Waste heat recovery device for raw coke oven gas downstream of a riser tube, and waste heat recovery method therefor

Abstract

A waste heat recovery device for raw coke oven gas downstream of a riser tube (1), and a waste heat recovery method therefor. The waste heat recovery device comprises a bridge pipe (17) used for connection to the riser tube (1), a first coal tar spray head (4) arranged in the bridge pipe (17) for coal tar spraying, and a high-temperature gas collecting pipe (7) connected to an outlet end of the bridge pipe (17), a heavy oil tank (8), a high-temperature oil pump (9), and a heat exchange device, which are arranged in order. The high-temperature gas collecting pipe (7) is arranged below the bridge pipe (17) such that coal tar sprayed from the first coal tar spray head (4) can go downward and enter the high-temperature gas collecting pipe (7), and the heavy oil tank (8) is connected to an oil outlet of the high-temperature gas collecting pipe (7). Thus, the coal tar is sprayed into the bridge pipe (17) by means of the first coal tar spray head (4), so that after heat exchange with the raw coke oven gas, the sprayed coal tar passes through the high-temperature gas collecting pipe (7), the heavy oil tank (8), and the high-temperature oil pump (9) and then enters the heat exchange device for heat recovery.

Description

Rising pipe subsequent waste heat recovery equipment of raw coal gas and waste heat recovery method thereof TECHNICAL FIELD

[0001] The present application relates to the chemical industry, energy saving and environmental protection technical field, especially to a rising pipe subsequent waste heat recovery equipment of raw coal gas and process. BACKGROUND

[0002] In the production process of coke oven, a large amount of raw coal gas is produced, which contains organic compounds such as tar, benzene, naphthalene, etc. The temperature of raw coal gas is 650-750 DEG C. At present, the main method of recovering heat energy is to change the ordinary rising pipe into a rising pipe heat exchanger. Usually, the raw coal gas is reduced to 500 DEG C to recover part of the heat energy. If the temperature of raw coal gas continues to drop, the tar will condense and block the rising pipe. Therefore, the recovery efficiency of the current rising pipe waste heat utilization project is only 30%-35%. Ammonia water is sprayed at the rising pipe subsequent bridge pipe, ammonia water is evaporated, absorbs the heat energy of raw coal gas, and the temperature of raw coal gas is reduced to 85 DEG C. Ammonia water changes into steam and enters raw coal gas. Raw coal gas enters the primary cooler, and the circulating cooling water in the primary cooler reduces the temperature of raw coal gas to 25 DEG C, and the moisture in the raw coal gas is condensed and discharged. The primary cooler uses circulating cooling water, which needs to be cooled by the cooling water tower fan to reduce the temperature, consume electricity and increase the cost of electricity.

[0003] Spraying ammonia water has negative effects in the actual production of coking. Because ammonia water is recycled, the concentration of ammonium salt in ammonia water is continuously accumulated. The tar and ammonia water are mixed together in the gas collector, and under the action of coal powder and coke powder, a tar water emulsion is formed, and salt also enters the tar. When subsequent tar distillation is carried out to extract various valuable oil products, demulsification is required first, then tar and ammonia water are separated, then sodium carbonate is added to separate ammonia, and sodium chloride is also introduced into the tar. The amount of sodium carbonate needs to be controlled to prevent salt from being too high. The rising pipe subsequent ammonia water spraying process not only wastes the heat energy of raw coal gas, but also causes a part of salt to enter the tar, which reduces the quality of the tar. At present, coking enterprises generally hope to update the process, recover the heat energy below 500 DEG C of raw coal gas, and reduce the use of ammonia water.

[0004] Patent technology of Qingdao University of Science and Technology, "Washing rectification-based raw coal gas heat recovery system and method", application publication number CN 105779027 A, inventors Chen Guanghui, Wang Weiwu. Qingdao University of Science and Technology proposes a washing distillation column process, which uses a distillation column equipment with a height of 20 meters to distill and separate light components in different height trays, and recovers the heat energy of raw coal gas. The tar component is more, so the distillation column height is 20 meters high, and cannot be reduced. Chen Guanghui and Wang Weiwu communicate with the author of this article, and under the leadership of the author of this article, they enter the coking plant for on-site investigation. When investigating the top of the coke oven, it is found that the Qingdao University of Science and Technology patent technology equipment - the washing distillation column is 20 meters high, the equipment is super high, and the distillation column cannot be connected and installed with the existing equipment of the coke oven, including the riser and the gas collector. The patent technology of Qingdao University of Science and Technology can only stay at the theoretical level and cannot be applied to the actual application of the coke oven. In summary, the coking plant needs to reduce costs and improve energy utilization efficiency, and intends to further recover the heat energy below 500℃ of raw coal gas behind the riser. When the raw coal gas is reduced to below 380℃, a large amount of tar will be condensed and precipitated, preventing the tar from accumulating on the inner surface of the steel pipe. The new equipment also needs to solve this problem. SUMMARY

[0005] The present application aims to provide a riser subsequent raw coal gas waste heat recovery equipment and a waste heat recovery method thereof, which realizes the heat recovery of the raw coal gas behind the riser through coal tar spraying and recovery, and improves the heat recovery rate.

[0006] To achieve the above-mentioned purpose, the present application provides a riser subsequent raw coal gas waste heat recovery equipment, which comprises a bridge pipe connected to the riser, a first coal tar spraying head arranged in the bridge pipe to spray coal tar, a high-temperature gas collector connected to the outlet end of the bridge pipe in sequence, a heavy oil tank, a high-temperature oil pump and a heat exchange device; wherein the high-temperature gas collector is arranged below the bridge pipe, so that the coal tar sprayed by the first coal tar spraying head can enter the high-temperature gas collector downward, the heavy oil tank is connected to the oil outlet of the high-temperature gas collector, and the high-temperature oil pump is used to transport the coal tar in the heavy oil tank to the heat exchange device for waste heat recovery.

[0007] Further, the bridge pipe is a downwardly extending arc-shaped elbow pipe, and the spraying port of the first coal tar spraying head is arranged downwardly open.

[0008] Further, it further comprises a π-shaped pipe connected to the gas outlet at the top end of the high-temperature gas collector, and a second coal tar spraying head is arranged in the π-shaped pipe; the π-shaped pipe comprises a first vertical pipe, a horizontal pipe and a second vertical pipe connected in sequence, the horizontal pipe is located above the first vertical pipe and the second vertical pipe, the first vertical pipe extends upward from the top end of the high-temperature gas collector, and the second coal tar spraying head is arranged in the first vertical pipe.

[0009] Further, a heat exchanger is arranged in the second vertical pipe.

[0010] Further, a low-temperature gas collecting pipe is connected to the bottom end of the second vertical pipe, and a first oil washing spray head is arranged in the second vertical pipe, and the heat exchanger is arranged below the first oil washing spray head.

[0011] To achieve one of the above purposes, the application further provides an upcomer subsequent raw gas waste heat recovery device, which comprises a bridge pipe connected to an upcomer, a high-temperature gas collecting pipe connected to the outlet end of the bridge pipe, a π-shaped pipe connected to the gas outlet at the top end of the high-temperature gas collecting pipe, a low-temperature gas collecting pipe connected to the outlet end of the π-shaped pipe, a heavy oil tank connected to the lower end of the high-temperature gas collecting pipe, a high-temperature oil pump, and a heat exchange device; wherein the π-shaped pipe comprises a first vertical pipe, a horizontal pipe, and a second vertical pipe connected in sequence, the first vertical pipe extends upward from the top end of the high-temperature gas collecting pipe, and a coal tar spray head is arranged in the first vertical pipe, and the high-temperature oil pump is used to transport the coal tar sprayed from the coal tar spray head to the heat exchange device through the high-temperature gas collecting pipe and the heavy oil tank for waste heat recovery.

