Semi-coke dry quenching waste heat recovery system

Abstract

The utility model relates to a semi-coke dry quenching waste heat recovery system which comprises a dry quenching furnace, a high-temperature-resistant dust remover, a waste heat boiler, a cyclone dust remover and a coal economizer, and a gas outlet in the top of the dry quenching furnace is sequentially connected with the high-temperature-resistant dust remover, the waste heat boiler and the cyclone dust remover through pipelines. The cyclone dust collector is connected with a gas inlet at the bottom of the dry quenching furnace through a pipeline system, and an economizer is mounted on the pipeline system. According to the utility model, heat in the high-temperature semi-coke can be fully recovered, so that the purposes of energy conservation and consumption reduction are achieved; meanwhile, in the process, an inert gas dry quenching mode is adopted, so that the coke strength is improved, the reactivity of the coke is reduced, unorganized exhaust gas is reduced, the emission amount of carbon dioxide is reduced, the use amount of production water is reduced, and the treatment amount of phenol-cyanogen sewage is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dry quenching technology, energy -conserving and environment -friendly technical field, especially relates to a semi coke dry quenching waste heat recovery system. BACKGROUND

[0002] In industrial production, semi coke is a kind of carbon material that can replace coke (metallurgical coke) and be widely used in chemical industry, smelting, gas making and other industries. In the production process of semi coke, the product temperature of raw coal after pyrolysis in carbonization furnace is 700-850 DEG C. At present, in order to facilitate storage and transportation, the mode of water quenching or water quenching after water-cooled wall heat exchange is usually widely used, which not only causes a large amount of waste of energy and power medium, but also produces difficult-to-handle phenol cyanide wastewater and harmful gas. The moisture content of semi coke after water quenching is high, and the quality of semi coke is reduced. CONTENT

[0003] In view of the above problems, the utility model provides a semi coke dry quenching waste heat recovery system to solve the problems in the background art.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A semi coke dry quenching waste heat recovery system, including dry quenching furnace, high temperature dust collector, waste heat boiler, cyclone dust collector and coal economizer, the gas outlet of the top of dry quenching furnace is connected with high temperature dust collector, waste heat boiler and cyclone dust collector in proper order through pipeline, and the gas inlet of the bottom of dry quenching furnace is connected with cyclone dust collector through pipeline system, and coal economizer is installed on the pipeline system.

[0006] Circulating fan is also installed on the pipeline between cyclone dust collector and coal economizer.

[0007] Emergency dispersing pipe is arranged on the high temperature dust collector.

[0008] The coal economizer is connected with bypass pipe in parallel, and circulating gas dispersing pipe is arranged on the top of coal economizer.

[0009] Circulating gas supplement pipe is arranged on the outlet pipeline of coal economizer, and gas component detection system is also arranged.

[0010] The circulating gas in the recovery system is inert gas or nitrogen.

[0011] Compared with the prior art, the utility model has the advantages of:

[0012] The high-temperature coking breeze exchanges heat with inert circulating gas or nitrogen in the dry quenching furnace, the heat of the coking breeze is transferred to the inert circulating gas or nitrogen, high-temperature circulating gas is formed, the high-temperature circulating gas enters the waste heat boiler through the high-temperature circulating gas pipeline system, and the heat in the high-temperature circulating gas is converted into medium-temperature and medium-pressure steam for power generation or for use by other users, so that the waste heat of the high-temperature coking breeze is recycled. The utility model can fully recycle the heat in the high-temperature coking breeze, achieve the purpose of energy saving and consumption reduction, and simultaneously, the inert gas is used to dry quench the coking breeze, the coke strength is improved, the reactivity of the coke is reduced, the unorganized emission gas is reduced, the discharge amount of carbon dioxide is reduced, the use amount of production water is reduced, and the treatment amount of phenol cyanide sewage is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a process flow diagram of the high-temperature coking breeze dry quenching waste heat recovery system.

[0014] In the figure: 1, dry quenching furnace; 2, coking breeze buffer interface; 3, high-temperature circulating gas pipeline system; 4, high-temperature dust remover; 5, waste heat boiler; 6, cyclone dust collector; 7, circulating fan; 8, economizer; 9, low-temperature circulating gas pipeline system; 10, circulating gas inlet; 11, sealing valve; 12, emergency release pipe; 13, circulating gas release pipe; 14, nitrogen supplement pipe. DETAILED DESCRIPTION

[0015] The utility model will be further explained by the mode of embodiment below, but will not limit the utility model in the embodiment range. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without creative labor belong to the scope of the utility model protection.

[0016] See Figure 1 As shown in the figure, a coking breeze dry quenching waste heat recovery system comprises a dry quenching furnace 1, a high-temperature dust remover 4, a waste heat boiler 5, a cyclone dust collector 6 and an economizer 8, the gas outlet at the top of the dry quenching furnace 1 is connected with the high-temperature dust remover 4, the waste heat boiler 5 and the cyclone dust collector 6 in sequence through pipelines, the cyclone dust collector 6 is connected with the gas inlet at the bottom of the dry quenching furnace 1 through a pipeline system, and the economizer 8 is installed on the pipeline system.

