Coking low-temperature waste heat comprehensive utilization system

Abstract

The utility model discloses a coking low-temperature waste heat comprehensive utilization system which comprises a bridge pipe, a gas collecting pipe and a primary cooler, an outlet of the gas collecting pipe is connected with a gas-liquid separator, a liquid outlet of the gas-liquid separator is sequentially connected with an oil remover and an ammonia water storage tank, and a heater and a refrigerating machine are arranged on the outer side of the primary cooler. A first pipeline and a second pipeline are arranged in the heater and the refrigerator respectively, a plurality of transverse pipe assemblies are arranged in the primary cooler from top to bottom, inlets of the transverse pipe assemblies are connected in parallel and then communicated with an outlet of the first pipeline, and outlets of the transverse pipe assemblies are connected in parallel and then communicated with an inlet of the first pipeline. An outlet of the ammonia water storage tank communicates with an inlet of a second pipeline, an outlet of the second pipeline communicates with the bent position of the bridge pipe through a circulating pipe, a top spraying assembly is arranged on the top in the primary cooler, and an inlet of the top spraying assembly communicates with the circulating pipe. In conclusion, the device has the advantages of being high in recycling efficiency, little in heat waste and capable of saving water resources.

Description

Technical Field

[0001] The utility model relates to the technical field of low-temperature waste heat utilization, in particular to a coking low-temperature waste heat comprehensive utilization system. Background Art

[0002] During the coal coking process, a large amount of coal gas with a temperature of 650-700°C is generated. The coal gas is drawn from the coke oven's carbonization chamber and first cooled to approximately 80°C through risers, bridge pipes, and gas headers. It is then cooled to approximately 20°C in a primary cooler before undergoing deoiling, desulfurization, and debenzenization. Currently, the cooling process within the bridge pipes and gas headers primarily involves spraying with circulating ammonia water. This staged cooling process within the primary cooler reduces the coal gas temperature from 700°C to approximately 21°C, dissipating approximately 36% of the coke oven's heat. The circulating ammonia water absorbs the majority of this heat, raising its temperature to approximately 80°C. After clarification, cooling, and tar separation, the temperature drops to approximately 75°C before being recycled and sprayed for reuse.

[0003] The above-mentioned process engineering has the following problems: First, the coal gas is cooled by medium-low temperature circulating water in the primary cooler. The circulating water absorbs the heat of the coal gas and heats up. The heated circulating water needs to be cooled in a cooling tower before being recycled. This process causes evaporation and drift loss of the cooling water, as well as heat waste, reducing energy utilization. Furthermore, because the primary cooler often uses a horizontal tube structure, tar in the coal gas easily adheres to the surface of the horizontal tube, thereby affecting the heat exchange efficiency between the cooling water and the coal gas in the horizontal tube. Second, the circulating ammonia water absorbs most of the heat dissipated by the coal gas, but the waste heat in the circulating ammonia water is rarely recovered and reused, resulting in wasted heat energy and energy loss. Even for a few companies that have installed waste heat recovery equipment for circulating ammonia water, the waste heat recovery efficiency is low. Therefore, it is necessary to develop a comprehensive utilization system for low-temperature waste heat from coking that has high recovery efficiency, minimizes heat waste, and conserves water resources. Utility Model Content

[0004] The purpose of the utility model is to provide a coking low-temperature waste heat comprehensive utilization system with high recycling efficiency, less heat waste and water resource saving.

[0005] The purpose of the present invention is achieved in this way, including a bridge pipe, an air collecting pipe and a pre-cooler, the outlet of the air collecting pipe is connected to a gas-liquid separator, the gas outlet of the gas-liquid separator is connected to the top of the pre-cooler, the liquid outlet of the gas-liquid separator is connected to a degreasing device and an ammonia storage tank in sequence, a heater and a refrigerator are provided on the outside of the pre-cooler, a first pipe and a second pipe are provided in the heater and the refrigerator respectively, a plurality of cross pipe assemblies are provided in the pre-cooler from top to bottom, the inlets of the plurality of cross pipe assemblies are connected to the outlet of the first pipe after being connected in parallel, the outlet of the plurality of cross pipe assemblies are connected to the inlet of the first pipe after being connected in parallel, the outlet of the ammonia storage tank is connected to the inlet of the second pipe, the outlet of the second pipe is connected to the bending part of the bridge pipe through a circulation pipe, a top spray assembly is provided at the top of the pre-cooler, the inlet of the top spray assembly is connected to the circulation pipe, an exhaust port and a drain port are provided at the bottom of the pre-cooler, and the drain port is connected to the degreasing device.