[0012] Further, a heat exchanger is arranged in the second vertical pipe.

[0013] Further, the bottom end of the second vertical pipe is connected to the top end of the low-temperature gas collecting pipe, the upcomer subsequent raw gas waste heat recovery device further comprises a first oil washing spray head arranged in the second vertical pipe, and the heat exchanger is arranged below the first oil washing spray head.

[0014] Further, a plurality of second oil washing spray heads are arranged at the top of the low-temperature gas collecting pipe, the low-temperature gas collecting pipe is made of stainless steel, and the outer surface is insulated by aluminum silicate fiber.

[0015] Further, the bridge pipe is an arc-shaped elbow pipe extending downward, the high-temperature gas collecting pipe is arranged below the bridge pipe, and a coal tar spray head for spraying coal tar is arranged in the bridge pipe, so that the coal tar sprayed by the coal tar spray head can enter the high-temperature gas collecting pipe downward, the coal tar spray head is referred to as a first coal tar spray head, and the coal tar spray head in the first vertical pipe is referred to as a second coal tar spray head.

[0016] Further, a high-temperature valve and a steam jet head are arranged in the bridge pipe, the high-temperature valve is arranged close to the inlet end of the bridge pipe to connect or disconnect the upcomer and the bridge pipe, and the steam jet head is arranged between the high-temperature valve and the first coal tar spray head.

[0017] Further, the π-shaped pipe is a composite steel pipe, the inner surface is a non-stick coating, the outer part of the π-shaped pipe is a thermal insulation layer, the non-stick coating is a ceramic non-stick coating, and the outer thermal insulation layer is an aerogel thermal insulation layer.

[0018] Further, the high-temperature gas collecting pipe adopts a double-layer steel pipe structure, the inner layer steel pipe of the high-temperature gas collecting pipe is made of 304, 316, 309 or 310S material, and the outer layer steel pipe of the high-temperature gas collecting pipe is made of carbon steel or stainless steel material.

[0019] Further, the inner layer steel pipe and the outer layer steel pipe of the double-layer steel pipe structure are supported by a steel structure, and the inner layer steel pipe and the outer layer steel pipe are filled with an aluminum silicate ceramic fiber blanket.

[0020] Further, the oil outlet of the high-temperature gas collecting pipe is arranged at the lower end of the high-temperature gas collecting pipe, the heavy oil tank adopts a double-layer structure, the inner layer structure of the heavy oil tank is made of 304, 316, 309 or 310S material, and the outer layer structure of the heavy oil tank is made of carbon steel or stainless steel material.

[0021] Further, the inner layer structure and the outer layer structure of the heavy oil tank are supported by a steel structure, and the inner layer structure and the outer layer structure are filled with a thermal insulation material, and the thermal insulation material is an aluminum silicate ceramic fiber blanket.

[0022] Further, the heat exchange device is a heat exchange boiler, and the outlet of the high-temperature oil pump is connected to the inlet of the heat exchange boiler through a high-temperature oil pipeline.

[0023] Further, it further comprises a gas-liquid separator, a primary cooler, a rich oil storage tank, a rich oil pump, a rich oil heater and a distillation tower; the inlet of the gas-liquid separator is connected to the outlet of the low-temperature gas collecting pipe, the upper end outlet of the gas-liquid separator is connected to the primary cooler upwardly; the bottom end outlet of the gas-liquid separator is connected to the inlet of the rich oil storage tank, the outlet of the rich oil storage tank is connected to the inlet of the rich oil pump, the outlet of the rich oil pump is connected to the inlet of the bottom end of the rich oil heater, and the upper end outlet of the rich oil heater is connected to the distillation tower.

[0024] Further, it further comprises a tar precipitation tank connected to the bottom end outlet of the heat exchange boiler and a tar storage tank connected to the tar precipitation tank.

[0025] To achieve one of the above purposes, the application further provides a waste heat recovery method using the rising pipe subsequent raw coal gas waste heat recovery equipment, which is characterized by comprising the following steps:

[0026] The coal tar is sprayed through the first coal tar spray head in the bridge pipe, so that the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery.

[0027] To achieve the above object, the application further provides a waste heat recovery method using the waste heat recovery equipment for the subsequent raw coal gas of the ascending pipe, characterized by comprising the following steps:

[0028] The coal tar is sprayed by the first coal tar spraying head in the bridge pipe, and the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat recovery device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery.

[0029] The raw coal gas entering the high-temperature gas collecting pipe continues to enter the π-shaped pipe, exchanges heat with the coal tar sprayed by the second coal tar spraying head in the first vertical pipe, and then falls into the high-temperature gas collecting pipe, and then enters the heat recovery device through the heavy oil tank and the high-temperature oil pump for heat recovery.

[0030] To achieve the above object, the application further provides a waste heat recovery method using the waste heat recovery equipment for the subsequent raw coal gas of the ascending pipe, characterized by comprising the following steps:

[0031] The coal tar is sprayed by the first coal tar spraying head in the bridge pipe, and the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat recovery device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery.

[0032] The raw coal gas entering the high-temperature gas collecting pipe continues to enter the π-shaped pipe, exchanges heat with the coal tar sprayed by the second coal tar spraying head in the first vertical pipe, and then falls into the high-temperature gas collecting pipe, and then enters the heat recovery device through the heavy oil tank and the high-temperature oil pump for heat recovery.

[0033] The raw coal gas after the first vertical pipe continues to enter the second vertical pipe, exchanges heat with the heat exchanger in the second vertical pipe, and then exchanges heat again through the heat exchanger for heat recovery.

[0034] Further, the raw coal gas entering the bridge pipe is cooled by the first coal tar spraying head, and the temperature is reduced to below 300 DEG C; the raw coal gas is cooled by the second coal tar spraying head in the first vertical pipe of the π-shaped pipe, and the temperature is reduced to 230 DEG C; the raw coal gas continues to enter the second vertical pipe and is cooled by the heat exchanger, and the temperature is reduced to 85 DEG C.

[0035] To achieve the above object, the application further provides a waste heat recovery method using the waste heat recovery equipment for the subsequent raw coal gas of the ascending pipe, characterized by comprising the following steps:

[0036] The coal tar is sprayed by the first coal tar spraying head in the bridge pipe, and the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat recovery device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery.

[0037] To achieve one of the above purposes, the application also provides a waste heat recovery method using the subsequent coke oven gas waste heat recovery equipment of the rising pipe, characterized in that it comprises the following steps:

[0038] The coal tar is sprayed through the coal tar spray head in the first vertical pipe of the π-type pipe, so that the sprayed coal tar exchanges heat with the coke oven gas entering the first vertical pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump to recover heat;

[0039] The coke oven gas after the first vertical pipe continues to enter the second vertical pipe to exchange heat with the heat exchanger in the second vertical pipe, and then the heat is recovered again through the heat exchanger.

[0040] The application has the following advantages:

[0041] Firstly, the rising pipe of the coke oven can only reduce the coke oven gas to 500 DEG C, and the application can further recover the heat energy below 500 DEG C of the coke oven gas, reduce the load of the primary cooler, produce steam for use, and improve the economic benefits.

[0042] Secondly, the coal tar and the coke oven gas directly exchange heat through the first coal tar spray head spraying coal tar in the bridge pipe and / or the coal tar spray head spraying coal tar in the first vertical pipe 5, and the coal tar washes the coal tar steam in the coke oven gas and enters the high-temperature gas collecting pipe; the coal tar washes the coal tar separated out of the coke oven gas and flows into the high-temperature gas collecting pipe downward, and the process solves the problem of pipe blockage caused by the separation of coal tar below 500 DEG C.

