CN219009987U

CN219009987U - Ammonia still blowdown system

Info

Publication number: CN219009987U
Application number: CN202223525932.7U
Authority: CN
Inventors: 薛汝忠; ***; 李星; 李永华; 高伟; 周加银; 王伟; 陈娜娜; 曹锡全; 吴涛; 李剑
Original assignee: Shandong Iron and Steel Co Ltd
Current assignee: Shandong Iron and Steel Co Ltd
Priority date: 2022-12-16
Filing date: 2022-12-16
Publication date: 2023-05-12
Anticipated expiration: 2032-12-16

Abstract

The utility model relates to the technical field of coking waste treatment equipment, in particular to an ammonia still sewage disposal system which comprises an ammonia still, a tar filtering device, a steam reboiler, a heat exchanger and a collecting tank, wherein the tar filtering device is provided with an ammonia still wastewater inlet, an ammonia still wastewater outlet and a tar outlet, the ammonia still wastewater inlet and the ammonia still wastewater outlet are respectively positioned at the top of corresponding sides of the tar filtering device, the tar outlet is positioned below the same side of the ammonia still wastewater inlet, the ammonia still wastewater outlet is respectively connected to the steam reboiler and the heat exchanger, and the tar filtering device is connected to the collecting tank. According to the utility model, the tar filtering device is arranged to effectively filter tar in the ammonia distillation wastewater generated by the ammonia distillation tower, and the ammonia distillation wastewater enters other devices such as a steam reboiler or a heat exchanger after tar is filtered, so that the aggregation of unfiltered tar in heat exchange equipment is effectively avoided, the workload of operators on cleaning the heat exchange equipment is reduced, and the operation efficiency of an ammonia distillation tower system is improved.

Description

Ammonia still blowdown system

Technical Field

The utility model relates to the technical field of coking waste treatment equipment, in particular to an ammonia still sewage disposal system.

Background

The ammonia water generated in the coking process and the liquid alkali sent by the alkali tank are mixed and then exchange heat with the ammonia distillation wastewater extracted by the ammonia distillation tower, then enter the ammonia distillation tower for distillation, ammonia is extracted from the top of the ammonia distillation tower, and the ammonia distillation wastewater is extracted from the bottom of the ammonia distillation tower. Part of ammonia distillation wastewater flows into a steam reboiler, exchanges heat with steam and returns into the ammonia distillation tower after vaporization, and provides heat for distillation. Most ammonia distillation wastewater is pumped to a heat exchanger to exchange heat with the residual ammonia water, then enters a cooler, is cooled and is conveyed to a biochemical station for treatment. Because the ammonia water contains a certain amount of tar, the tar is accumulated at the bottom of the ammonia still after distillation, a drain pipeline leading to a collecting tank is arranged at the bottom of the ammonia still in the conventional ammonia still drain system, a drain valve is required to be opened for a period of time to drain the tar in the ammonia still, but the viscosity of the tar is higher, so that the tar is prevented from blocking the drain pipeline, the drain pipeline is required to be flushed by steam after each drainage, but the steam airflow can stir the tar at the bottom of the ammonia still, and the precipitation and the drainage of the tar are not facilitated; on the other hand, only the tar gathered at the bottom is discharged, so that the ammonia distillation wastewater flowing to a steam reboiler and pumped into a heat exchanger still carries part of tar, the heat exchange effect is affected, and if the treatment is not performed, equipment is blocked for a long time, and the shutdown and production stopping are caused.

Thus, there is a need for a blowdown system that effectively filters tar from ammonia still wastewater to ensure stable operation of the ammonia still system.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, and provides an ammonia still sewage disposal system, which is provided with a tar filtering device, wherein ammonia still wastewater generated by an ammonia still is filtered by the tar filtering device and then enters other heat exchange equipment, and filtered tar is discharged into a collecting tank, so that the ammonia still wastewater entering the heat exchange equipment is effectively ensured to be free of tar, tar cleaning operation in the heat exchange equipment is avoided, and the operation efficiency is effectively improved.

