CN218202270U

CN218202270U - Waste heat recovery device and high ammonia nitrogen sewage treatment equipment

Info

Publication number: CN218202270U
Application number: CN202222491629.3U
Authority: CN
Inventors: 甘孝勇; 倪黎; 肖成武; 韩勇; 戴劲; 曾浩
Original assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Catalyst Co
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2023-01-03
Anticipated expiration: 2032-09-20

Abstract

The utility model relates to a high ammonia nitrogen sewage deamination technical field discloses a waste heat recovery device and high ammonia nitrogen sewage treatment device, and the waste heat recovery device includes heat exchanger, venturi water sprayer and compound steam stripping device, wherein, be provided with the inhalant canal that high ammonia nitrogen sewage circulates and the drainage channel that supplies deamination waste water to circulate in the heat exchanger, the water inlet of inhalant canal is connected with sewage inlet line, the delivery port of inhalant canal passes through sewage outlet line and communicates with the water inlet of venturi water sprayer, the delivery port of venturi water sprayer passes through pipeline and communicates with compound steam stripping device; the water outlet of the drainage channel is connected with a wastewater outlet pipeline, and the water inlet of the drainage channel is communicated with the water outlet of the composite stripping device through a wastewater inlet pipeline; the heat of the deamination waste water can be recovered by the high ammonia nitrogen sewage treatment device and the waste heat recovery device in the steam stripping production, and the high ammonia nitrogen sewage is preheated, so that the steam consumption is reduced.

Description

Waste heat recovery device and high ammonia nitrogen sewage treatment equipment

Technical Field

The utility model relates to a high ammonia nitrogen sewage deamination technical field specifically relates to a waste heat recovery device and high ammonia nitrogen sewage treatment device.

Background

The stripping column is a unit for recovering the absorbed solute and separating the absorbent from the solute to obtain regeneration. In the stripping column, the contaminated water is contacted with steam on the trays, the contaminated water flows horizontally along the trays, the steam flows vertically upwards through the holes in the trays, and the concentration of volatile compounds in the steam leaving the trays is high. Accordingly, the concentration of the volatile components in the effluent leaving the tray is lower than when it enters the tray.

CN102190341B discloses a heat pump flash evaporation strip deamination method, which absorbs ammonia nitrogen-rich steam after stripping deamination through an absorption tower, the purified steam is recycled after being pressurized by a heat pump unit, the deaminated wastewater is directly heated and pretreated high ammonia nitrogen wastewater after being flashed by a vacuum flash evaporation unit consisting of a Venturi and a liquid ring vacuum pump. Treated wastewater led out from the bottom of the stripping tower is subjected to primary flash evaporation or secondary flash evaporation, and is subjected to vapor-liquid direct heat exchange with untreated ammonia nitrogen wastewater through primary injection or secondary injection, the ammonia nitrogen wastewater after heat absorption enters a wastewater storage tank, and then is conveyed to a pipeline mixer by a feeding pump of the stripping tower to be mixed with alkali liquor and then enters a wastewater inlet distribution pipe of the stripping tower.

However, even after the deamination wastewater is subjected to primary flash evaporation, secondary flash evaporation and venturi recovery of a part of heat, the discharge temperature of the deamination wastewater is still high and reaches 52-62 ℃; a large part of heat of the deamination wastewater is not recycled, so that the temperature difference between an inlet and an outlet of the composite stripping device is large, and the steam consumption of the composite stripping device is large.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the deamination waste water that prior art exists and passing through one-level flash distillation, second grade flash distillation and venturi retrieve partly heat after, the discharge temperature of deamination waste water is still higher, reach 52 ~ 62 ℃, deamination waste water is also very big heat by recycle, it is great to cause stripping device to import and export the difference in temperature, the big problem of stripping device steam consumption, a waste heat recovery device and high ammonia nitrogen sewage treatment device are provided, the heat of deamination waste water can be retrieved to this processing apparatus of high ammonia nitrogen sewage and the waste heat recovery device in the steam stripping production, and preheat high ammonia nitrogen sewage, reduce the steam consumption.