[0043] Thirdly, the coal tar spraying through the first coal tar spray head in the bridge pipe and / or the coal tar spray head spraying coal tar in the first vertical pipe 5 does not spray ammonia water, and the water content of the coal tar is greatly reduced, and the quality of the coal tar is improved. In the previous process, spraying ammonia water can cause the water content of the coal tar to be 4%, and the coal tar needs to be dehydrated before distillation to extract various components. Since the water content of the coal tar is low in the process, the energy consumption of the subsequent production can be reduced.

[0044] Fourthly, in the traditional bridge pipe ammonia water spraying process, the ammonium salt accumulates in the circulating ammonia water, which causes the salt content of the coal tar to increase, and sodium carbonate needs to be added to separate ammonia during the subsequent production, and the salt is finally present in the coal tar in the form of sodium chloride. In the application, the ammonia water spraying device is cancelled, the salt content of the coal tar is low, the quality of the coal tar is further improved, the selling price of the recovered coal tar is improved, and the economic benefits are improved. BRIEF DESCRIPTION OF DRAWINGS

[0045] Fig. 1 is a structural schematic view of the subsequent coke oven gas waste heat recovery equipment of the rising pipe of the application;

[0046] Fig. 2 is a structural schematic diagram of a subsequent process of the oil-rich tank of the present application;

[0047] Wherein, 1, the riser; 2, the high temperature valve; 3, the steam nozzle; 4, the first coal tar spray head; 5, the first vertical pipe; 6, the second vertical pipe; 7, the high temperature gas collecting pipe; 8, the heavy oil tank; 9, the high temperature oil pump; 10, the high temperature oil pipeline; 11, the low temperature gas collecting pipe; 12, the second coal tar spray head; 13, the horizontal pipe; 14, the π-shaped pipe bend; 15, the spray pipe; 16, the second washing oil spray head; 17, the bridge pipe; 18, the first washing oil spray head; 19, the gas-liquid separator; 20, the primary cooler; 21, the oil-rich tank; 22, the heat exchange boiler; 23, the coal tar precipitation tank; 24, the oil-rich pump; 25, the oil-rich heater; 26, the distillation column; 61, the heat exchanger. DETAILED DESCRIPTION

[0048] In order to better explain the present application, the technical solutions and effects of the present application are described in detail in the specific embodiments below, combined with the accompanying drawings, so as to be understood.

[0049] As shown in Fig. 1 and Fig. 2, the present embodiment provides a riser subsequent raw gas waste heat recovery equipment, which comprises a bridge pipe 17, a high temperature gas collecting pipe 7, a low temperature gas collecting pipe 11, a π-shaped pipe, a first coal tar spray head 4, a second coal tar spray head 12, a heavy oil tank 8, a high temperature oil pump 9, a high temperature oil pipeline 10, a heat exchange boiler 22 and a coal tar precipitation tank 23.

[0050] One end of the bridge pipe 17 is connected with the riser 1, and the other end of the bridge pipe 17 is connected with the inlet of the high temperature gas collecting pipe 7. The bridge pipe 17 is an arc-shaped bend pipe extending downward, and the high temperature gas collecting pipe 7 is arranged below the bridge pipe 17 and is arranged horizontally to connect multiple bridge pipes 17. The first coal tar spray head 4 is arranged in the bridge pipe 17, and when the coal tar is sprayed, the sprayed coal tar can enter the high temperature gas collecting pipe 7 smoothly after heat exchange with the raw gas entering the bridge pipe 17.

[0051] The two ends of the π-shaped pipe are respectively connected with the top end of the high temperature gas collecting pipe 7 and the top end of the low temperature gas collecting pipe 11, and are arranged above the high temperature gas collecting pipe 7 and the low temperature gas collecting pipe 11. The second coal tar spray head 12 is arranged in the π-shaped pipe.

[0052] The bottom oil outlet of the high temperature gas collecting pipe 7 is connected with the inlet of the heavy oil tank 8, the outlet of the heavy oil tank 8 is connected with the inlet of the high temperature oil pump 9, the outlet of the high temperature oil pump 9 is connected with the inlet of the heat exchange boiler 22 through the high temperature oil pipeline 10, and the bottom outlet of the heat exchange boiler 22 is connected with the inlet of the coal tar precipitation tank 23. The heavy oil tank 8 is used to collect high temperature coal tar, and the high temperature oil pump 9 sends the incoming coal tar into the heat exchange boiler 22 through the high temperature oil pipeline 10 to exchange heat and generate steam, which is recycled and utilized.

[0053] After the heavy oil leaves the boiler, the temperature is reduced to 80℃, enters the tar precipitation tank 23, and uses the principle of gravity precipitation to separate the coal powder and coke powder in the heavy oil, and the remaining high-quality heavy oil enters the tar storage tank (not shown in the figure). The setting of the heavy oil tank 8 can ensure the stable flow of the inlet of the high-temperature oil pump 9. In the embodiment, the first coal tar spray head 4 and the second coal tar spray head 12 are necessarily connected with a coal tar supply source through an oil supply pipeline, which can be connected with the tar storage tank or other coal tar supply sources.

[0054] In the embodiment, the π-shaped pipe includes the first vertical pipe 5, the horizontal pipe 13 and the second vertical pipe 6 connected in sequence. The π-shaped pipe as a whole has a π-shaped structure, and the horizontal pipe 13 is located above the first vertical pipe 5 and the second vertical pipe 6, and is connected with the first vertical pipe 5 and the second vertical pipe 6 through the π-shaped pipe elbow 14 respectively.

[0055] The bottom end of the first vertical pipe 5 is connected with the top end of the high-temperature gas collecting pipe 7, and extends vertically upward from the top end of the high-temperature gas collecting pipe 7. The bottom end of the second vertical pipe 6 is connected with the top end of the low-temperature gas collecting pipe 11, and extends vertically upward from the top end of the low-temperature gas collecting pipe 11. The first vertical pipe 5 is a heavy oil spraying vertical pipe, and the second coal tar spraying head 12 is arranged at the top of the first vertical pipe 5 and has an empty tower structure. The second coal tar spraying head 12 in the first vertical pipe 5 sprays the coal tar delivered by the spraying pipe 15, and the sprayed coal tar is used for heat exchange with the raw coal gas entering the first vertical pipe 5 and also has a washing effect, so that the raw coal gas entering the first vertical pipe 5 precipitates coal tar. After the coal tar is precipitated, it is washed down into the high-temperature gas collecting pipe 7 by the sprayed coal tar, and then enters the heat exchange boiler 22 after the heavy oil tank 8 and the high-temperature oil pump 9 to exchange heat and generate steam, which is recycled and utilized.

[0056] The π-shaped pipe is a composite steel pipe, the inner surface of the π-shaped pipe is a ceramic non-stick coating to prevent coal tar from accumulating on the inner surface of the steel pipe, and the outer part of the π-shaped pipe is an aerogel high-efficiency insulation layer to prevent heat loss. The raw coal gas is cooled by the coal tar sprayed by the second coal tar spraying head 12 in the first vertical pipe 5, and a large amount of coal tar carried therein is precipitated. The coal tar sprayed by the second coal tar spraying head 12 and the condensed coal tar flow downward together, enter the high-temperature gas collecting pipe 7, mix with the coal tar, enter the heavy oil tank 8, and are extracted by the high-temperature oil pump 9, thereby solving the problems of coal tar precipitation and recovery.

[0057] The second vertical pipe 6 is a washing oil spraying heat exchange pipe, and a heat exchanger 61 is arranged in the second vertical pipe 6. The heat exchanger 61 can adopt several kinds of tubular heat exchangers such as horizontal pipe heat exchanger, coil pipe heat exchanger and vertical pipe heat exchanger, and the coil pipe heat exchanger is preferred in the embodiment. Water flows in the coil pipe heat exchanger to cool the raw coal gas and recycle the heat of the raw coal gas flowing therethrough, specifically to generate steam for output and utilization.

