Coke oven gas primary cooler waste heat recycling system

Abstract

The utility model discloses a coke oven gas primary cooler waste heat recycling system which comprises a primary cooler, a heating system and a hot water refrigerating machine, a waste heat recycling section, a circulating water section and a low-temperature water section are sequentially arranged in the primary cooler from top to bottom, and a water outlet of the circulating water section is communicated with a water inlet of the waste heat recycling section. A water outlet of the waste heat recovery section is communicated with a heating system through a hot water pipe, a water inlet of the circulating water section is communicated with the heating system through a cold water pipe, the hot water pipe is communicated with a hot water refrigerator, a recooler is arranged on the cold water pipe, and the cold water pipe at a water inlet of the recooler is communicated with the hot water refrigerator through a pipeline. A water outlet and a water inlet of the low-temperature water section are communicated with the hot water refrigerator through a warm water pipe and a cold water pipe respectively, the warm water pipe is communicated with a warm water outlet of the recooler, a cold water tank is arranged on the cold water pipe, and a water outlet of the cold water tank is communicated with a cold water inlet of the recooler. In conclusion, the waste heat recovery system has the advantages of being small in energy loss, high in waste heat recovery rate and high in water resource utilization rate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a primary cooler waste heat recycling technical field, concretely relates to a coke oven gas primary cooler waste heat recycling system. BACKGROUND

[0002] In the conventional coke oven of coking industry, the coke oven raw gas temperature is generally 650~750 DEG C, in order to prevent the cracking of chemical products in the raw gas, it is beneficial to recover the chemical products in the raw gas, reduce the plugging and corrosion of recovery process pipeline and equipment, reduce the load and energy consumption of the air blower, and safely and reasonably transport the raw gas, and the raw gas finally needs to be cooled to about 21 DEG C, and the current cooling process mainly uses circulating ammonia water to spray in the bridge pipe and the gas collecting pipe, to reduce the temperature of the gas to about 80~85 DEG C, and then the gas enters the primary cooler for cooling.

[0003] The existing primary cooler generally adopts a horizontal pipe indirect primary cooler, which is divided into upper, middle and lower sections for cooling, wherein the upper and middle sections are cooled by medium-temperature circulating water, and the lower section is cooled by low-temperature water, the temperature of the circulating water outlet of the upper section of the primary cooler can be as high as 75~80 DEG C, and in winter, some enterprises directly use the circulating water of the upper section of the primary cooler for heating, thereby recovering part of the waste heat of the coke oven raw gas, and the circulating water of the middle and lower sections of the primary cooler is mainly cooled by a cooling tower and a refrigerating unit, so that the medium and low grade heat contained in the raw gas cannot be fully utilized, resulting in a large amount of energy loss, and meanwhile, the cooling tower has evaporation loss and drift loss of cooling water. UTILITY MODEL CONTENTS

[0004] The utility model discloses a coke oven gas primary cooler waste heat recycling system with less energy loss, high waste heat recovery rate and high water resource utilization rate.

[0005] The utility model discloses a coke oven gas primary cooler waste heat recycling system with less energy loss, high waste heat recovery rate and high water resource utilization rate.

[0006] Further, a cyclone sand remover is arranged on the cold water pipe between the water inlet of the circulating water section and the recolder and on the cool water pipe between the water inlet of the low temperature water section and the cool water tank.

[0007] Further, a jacket is arranged on the outer wall of the primary cooler, the circulating ammonia water inlet at the top of the jacket is communicated with the circulating ammonia water main pipe of the coking system, the circulating ammonia water outlet at the bottom of the jacket is communicated with the hot water refrigerator, the circulating ammonia water outlet of the hot water refrigerator is communicated with the circulating ammonia water main pipe of the coking system.

[0008] Further, a circulating ammonia water spray head is arranged at the top of the primary cooler, and a circulating ammonia water outlet is arranged at the bottom of the primary cooler.

[0009] Further, the circulating ammonia water spray head is communicated with the circulating ammonia water main pipe of the coking system, the circulating ammonia water outlet at the bottom of the primary cooler is connected with an oil-water separator, the water outlet of the oil-water separator is connected with a heat exchanger, the cool water inlet of the heat exchanger is communicated with the cool water tank, the hot water outlet of the heat exchanger is communicated with the hot water inlet of the hot water refrigerator, and the circulating ammonia water outlet of the heat exchanger is communicated with the circulating ammonia water main pipe of the coking system.

[0010] Further, a hot water mixing tank is arranged on the pipeline between the hot water pipe and the hot water refrigerator, and the hot water outlet of the heat exchanger and the hot water pipe are respectively communicated with the hot water mixing tank through pipelines.