[0006] Furthermore, a lower spray assembly is provided in the primary cooler between every two adjacent transverse tube assemblies.

[0007] Furthermore, an air distribution hole plate is provided in the pre-cooler above each lower spray assembly, a short tube is provided at each opening on the air distribution hole plate, a water shield is provided above the short tube, the water shield and the short tube are connected by a connecting rod, and a drain pipe is provided on the side wall of the pre-cooler above the air distribution hole plate, and the lower end of the drain pipe is connected to the oil remover.

[0008] Furthermore, a filter is provided on the connecting pipeline between the outlet of the first pipeline and the inlet of the cross pipe assembly.

[0009] Furthermore, an upper jacket is provided on the outer wall of the primary cooler located outside the uppermost transverse tube assembly, and the bottom and top of the upper jacket are respectively connected to the circulation pipe.

[0010] Furthermore, a filter layer is provided on the top of the gas-liquid separator.

[0011] When the utility model is in operation, the coke oven gas generated in the coking process is introduced into the riser, and then into the bridge pipe and the gas collecting pipe in sequence, and the ammonia water is sprayed on the gas from the turning point of the bridge pipe and the gas collecting pipe to cool down the gas, and takes away some of the tar and other impurities in the gas, and then the gas and ammonia water enter the gas-liquid separator for gas-liquid separation, and the ammonia water is discharged from the liquid outlet of the gas-liquid separator into the degreasing device, and after the degreasing treatment, the tar in the ammonia water is removed, and the remaining ammonia water is sent to the ammonia water storage tank for storage, and at the same time, the gas is discharged from the top of the gas-liquid separator to the top of the pre-cooler, and then flows downward continuously, and in the process of its flow, it passes through a plurality of cross-tube assemblies in sequence, and the cooling water in the cross-tube assemblies absorbs the heat in the gas and cools the gas, while the cooling water sprays out the low-temperature During the falling process of low-temperature ammonia water, on the one hand, it contacts with the coal gas, absorbs the heat in the coal gas, and cools the coal gas; on the other hand, it flushes the surface of the cross tube in the cross tube assembly, flushes away the tar and other impurities on the surface of the cross tube, and finally is sent to the degreaser through the drain port for degreasing. The cooling water in the cross tube absorbs the heat from the coal gas and its temperature rises to obtain hot water. The hot water and ammonia water enter the heater together to provide heat for the heater, which can be used for heating residents or system needs. The hot water and ammonia water enter the refrigerator together to provide heat for the refrigerator. The ammonia water with lowered temperature returns to the bridge pipe through the circulation pipe to continue to cool the coal gas. Part of the cooled ammonia water is passed into the top spray assembly to cool the coal gas and flush impurities such as tar on the cross tube. In the present invention, the coal gas is cooled by cooling water in the primary cooler, and the cooling water absorbs the heat in the coal gas and heats up. Compared with the traditional technology of using a cooling tower to cool the cooling water, the present system uses a heater or a refrigerator to absorb the heat in the cooling water. In this process, the cooling water will not evaporate or drift, thus avoiding the waste of heat and water resources and improving the utilization rate of heat. Secondly, the present system passes the cooled ammonia water into the top spray assembly of the primary cooler. When sprayed, it can flush the surface of the horizontal tube in the horizontal tube assembly, thereby preventing impurities such as tar in the coal gas from adhering to the surface of the horizontal tube, thereby ensuring the heat exchange efficiency between the cooling water and the coal gas in the horizontal tube. In addition, during the coking process, the coal gas is initially cooled by ammonia water, and the temperature rises after the ammonia water absorbs heat. In this system, the ammonia water is passed into the heater or refrigerator, and the heater or refrigerator is used to absorb the heat in the ammonia water, thereby avoiding the waste and loss of heat in the ammonia water. In general, the low-temperature waste heat in the circulating cooling water and circulating ammonia water is absorbed and used for heating or cooling, making reasonable use of the low-temperature waste heat, and having a high recovery rate. In summary, the utility model has the advantages of high recovery efficiency, less heat waste, and water resource conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 This is a schematic structural diagram of the air hole plate 16 in the present invention;