[0058] The top of the second vertical pipe 6 is also provided with a first oil washing spray head 18, through which the light oil carried in the raw coal gas is washed, and the light components (including, for example, naphthalene, phenol light oil components) are recovered, and the raw coal gas, the washing oil and the light components enter the low-temperature gas collecting pipe 11 together, and the low-temperature environment is conducive to the absorption of the light components.

[0059] In addition, the device also includes a gas-liquid separator 19, a primary cooler 20, a rich oil storage tank 21, a rich oil pump 24, a rich oil heater 25 and a distillation column 26; the inlet of the gas-liquid separator 19 is connected with the outlet of the low-temperature gas collecting pipe 11, the upper end outlet of the gas-liquid separator 19 is connected with the primary cooler 20 upwardly; the bottom end outlet of the gas-liquid separator 19 is connected with the inlet of the rich oil storage tank 21, the outlet of the rich oil storage tank 21 is connected with the inlet of the rich oil pump 24, the outlet of the rich oil pump 24 is connected with the inlet of the bottom end of the rich oil heater 25, and the outlet of the upper end of the rich oil heater 25 is connected with the distillation column 26.

[0060] After the raw coal gas, the washing oil and the light components enter the low-temperature gas collecting pipe 11, the rich washing oil (the washing oil after recovering the naphthalene, phenol and other light oil components is called the rich washing oil) flows below the low-temperature gas collecting pipe 11, and the raw coal gas flows above the low-temperature gas collecting pipe 11; the low-temperature gas collecting pipe 11 is made of stainless steel, and the outer surface is insulated by aluminum silicate fiber; the top of the low-temperature gas collecting pipe 11 is provided with 10 second oil washing spray heads 16, which can further spray and cool when the temperature of the raw coal gas is higher than 85℃; the temperature of the raw coal gas is further reduced to 85℃, and after being separated by the gas-liquid separator 19, enters the primary cooler 20 and is cooled to 25℃, and then is outputted for subsequent conventional processes; the 85℃ rich washing oil enters the rich oil storage tank 21 after being separated by the gas-liquid separator 19, is sent to the rich oil heater 25 by the rich oil pump 24, is heated, and then enters the distillation column 26 to distill naphthalene, phenol and light oil. The oil below the distillation column 26 is the poor washing oil, which enters the washing oil storage tank after being cooled by the heat exchanger, and then is transported back to the second vertical pipe 6 and the low-temperature gas collecting pipe for further spraying and cooling.

[0061] As a preferred embodiment, the heavy oil tank 8 adopts a double-layer structure, the inner layer structure is made of 304, 316, 309 or 310S material, has the effects of high-temperature resistance and corrosion resistance, and the preferred material of the embodiment is 316; the outer layer structure is made of carbon steel or stainless steel material, and the stainless steel material is selected in the embodiment; the inner layer structure and the outer layer structure of the double-layer structure are supported by a steel structure, and a filling insulation material such as an aluminum silicate ceramic fiber blanket is used to greatly reduce the heat loss.

[0062] The high-temperature gas collecting pipe 7 adopts a double-layer steel pipe structure, the inner layer is made of 304, 316, 309 or 310S material, has the effects of high-temperature resistance and corrosion resistance, and 310S steel is preferred in the embodiment; the outer layer can be made of carbon steel or stainless steel, and 304 stainless steel is preferred in the embodiment; the inner layer and the outer layer of the double-layer steel pipe structure are supported by a steel structure and filled with an aluminum silicate fiber blanket, so that the heat loss is greatly reduced. The traditional gas collecting pipe only has a single-layer steel plate, and the heat loss accounts for 10% of the total heat. The double-layer insulation structure is beneficial to reducing the heat loss.

[0063] The high-temperature oil pump 9 and the high-temperature oil pipeline 10 are located on the right side of the high-temperature gas collecting pipe 7. The high-temperature oil pipeline 10 is made of 316 stainless steel, and the outer surface is insulated. The insulation material is an aluminum silicate fiber blanket, and the outside of the insulation material is wrapped with an insulation skin. The insulation skin is made of aluminum skin.

[0064] In addition, the high-temperature valve 2 is arranged on the bridge pipe 17. The high-temperature valve 2 is made of heat-resistant steel. The high-temperature valve 2 can be a gate valve, a ball valve, a butterfly valve or a flap valve, and the butterfly valve is preferred in the embodiment. The high-temperature valve 2 plays a role of isolation. In the later stage of production in the carbonization chamber, when the cover of the updraft pipe 1 is opened for burning, the high-temperature valve 2 is closed to prevent air from entering the high-temperature gas collecting pipe 7 and also prevent the raw coal gas from being discharged from the high-temperature gas collecting pipe 7. When the coal is loaded, the high-temperature valve 2 is opened, and the raw coal gas enters the high-temperature gas collecting pipe 7 from the updraft pipe 1.

[0065] The steam jet head 3 is further arranged in the bridge pipe 17. The steam jet head 3 is used for high-pressure blowing during the loading of the coal to form a negative pressure and suck the raw coal gas into the high-temperature gas collecting pipe 7.

[0066] The high-temperature valve 2 is arranged close to the inlet end of the bridge pipe 17 to connect or disconnect the updraft pipe 1 and the bridge pipe 17. The steam jet head 3 is arranged between the high-temperature valve 2 and the first coal tar spraying head 4. The high-temperature gas collecting pipe 7 delivers the high-temperature coal tar to the heat exchange boiler 22 through the following connected heavy oil tank 8, high-temperature oil pump 9 and high-temperature oil pipeline 10 to produce steam.

[0067] The embodiment further discloses a process using the above device, and the process is specifically as follows.

[0068] The raw coal gas enters the bridge pipe 17 through the updraft pipe 1 of the coke oven. The first coal tar spraying head 4 in the bridge pipe 17 sprays coal tar to reduce the temperature of the raw coal gas to below 300℃, and the heavy coal tar in the raw coal gas is condensed. The raw coal gas and the coal tar all enter the high-temperature gas collecting pipe 7.

[0069] The coal tar flows under the high-temperature gas collecting pipe, and the raw coal gas flows above the high-temperature gas collecting pipe. The heavy coal tar at 300℃ flows into the heavy oil tank 8 through the pipeline under the high-temperature gas collecting pipe 7, is sent into the heat exchange boiler 22 through the high-temperature oil pump 9, steam is produced, and is output for utilization, thus forming the first subsequent waste heat recovery of the raw coal gas in the rising pipe 1. After the heat exchange of the high-temperature coal tar, the temperature is reduced to below 80℃, the coal tar enters the subsequent coal tar precipitation tank 23 to separate the coal tar residue, and the coal tar enters the coal tar storage tank;

[0070] The raw coal gas at 300℃ enters the π-shaped pipe through the upper end gas outlet of the high-temperature gas collecting pipe 7, the second coal tar spray head 12 in the first vertical pipe 5 sprays the coal tar to reduce the temperature of the raw coal gas to 230℃, and the coal tar and the raw coal gas are countercurrently heat exchanged. After the coal tar in the raw coal gas is separated out and is washed away by the sprayed coal tar, it enters the high-temperature gas collecting pipe 7 downwardly, mixes with the coal tar in the high-temperature gas collecting pipe 7, flows into the heavy oil tank 8, and is then extracted by the high-temperature oil pump 9 and sent into the heat exchange boiler 22 to produce steam, which is output for utilization, thus forming the second subsequent waste heat recovery of the raw coal gas in the rising pipe 1.