In order to achieve the technical effects, the utility model adopts the following technical scheme:

a sewage disposal system of an ammonia still comprises an ammonia still, a tar filtering device, a steam reboiler, a heat exchanger and a collecting tank;

the tar filtering device comprises a shell, a tar filter screen and an inclined partition board, wherein the inclined partition board is arranged in the shell, the left end of the inclined partition board is lower than the right end of the inclined partition board, the inner cavity of the shell is divided into an upper filter cavity and a lower heat exchange cavity by the inclined partition board, and the filter cavity is divided into a filter residue cavity on the left side and a filtrate cavity on the right side by the tar filter screen;

the shell is provided with an ammonia distillation wastewater inlet, an ammonia distillation wastewater outlet and a tar outlet, the ammonia distillation wastewater inlet and the tar outlet are communicated with a filter residue cavity, the tar outlet is clung to an inclined baffle plate, the ammonia distillation wastewater outlet is communicated with a filtrate cavity, the ammonia distillation wastewater inlet is connected to the bottom of the ammonia distillation tower, the ammonia distillation wastewater outlet is respectively connected to the steam reboiler and the heat exchanger, and the tar outlet is connected to the collecting tank;

the shell is provided with a steam inlet and a steam outlet, the steam inlet and the steam outlet are arranged below the inclined partition plate, and the steam inlet and the steam outlet are respectively connected with the steam reboiler.

According to the ammonia still blowdown system provided by the utility model, the tar filtering device is arranged to effectively filter tar in ammonia still wastewater generated by the ammonia still, and the ammonia still wastewater enters the steam reboiler or is pumped to other devices such as the heat exchanger through the heat exchanger after tar is filtered, so that the aggregation of unfiltered tar in the heat exchange equipment is effectively avoided, the workload of operators on cleaning the heat exchange equipment is reduced, and the operation efficiency of the ammonia still system is improved.

Utilize the steam that steam reboiler produced to heat the baffle to tar filter equipment in, thereby make the tar of adhesion on the baffle be heated and be convenient for discharge to the collecting vat in, because of steam only heats the baffle to one side below the baffle, consequently can not adhere to the tar, get back to in the steam reboiler again through the steam outlet and carry out reuse.

Preferably, the inclined partition plate is provided with a one-way valve which can be communicated in a one-way from bottom to top, the top end of the tar filtering device is provided with a second steam outlet, and the second steam outlet is positioned between the tar filter screen and the ammonia distillation wastewater outlet.

The filter screen is arranged in the tar filtering device and is used for filtering light tar which is not adhered to the inclined partition plate, and the normally closed one-way valve is arranged, so that steam can enter the upper part of the inclined partition plate to clear tar on the filter screen, and the steam above the inclined partition plate is discharged through the second steam outlet without returning to the steam reboiler because of being in direct contact with the tar, so that the carried tar is prevented from being enriched at the steam reboiler to further influence.

Preferably, the ammonia distillation wastewater outlet is provided with a tar monitor for monitoring the concentration of tar carried in the ammonia distillation wastewater outlet in real time, so that an operator can conveniently clean the tar filtering device according to whether the tar is carried in the outlet.

Further preferably, the ammonia still blowdown system comprises two tar filtering devices which are standby mutually. When tar is detected at the outlet of the tar filtering device, the other device is started to clean the tar detecting device by steam, so that the tar filtering device can work together all the time, and the continuous operation of the operation is ensured.

Still preferably, the ammonia still blowdown system further comprises a control assembly, the control assembly comprises a control piece and a tee joint, the tee joint is used for alternatively selecting one of the two tar filtering devices to be connected with the ammonia still blowdown system, the control piece is respectively and electrically connected with the tar monitor and the tee joint, and the control piece receives measured data of the tar monitor and controls the tee joint according to the measured data.

Through setting up control assembly and tar monitor and cooperating, withdraw to the tar filter equipment that monitors the tar and change spare device automatically to avoid operating personnel to fail in time to discover, and lead to the tar to produce the influence that the accumulation caused in heat transfer apparatus.

The beneficial effects of the utility model are as follows:

1. according to the ammonia still blowdown system provided by the utility model, the tar filtering device is arranged to effectively filter tar in ammonia still wastewater generated by the ammonia still, and the ammonia still wastewater enters other devices such as the steam reboiler or the heat exchanger after tar is filtered, so that the aggregation of unfiltered tar in heat exchange equipment is effectively avoided, the workload of operators on cleaning the heat exchange equipment is reduced, and the operation efficiency of the ammonia still system is improved.

2. According to the ammonia still blowdown system provided by the utility model, the inclined partition plate in the tar filtering device is heated by utilizing steam generated by the steam reboiler, so that tar adhered to the inclined partition plate is heated to be conveniently discharged into the collecting tank, and the steam only heats the inclined partition plate below the inclined partition plate, so that tar cannot be adhered, and the tar returns to the steam reboiler again through the steam outlet for reuse.