[0014] In the figure: 1-bridge pipe, 2-gas collecting pipe, 3-primary cooler, 4-gas-liquid separator, 5-oil remover, 6-ammonia storage tank, 7-heater, 8-refrigeration machine, 9-first pipeline, 10-second pipeline, 11-cross pipe assembly, 12-circulation pipe, 13-top spray assembly, 14-drain port, 15-lower spray assembly, 16-air perforated plate, 17-short pipe, 18-water retaining cover, 19-drain pipe, 20-filter, 21-upper jacket, 22-filter layer. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements based on the present invention fall within the scope of protection of the present invention.

[0016] like Figures 1-2As shown, the utility model includes a bridge pipe 1, a gas collecting pipe 2 and a primary cooler 3. The bridge pipe 1 and the gas collecting pipe 2 are both existing technologies. Coal is coked in the coke oven, and the generated gas enters the bridge pipe 1 and the gas collecting pipe 2 through the riser. The circulating ammonia water is used to preliminarily cool the gas in the bridge pipe 1 and the gas collecting pipe 2, and to take away some of the tar and other impurities in the gas. The outlet of the gas collecting pipe 2 is connected to a gas-liquid separator 4, which is used to separate liquid and gas, that is, to separate gas and ammonia water. The gas enters the primary cooler 3, and the ammonia water The gas outlet of the gas-liquid separator 4 is connected to the top of the primary cooler 3. The liquid outlet of the gas-liquid separator 4 is connected to the oil remover 5 and the ammonia storage tank 6 in sequence. The oil remover 5 has existing technology and is used to separate impurities such as tar in the ammonia. The ammonia storage tank 6 is used to store the separated ammonia. A heater 7 and a refrigerator 8 are provided on the outside of the primary cooler 3. The heater 7 and the refrigerator 8 are both existing technology. The heater 7 is used to absorb heat in the cooling water to generate hot water and other heat media for domestic heating. The refrigerator 8 is used to The heat in the cooling water is absorbed as power for cooling. The heater 7 and the refrigerator 8 are respectively provided with a first pipe 9 and a second pipe 10. A plurality of cross-tube assemblies 11 are provided from top to bottom in the primary cooler 3. The cross-tube assemblies 11 are prior art and are used to be provided in the primary cooler 3 to absorb the heat in the coal gas and reduce the coal gas temperature to about 21°C. The inlets of the plurality of cross-tube assemblies 11 are connected in parallel to the outlet of the first pipe 9, and the outlets of the plurality of cross-tube assemblies 11 are connected in parallel to the inlet of the first pipe 9. The outlet of the ammonia storage tank 6 is connected in parallel to the inlet of the first pipe 9. The port is connected with the inlet of the second pipe 10, and the outlet of the second pipe 10 is connected with the bending part of the bridge pipe 1 through the circulation pipe 12. A top spray assembly 13 is provided on the top of the pre-cooler 3. The top spray assembly 13 is a prior art and is used to spray ammonia water evenly. The inlet of the top spray assembly 13 is connected with the circulation pipe 12. An exhaust port and a drain port 14 are provided at the bottom of the pre-cooler 3. The drain port 14 is connected with the degreaser 5. The drain port 14 is used to pass the ammonia water containing impurities such as tar in the pre-cooler 3 into the degreaser 5.