In order to achieve the above object, the present invention provides a waste heat recovery device, which includes a heat exchanger, a venturi water ejector and a composite stripping device, wherein a water inlet channel for circulating high ammonia nitrogen sewage and a water drainage channel for circulating deamination wastewater are provided in the heat exchanger, a sewage inlet pipe is connected to a water inlet of the water inlet channel, a water outlet of the water inlet channel is communicated with a water inlet of the venturi water ejector through a sewage outlet pipe, and a water outlet of the venturi water ejector is communicated with the composite stripping device through a pipe; the water outlet of the drainage channel is connected with a wastewater outlet pipeline, and the water inlet of the drainage channel is communicated with the water outlet of the composite stripping device through a wastewater inlet pipeline.

Preferably, the water discharge channel and the water inlet channel are both provided in a spiral shape.

Preferably, thermometers for measuring water temperature are installed at the water inlet and the water outlet of the water drainage channel and the water inlet channel.

Preferably, the wastewater inlet pipeline, the wastewater outlet pipeline, the water outlet of the venturi water ejector and the pipeline connected between the composite stripping device are all wrapped by insulating layers.

Preferably, the heat-insulating layer at least comprises a layer of heat-insulating cotton.

Preferably, a wastewater discharge conveying pump for conveying the deamination wastewater in the composite stripping device to a water inlet of the drainage channel is arranged on the wastewater inlet pipeline.

Preferably, the water inlet and the water outlet of the drainage channel and the water inlet channel are connected with pipelines through flanges.

The utility model provides a high ammonia nitrogen sewage treatment device on the other hand, high ammonia nitrogen sewage treatment device includes preprocessing device and foretell waste heat recovery device, preprocessing device is used for subsiding the suspended solid in the high ammonia nitrogen sewage and carries high ammonia nitrogen sewage to the heat exchanger.

Preferably, the pretreatment device comprises a radial flow sedimentation tank for sedimentation of the high ammonia nitrogen sewage and a sedimentation intermediate tank for receiving overflow water of the radial flow sedimentation tank, and a delivery pump and a pipeline for delivering the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank and the heat exchanger.

Preferably, the pretreatment device further comprises a storage device which is arranged between the sedimentation intermediate tank and the heat exchanger and used for storing and secondarily sedimentating the high ammonia nitrogen sewage, and a conveying pump and a pipeline which are used for conveying the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank and the storage device and between the storage device and the heat exchanger.

Preferably, the storage device comprises a homogenizing tank and a buffer pool, and a delivery pump and a pipeline for delivering the high ammonia nitrogen sewage to the buffer pool are arranged between the homogenizing tank and the buffer pool.

Through the technical scheme, the high ammonia nitrogen sewage enters the heat exchanger from the sewage inlet pipeline and the water inlet of the water inlet channel, and the deamination wastewater subjected to primary flash evaporation and secondary flash evaporation is conveyed to the water outlet channel from the composite stripping device through the wastewater inlet pipeline; the high ammonia nitrogen sewage with lower temperature and the deamination waste water with higher temperature respectively enter the water inlet channel and the water drainage channel of the heat exchanger for heat exchange, namely the heat of the deamination waste water is lost to the high ammonia nitrogen sewage, so that the temperature of the deamination waste water is reduced, and the temperature of the high ammonia nitrogen sewage is increased. Practice shows that the drainage temperature of the deamination wastewater can be reduced to 30-36 ℃ from the original 52-62 ℃, and meanwhile, the temperature of the high ammonia nitrogen sewage is correspondingly increased. The high ammonia nitrogen sewage flows to the Venturi water ejector through the sewage water outlet pipeline and exchanges heat with steam introduced from the flash evaporation section of the composite stripping device, and the temperature of the high ammonia nitrogen sewage is correspondingly increased after the high ammonia nitrogen sewage exchanges heat with the deamination wastewater in the heat exchanger, so that the steam amount required by temperature increase is correspondingly reduced.

Drawings

The line segment of each device in series in the figure represents a pipeline, and the arrow in the figure represents the flow direction of the high ammonia nitrogen sewage or the deamination wastewater;

FIG. 1 is a schematic view of an embodiment of the high ammonia nitrogen sewage treatment equipment of the utility model.

Description of the reference numerals

1-heat exchanger, 2-Venturi water injector, 3-composite stripping device, 4-waste water discharge delivery pump, 5-heat insulation layer, 6-radial flow sedimentation tank, 7-sedimentation intermediate tank, 8-delivery pump, 9-homogenizing tank, 10-buffer tank, 11-sewage inlet pipeline, 12-sewage outlet pipeline, 13-waste water outlet pipeline, 14-waste water inlet pipeline.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings. It is to be understood that the description of the embodiments herein is for purposes of illustration and explanation only and is not intended to limit the invention.