[0071] The raw coal gas continues to enter the second vertical pipe 6, the heat exchanger 61 in the second vertical pipe 6 has a plurality of heat exchange pipelines, water flows in the pipelines to recover the heat of the raw coal gas flowing through and produce steam, which is output for utilization, thus forming the third subsequent waste heat recovery of the raw coal gas in the rising pipe 1.

[0072] Further, the first washing oil spray head 18 in the second vertical pipe 6 sprays the washing oil to recover the light components, including naphthalene, phenol, light oil and other light components; the washing of the washing oil recovers the light oil attached to the surface of the heat exchange pipeline during the third heat recovery, forms rich washing oil, and enters the low-temperature gas collecting pipe 11 together, the temperature of the raw coal gas is further reduced to 85℃, the raw coal gas and the light components are separated by the gas-liquid separator 19, the raw coal gas enters the primary cooler 20 to complete cooling, and is output after being cooled to 25℃; the rich washing oil flows into the rich oil storage tank 21, enters the rich oil heater 25 through the rich oil pump 24, is heated, enters the subsequent distillation tower 26 after being heated, extracts the light components such as naphthalene, phenol and light oil, and the rich washing oil becomes poor washing oil. The poor washing oil is cooled by the heat exchanger and then returns to the first washing oil spray head 18 of the second vertical pipe 6 to continue spraying and cooling.

[0073] Application Example One: A coking enterprise with an annual output of 1.2 million tons of coke. The raw coal gas is 78,000 Nm³ / hour, and the coal gas contains tar with a content of 65-120 g / m³. The coke oven has been equipped with 120 heat exchangers of the rising pipe 1 to reduce the temperature of the raw coal gas from 750℃ to 500℃, and the subsequent raw coal gas waste heat recovery equipment of the rising pipe 1 is used for cooling.

[0074] 500℃ raw coal gas after the riser 1, into the bridge pipe 17, the first coal tar spray head 4 in the bridge pipe 17 spray coal tar, the temperature of the raw coal gas is reduced to below 280℃, while the heavy tar in the raw coal gas is condensed. Raw coal gas and coal tar into the high temperature gas collector 7, coal tar flows below the high temperature gas collector 7, raw coal gas flows above the high temperature gas collector 7.

[0075] Raw coal gas through the high temperature gas collector 7 into the first vertical pipe 5, the second coal tar spray head 12 in the first vertical pipe 5 spray coal tar, coal tar and raw coal gas countercurrent heat exchange, the temperature of the raw coal gas is reduced to 230℃. The coal tar sprayed in the bridge pipe 17 and the coal tar sprayed in the first vertical pipe 5 together, through the pipeline below the high temperature gas collector 7, into the heavy oil tank 8, through the high temperature oil pump 9, sent into the heat exchange boiler 22, produce steam, steam flow 15 tons / hour. After heat exchange, the temperature of the high temperature coal tar is reduced to below 80℃, into the tar precipitation tank 23, separate tar residue, then into the tar storage tank.

[0076] Raw coal gas continues to enter the second vertical pipe 6, through the first wash oil spray head 18 to spray wash oil, recover light components, together into the low temperature gas collector 11, the temperature of the raw coal gas is reduced to 85℃, through the gas-liquid separator 19, the raw coal gas enters the primary cooler 20, cooled to 25℃ under the action of circulating cooling water.

[0077] In addition, the second vertical pipe 6 uses a tube heat exchanger, which has multiple sets of heat exchange pipelines inside, water flows in the pipeline, recovering heat from the raw coal gas, producing steam 3 tons / hour. Due to heat recovery, light oil adheres to the surface of the multiple sets of heat exchange pipelines, and the spray of the first wash oil spray head recovers the light oil on the surface of the multiple sets of heat exchange pipelines. The 85℃ rich wash oil enters the rich oil storage tank 21, and is sent to the rich oil heater 25 by the rich oil pump 24 for heating, and then enters the distillation column 26 to distill naphthalene, phenol and light oil. The oil below the distillation column 26 is poor oil, which is returned to the π-shaped pipe for continued spraying and cooling after being cooled by the heat exchanger.

[0078] This example can recover the heat energy of raw coal gas below 500℃, reducing the load of the subsequent primary cooler 20, and producing steam for use, totaling 18 tons / hour, with an economic benefit of 2700 yuan / hour. Since the project is in production 365 days a year, the annual economic benefit is 2365.2 million yuan of steam revenue.

[0079] Application Example Two: A coking enterprise with an annual production of 204 million tons of coke. The raw coal gas flow is 132600 Nm³ / hour, and the coal gas contains tar, with a tar content of 65~120 grams / m³. The coke oven has already installed 144 riser 1 heat exchangers to reduce the raw coal gas from 750℃ to 500℃, and the subsequent raw coal gas waste heat recovery equipment is used for cooling.

[0080] 500℃ raw coal gas after the riser 1, into the bridge pipe 17, bridge pipe 17 spray coal tar, the temperature of the raw coal gas is reduced to below 300℃, while the heavy tar in the raw coal gas is condensed. Raw coal gas and tar into the high temperature gas collector 7, coal tar flows below the high temperature gas collector 7, raw coal gas flows above the high temperature gas collector 7. Raw coal gas into the first vertical pipe 5, spray coal tar, the temperature of the raw coal gas is reduced to 230℃. Bridge pipe 17 spray tar, raw coal gas into the first vertical pipe 5 spray tar, together, through the pipeline below the high temperature gas collector 7, into the heavy oil tank 8, through the high temperature oil pump 9, sent to the heat exchange boiler 22, produce steam, steam flow 25 tons / hour. High temperature tar heat exchange, the temperature is reduced to below 80℃, into the subsequent tar settling tank 23, separate tar residue, then into the tar storage tank.

[0081] Raw coal gas into the second vertical pipe 6 of π type pipe, through the first wash oil spray head 18 spray wash oil, recover light components, including naphthalene, phenol, light oil and other light components, the temperature of the raw coal gas is reduced to 85℃, into the primary cooler 20. The second vertical pipe 6 is a tube heat exchanger, inside has a plurality of heat exchange pipeline, water flows in the pipeline, recover the heat of raw coal gas, produce steam 5 tons / hour. Due to the heat recovery, light oil is attached to the surface of the pipeline, wash oil can recover the light tar on the surface of the pipeline. Wash oil is also heat exchanged with raw coal gas, after heating, into the rich oil storage tank 21, then into the subsequent chemical process, extract naphthalene, phenol, light oil and other light components. Wash oil after absorbing naphthalene oil and phenol oil, becomes rich wash oil, rich wash oil after heating by rich oil heater 25, to the distillation column 26, after recovering naphthalene, phenol and other light components, becomes poor wash oil, poor wash oil after cooling, into the wash oil storage tank (not shown in the figure), finally, the poor wash oil returns to the wash oil spray head in the second vertical pipe of π type pipe, continues to use.

[0082] The heat exchanger in the second vertical pipe 6 uses horizontal tube heat exchange pipe, water flows in the pipe to cool the coal gas, produce 3 tons / hour saturated steam, saturated steam pressure is 0.6MPa.

[0083] This example can recover the heat energy of raw coal gas below 500℃, reduce the load of the subsequent primary cooler 20, and produce steam for use, a total of 30 tons / hour, 150 yuan per ton of steam, economic benefit 4500 yuan per hour. Since the project is not stopped for 365 days, the direct economic income is 39.42 million yuan per year, which is the steam income.

