used to regulate and control the pressures of the exhaled gas main pipe 30 and the exhaled gas branch pipe 29, and then adjust the pressures of the atmospheric storage tank group and the separator group; no nitrogen self-operated regulating valve 1 is provided on each exhaled gas branch pipe 29, which can reduce the failure rate and the nitrogen consumption of the system at the same time; no breather valve 3 is provided on each atmospheric storage tank and each separator, which can reduce the failure rate and the risk of long-term leakage of VOCs at the same time, and avoid safety accidents caused by operators inhaling air mixed with VOCs for a long time. Specifically, when implemented, the breather gas liquid separation tank 19 regulates and controls the pressures of the exhaled gas main pipe 30 and the exhaled gas branch pipe 29 to be 0.5 - 2.0 kPa; the blower 22 is a variable frequency blower, which is energy-saving and efficient.

[0017] Example 2 As Figure 1As shown in the figure, this embodiment is a further improvement on Embodiment 1, and the specific details are as follows: The atmospheric storage tank group includes a flushing water tank 4, a slurry tank 5, a polyhydrocarbon tank 6, a heavy aromatic hydrocarbon tank 7, a gas-water tank 8, a first buffer tank 10 and a second buffer tank 9; the separator group includes a first primary tar separator 12, a second primary tar separator 14, a first oil separator 15, a second oil separator 16, a first final oil separator 11 and a second final oil separator 13. The flushing water tank 4 can provide backwashing water for the dual-media filter; the slurry tank 5 can store the sewage after backwashing of the dual-media filter and send it back to the separation system; the polyhydrocarbon tank 6 can collect and statically store the by-product oil polyhydrocarbon of the system; the heavy aromatic hydrocarbon tank 7 can collect and statically store the by-product oil heavy aromatic hydrocarbon of the system; the gas-water tank 8 can store the product gas-water after oil-water separation and provide raw phenolic water to the phenol recovery device; the first buffer tank 10 and the second buffer tank 9 can temporarily store the gas-water after oil-water separation and provide washing gas-water to other equipment; the first primary tar separator 12 and the second primary tar separator 14 can separate the heavy aromatic hydrocarbons in the gas-water by gravity sedimentation; the first oil separator 15 and the second oil separator 16 can separate the polyhydrocarbons in the gas-water by gravity sedimentation; the first final oil separator 11 and the second final oil separator 13 can separate the polyhydrocarbons in the gas-water by coke filtration.

[0018] Embodiment 3 As Figure 1 shown in the figure, this embodiment is a further improvement on Embodiment 2, and the specific details are as follows: Multiple groups are provided for the first buffer tank 10, the second buffer tank 9, the first primary tar separator 12, the second primary tar separator 14, the first oil separator 15, the second oil separator 16, the first final oil separator 11 and the second final oil separator 13. Specifically in implementation, two groups are set, which can save economic expenses while ensuring the processing efficiency.

[0019] The outlet end of the flushing water tank 4 is connected to the outlet end of the slurry tank 5, and after passing through the exhalation valve 2, it is connected to the exhaled gas branch pipe 29; the outlet ends of the remaining atmospheric storage tanks and separators are directly connected to the exhaled gas branch pipe 29 after passing through the exhalation valve 2. When the VOCs pressure inside each atmospheric storage tank and separator is greater than 2.0 kPa, it is collected into the exhaled gas main pipe 30 through the exhalation valve 2 to ensure that the pressure of a single device does not exceed the limit.

[0020] Embodiment 4 As Figure 1 shown in the figure, this embodiment is a further improvement on Embodiment 3, and the specific details are as follows: Another series of breathing gas pipelines is connected in parallel to the main expiratory gas pipeline 30. A breathing gas boundary valve 17 is provided upstream of the node where the main expiratory gas pipeline 30 is connected to the other series of breathing gas pipelines and on the other breathing gas pipeline. The breathing gas boundary valve 17 is a single-series breathing gas external delivery boundary valve and can be separated from the external system as needed.

