Coking wastewater treatment concentration kettle dead steam recycling system
By using the concentration kettle exhaust steam in the coking wastewater treatment system for heating the concentrated brine heat exchanger, the energy loss problem caused by the unused exhaust steam is solved, and significant energy saving effect and process stability are achieved.
Patent Information
- Application Number
- CN202422241050.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-09-13
AI Technical Summary
In the treatment of coking wastewater, the exhausted steam discharged from the concentration kettle cannot be effectively reused, resulting in large energy loss. The concentrated brine heat exchanger consumes a lot of steam, and lacks effective energy-saving methods.
After the concentration kettle is treated with a steam dehydrator, it is used to heat the salt water heat exchanger to achieve the reuse of the steam. The steam dehydrator, condensed water discharge and dry steam outlet pipeline are installed in the system to ensure the stability of steam pressure and temperature.
It effectively saves steam consumption, especially steam consumption of concentrated brine heat exchangers, achieves significant energy saving effect, improves pressure and temperature stability, and improves process stability.
Smart Images
Figure CN223134160U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the reuse of exhausted steam, in particular to a system for reusing the exhausted steam of a concentration kettle for treating coking wastewater, belonging to the field of environmental protection technology. Background Technique
[0002] In the treatment of coking wastewater, the wastewater enters the concentration kettle after membrane treatment and a concentrated brine heat exchanger. The concentration kettle uses steam heating to further concentrate the high-salt-content wastewater. Taking a group of concentration kettles adopted by the applicant as an example, the pressure of the steam used is 0.9 MPa, the temperature is 180 °C, and the usage amount is 2,000 - 2,200 tons per month. The steam discharged after the concentration kettle is used is exhausted steam, and its temperature is between 120 and 130 °C, and the pressure is about 0.4 MPa. In the operation of the traditional concentration kettle process, the exhausted steam discharged from the concentration kettle is basically not reused, which causes relatively large energy loss. There is also a concentrated brine heat exchanger process before the concentration kettle that also consumes steam (the steam consumed is in the same circuit as the steam consumed by the concentration kettle). The function of the brine heat exchanger is to perform low-temperature evaporation on the brine. Its incoming water is at room temperature, and the heated temperature is between 80 and 90 °C, and the monthly steam consumption is about 500 tons. If the exhausted steam discharged from the concentration kettle can be used on the brine heat exchanger, the steam consumed by the brine heat exchanger can be saved, and obvious benefits can be generated. Summary of the Invention
[0003] The purpose of the utility model is to provide a system for reusing the exhausted steam of a concentration kettle for treating coking wastewater.
[0004] To achieve the purpose of the utility model, the following technical solution is adopted: A system for reusing the exhausted steam of a concentration kettle for treating coking wastewater includes a plurality of concentration kettles. Each concentration kettle is provided with a steam inlet pipe and an exhausted steam outlet pipe. All the exhausted steam outlet pipes are connected to an exhausted steam and condensate collection pipeline. The exhausted steam and condensate collection pipeline is connected to an exhausted steam dehydrator. The lower part of the exhausted steam dehydrator is connected with a condensate outlet pipe. At the top of the exhausted steam dehydrator, a dry exhausted steam outlet pipeline is connected. The dry exhausted steam outlet pipeline is connected to the steam heating inlet pipeline of a concentrated brine heat exchanger. The outlet of the steam heating pipeline on the concentrated brine heat exchanger is the condensate outlet.
[0005] Further, a safety valve is installed at the top of the exhausted steam dehydrator.
[0006] Further, an emptying pipe is installed at the bottom of the exhausted steam dehydrator, and an emptying valve is installed on the emptying pipe. The condensate outlet pipeline is connected to the side of the exhausted steam dehydrator near the bottom.
[0007] Further, the rear end of the condensate outlet pipe is connected with a vertical pipe that extends upward. The vertical pipe is connected with a condensate drain pipe, and a drain valve is installed on the condensate drain pipe.
[0008] The positive and beneficial technical effects of the present utility model are as follows: The waste steam reuse system of the present utility model can effectively save energy, and the pressure of the output waste steam is relatively stable, which will be specifically described in detail in combination with the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 is a schematic diagram of the present utility model.
[0010] Figure 2 is Figure 1 a partial enlarged schematic diagram in SPECIFIC EMBODIMENTS
[0011] In order to more fully explain the implementation of the present utility model, embodiments of the present utility model are provided. These embodiments are only for the elaboration of the present utility model and do not limit the scope of the present utility model.