[0084] In combination with the above embodiments, the application provides a rising pipe subsequent raw coal gas waste heat recovery equipment, which comprises a bridge pipe 17 connected to the rising pipe 1, a first coal tar spray head 4 arranged in the bridge pipe 17 to spray coal tar, a high-temperature gas collecting pipe 7 connected to the outlet end of the bridge pipe 17 in sequence, a heavy oil tank 8, a high-temperature oil pump 9 and a heat exchange device 22; wherein the high-temperature gas collecting pipe 7 is arranged below the bridge pipe 17, so that the coal tar sprayed by the first coal tar spray head can enter the high-temperature gas collecting pipe downwardly, the heavy oil tank 8 is connected to the oil outlet of the high-temperature gas collecting pipe 7, and the high-temperature oil pump 9 is used to deliver the coal tar in the heavy oil tank 8 to the heat exchange device 22 for waste heat recovery.

[0085] Further, the bridge pipe 17 is an arc-shaped elbow pipe extending downwardly, and the spray opening of the first coal tar spray head 4 is arranged to open downwardly, so that the sprayed coal tar can drive the raw coal gas to flow downwardly and can enter the high-temperature gas collecting pipe 7 smoothly downwardly.

[0086] Further, the equipment further comprises a π-shaped pipe connected to the top gas outlet of the high-temperature gas collecting pipe 7, and a second coal tar spray head 12 is arranged in the π-shaped pipe; the π-shaped pipe comprises a first vertical pipe 5, a horizontal pipe 13 and a second vertical pipe 6 connected in sequence, the horizontal pipe 13 is located above the first vertical pipe 5 and the second vertical pipe 6, the first vertical pipe 5 extends upwardly from the top end of the high-temperature gas collecting pipe 7, and the second coal tar spray head 12 is arranged in the first vertical pipe 5, so that the coal tar sprayed by the second coal tar spray head 12 and exchanged with the raw coal gas can enter the high-temperature gas collecting pipe 7 smoothly downwardly.

[0087] Further, the equipment further comprises a heat exchanger 61 arranged in the second vertical pipe 6. The heat exchanger 61 can further cool the raw coal gas, recover the heat of the raw coal gas flowing therethrough and generate steam for output and utilization.

[0088] Further, the equipment further comprises a low-temperature gas collecting pipe 11 connected to the bottom end of the second vertical pipe 6 and a first washing oil spray head 18 arranged in the second vertical pipe 6, and the heat exchanger 61 is located below the first washing oil spray head 18, and the first washing oil spray head 18 is arranged at the top of the second vertical pipe 6. Since the light oil contained in the raw coal gas will adhere to the surface of the heat exchange pipe when the heat exchanger 61 exchanges heat with the raw coal gas, the washing oil sprayed by the first washing oil spray head 18 can take away the light oil on the surface of the heat exchange pipe, form rich washing oil and enter the low-temperature gas collecting pipe 11 together.

[0089] The application also provides a subsequent up-tube raw coal gas waste heat recovery device, which comprises a bridge pipe 17 connected to the up-tube 1, a high-temperature gas collecting pipe 7 connected to the outlet end of the bridge pipe 17, a π-shaped pipe connected to the gas outlet at the top end of the high-temperature gas collecting pipe 7, a low-temperature gas collecting pipe 11 connected to the outlet end of the π-shaped pipe, a heavy oil tank 8, a high-temperature oil pump 9 and a heat exchange device 22 connected to the lower end of the high-temperature gas collecting pipe 7 in sequence; wherein the π-shaped pipe comprises a first vertical pipe 5, a horizontal pipe 13 and a second vertical pipe 6 connected in sequence, the first vertical pipe 5 extends upward from the top end of the high-temperature gas collecting pipe 7, and a coal tar spraying head 12 is arranged in the first vertical pipe 5, and the high-temperature oil pump 9 is used to transport the coal tar sprayed from the coal tar spraying head 12 to the heat exchange device 22 through the high-temperature gas collecting pipe 7 and the heavy oil tank 8 for waste heat recovery.

[0090] Further, a heat exchanger 61 arranged in the second vertical pipe 6 is further included. The heat exchanger 61 can further cool the raw coal gas, recover the heat of the raw coal gas flowing therethrough and generate steam for output and utilization.

[0091] Further, the bottom end of the second vertical pipe 6 is connected to the top end of the low-temperature gas collecting pipe 11, and the subsequent up-tube raw coal gas waste heat recovery device further comprises a first washing oil spraying head 18 arranged in the second vertical pipe 6, the heat exchanger 61 is located below the first washing oil spraying head 18, and the first washing oil spraying head 18 is arranged at the top of the second vertical pipe 6. Since the heat exchanger 61 exchanges heat with the raw coal gas, the light oil contained in the raw coal gas will adhere to the surface of the heat exchange pipeline, and the washing oil sprayed by the first washing oil spraying head 18 can carry away the light oil on the surface of the heat exchange pipeline to form a washing oil-rich mixture, which enters the low-temperature gas collecting pipe 11 together.

[0092] Further, a plurality of second washing oil spraying heads 16 are arranged at the top of the low-temperature gas collecting pipe 11, which can further spray and cool when the temperature of the raw coal gas is higher than 85℃, and the low-temperature gas collecting pipe 11 is made of stainless steel and is externally insulated by aluminum silicate fiber.

[0093] Further, the bridge pipe 17 is a downwardly extending arc-shaped elbow pipe, the high-temperature gas collecting pipe 7 is arranged below the bridge pipe 17, and a coal tar spraying head 4 for spraying coal tar is also arranged in the bridge pipe 17, so that the coal tar sprayed by the coal tar spraying head can enter the high-temperature gas collecting pipe 7 downwardly, and the coal tar spraying head 4 is referred to as a first coal tar spraying head, and the coal tar spraying head 12 in the first vertical pipe 5 is referred to as a second coal tar spraying head.

[0094] In the above inventions, further, a high-temperature valve 2 and a steam nozzle 3 are arranged in the bridge pipe 17. The high-temperature valve 2 is arranged near the inlet end of the bridge pipe 17 to connect or disconnect the upcomer 1 and the bridge pipe 17, so that in the later stage of the production of the carbonization chamber, when the upcomer 1 is opened and burned, the high-temperature valve 2 is closed to prevent air from entering the high-temperature gas collecting pipe 7, and also to prevent the raw gas from being discharged from the high-temperature gas collecting pipe 7; when the coal is loaded, the high-temperature valve 2 is opened, and the raw gas enters the high-temperature gas collecting pipe 7 from the upcomer 1. The steam nozzle 3 is arranged between the high-temperature valve 2 and the first coal tar spraying head 4. The steam nozzle 3 is used for high-pressure blowing when the coal is loaded, to form a negative pressure and suck the raw gas into the high-temperature gas collecting pipe 7.

[0095] Further, the π-shaped pipe is a composite steel pipe, the inner surface is a non-stick coating layer, which prevents the coal tar from accumulating on the inner surface of the steel pipe; the outer part of the π-shaped pipe is a heat preservation layer, which prevents heat loss caused by heat dissipation. The non-stick coating layer is a ceramic non-stick coating layer, and the outer heat preservation layer is an aerogel heat preservation layer.

[0096] Further, the high-temperature gas collecting pipe 7 adopts a double-layer steel pipe structure, the inner layer steel pipe of the high-temperature gas collecting pipe 7 is made of 304, 316, 309 or 310S material, which has the effects of high-temperature resistance and corrosion resistance; the outer layer steel pipe of the high-temperature gas collecting pipe is made of carbon steel or stainless steel material.

[0097] Further, the inner layer steel pipe and the outer layer steel pipe of the double-layer steel pipe structure are supported by a steel structure, and the inner layer steel pipe and the outer layer steel pipe are filled with an aluminum silicate ceramic fiber blanket, which greatly reduces heat loss.