[0021] A venting module is connected in parallel to the outlet end of the main expiratory gas pipeline 30, and a venting module is also connected in parallel to the pipeline between the blower 22 and the RTO device. The venting module includes a breathing gas vent valve 27 and a flame arrester 28 connected in series along the outlet direction. When the breathing gas liquid separation tank 19 is under maintenance or fails, the breathing gas boundary valve 17 of this series is closed, and the breathing gas vent valve 27 on the main expiratory gas pipeline 30 is opened, and the waste gas is discharged externally for a short time; the flame arrester 28 can prevent the occurrence of combustion during the venting of breathing gas.

[0022] Embodiment 5 As Figure 1 shown, this embodiment is a further improvement on Embodiment 4, specifically as follows: A bypass is provided at the outlet end of the blower 22 to conduct with the inlet end of the breathing gas liquid separation tank 19, and a breathing gas blower return regulating valve 23 is provided on the bypass. The return flow of the blower 22 can be adjusted according to the inlet pressure of the breathing gas liquid separation tank 19 to prevent the tank group and the breathing gas liquid separation tank 19 from forming a negative pressure and realize the stable pressure regulation of the tank group.

[0023] Multiple blowers 22 are connected in parallel; a drainage pipeline is provided at the bottom of the breathing gas liquid separation tank 19, and a breathing gas liquid separation tank liquid level regulating valve 20 is provided on the drainage pipeline; multiple nitrogen self-operated regulating valves 1 are connected in parallel. The breathing gas liquid separation tank 19 naturally cools and separates gas and liquid from the breathing gas of two adjacent series from the coal gas water separation system. The breathing gas is pressurized by the blower 22 from the top and sent to the RTO device, and the condensate at the bottom is recovered to the coal gas water separation tar sewage tank system; when one nitrogen self-operated regulating valve 1 fails, the other nitrogen self-operated regulating valves 1 can play a role in supplementing nitrogen to avoid equipment negative pressure and sucking in air.

[0024] Embodiment 6 As Figure 1 shown, this embodiment is a further improvement on Embodiment 5, specifically as follows: A pressure gauge 18 for the inlet of the breathing gas separation tank is provided on the main exhaled gas pipe 30 at the inlet end of the breathing gas separation tank 19. The pressure gauge 18 for the inlet of the breathing gas separation tank is interlocked with the reflux regulating valve 23 of the breathing gas fan; a liquid level gauge 21 for the breathing gas separation tank is provided outside the breathing gas separation tank 19, and the liquid level gauge 121 for the breathing gas separation tank is interlocked with the liquid level regulating valve 20 of the breathing gas separation tank. The pressure gauge 18 for the inlet of the breathing gas separation tank can monitor the pressure of the coal gas water separation system in real time. When the pressure at the inlet end of the breathing gas separation tank 19 is too low (<0.5 kPa), the blower 22 is interlocked to boost the pressure to prevent the system and the breathing gas separation tank 19 from being in negative pressure; the liquid level gauge 21 for the breathing gas separation tank can monitor the liquid level of the breathing gas separation tank 19 in real time and control the liquid level within a reasonable range of 20-50% to avoid carrying out the breathing gas at the top of the breathing gas separation tank 19.