[0017] When the utility model is in operation, the coke oven gas generated in the coking process is introduced into the riser, and then into the bridge pipe 1 and the gas collecting pipe 2 in sequence. Ammonia water is sprayed on the gas from the turning point of the bridge pipe 1 and the gas collecting pipe 2 to cool the gas, and takes away some of the tar and other impurities in the gas. Then the gas and ammonia water enter the gas-liquid separator 4 for gas-liquid separation, and the ammonia water is discharged from the liquid outlet of the gas-liquid separator 4 to the degreasing device 5. After degreasing, the tar in the ammonia water is removed, and the remaining ammonia water is sent to the ammonia water storage tank 6 for storage. At the same time, the gas is discharged from the top of the gas-liquid separator 4 to the top of the primary cooler 3, and then flows downward continuously. During its flow, it passes through a plurality of cross pipe assemblies 11 in sequence. The cooling water in the cross pipe assembly 11 absorbs the heat in the gas and cools the gas, while the top spray assembly 13 sprays low During the falling process of the low-temperature ammonia water, the warm ammonia water contacts with the coal gas, absorbs the heat in the coal gas and cools the coal gas, and on the other hand, washes the surface of the cross tube in the cross tube assembly 11, washes off the tar and other impurities on the surface of the cross tube, and finally is sent to the degreaser 5 through the drain port 14 for degreasing. The cooling water in the cross tube absorbs the heat in the coal gas and its temperature rises to obtain hot water. The hot water and ammonia water enter the heater 7 together to provide heat for the heater 7 for heating residents or system needs. The hot water and ammonia water enter the refrigerator 8 together to provide heat for the refrigerator 8. The ammonia water with lowered temperature returns to the bridge pipe 1 through the circulation pipe 12 to continue to cool the coal gas. Part of the cooled ammonia water enters the top spray assembly 13 to cool the coal gas and wash away the tar and other impurities on the cross tube.

[0018] In the present invention, the coal gas is cooled by cooling water in the primary cooler 3, and the cooling water absorbs the heat in the coal gas and heats up. Compared with the traditional technology of using a cooling water tower to cool the cooling water, the present system adopts a heater 7 or a refrigerator 8 to absorb the heat in the cooling water. In this process, the cooling water will not evaporate or drift, thereby avoiding the waste of heat and water resources and improving the utilization rate of heat. Secondly, the present system passes the cooled ammonia water into the top spray assembly 13 of the primary cooler 3. When sprayed, it can flush the surface of the cross pipe in the cross pipe assembly 11, thereby preventing impurities such as tar in the coal gas from adhering to the surface of the cross pipe, thereby ensuring the heat exchange efficiency between the cooling water and the coal gas in the cross pipe. In addition, during the coking process, the coal gas is initially cooled by ammonia water, and the temperature rises after the ammonia water absorbs heat. In this system, the ammonia water is passed into the heater 7 or the refrigerator 8, and the heater 7 or the refrigerator 8 is used to absorb the heat in the ammonia water, thereby avoiding the waste and loss of heat in the ammonia water. In general, the low-temperature waste heat in the circulating cooling water and circulating ammonia water is absorbed and used for heating or cooling, which is reasonably utilized and has a high recovery rate of the low-temperature waste heat.

[0019] A lower spray assembly 15 is provided in the primary cooler 3 between each two adjacent cross-tube assemblies 11, and an air distribution hole plate 16 is provided in the primary cooler 3 above each lower spray assembly 15. A short tube 17 is provided at each opening on the air distribution hole plate 16, and a water retaining cover 18 is provided above the short tube 17. The water retaining cover 18 and the short tube 17 are connected by a connecting rod. A drain pipe 19 is provided on the side wall of the primary cooler 3 above the air distribution hole plate 16, and the lower end of the drain pipe 19 is connected to the oil remover 5. When the system is in operation, ammonia water is sprayed out from the top spray assembly 15, then falls on the topmost cross-tube assembly 11, and then falls downward on each cross-tube assembly 11 in turn. In actual use, it is found that the water sprayed from the top spray assembly 15 will be sprayed directly on the topmost cross-tube assembly 11, and the tar flushing effect on the cross-tube assembly 11 is better. However, due to the problem of uneven distribution of the sprayed ammonia water, the tar flushing effect on each cross-tube assembly 11 below is not good. In order to solve this problem, a lower spray assembly 15 is set up, so that each cross-tube assembly 11 can be better sprayed, and the tar and other impurities attached to the cross-tube can be better flushed away. At the same time, the temperature of the ammonia water sprayed on each cross-tube assembly 11 is relatively low, and it can also have a good heat exchange efficiency with the coal gas, thereby improving the coal gas cooling rate.

[0020] A filter 20 is provided on the connecting pipeline between the outlet of the first pipe 9 and the inlet of the cross-tube assembly 11. As the use time of this system increases, a certain amount of impurities such as scale will be generated in the cooling water. As these impurities accumulate, the heat exchange efficiency between the cross-tube assembly 11 and the coal gas may be affected, and the cross-tube assembly 11 may also be blocked. In order to avoid this problem, a filter 20 is provided. The filter 20 is a prior art and is used to filter impurities such as scale in the cooling water to ensure the purity of the cooling water, thereby ensuring the normal cooling treatment of the coal gas in the pre-cooler 3.