3. In the ammonia still blowdown system provided by the utility model, two mutually standby tar filtering devices are arranged, and the three-way is controlled to automatically select the tar filtering devices according to data measured by the tar monitor through the control component, so that the influence caused by accumulation of tar in heat exchange equipment due to failure of an operator to discover in time is avoided.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 provided by the present utility model;

FIG. 2 is a schematic diagram of the tar filtering apparatus in embodiment 1 according to the present embodiment;

FIG. 3 is a schematic structural view of embodiment 2 provided by the present utility model;

FIG. 4 is a schematic view showing the structure of the inclined separator in embodiment 2 according to the present utility model;

wherein, 1, an ammonia distillation tower; y-valve; 102. a reboiler valve; 103. a first tee; 104. a second tee; 105. a third tee; 106. a fourth tee; 107. a fifth tee; 2. tar filtering device; 21. an ammonia distillation wastewater inlet; 22. an ammonia distillation wastewater outlet; 23. a tar outlet; 24. a steam inlet; 25. a steam outlet; 26. a second steam outlet; 201. a housing; 202. a tar filter screen; 203. an inclined partition plate; 204. a one-way valve; 3. a steam reboiler; 4. a heat exchanger; 5. a collection tank; 61. a control member; 62. tar monitor.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and examples.

Example 1:

as shown in fig. 1, an ammonia still 1, a tar filtering device 2, a steam reboiler 3, a heat exchanger 4 and a collecting tank 5 of an ammonia still sewage system;

as shown in fig. 2, the tar filtering apparatus 2 includes a casing 201, a tar filtering screen 202, and an inclined partition 203, where the inclined partition 203 is disposed inside the casing 201, and the left end of the inclined partition 203 is lower than the right end, and the inclined partition 203 divides the inner cavity of the casing 201 into an upper filtering cavity and a lower heat exchange cavity, and the tar filtering screen 202 divides the filtering cavity into a left filtering residue cavity and a right filtrate cavity;

the shell 201 is provided with an ammonia distillation wastewater inlet 21, an ammonia distillation wastewater outlet 22 and a tar outlet 23, the ammonia distillation wastewater inlet 21 and the tar outlet 23 are communicated with a filter residue cavity, the tar outlet 23 is closely attached to an inclined partition plate 203, the ammonia distillation wastewater outlet 22 is communicated with a filtrate cavity, the ammonia distillation wastewater inlet 21 is connected to the bottom of the ammonia distillation tower 1, the ammonia distillation wastewater outlet 22 is respectively connected to the steam reboiler 3 and the heat exchanger 4, and the tar outlet 23 is connected to the collecting tank 5;

the shell 201 is provided with a steam inlet 24 and a steam outlet 25, the steam inlet 24 and the steam outlet 25 are arranged below the inclined partition 203, and the steam inlet 24 and the steam outlet 25 are respectively connected with the steam reboiler 3.

The inclined partition plate 203 is provided with a one-way valve 204 which can be communicated from bottom to top in a one-way, the top end of the tar filtering device 2 is provided with a second steam outlet 26, and the second steam outlet 26 is positioned between the tar filter screen 202 and the ammonia distillation wastewater outlet 22.

When the device is specifically used, ammonia distillation wastewater generated at the bottom of the ammonia distillation tower 1 is conveyed into the tar filtering device 2 in real time, collected tar is discharged into the collecting tank 5 through the tar outlet 23 by filtering of the tar filter screen 202 and deposition of the inclined partition plate 203, and ammonia distillation wastewater without tar is respectively conveyed into the steam reboiler 3 and the heat exchanger 4 through the Y-shaped valve 101 so as to prevent the tar from directly entering the heat exchange equipment without being filtered.

When the device runs for a period of time, the heat exchanger valve 102 is closed, at the moment, steam generated by the steam reboiler 3 enters the steam inlet 24 from a pipeline to heat the inclined partition 203, deposited tar is removed, at the moment, part of the steam enters the upper part of the inclined partition 203 through the normally closed one-way valve 204, and part of the steam returns to the steam reboiler 3 through the steam outlet 25; the steam entering the upper part of the inclined partition plate 203 cannot return to the lower part of the inclined partition plate 203 due to the influence of the one-way valve 204, so that only after the tar filter screen 202 is cleaned, part of tar is carried into the collecting tank 5 through the second steam outlet 26, and the cleaning of the tar filtering device 2 is completed.