In the present invention, unless otherwise specified, the terms "upper, lower, top, bottom, far, near, side" and the like included in the terms "an orientation" merely represent an orientation of the terms in a conventional use state or a colloquial meaning understood by those skilled in the art, and should not be construed as limiting the terms.

The utility model provides a waste heat recovery device, the utility model provides a waste heat recovery device on the one hand, waste heat recovery device includes heat exchanger 1, venturi water ejector 2 and compound stripping device 3, wherein, be provided with the inhalant canal that high ammonia nitrogen sewage circulates and the drainage channel that supplies deamination waste water to circulate in the heat exchanger 1, inhalant canal's water inlet is connected with sewage inlet line 11, inhalant canal's delivery port communicates with venturi water ejector 2's water inlet through sewage outlet line 12, venturi water ejector 2's delivery port communicates with compound stripping device 3 through the pipeline; the water outlet of the drainage channel is connected with a waste water outlet pipeline 13, and the water inlet of the drainage channel is communicated with the water outlet of the composite stripping device 3 through a waste water inlet pipeline 14.

The specific process of recovering the waste heat of the deamination wastewater by using the waste heat recovery device is as follows: the high ammonia nitrogen sewage enters from the sewage inlet pipeline 11 and enters into the heat exchanger 1 from the water inlet of the water inlet channel. Meanwhile, the deamination wastewater subjected to the primary flash evaporation and the secondary flash evaporation is conveyed to a drainage channel from the composite stripping device 3 through a wastewater inlet pipeline 14. The high ammonia nitrogen sewage with lower temperature and the deamination waste water with higher temperature respectively enter a water inlet channel and a water outlet channel of the heat exchanger 1 for heat exchange, namely, the heat of the deamination waste water is lost to the high ammonia nitrogen sewage, so that the temperature of the deamination waste water is reduced, and the temperature of the high ammonia nitrogen sewage is increased. Practice shows that the drainage temperature of the deamination wastewater can be reduced to 30-36 ℃ from the original 52-62 ℃, and meanwhile, the temperature of the high ammonia nitrogen sewage is correspondingly increased.

The high ammonia nitrogen sewage flows to the Venturi water ejector 2 through the sewage water outlet pipeline 12 and then exchanges heat with steam introduced from the flash evaporation section of the composite stripping device 3, and the temperature of the high ammonia nitrogen sewage is correspondingly increased after the high ammonia nitrogen sewage exchanges heat with the deamination wastewater in the heat exchanger 1, so that the steam amount required by temperature rise is correspondingly reduced, and the steam consumption is reduced by about three fifths in actual operation. The deamination waste water is discharged from a waste water outlet pipeline 13, and the water discharging temperature is reduced.

In this embodiment, both the drain channel and the inlet channel are arranged in a spiral, i.e. the heat exchanger 1 is arranged as a spiral plate heat exchanger. The spiral plate heat exchanger is a heat exchanger 1 which is formed by coiling two parallel metal plates into two spiral channels and exchanges heat between cold and hot fluids through a spiral plate wall. The spiral plate heat exchanger can increase the length of the channel under the condition that the volume of the heat exchanger 1 is not changed, namely, the heat exchange path is increased, so that the purpose of enhancing the heat exchange effect is achieved. The spiral plate heat exchanger can be arranged in a detachable way, namely, a plurality of punched corrugated thin plates are sealed at certain intervals at the periphery by gaskets, and are overlapped and compressed by a frame and a compression spiral, four corner holes of the plate and the gaskets form a fluid distribution pipe and a fluid collection pipe, and simultaneously, cold and hot fluids are reasonably separated to flow in flow channels on two sides of each plate respectively to carry out heat exchange through the plate.

In this embodiment, the thermometer that is used for measuring the temperature is all installed to the water inlet and the delivery port of drainage channel and inhalant canal, the temperature of high ammonia nitrogen sewage and deamination waste water around can real-time monitoring heat transfer, and audio-visual feedback heat exchanger 1's heat transfer effect, when the heat transfer effect reduces, also can in time discover and overhaul heat exchanger 1.