[0011] The utility model discloses a coke oven gas from the top of primary cooler enters among, passes through waste heat recovery section, circulating water section and low temperature water section in proper order, utilize the cooling water in waste heat recovery section, circulating water section and low temperature water section and absorb the waste heat in coke oven gas, wherein, the utility model discloses a waste heat recovery section and circulating water section are connected in series into integral structure, and the medium temperature circulating water passes through circulating water section and waste heat recovery section in proper order and forms the hot water of temperature not less than 70 DEG C, wherein a part of hot water enters heating system and carries out heating, another part of hot water enters hot water refrigerator and carries out refrigeration, and the proportion of two hot water can be set according to the heating demand of winter and summer and the corresponding process requirement, adjusts just using the corresponding gate valve, and the temperature of cold water after falling enters the re-cooler, and the temperature of cold water is reduced again, and the temperature difference between cold water and coke oven gas is increased, and the heat exchange efficiency is improved, simultaneously, low temperature water enters low temperature water section, and the residual waste heat in coke oven gas is absorbed using low temperature water, reaches the purpose of absorbing the waste heat of coke oven gas, and the low temperature water of temperature rising is sent into hot water refrigerator, and the energy is provided using hot water and is handled to reduce the temperature, and the cool water of temperature is obtained, a part of cool water is passed into the re-cooler, and the temperature of the hot water of heating system is reduced further, and another part of cool water returns to low temperature water section and is recycled, and finally is passed into hot water refrigerator again and is recycled constantly. In the utility model, adopt the structure that waste heat recovery section and circulating water section are connected in series, and utilize heating system to heat, utilize hot water refrigerator to refrigerate the water of low temperature water section, to absorb the waste heat in coke oven gas fully, and in the waste heat utilization process, adopt the re-cooler to the water of heating system and hot water refrigerator further and handle to reduce the temperature, further reduce the temperature of water, increase the temperature difference between cold water and coke oven gas, improve the heat exchange efficiency, reduce energy loss, and secondly, compared with the traditional mode that cooling tower is used to cool hot water, the water in the utility model is in the relatively sealed circulating system, and is recycled constantly, reduces the probability of evaporation loss and drift loss, can improve the utilization rate of water resources greatly, reduces the water cost. In conclusion, the utility model has the advantages of less energy loss, high waste heat recovery rate and high water resource utilization rate. BRIEF DESCRIPTION OF DRAWINGS

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

[0013] In the drawing: 1-primary cooler, 2-heating system, 3-hot water refrigerator, 4-waste heat recovery section, 5-circulating water section, 6-low temperature water section, 7-hot water pipe, 8-cold water pipe, 9-re-cooler, 10-hot water pipe, 11-cool water pipe, 12-cool water tank, 13-cyclone sand separator, 14-jacket, 15-coking system circulating ammonia water main pipe, 16-circulating ammonia water nozzle, 17-oil-water separator, 18-heat exchanger, 19-hot water mixing tank. DETAILED DESCRIPTION

[0014] The utility model makes further illustration in combination with the drawings, but does not limit the utility model in any way, and any change or improvement based on the utility model belongs to the protection scope of the utility model.

[0015] As Figure 1 The utility model discloses a primary cooler 1, heating system 2 and hot water refrigerator 3, heating system 2 and hot water refrigerator 3 are prior art, heating system 2 is used for heating, and hot water refrigerator 3 is used for utilizing heat to carry out refrigeration, and the primary cooler 1 is sequentially provided with waste heat recovery section 4, circulating water section 5 and low temperature water section 6 from top to bottom, and the water outlet of circulating water section 5 is communicated with the water inlet of waste heat recovery section 4, and the water outlet of waste heat recovery section 4 is communicated with heating system 2 through hot water pipe 7, and the water inlet of circulating water section 5 is communicated with heating system 2 through cold water pipe 8, and hot water pipe 7 is communicated with hot water refrigerator 3 through pipeline, and cold water pipe 8 is provided with re-cooler 9, and the cold water pipe 8 of re-cooler 9 water inlet is communicated with hot water refrigerator 3 through pipeline, and the water outlet and water inlet of low temperature water section 6 are communicated with hot water refrigerator 3 through warm water pipe 10 and cool water pipe 11 respectively, and warm water pipe 10 is communicated with the warm water outlet of re-cooler 9, and cool water pipe 11 is provided with cool water tank 12, and the water outlet of cool water tank 12 is communicated with the cool water inlet of re-cooler 9 through pipeline.