[0025] A pressure gauge 24 for breathing gas going to the RTO, an on-line oxygen content meter 25 for breathing gas going to the RTO and a cut-off valve 26 for breathing gas going to the RTO which are interlocked with each other are provided at the outlet end of the blower 22. The pressure gauge 24 for breathing gas going to the RTO monitors the pressure of the breathing gas sent to the RTO device in real time. When the pressure is too high (>15 kPa), the breathing gas vent valve 27 at the outlet end of the blower 22 is interlocked to open; the on-line oxygen content meter 25 for breathing gas going to the RTO can monitor the oxygen content of the breathing gas sent to the RTO device in real time. When the oxygen content >0.5%, the cut-off valve 26 for breathing gas going to the RTO is interlocked to close, and the breathing gas vent valve 27 at the outlet end of the blower 22 is opened.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A coal gas water separation system, characterized in that, It includes an atmospheric storage tank group, a separator group, a nitrogen self-operated regulating valve (1), a breather valve (3), a breathing gas liquid separation tank (19), a blower (22), an exhaled gas main pipe (30) and an exhaled gas branch pipe (29). Each atmospheric storage tank in the atmospheric storage tank group and each separator in the separator group are connected to the intake end of the exhaled gas main pipe (30) through the exhaled gas branch pipe (29). The outlet end of the exhaled gas main pipe (30) is connected to the intake end of the breathing gas liquid separation tank (19). The outlet end of the breathing gas liquid separation tank (19) is connected to the blower (22). The outlet of the blower (22) is connected to the RTO device. The nitrogen self-operated regulating valve (1) and the breather valve (3) are arranged on the exhaled gas main pipe (30).

2. The coal gas water separation system according to claim 1, characterized in that, The atmospheric storage tank group includes a flushing water tank (4), a slurry tank (5), a polyhydrocarbon tank (6), a heavy aromatic hydrocarbon tank (7), a gas-water tank (8), a first buffer tank (10) and a second buffer tank (9). The separator group includes a first primary tar separator (12), a second primary tar separator (14), a first oil separator (15), a second oil separator (16), a first final oil separator (11) and a second final oil separator (13).

3. The coal gas water separation system according to claim 2, characterized in that, Multiple sets are provided for the first buffer tank (10), the second buffer tank (9), the first primary tar separator (12), the second primary tar separator (14), the first oil separator (15), the second oil separator (16), the first final oil separator (11) and the second final oil separator (13).

4. The coal gas water separation system according to claim 1, characterized in that The outlet end of the flushing water tank (4) is connected to the outlet end of the slurry tank (5), and after passing through the exhalation valve (2), it is connected to the exhaled gas branch pipe (29). The outlet ends of the other atmospheric storage tanks and separators are directly connected to the exhaled gas branch pipe (29) after passing through the exhalation valve (2).

5. The gas-water separation system according to claim 1, wherein Another series of breathing gas pipelines is branched off from the exhaled gas main pipe (30). Breathing gas boundary valves (17) are arranged upstream of the node between the exhaled gas main pipe (30) and the other series of breathing gas pipelines and on the other breathing gas pipeline.

6. The coal gas water separation system according to claim 1, characterized in that A venting module is branched off from the outlet end of the exhaled gas main pipe (30), and a venting module is branched off from the pipeline between the blower (22) and the RTO device. The venting module includes a breathing gas vent valve (27) and a flame arrester (28) connected in series along the gas outlet direction.

7. The coal gas water separation system according to claim 1, wherein A bypass is provided at the outlet end of the blower (22) to conduct with the intake end of the breathing gas liquid separation tank (19), and a breathing gas blower reflux regulating valve (23) is arranged on the bypass.

8. The coal gas water separation system according to claim 7, characterized in that Multiple blowers (22) are connected in parallel. A drain pipeline is arranged at the bottom of the breathing gas liquid separation tank (19), and a breathing gas liquid separation tank liquid level regulating valve (20) is arranged on the drain pipeline. Multiple nitrogen self-operated regulating valves (1) are connected in parallel.

9. The coal gas water separation system according to claim 8, wherein A breathing gas separation tank inlet pressure gauge (18) is provided on the exhaled gas main pipe (30) at the inlet end of the breathing gas separation tank (19), and the breathing gas separation tank inlet pressure gauge (18) is interlocked with the breathing gas fan reflux regulating valve (23); a breathing gas separation tank liquid level gauge (21) is provided outside the breathing gas separation tank (19), and the breathing gas separation tank liquid level gauge (121) is interlocked with the breathing gas separation tank liquid level regulating valve (20); a breathing gas to RTO pressure gauge (24), a breathing gas to RTO on-line oxygen content meter (25) and a breathing gas to RTO cut-off valve (26) which are interlocked with each other are provided at the outlet end of the blower (22).

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