In the embodiment, the wastewater inlet pipeline 14, the wastewater outlet pipeline 12, and the pipelines connected between the water outlet of the venturi water injector 2 and the composite stripping device 3 are all wrapped by the insulating layers 5. On one hand, the heat of the heated high ammonia nitrogen sewage flowing out of the water outlet of the water inlet channel can be prevented from losing in the pipeline conveying process; on the other hand, the deamination wastewater can be prevented from losing heat in a pipeline flowing to a drainage channel of the heat exchanger 1 after being discharged from the composite stripping device 3, so that the temperature of the high ammonia nitrogen sewage after heat exchange is ensured to reach a corresponding height, and the steam consumption is reduced.

In this embodiment, heat preservation 5 includes the thermal-insulated cotton of one deck at least, and thermal-insulated cotton has high temperature resistant, difficult burning and the characteristics that coefficient of heat conductivity is little, wraps up outside the pipeline, can reduce the heat loss that corresponds the interior high ammonia nitrogen sewage of pipeline and deamination waste water.

In the present embodiment, a wastewater discharge transfer pump 4 for transferring the deamination wastewater in the composite stripping apparatus 3 to the water inlet of the drainage channel is provided on the wastewater inlet line 14. Even if the position of the composite stripping device 3 is lower, the deamination wastewater can be forcibly supplied into the heat exchanger 1 through the wastewater discharge conveying pump 4, the use is convenient, and the external interference is less.

In this embodiment, drainage channel and inhalant canal's water inlet and delivery port all pass through flange and pipe connection, have not only improved the leakproofness, and connection stability is high moreover, convenient to install and dismantle.

The utility model also provides a high ammonia nitrogen sewage treatment device, high ammonia nitrogen sewage treatment device include the foretell waste heat recovery device of preprocessing device, and preprocessing device is used for subsiding the suspended solid in the high ammonia nitrogen sewage and carries high ammonia nitrogen sewage to heat exchanger 1.

In the actual operation process, the suspended solid in the high ammonia nitrogen sewage is required to be settled down through the pretreatment device, the suspended solid is reduced to below 40ppm, and then the high ammonia nitrogen sewage can be treated in the next step by entering the composite stripping device 3, so that the damage of the composite stripping device 3 caused by overhigh concentration of the suspended solid can be avoided.

In this embodiment, the pretreatment device comprises a radial flow sedimentation tank 6 for sedimentation of the high ammonia nitrogen sewage and a sedimentation intermediate tank 7 for receiving overflow water of the radial flow sedimentation tank 6, and a delivery pump 8 and a pipeline for delivering the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank 7 and the heat exchanger 1.

When subsiding the suspended solid, high ammonia nitrogen sewage flows into earlier in the radial flow sedimentation tank 6, and the suspended solid in the sewage subsides at the bottom of the pool of radial flow sedimentation tank 6, and the volume of radial flow sedimentation tank 6 can satisfy high ammonia nitrogen sewage settlement more than 8 hours best to export the suspended solid below 40 ppm. The high ammonia nitrogen sewage that subsides the completion overflows from the radiation flow sedimentation tank 6, and the high ammonia nitrogen sewage of overflow flows into in the middle pond 7 of subsiding, and high ammonia nitrogen sewage can temporarily be deposited to the middle pond 7 of subsiding, and after the high ammonia nitrogen sewage in the middle pond 7 of subsiding accumulated a quantitative, the high ammonia nitrogen sewage that can use delivery pump 8 to deposit middle pond 7 through the pipeline and squeeze into heat exchanger 1 and the heat transfer is carried out to deamination waste water.

In this embodiment, the pretreatment device further comprises a storage device which is arranged between the sedimentation intermediate tank 7 and the heat exchanger 1 and used for storing and secondarily settling the high ammonia nitrogen sewage, and a delivery pump 8 and pipelines which are used for delivering the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank 7 and the storage device and between the storage device and the heat exchanger 1.

High ammonia nitrogen sewage in the sedimentation intermediate tank 7 can be pumped to a storage device through a delivery pump 8 and a pipeline for secondary sedimentation, and the concentration of suspended matters is further reduced. And the high ammonia nitrogen sewage after the secondary sedimentation is stored in the storage device, and after the high ammonia nitrogen sewage in the storage device is accumulated to a certain amount, the high ammonia nitrogen sewage in the storage device can be pumped into the heat exchanger 1 by a delivery pump 8 through a pipeline to exchange heat with the deamination wastewater.