[0098] Further, the oil outlet of the high-temperature gas collecting pipe 7 is arranged at the lower end of the high-temperature gas collecting pipe 7, so that the coal tar separated out can flow smoothly into the heavy oil tank 8. The arrangement of the heavy oil tank 8 can ensure the stable inlet flow of the high-temperature oil pump 9. The heavy oil tank 8 adopts a double-layer structure, the inner layer structure of the heavy oil tank 8 is made of 304, 316, 309 or 310S material, which has the effects of high-temperature resistance and corrosion resistance; the outer layer structure of the heavy oil tank 8 is made of carbon steel or stainless steel material.

[0099] Further, the inner layer structure and the outer layer structure of the heavy oil tank 8 are supported by a steel structure, and the inner layer structure and the outer layer structure are filled with a heat preservation material, which is an aluminum silicate ceramic fiber blanket, which greatly reduces heat loss.

[0100] Further, the heat exchange device 22 is a heat exchange boiler, the outlet of the high-temperature oil pump 9 is connected with the inlet of the heat exchange boiler 22 through the high-temperature oil pipeline 10, and then the coal tar is sent into the heat exchange boiler 22 for heat exchange to generate steam, and the steam is recycled. Of course, the heat exchange device 22 can also adopt the pipeline heat exchanger 61 in the second vertical pipe 6 in the above-mentioned embodiment, and the purpose of the present application can also be achieved.

[0101] Further, the gas-liquid separator 19, the primary cooler 20, the rich oil storage tank 21, the rich oil pump 24, the rich oil heater 25 and the distillation tower 26 are further included; the inlet of the gas-liquid separator 19 is connected with the outlet of the low-temperature gas collecting pipe 11, the upper end outlet of the gas-liquid separator 19 is connected with the primary cooler 20 upwardly, the bottom end outlet of the gas-liquid separator 19 is connected with the inlet of the rich oil storage tank 21, the outlet of the rich oil storage tank 21 is connected with the inlet of the rich oil pump 24, the outlet of the rich oil pump 24 is connected with the inlet of the bottom end of the rich oil heater 25, and the upper end outlet of the rich oil heater 25 is connected with the distillation tower 26. On one hand, the raw coal gas is separated by the gas-liquid separator 19 and then enters the primary cooler 20, and is cooled to 25 DEG C and then is output; on the other hand, the rich washing oil entering the low-temperature gas collecting pipe 11 is separated by the gas-liquid separator 19 and then enters the rich oil storage tank 21, is sent to the rich oil heater 25 by the rich oil pump 24, is heated, and then enters the distillation tower 26 to distill naphthalene, phenol and light oil.

[0102] Further, the tar precipitation tank 23 connected with the bottom end outlet of the heat exchange boiler 22 and the tar storage tank connected with the tar precipitation tank 23 are further included. The tar precipitation tank 23 separates the coal powder and coke powder in the heavy oil by the gravity precipitation principle, and the remaining high-quality heavy oil enters the tar storage tank for storage.

[0103] In addition, in order to achieve the above-mentioned purpose, the present application further provides a waste heat recovery method of the above-mentioned rising pipe subsequent raw coal gas waste heat recovery equipment, which comprises the following steps:

[0104] The coal tar is sprayed in the bridge pipe 17 by the first coal tar spraying head 4, the sprayed coal tar is heat-exchanged with the raw coal gas entering the bridge pipe, and then enters the heat exchange device 22 through the high-temperature gas collecting pipe 7, the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery, which corresponds to the first heat recovery of the above-mentioned specific embodiment.

[0105] In order to achieve the above-mentioned purpose, the present application further provides a waste heat recovery method of the above-mentioned rising pipe subsequent raw coal gas waste heat recovery equipment, which comprises the following steps:

[0106] The coal tar is sprayed in the bridge pipe 17 by the first coal tar spraying head 4, the sprayed coal tar is heat-exchanged with the raw coal gas entering the bridge pipe, and then enters the heat exchange device 22 through the high-temperature gas collecting pipe 7, the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery;

[0107] The raw coal gas entering the high-temperature gas collecting pipe 7 continues to enter the π-shaped pipe and exchanges heat with the coal tar sprayed by the second coal tar spraying head 12 in the first vertical pipe 5, and the heat-exchanged coal tar falls into the high-temperature gas collecting pipe 7, and then enters the heat-exchanging device 22 through the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery.

[0108] To achieve the above-mentioned purpose, the application further provides a waste heat recovery method using the subsequent raw coal gas waste heat recovery equipment of the rising pipe.

[0109] The coal tar is sprayed by the first coal tar spraying head 4 in the bridge pipe 17, and the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe and then enters the heat-exchanging device 22 through the high-temperature gas collecting pipe 7, the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery.

[0110] The raw coal gas entering the high-temperature gas collecting pipe 7 continues to enter the π-shaped pipe and exchanges heat with the coal tar sprayed by the second coal tar spraying head 12 in the first vertical pipe 5, and the heat-exchanged coal tar falls into the high-temperature gas collecting pipe 7, and then enters the heat-exchanging device 22 through the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery.

[0111] The raw coal gas after passing through the first vertical pipe 5 continues to enter the second vertical pipe 6 and exchanges heat with the heat exchanger 61 in the second vertical pipe 6, and then exchanges heat again through the heat exchanger 61 for heat recovery.

[0112] Further, the raw coal gas entering the bridge pipe 17 is sprayed and cooled by the first coal tar spraying head 4, and the temperature is reduced to below 300 DEG C; the temperature is reduced to 230 DEG C after being sprayed and cooled by the second coal tar spraying head 12 in the π-shaped pipe first vertical pipe 5; and the temperature is reduced to 85 DEG C after continuing to enter the second vertical pipe 6 and being cooled by the heat exchanger 61.

[0113] To achieve the above-mentioned purpose, the application further provides a waste heat recovery method using the subsequent raw coal gas waste heat recovery equipment of the rising pipe 1.

[0114] The coal tar is sprayed by the coal tar spraying head in the π-shaped pipe first vertical pipe 5, and the sprayed coal tar exchanges heat with the raw coal gas entering the π-shaped pipe and then enters the heat-exchanging device 22 through the high-temperature gas collecting pipe 7, the heavy oil tank 8 and the high-temperature oil pump 9 for heat recovery.

[0115] To achieve the above-mentioned purpose, the application further provides a waste heat recovery method using the subsequent raw coal gas waste heat recovery equipment of the rising pipe 1.

[0116] The coal tar is sprayed by a coal tar spraying head in the first vertical pipe 5 of the pi type pipe, so that the sprayed coal tar exchanges heat with the raw coal gas entering the first vertical pipe 5, and then enters the heat recovery device 22 through the high-temperature gas collecting pipe 7, the heavy oil tank 8 and the high-temperature oil pump 9 to recover heat;

[0117] The raw coal gas after the first vertical pipe 5 continues to enter the second vertical pipe 6, exchanges heat with the heat exchanger 61 in the second vertical pipe 6, and then recovers heat again through the heat exchanger 61.

[0118] Firstly, the present coke oven riser pipe can only reduce the raw coal gas to 500 DEG C, and the present application can further recover the heat energy below 500 DEG C of the raw coal gas, reduce the load of the primary cooler, produce steam for use, and improve the economic benefit.

[0119] Secondly, the coal tar and the raw coal gas directly exchange heat through the coal tar sprayed by the first coal tar spraying head 4 in the bridge pipe 17 and / or the coal tar sprayed by the coal tar spraying head in the first vertical pipe 5, the heat exchange efficiency is high, and the tar steam in the raw coal gas is washed by the coal tar and enters the high-temperature gas collecting pipe 7.

[0120] Thirdly, the coal tar sprayed by the first coal tar spraying head 4 in the bridge pipe 17 and / or the coal tar sprayed by the coal tar spraying head in the first vertical pipe 5 does not spray ammonia water, so that the water content of the coal tar is greatly reduced and the quality of the coal tar is improved.