[0012] The present utility model will be further explained in detail in combination with the attached drawings. The marks in the drawings are as follows: 1: concentration kettle; 2: steam inlet pipe; 3: waste steam outlet pipe; 4: waste steam and condensate collection pipeline; 5: brine heat exchanger; 6: dry waste steam outlet pipeline; 7: condensate outlet pipe; 8: safety valve; 9: brine heat exchanger; 10: steam heating inlet pipeline; 11: condensate outlet; 12: drain valve; 13: vertical pipe; 14: drain valve; 15: condensate drain pipe.
[0013] As shown in the attached drawings, the waste steam reuse system for coking wastewater treatment concentration kettle includes a plurality of concentration kettles 1. Each concentration kettle 1 is provided with a steam inlet pipe 2 and a waste steam outlet pipe 3. All the waste steam outlet pipes 3 are connected to the waste steam and condensate collection pipeline 4. The waste steam and condensate collection pipeline 4 is connected to the waste steam dehydrator 6. The lower part of the waste steam dehydrator is connected with a condensate outlet pipe 7. The condensate outlet pipeline is connected to the side of the waste steam dehydrator near the bottom. The rear end of the condensate outlet pipe 7 is connected with a vertical pipe 13 extending vertically upward. The vertical pipe is connected with a condensate drain pipe 15. A drain valve 15 is installed on the condensate drain pipe. In this way of draining condensate, the drain valve 15 is closed at the start. After the condensate exceeds the condensate outlet pipe 7, the drain valve can be kept open. When the liquid level in the waste steam dehydrator exceeds the height of the condensate drain pipe 15, it will drain automatically, so that the liquid level and water temperature in the waste steam dehydrator can be basically kept stable, and the steam temperature and pressure in the dry waste steam outlet pipeline can also be kept stable, thus maintaining the stability of the process. A safety valve 8 is installed at the top of the waste steam dehydrator, and an exhaust pipe is installed at the bottom of the waste steam dehydrator. A drain valve is installed on the exhaust pipe. Opening the drain valve can drain the condensate in the waste steam dehydrator.
[0014] A dry waste steam outlet pipeline 6 is connected to the top end of the waste steam dehydrator. The dry waste steam outlet pipeline is connected to the steam heating inlet pipeline 10 of the brine heat exchanger 9. The outlet of the steam heating pipeline on the brine heat exchanger is the condensate outlet 11.
[0015] In this system, steam at 0.9 MPa and a temperature of 180 °C becomes exhaust steam with a temperature between 120 and 130 °C and a pressure of about 0.4 MPa after passing through the concentration kettle. The exhaust steam enters the concentrated brine heat exchanger after passing through the exhaust steam dehydrator, heats the normal temperature water in the concentrated brine heat exchanger to 80 to 90 °C, and then becomes condensed water and is discharged through the condensed water outlet 11. At present, the applicant can save about 500 tons of steam per month using this system, achieving obvious economic benefits.
[0016] After the embodiments of the present invention are described in detail, those skilled in the art can clearly understand that various changes and modifications can be made without departing from the scope and spirit of the above-mentioned patent application. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention all belong to the scope of the technical solution of the present invention, and the present invention is not limited to the embodiments described in the specification either.
Claims
1. Coking wastewater treatment and concentration kettle waste steam reuse system, including a plurality of concentration kettles, each of which is provided with a steam inlet pipe and a waste steam outlet pipe, characterized in that: All exhausted steam outlet pipes are connected to the exhausted steam and condensate collection pipeline, and the exhausted steam and condensate collection pipeline is connected to the exhausted steam dehydrator. A condensate outlet pipe is connected to the lower part of the exhausted steam dehydrator, and a dry exhausted steam outlet pipeline is connected to the top of the exhausted steam dehydrator. The dry exhausted steam outlet pipeline is connected to the steam heating inlet pipeline of the brine heat exchanger, and the outlet of the steam heating pipeline on the brine heat exchanger is the condensate outlet.
2. The coking wastewater treatment and concentration kettle waste steam reuse system according to claim 1, wherein: A safety valve is installed at the top of the exhausted steam dehydrator.
3. The coking wastewater treatment and concentration kettle waste steam recycling system according to claim 1, characterized in that: An emptying pipe is installed at the bottom of the exhausted steam dehydrator, and an emptying valve is installed on the emptying pipe. The condensate outlet pipe is connected to the side of the exhausted steam dehydrator near the bottom.
4. The coking wastewater treatment and concentration still waste steam reuse system according to claim 1, wherein: A vertical pipe extending upward is connected to the rear end of the condensate outlet pipe, and the vertical pipe is connected to a condensate drain pipe, on which a drain valve is installed.