Example 2:

as shown in fig. 4, this embodiment is different from embodiment 1 in that the tar monitor 62 is disposed at the ammonia still waste water outlet 22, so that an operator can clean the tar filtering device according to whether the tar is carried by the outlet. In this embodiment, the tar monitor 62 may be the tar monitor 62 used in chinese patent document CN 211420084U (application No. 202922291105.8), or other existing commercial devices. The ammonia still blowdown system comprises two tar filtering devices 2 which are standby. The ammonia still blowdown system further comprises a control assembly, the control assembly comprises a control piece 61 and a tee joint, the tee joint is used for alternatively selecting one of the two tar filtering devices 2 to be connected into the ammonia still blowdown system, the control piece 61 is respectively and electrically connected with the tar monitor 62 and the tee joint, and the control piece 61 receives measured data of the tar monitor 62 and controls the tee joint according to the measured data. In this embodiment, the control member 61 is a PLC, or may be another existing device with a control function. The tee joint is an electric control tee joint, and can be selected from V5329C1059 type electric control tee joints of Honival corporation, and can also be selected from other electric control tee joints capable of realizing the same function.

Specifically, as shown in fig. 4, the tee joint in this embodiment includes a first tee joint 103 located between the ammonia still 1 and the ammonia still wastewater inlet 21, a second tee joint 104 located between the tar outlet 23 and the collecting tank 5, a third tee joint 105 located between the ammonia still wastewater outlet 22 and the Y-valve 101, a fourth tee joint 106 located between the steam inlet 24 and the steam reboiler 3, and a fifth tee joint 107 located between the steam outlet 25 and the steam reboiler 3, and by setting the tee joints, the automatic switching of the tar filtering device 2 into the ammonia still blowdown system by the control member 62 is achieved.

Claims

1. The ammonia still blowdown system is characterized by comprising an ammonia still (1), a tar filtering device (2), a steam reboiler (3), a heat exchanger (4) and a collecting tank (5);

the tar filtering device (2) comprises a shell (201), a tar filter screen (202) and an inclined partition board (203), wherein the inclined partition board (203) is arranged inside the shell (201), the left end of the inclined partition board (203) is lower than the right end, the inclined partition board (203) divides an inner cavity of the shell (201) into an upper filter cavity and a lower heat exchange cavity, and the tar filter screen (202) divides the filter cavity into a filter residue cavity on the left side and a filtrate cavity on the right side;

the ammonia distillation device is characterized in that an ammonia distillation wastewater inlet (21), an ammonia distillation wastewater outlet (22) and a tar outlet (23) are formed in the shell (201), the ammonia distillation wastewater inlet (21) and the tar outlet (23) are communicated with a filter residue cavity, the tar outlet (23) is tightly clung to an inclined partition plate (203), the ammonia distillation wastewater outlet (22) is communicated with a filtrate cavity, the ammonia distillation wastewater inlet (21) is connected to the bottom of the ammonia distillation tower (1), the ammonia distillation wastewater outlet (22) is respectively connected to the steam reboiler (3) and the heat exchanger (4), and the tar outlet (23) is connected to the collecting tank (5);

the steam reboiler is characterized in that the shell (201) is provided with a steam inlet (24) and a steam outlet (25), the steam inlet (24) and the steam outlet (25) are both arranged below the inclined partition plate (203), and the steam inlet (24) and the steam outlet (25) are respectively connected with the steam reboiler (3).

2. The ammonia still blowdown system of claim 1, wherein the inclined partition plate (203) is provided with a one-way valve (204) capable of conducting in a one-way from bottom to top, a second steam outlet (26) is formed in the top end of the tar filtering device (2), and the second steam outlet (26) is located between the tar filter screen (202) and the ammonia still wastewater outlet (22).

3. The ammonia still blowdown system of claim 1, wherein a tar monitor (62) is provided at the ammonia still wastewater outlet (22).

4. A system according to claim 3, characterized in that it comprises two sets of tar filtering devices (2) in reserve for each other.

5. The ammonia still blowdown system of claim 4 further comprising a control assembly, said control assembly comprising a control member (61) and a tee for selectively connecting one of said two tar filtering devices (2) to the ammonia still blowdown system, said control member (61) being electrically connected to said tar monitor (62) and said tee, respectively, said control member (61) receiving measured data from said tar monitor (62) and controlling said tee based on the measured data.