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CN-224226735-U - Semi-coke wastewater pretreatment greasy dirt recovery device

CN224226735UCN 224226735 UCN224226735 UCN 224226735UCN-224226735-U

Abstract

The utility model discloses a semi-coke wastewater pretreatment oil stain recovery device which comprises a raw material water sedimentation tank, a light oil receiving port, a first isolation hand valve, an electric two-position valve, an oil receiving pipeline, a first oil receiving main pipe, a pipeline viewing mirror, a second isolation hand valve, a remote transmission interface meter, a third isolation hand valve, a light oil collecting tank, a discharge pipeline, a nitrogen purging valve, a discharge shower valve, an inner tank light oil removal pipeline, a semi-coke wastewater inlet pipeline, a semi-coke wastewater outlet, a sewage tank, a sewage drain ground pipe, a remote transmission liquid level meter, a nitrogen purging pipeline, an oil removal main pipe, a second oil receiving main pipe and DCS. The outer tank is provided with a plurality of light oil receiving ports, the light oil receiving ports with different heights are selected for receiving oil according to the liquid level of the outer tank, and the light oil on the water surface is discharged through the oil receiving pipeline, the first oil receiving main pipe and the second oil receiving main pipe according to the liquid level of the outer tank and the thickness of an oil layer, so that the oil content of the semi-coke wastewater of the dephenolized ammonia recovery device is ensured to be qualified.

Inventors

  • WANG ZHUXIANG
  • Dang Xiyang
  • WANG DONG
  • HU BING
  • LI MINGMING

Assignees

  • 天津市创举科技股份有限公司

Dates

Publication Date
20260512
Application Date
20250508

Claims (10)