[0016] The utility model runs, and the coke oven gas enters primary cooler 1 from the top, passes through waste heat recovery section 4, circulating water section 5 and low temperature water section 6 in proper order, utilizes the cooling water in waste heat recovery section 4, circulating water section 5 and low temperature water section 6 to absorb the waste heat in the coke oven gas, wherein, in the utility model, waste heat recovery section 4 and circulating water section 5 are connected in series and form an integrated structure, and the medium temperature circulating water passes through circulating water section 5 and waste heat recovery section 4 in proper order to form hot water with temperature not less than 70 DEG C, wherein a part of hot water enters heating system 2 to heat, and another part of hot water enters hot water refrigerator 3 to refrigerate, and the proportion of the two hot water can be set according to the heating demand of winter and summer and the corresponding process requirement, and can be adjusted by using the corresponding gate valve, and the cold water after temperature drop enters re-cooler 9 to reduce the temperature of cold water again, increase the temperature difference between cold water and coke oven gas and improve the heat exchange efficiency, simultaneously, the low temperature water enters low temperature water section 6, absorbs the residual waste heat in the coke oven gas by using the low temperature water, reaches the purpose of absorbing the waste heat of coke oven gas, and the low temperature water with temperature rising is sent into hot water refrigerator 3, utilizes the hot water to provide energy to carry out temperature reduction treatment and obtains cool water with lower temperature, a part of cool water is passed into re-cooler 9 to further reduce the temperature of the warm water discharged from heating system 2, and another part of cool water returns to low temperature water section 6 and is recycled, and finally is passed into hot water refrigerator 3 again and circulates continuously.

[0017] In the utility model, adopt the structure of series waste heat recovery section 4 and circulating water section 5, and utilize heating system 2 to heat, utilize hot water refrigerator 3 to carry out refrigeration to the water of low temperature water section 6, to fully absorb the waste heat in coke oven gas, and in the waste heat utilization process, adopt the further cooling treatment of re-cooler 9 to the water of heating system 2 and hot water refrigerator 3, further reduce water temperature, increase the temperature difference between cold water and coke oven gas, improve heat exchange efficiency, reduce energy loss, second, compared with the mode of traditional cooling tower to cool hot water, the water in the utility model is in relatively sealed circulating system, reduces the probability of evaporation loss and floating water loss while continuously recycling, can greatly improve the utilization rate of water resources, reduces water cost.

[0018] The cold water pipe 8 between the water inlet of circulating water section 5 and re-cooler 9 and the cool water pipe 11 between the water inlet of low temperature water section 6 and cool water tank 12 are all provided with cyclone sand remover 13, the cyclone sand remover 13 is prior art equipment, is used to remove scale and other impurities in cooling water, prevents scale and other impurities from blocking the pipeline, ensures the normality of the pipeline, and improves the heat exchange efficiency of cooling water and coke oven gas.

[0019] The outer wall of primary cooler 1 is provided with jacket 14, the circulating ammonia water inlet at the top of jacket 14 is communicated with coking system circulating ammonia water main pipe 15, the circulating ammonia water outlet at the bottom of jacket 14 is communicated with hot water refrigerator 3, and the circulating ammonia water outlet of hot water refrigerator 3 is communicated with coking system circulating ammonia water main pipe 15.Partial circulating ammonia water in coking system circulating ammonia water main pipe 15 is sent into jacket 14, the heat emitted from the side wall of primary cooler 1 by coke oven gas is absorbed by circulating ammonia water, the loss of coke oven gas waste heat is reduced, and the circulating ammonia water with temperature is sent into hot water refrigerator 3 to provide energy, and the waste heat resources are fully utilized.

[0020] The top of the primary cooler 1 is provided with a circulating ammonia water spray head 16, and the bottom is provided with a circulating ammonia water outlet. The circulating ammonia water spray head 16 is communicated with a coking system circulating ammonia water main pipe 15, the circulating ammonia water outlet at the bottom of the primary cooler 1 is connected with an oil-water separator 17, the water outlet of the oil-water separator 17 is connected with a heat exchanger 18, the cold water inlet of the heat exchanger 18 is communicated with a cold water tank 12, the hot water outlet of the heat exchanger 18 is communicated with the hot water inlet of a hot water refrigerator 3, and the circulating ammonia water outlet of the heat exchanger 18 is communicated with the coking system circulating ammonia water main pipe 15. The coking system circulating ammonia water main pipe 15 is an existing pipeline in the coking system, which is used for sending circulating ammonia water into a gas collecting pipe to cool coke oven gas. In the utility model, part of the circulating ammonia water is sent into the circulating ammonia water spray head 16, which absorbs the coke oven gas waste heat in the primary cooler 1 on the one hand, and cleans the heat exchange pipes of the waste heat recovery section 4, the circulating water section 5 and the low-temperature water section 6 on the other hand, so that the coke and other impurities adhered to the outer wall of the heat exchange pipes are washed away in time, the heat exchange efficiency is ensured, the oil-water separator 17 is used for removing coke in the circulating ammonia water, the heat exchanger 18 uses the cold water discharged from the cold water tank 12 to reduce the temperature of the circulating ammonia water, the circulating ammonia water is recycled, the produced hot water is sent into the hot water refrigerator 3 to utilize heat and produce cold water, and the cooled circulating ammonia water is returned to the coking system circulating ammonia water main pipe 15 for recycling.