[0121] Fourthly, in the traditional bridge pipe ammonia water spraying process, the ammonium salt in the circulating ammonia water accumulates, so that the salt content of the coal tar accumulates, sodium carbonate needs to be added to separate ammonia during subsequent production, and the salt finally exists in the coal tar in the form of sodium chloride. In the present application, the bridge pipe ammonia water spraying is cancelled, the salt content of the coal tar is low, the quality is further improved, the sales price of the coal tar is improved, and the economic benefit is improved.

Claims

1. A top gas recovery device for a subsequent up-take duct, characterized in that: The bridge pipe is downwardly extending arc-shaped elbow pipe, and the spraying port of the first coal tar spraying head is downwardly and openly arranged.

2. The riser subsequent raw gas waste heat recovery apparatus according to claim 1, characterized by, The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

3. The riser follow-up top gas waste heat recovery apparatus according to claim 1, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

4. The riser follow-up top gas waste heat recovery apparatus according to claim 3, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

5. The riser follow-up top gas waste heat recovery apparatus according to claim 4, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

6. A riser subsequent raw gas waste heat recovery apparatus, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

7. The riser follow-up top gas waste heat recovery apparatus according to claim 6, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

8. The riser follow-up top gas waste heat recovery apparatus according to claim 7, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

9. The riser follow-up top gas waste heat recovery apparatus according to claim 5 or 8, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

10. The riser follow-up top gas waste heat recovery apparatus according to claim 6, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe.

11. The riser follow-up top gas waste heat recovery apparatus according to claim 1 or 6, characterized by: The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. 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The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical pipe, a horizontal pipe and a second vertical pipe which are sequentially connected, and the horizontal pipe is located above the first vertical pipe and the second vertical pipe. The π-shaped pipe further comprises a first vertical 12. The riser follow-up top gas waste heat recovery apparatus according to claim 3 or 6, characterized by: The π-shaped pipe is a composite steel pipe, the inner surface is a non-stick coating, the outer part of the π-shaped pipe is a thermal insulation layer, the non-stick coating is a ceramic non-stick coating, and the outer thermal insulation layer is an aerogel thermal insulation layer.

13. The riser follow-up top gas waste heat recovery apparatus according to claim 1 or 6, characterized by: The high-temperature gas collecting pipe adopts a double-layer steel pipe structure, the inner layer steel pipe of the high-temperature gas collecting pipe is made of 304, 316, 309 or 310S material, and the outer layer steel pipe of the high-temperature gas collecting pipe is made of carbon steel or stainless steel material; the inner layer steel pipe and the outer layer steel pipe of the double-layer steel pipe structure are supported by a steel structure, and the inner layer steel pipe and the outer layer steel pipe are filled with an aluminum silicate ceramic fiber blanket.

14. The riser follow-up top gas waste heat recovery apparatus according to claim 1 or 6, characterized by: The oil outlet of the high-temperature gas collecting pipe is arranged at the lower end of the high-temperature gas collecting pipe, the heavy oil tank adopts a double-layer structure, the inner layer structure of the heavy oil tank is made of 304, 316, 309 or 310S material, and the outer layer structure of the heavy oil tank is made of carbon steel or stainless steel material; the inner layer structure and the outer layer structure of the heavy oil tank are supported by a steel structure, and the inner layer structure and the outer layer structure are filled with a thermal insulation material, and the thermal insulation material is an aluminum silicate ceramic fiber blanket.

15. The riser follow-up top gas waste heat recovery apparatus according to claim 1 or 6, characterized by: The heat exchange device is a heat exchange boiler, and the outlet of the high-temperature oil pump is connected with the inlet of the heat exchange boiler through a high-temperature oil pipeline.

16. The riser-sequel top gas waste heat recovery apparatus according to claim 5 or 6, characterized by: Further comprising a gas-liquid separator, a primary cooler, a rich oil storage tank, a rich oil pump, a rich oil heater and a distillation column; the inlet of the gas-liquid separator is connected with the outlet of the low-temperature gas collecting pipe, the upper end outlet of the gas-liquid separator is connected with the primary cooler upwardly; the bottom end outlet of the gas-liquid separator is connected with the inlet of the rich oil storage tank, the outlet of the rich oil storage tank is connected with the inlet of the rich oil pump, the outlet of the rich oil pump is connected with the inlet of the bottom end of the rich oil heater, and the upper end outlet of the rich oil heater is connected with the distillation column.

17. The riser-sequel top gas waste heat recovery apparatus according to claim 17, characterized by: Further comprising a tar precipitation tank connected with the bottom end outlet of the heat exchange boiler and a tar storage tank connected with the tar precipitation tank.

18. A waste heat recovery method using the waste heat recovery apparatus for a subsequent raw gas of a riser according to claim 1 or 2, characterized in that, The method comprises the following steps: The coal tar is sprayed in the bridge pipe through the first coal tar spray head, so that the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery.

19. A waste heat recovery method using the waste heat recovery apparatus for a subsequent raw gas of an ascending pipe according to claim 3, characterized in that, The method comprises the following steps: The coal tar is sprayed in the bridge pipe through the first coal tar spray head, so that the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery. The raw coal gas entering the high-temperature gas collecting pipe continues to enter the π-shaped pipe, exchanges heat with the coal tar sprayed by the second coal tar spray head in the first vertical pipe, and then falls into the high-temperature gas collecting pipe, and then enters the heat exchange device through the heavy oil tank and the high-temperature oil pump for heat recovery.

20. A waste heat recovery method using the waste heat recovery apparatus for a subsequent raw gas of a riser according to claim 4 or 5, characterized in that, The method comprises the following steps: The coal tar is sprayed in the bridge pipe through the first coal tar spray head, so that the sprayed coal tar exchanges heat with the raw coal gas entering the bridge pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump for heat recovery. The raw coal gas entering the high-temperature gas collecting pipe continues to enter the π-shaped pipe, exchanges heat with the coal tar sprayed by the second coal tar spray head in the first vertical pipe, and then falls into the high-temperature gas collecting pipe, and then enters the heat exchange device through the heavy oil tank and the high-temperature oil pump for heat recovery. The raw coal gas after the first vertical pipe continues to enter the second vertical pipe, exchanges heat with the heat exchanger in the second vertical pipe, and then again exchanges heat with the heat exchanger to recover heat.

21. The waste heat recovery method according to claim 20, characterized by, The raw coal gas entering the bridge pipe is cooled by the first coal tar spray head, and the temperature is reduced to below 300℃; after being cooled by the second coal tar spray head in the first vertical pipe of the π-shaped pipe, the temperature is reduced to 230℃; after entering the second vertical pipe and being cooled by the heat exchanger, the temperature is reduced to 85℃.

22. A waste heat recovery method using the waste heat recovery apparatus for a subsequent raw gas of a riser according to claim 6, characterized in that, The method comprises the following steps: The coal tar is sprayed by the coal tar spray head in the first vertical pipe of the π-shaped pipe, so that the sprayed coal tar exchanges heat with the raw coal gas entering the π-shaped pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump to recover heat.

23. A waste heat recovery method using a waste heat recovery apparatus according to any one of claims 7 to 8, characterized in that, The method comprises the following steps: The coal tar is sprayed by the coal tar spray head in the first vertical pipe of the π-shaped pipe, so that the sprayed coal tar exchanges heat with the raw coal gas entering the π-shaped pipe, and then enters the heat exchange device through the high-temperature gas collecting pipe, the heavy oil tank and the high-temperature oil pump to recover heat. The raw coal gas after the first vertical pipe continues to enter the second vertical pipe, exchanges heat with the heat exchanger in the second vertical pipe, and then again exchanges heat with the heat exchanger to recover heat.

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