  1. 1. The device is characterized by comprising a raw material water sedimentation tank, a light oil receiving port (3), a first isolation hand valve (4), an electric two-position valve (5), an oil receiving pipeline (6), a first oil receiving main pipe (7), a pipeline view mirror (8), a second isolation hand valve (9), a remote transmission interface meter (10), a third isolation hand valve (11), a light oil collecting tank (12), a discharge pipeline (13), a nitrogen purging valve (14), a discharge shower guiding valve (15), an inner tank light oil removing pipeline (16), a semi-coke wastewater inlet pipeline (17), a semi-coke wastewater outlet (18), a sewage tank (19), a sewage draining ground pipe (20), a remote transmission liquid level meter (21), a nitrogen purging pipeline (22), a deoiling main pipe (23), a second oil receiving main pipe (24) and DCS; The raw material water sedimentation tank consists of an outer tank (1) and an inner tank (2), wherein oil removing equipment is arranged in the inner tank (2), the tail end of a semi-coke wastewater inlet pipeline (17) is positioned in the oil removing equipment, a DCS (distributed control system) is arranged in a central control room and is respectively in communication connection with an electric two-position valve (5), a remote transmission interface meter (10) and a remote transmission liquid level meter (21), the tank body of the outer tank (1) is provided with the remote transmission liquid level meter (21) for a remote operator to observe the liquid level height of the outer tank (1) on the DCS, and the lower part of the tank body of the outer tank (1) is provided with a semi-coke wastewater outlet (18); A plurality of light oil receiving ports (3) are formed in the tank body of the outer tank (1) along the vertical height direction, a remote transmission interface meter (10) is arranged at each light oil receiving port (3) and used for a remote operator to observe the thickness of a light oil layer on the water surface in the outer tank (1) on a DCS, each light oil receiving port (3) is communicated with the starting end of one oil receiving pipeline (6), the tail ends of all the oil receiving pipelines (6) are converged on a first oil receiving main pipe (7), the first oil receiving main pipe (7) is arranged beside the outer tank (1) from top to bottom, and a first isolation hand valve (4) and an electric two-position valve (5) are arranged on the horizontal pipeline of each oil receiving pipeline (6); The start end of the first oil collecting main pipe (7) is communicated with the tail end of a nitrogen purging pipeline (22), the nitrogen purging pipeline (22) is provided with a nitrogen purging valve (14), the tail end of the first oil collecting main pipe (7) is communicated with the start end of a second oil collecting main pipe (24), a pipeline sight glass (8) and a second isolation hand valve (9) are sequentially arranged on the second oil collecting main pipe (24) according to the flowing direction of liquid, an on-site operator monitors the purity of light oil in the second oil collecting main pipe (24) more intuitively from the pipeline sight glass (8), and the second isolation hand valve (9) is timely opened and closed manually or the quality of the oil collecting is controlled by remote control of an electric two-position valve (5) through a DCS; The drainage pipeline (13) is provided with a drainage shower guide valve (15), the starting end of the drainage shower guide valve is communicated with the middle lower part of a second oil collecting main pipe (24), a connecting point is located between a pipeline viewing mirror (8) and a second isolation hand valve (9), the tail end of the drainage shower guide valve is communicated with a sewage tank (19) through a sewage draining ground pipe (20), the inner tank (2) is communicated with the starting end of the oil removing main pipe (23) through an inner tank light oil removing pipeline (16), the inner tank light oil removing pipeline (16) is provided with a third isolation hand valve (11), the tail end of the second oil collecting main pipe (24) is communicated with the starting end of the oil removing main pipe (23), and the tail end of the oil removing main pipe (23) is communicated with the light oil collecting tank (12).
  2. 2. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1 is characterized in that a plurality of light oil receiving ports (3) with different heights are uniformly distributed on a tank body of an outer tank (1) along the vertical height direction, the positions of the uppermost light oil receiving port (3) and the lowermost light oil receiving port (3) are fixed, a plurality of light oil receiving ports (3) in the middle part are arranged according to the requirement, and the uppermost light oil receiving port (3) is level with the high liquid level control position of the outer tank (1).
  3. 3. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the negative pressure side interface of each remote interface meter (10) and the corresponding light oil receiving port (3) are positioned at the same elevation.
  4. 4. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the first oil collecting main pipe (7) is vertically arranged beside the outer tank (1), the second oil collecting main pipe (24) is obliquely arranged, and the included angle between the first oil collecting main pipe (7) and the second oil collecting main pipe (24) in the same vertical plane is more than or equal to 90 degrees and less than 180 degrees.
  5. 5. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1 is characterized in that a first isolation hand valve (4) and an electric two-position valve (5) are sequentially arranged on a horizontal pipeline of each oil receiving pipeline (6) according to the flowing direction of liquid, and the first isolation hand valve (4) is close to a light oil receiving port (3).
  6. 6. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1 is characterized in that the tail end of a nitrogen purging pipeline (22) is higher than an uppermost light oil receiving port (3), and a nitrogen purging valve (14) is arranged close to a first oil receiving main pipe (7).
  7. 7. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the connection of the discharge line (13) and the second oil collecting main pipe (24) is positioned at the lowest point in front of the second isolation hand valve (9) on the second oil collecting main pipe (24).
  8. 8. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the third isolation hand valve (11) is close to the joint of the second oil collecting main pipe (24) and the oil collecting main pipe (23).
  9. 9. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the diameter of a light oil receiving port (3) is DN50, the pipe diameter of an oil receiving pipeline (6) is DN50, the pipe diameter of a first oil receiving main pipe (7) is DN80, the pipe diameter of a discharge pipeline (13) is DN25, the pipe diameter of a nitrogen purging pipeline (22) is DN25, and the pipe diameter of a second oil receiving main pipe (24) is DN80; The oil collecting system heat tracing device comprises a first isolation hand valve (4), an electric two-position valve (5), an oil collecting pipeline (6), a first oil collecting main pipe (7), a pipeline viewing mirror (8), a second isolation hand valve (9), a remote transmission interface meter (10), a third isolation hand valve (11), a light oil collecting tank (12), a discharge pipeline (13), a discharge shower guiding valve (15), an inner tank light oil removing pipeline (16), a sewage draining ground pipe (20), a remote transmission liquid level meter (21), an oil removing main pipe (23) and a second oil collecting main pipe (24).
  10. 10. The semi-coke wastewater pretreatment oil stain recovery device according to claim 1, wherein the remote transmission interface meter (10) adopts a double-flange remote transmission interface meter, and the remote transmission liquid level meter (21) adopts a double-flange remote transmission liquid level meter; The first isolation hand valve (4), the second isolation hand valve (9), the third isolation hand valve (11), the nitrogen purging valve (14) and the discharge shower guiding valve (15) are all gate valves, and the electric two-position valve (5) is an electric ball valve.