[0021] A hot water mixing tank 19 is arranged on the pipeline between the hot water pipe 7 and the hot water refrigerator 3, and the hot water outlet of the heat exchanger 18 is communicated with the hot water mixing tank 19 through a pipeline. The hot water sent into the hot water mixing tank 19 has two streams, one stream is the hot water discharged from the waste heat recovery section 4, and the other stream is the hot water discharged from the heat exchanger 18. In actual operation, the temperatures of the two streams of hot water are different, and after being sent into the hot water refrigerator 3, the working efficiency may be unstable. In order to avoid this problem, the hot water mixing tank 19 is arranged, the two streams of hot water are sent into the hot water mixing tank 19 at the same time, mixed, the average hot water temperature is ensured, and the working efficiency after being sent into the hot water mixing tank 19 is stable.

Claims

1. A coke oven gas primary cooler waste heat recovery and utilization system, comprising a primary cooler (1), a heating system (2) and a hot water refrigerator (3), wherein a waste heat recovery section (4), a circulating water section (5) and a low temperature water section (6) are sequentially arranged from top to bottom in the primary cooler (1), characterized in that The outlet of the circulating water section (5) is communicated with the inlet of the waste heat recovery section (4), the outlet of the waste heat recovery section (4) is communicated with the heating system (2) through a hot water pipe (7), the inlet of the circulating water section (5) is communicated with the heating system (2) through a cold water pipe (8), the hot water pipe (7) is communicated with the hot water refrigerator (3) through a pipeline, a re-cooler (9) is arranged on the cold water pipe (8) of the inlet of the re-cooler (9), the cold water pipe (8) of the re-cooler (9) is communicated with the hot water refrigerator (3) through a pipeline, the outlet and the inlet of the low-temperature water section (6) are communicated with the hot water refrigerator (3) through a warm water pipe (10) and a cool water pipe (11) respectively, the warm water pipe (10) is communicated with the warm water outlet of the re-cooler (9), and the cool water pipe (11) is arranged with a cool water tank (12), the outlet of the cool water tank (12) is communicated with the cool water inlet of the re-cooler (9) through a pipeline.

2. The system for recovering and utilizing waste heat of a coke oven gas primary cooler according to claim 1, characterized in that: A cyclone sand remover (13) is arranged on the cold water pipe (8) between the inlet of the circulating water section (5) and the re-cooler (9) and on the cool water pipe (11) between the inlet of the low-temperature water section (6) and the cool water tank (12).

3. The system for recovering and utilizing waste heat of a coke oven gas primary cooler according to claim 1, characterized in that: A jacket (14) is arranged on the outer wall of the primary cooler (1), the circulating ammonia water inlet at the top of the jacket (14) is communicated with a circulating ammonia water main pipe (15) of a coking system, the circulating ammonia water outlet at the bottom of the jacket (14) is communicated with the hot water refrigerator (3), and the circulating ammonia water outlet of the hot water refrigerator (3) is communicated with the circulating ammonia water main pipe (15) of the coking system.

4. The system for recovering and utilizing waste heat of a coke oven gas primary cooler according to claim 1, characterized in that: A circulating ammonia water nozzle (16) is arranged at the top in the primary cooler (1), and a circulating ammonia water outlet is arranged at the bottom.

5. The system for recovering and utilizing waste heat of a coke oven gas primary cooler according to claim 4, characterized in that: The circulating ammonia water nozzle (16) is communicated with the circulating ammonia water main pipe (15) of the coking system, an oil-water separator (17) is connected to the circulating ammonia water outlet at the bottom of the primary cooler (1), a heat exchanger (18) is connected to the water outlet of the oil-water separator (17), the cool water inlet of the heat exchanger (18) is communicated with the cool water tank (12), the hot water outlet of the heat exchanger (18) is communicated with the hot water inlet of the hot water refrigerator (3), and the circulating ammonia water outlet of the heat exchanger (18) is communicated with the circulating ammonia water main pipe (15) of the coking system.

6. The system for recovering and utilizing waste heat of a coke oven gas primary cooler according to claim 5, characterized in that: A hot water mixing tank (19) is arranged on the pipeline between the hot water pipe (7) and the hot water refrigerator (3), and the hot water outlet of the heat exchanger (18) is communicated with the hot water mixing tank (19) through a pipeline.

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