In this embodiment, the storage device comprises a homogenizing tank 9 and a buffer tank 10, and a delivery pump 8 and a pipeline for delivering high ammonia nitrogen sewage to the buffer tank 10 are arranged between the homogenizing tank 9 and the buffer tank 10.

The homogenizing tank 9 is used for secondary sedimentation of the high ammonia nitrogen sewage and serves as a storage tank of the high ammonia nitrogen sewage. High ammonia nitrogen sewage secondary settlement back is through transfer pump 8 cooperation pipeline, carries the high ammonia nitrogen sewage in the homogeneity jar 9 to the buffer pool 10 in, again via transfer pump 8 and pipeline transport to the heat exchanger 1 in, buffer pool 10 is used as the water inlet, the play water buffer structure that supports compound stripping device 3 normal operating.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical idea scope of the present invention, it can be right to the technical solution of the present invention perform a plurality of simple modifications, including each specific technical feature combined in any suitable manner, for example, to avoid unnecessary repetition, the present invention does not explain additionally to various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The waste heat recovery device is characterized by comprising a heat exchanger (1), a Venturi water ejector (2) and a composite stripping device (3), wherein a water inlet channel for high ammonia nitrogen sewage circulation and a water drainage channel for deamination wastewater circulation are arranged in the heat exchanger (1), a sewage inlet pipeline (11) is connected to a water inlet of the water inlet channel, a water outlet of the water inlet channel is communicated with a water inlet of the Venturi water ejector (2) through a sewage outlet pipeline (12), and a water outlet of the Venturi water ejector (2) is communicated with the composite stripping device (3) through a pipeline; the water outlet of the drainage channel is connected with a waste water outlet pipeline (13), and the water inlet of the drainage channel is communicated with the water outlet of the composite stripping device (3) through a waste water inlet pipeline (14).

2. The heat recovery device of claim 1, wherein the water drain channel and the water inlet channel are each arranged in a spiral.

3. The waste heat recovery device of claim 1, wherein a thermometer for measuring water temperature is installed at each of the water inlet and the water outlet of the water discharge passage and the water inlet passage.

4. The waste heat recovery device according to claim 1, wherein the waste water inlet pipeline (14), the sewage outlet pipeline (12) and the pipeline connected between the water outlet of the venturi water injector (2) and the composite stripping device (3) are wrapped by insulating layers (5).

5. A waste heat recovery device according to claim 4, characterized in that the insulating layer (5) comprises at least one layer of insulating cotton.

6. The waste heat recovery device according to any one of claims 1-5, characterized in that a waste water discharge conveying pump (4) for conveying the deamination waste water in the composite stripping device (3) to the water inlet of the water drainage channel is arranged on the waste water inlet pipeline (14).

7. High ammonia nitrogen sewage treatment equipment, characterized in that, high ammonia nitrogen sewage treatment equipment includes pretreatment device and the waste heat recovery device of any one of claims 1-6, the pretreatment device is used for settling suspended matters in high ammonia nitrogen sewage and conveying the high ammonia nitrogen sewage to the heat exchanger (1).

8. The high ammonia nitrogen sewage treatment equipment according to claim 7, wherein the pretreatment device comprises a radial flow sedimentation tank (6) for sedimentation of high ammonia nitrogen sewage and a sedimentation intermediate tank (7) for receiving overflow water of the radial flow sedimentation tank (6), and a delivery pump (8) and a pipeline for delivering the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank (7) and the heat exchanger (1).

9. The high ammonia nitrogen sewage treatment equipment according to claim 8, wherein the pretreatment device further comprises a storage device arranged between the sedimentation intermediate tank (7) and the heat exchanger (1) and used for storing and secondarily settling the high ammonia nitrogen sewage, and a conveying pump (8) and a pipeline for conveying the high ammonia nitrogen sewage are arranged between the sedimentation intermediate tank (7) and the storage device and between the storage device and the heat exchanger (1).

10. The high ammonia nitrogen sewage treatment equipment according to claim 9, wherein the storage device comprises a homogenizing tank (9) and a buffer tank (10), and a delivery pump (8) and a pipeline for delivering high ammonia nitrogen sewage to the buffer tank (10) are arranged between the homogenizing tank (9) and the buffer tank (10).