Description

Semi-coke wastewater pretreatment greasy dirt recovery device Technical Field The utility model belongs to the field of coal chemical wastewater, and particularly relates to a semi-coke wastewater pretreatment oil stain recovery device. Background The semi-coke wastewater is wastewater generated in the middle-low temperature carbonization (500-650 ℃) process of coal, and mainly comes from circulating water for cooling and washing coal gas and separating water in the chemical production process. The semi-coke is a medium-low temperature carbonization product of coal, the tar amount produced in the production process is large, and the low molecular organic matters are large, so that the wastewater contains a large amount of pollutants which are not oxidized at high temperature, the concentration of the pollutants is about 10 times higher than that of the conventional coking wastewater, particularly the oil (namely coal tar) pollutants are higher, and the oil/phenol ratio of the pollutants is obviously higher than that of the conventional coking wastewater. The existing industrial semi-coke wastewater treatment device mainly comprises two parts of pretreatment (oil removal working section and phenol ammonia recovery working section) and biochemical treatment, wherein the oil content of the existing semi-coke wastewater after oil removal working section and dust removal is less than 1000mg/L, and the existing semi-coke wastewater enters the phenol ammonia recovery working section for further pretreatment. From the practical operation effect, the combination of the large tank sedimentation separation-three-type water conservancy hydrocyclone separation technology (i.e. tank-in-tank oil removal technology) and the coalescence oil remover technology is the most effective oil removal mode. However, in the actual operation process, the tank-in-tank oil removal technology only considers removal of light and heavy oil in the inner tank, and the outer tank oil removal has certain defects, so that the light oil separated from the water surface cannot be discharged, oil stains are returned to the wastewater, the oil stains enter the phenol-ammonia recovery device to block trays and fillers, the extraction effect is affected, the effluent is not up to the standard, the operation period and the production efficiency of the device are reduced, and the long-time stable operation of the device is not facilitated. The document with application number 202210582477.X discloses a method for collecting and conveying heavy oil additionally used for phenol-ammonia recovery, which only refers to a heavy oil collecting method, and does not refer to a removal mode of light oil on the liquid surface of an outer tank, the light oil on the water surface cannot be timely removed when the liquid level of the outer tank is high or low, an accumulated oil layer is thickened in the tank for a long time, when the liquid level of the outer tank is low or the water temperature is high (> 50 ℃), the light oil enters a subsequent phenol-ammonia recovery device along with raw water, enters an extraction unit to pollute an extractant after high-temperature steam stripping of a deacidification deamination tower, the extraction effect is affected, and the oil quality is changed (similar to asphalt) after high temperature, so that a tray and a filler are blocked, the separation efficiency of the device is reduced, the effluent index is unqualified, and the long-time stable operation of the device is affected. Disclosure of utility model Aiming at the defects of the prior art, the utility model aims to provide the semi-coke wastewater pretreatment oil stain recovery device. The technical scheme for solving the technical problems is that the utility model provides a semi-coke wastewater pretreatment oil stain recovery device, which is characterized by comprising a raw material water sedimentation tank, a light oil receiving port, a first isolation hand valve, an electric two-position valve, an oil receiving pipeline, a first oil receiving main pipe, a pipeline view mirror, a second isolation hand valve, a remote transmission interface meter, a third isolation hand valve, a light oil collecting tank, a discharge pipeline, a nitrogen purging valve, a discharge shower valve, an inner tank light oil removing pipeline, a semi-coke wastewater inlet pipeline, a semi-coke wastewater outlet, a sewage tank, a sewage disposal ground pipe, a remote transmission liquid level meter, a nitrogen purging pipeline, a deoiling main pipe, a second oil receiving main pipe and DCS; The raw material water sedimentation tank consists of an outer tank and an inner tank, wherein the inner tank is internally provided with oil removing equipment, the tail end of a semi-coke wastewater inlet pipeline is positioned in the oil removing equipment, a DCS is arranged in a central control room and is respectively in communication connection with an electric two-position valve, a remote tra