[0021] An upper jacket 21 is provided on the outer wall of the primary cooler 3, located outside the uppermost cross-tube assembly 11. The bottom and top of the upper jacket 21 are respectively connected to the circulation pipe 21. The circulating ammonia water is cooled in the heater 7 and the refrigerator 8. The cooled ammonia water is passed into the upper jacket 21, where it can absorb heat from the coal gas around the primary cooler 3, thereby increasing the cooling rate of the coal gas. The ammonia water with a slightly increased temperature returns to the circulation pipe 21 and then enters the bridge pipe 1 and the gas collecting pipe 2. During this process, although the temperature of the ammonia water in the upper jacket 21 rises to a certain extent, after it returns to the circulation pipe 21 and mixes with the ammonia water in the circulation pipe 21, the overall ammonia water temperature is slightly increased, but this will basically not affect the subsequent cooling of the coke oven gas by the ammonia water.

[0022] A filter layer 22 is provided on the top of the gas-liquid separator 4. The filter layer 22 is a prior art and is used to filter impurities such as tar contained in the coal gas, reduce the tar content in the coal gas, and reduce the tar content attached to the surface of the horizontal tube in the subsequent primary cooler 3.

Claims

1. A coking low-temperature waste heat comprehensive utilization system, comprising a bridge pipe (1), a gas collecting pipe (2) and a primary cooler (3), characterized in that The outlet of the gas collecting pipe (2) is connected to a gas-liquid separator (4), the gas outlet of the gas-liquid separator (4) is communicated with the top of the primary cooler (3), the liquid outlet of the gas-liquid separator (4) is connected to a degreaser (5) and an ammonia storage tank (6) in sequence, a heater (7) and a refrigerator (8) are provided on the outside of the primary cooler (3), a first pipe (9) and a second pipe (10) are provided in the heater (7) and the refrigerator (8), respectively, a plurality of cross pipe assemblies (11) are provided in the primary cooler (3) from top to bottom, and the inlets of the plurality of cross pipe assemblies (11) are connected in parallel to the inlet of the first cross pipe assemblies (11). The outlet of a pipe (9) is connected, the outlets of multiple cross pipe assemblies (11) are connected in parallel and connected to the inlet of the first pipe (9), the outlet of the ammonia storage tank (6) is connected to the inlet of the second pipe (10), the outlet of the second pipe (10) is connected to the bend of the bridge pipe (1) through the circulation pipe (12), a top spray assembly (13) is provided at the top of the primary cooler (3), the inlet of the top spray assembly (13) is connected to the circulation pipe (12), an exhaust port and a drain port (14) are provided at the bottom of the primary cooler (3), and the drain port (14) is connected to the degreaser (5).

2. The coking low-temperature waste heat comprehensive utilization system according to claim 1, characterized in that: A lower spray assembly (15) is provided in the primary cooler (3) between each two adjacent transverse tube assemblies (11).

3. The coking low-temperature waste heat comprehensive utilization system according to claim 2, characterized in that: An air distribution plate (16) is provided in the primary cooler (3) above each lower spray assembly (15), a short tube (17) is provided at each opening of the air distribution plate (16), a water shield (18) is provided above the short tube (17), and the water shield (18) and the short tube (17) are connected by a connecting rod. A drain pipe (19) is provided on the side wall of the primary cooler (3) above the air distribution plate (16), and the lower end of the drain pipe (19) is connected to the degreaser (5).

4. The coking low-temperature waste heat comprehensive utilization system according to claim 1 is characterized in that: A filter (20) is provided on the connecting pipeline between the outlet of the first pipeline (9) and the inlet of the cross pipe assembly (11).

5. The coking low-temperature waste heat comprehensive utilization system according to claim 1 is characterized in that: An upper jacket (21) is provided on the outer wall of the primary cooler (3) located outside the uppermost transverse tube assembly (11), and the bottom and top of the upper jacket (21) are respectively connected to the circulation pipe (12).

6. The coking low-temperature waste heat comprehensive utilization system according to claim 1, characterized in that: A filter layer (22) is provided on the top of the gas-liquid separator (4).

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