[0017] A circulating fan 7 is also installed on the pipeline between the cyclone dust collector 6 and the economizer 8.

[0018] An emergency release pipe 12 is arranged on the high-temperature dust remover 4.

[0019] The economizer 8 is connected with a bypass pipe in parallel, and a circulating gas release pipe 13 is arranged at the top of the economizer 8.

[0020] A circulating gas supplement pipe 14 is arranged on the outlet pipe of the economizer 8, and a gas component detection system is also arranged.

[0021] A circulating gas supplement pipe 14 is arranged on the inlet pipe of the high-temperature dust collector 4.

[0022] The circulating gas in the recycling system is inert gas or nitrogen.

[0023] A production process of a semi-coke dry quenching waste heat recovery system, comprising the following processes:

[0024] 1) After being discharged from the top of the dry quenching furnace 1, the high-temperature circulating gas enters the high-temperature dust collector 4 for dust removal, and then enters the waste heat boiler 5 for heat exchange, the inlet temperature of the waste heat boiler 5 is between 550-700℃, and the outlet temperature is between 160-180℃;

[0025] 2) After being exchanged by the waste heat boiler 5, the high-temperature circulating gas becomes low-temperature circulating gas, which enters the low-temperature circulating gas pipe system 9 from the outlet of the waste heat boiler 5, passes through the cyclone dust collector 6 and the circulating fan 7, and enters the economizer 8, so that the temperature of the circulating gas is reduced to 120-140℃;

[0026] 3) The low-temperature circulating gas at 120-140℃ enters from the bottom of the dry quenching furnace 1, the bottom is provided with a circulating gas inlet 10, and the gas supply amount is adjusted according to the coke temperature and coke amount. The low-temperature circulating gas at 120-140℃ exchanges heat with the semi-coke in the dry quenching furnace 1 by convection, and then is discharged from the top of the dry quenching furnace 1, the discharge temperature is 550-750℃, and a cycle of heat exchange is completed.

[0027] The inlet temperature of the semi-coke is 700-850℃, and the outlet temperature is not higher than 200℃.

[0028] A semi-coke dry quenching waste heat recovery system, comprising: a dry quenching furnace 1, a semi-coke buffer interface 2, a high-temperature circulating gas pipe system 3, a high-temperature dust collector 4, a waste heat boiler 5, a cyclone dust collector 6, a circulating fan 7, an economizer 8, a low-temperature circulating gas pipe system 9, a circulating gas inlet 10, a sealing valve 11, an emergency release pipe 12, a circulating gas release pipe 13, and a nitrogen supplement pipe 14.

[0029] The dry quenching furnace 1 is the core equipment of the waste heat recovery system, and is located below the carbonization furnace of the semi-coke. The upper part of the dry quenching furnace 1 is provided with the semi-coke buffer interface 2 which is connected with the carbonization furnace body. The bottom of the dry quenching furnace 1 is provided with the sealing valve 11 for discharging low-temperature semi-coke, and the discharge temperature is about 180℃. At the same time, the dry quenching furnace 1 is isolated from the external environment to prevent the inert circulating gas in the dry quenching furnace 1 from leaking.

[0030] The upper part of the dry quenching furnace 1 is provided with a circulating gas outlet connected with a branch pipe of the high-temperature circulating gas pipeline system 3. The lower part of the dry quenching furnace 1 is provided with a circulating gas inlet 10 connected with a branch pipe of the low-temperature circulating gas pipeline system 9.

[0031] In some embodiments, the dry quenching furnace 1 is a square or circular vertical structure, and the inside is inlaid with wear-resistant, refractory and heat-insulating materials. The top of the furnace is provided with a sealing device to avoid the gas entering the quenching furnace and reduce the safety risk.

[0032] The circulating gas pipeline system can be arranged according to the number of dry quenching furnaces. The high-temperature circulating gas pipeline system 3 includes branch pipes, main pipes and a converging main pipe. The branch pipes are used to connect each dry quenching furnace 1, and then the main pipes are connected with the converging main pipe, and then the high-temperature circulating gas is introduced into the high-temperature dust collector 4. High-temperature valves are arranged at the connection positions of each part of the branch pipes, the main pipes and the converging main pipe to ensure that a single set of device can be independently operated and run, and to facilitate maintenance. The inside of the high-temperature circulating gas pipeline is lined with lightweight, wear-resistant and refractory castable containing anchor members. High-temperature expansion joints are arranged on the branch pipes, the main pipes and the converging main pipe.

[0033] The converging main pipe of the high-temperature circulating gas pipeline system 3 is provided with a high-temperature dust collector 4. The top of the high-temperature dust collector 4 is provided with an emergency release device. Pressure, temperature, flow and other instrument devices are arranged on the converging main pipe.

[0034] The high-temperature dust collector 4 is surrounded by a lightweight castable furnace wall with a ceramic fiber backing plate. The top of the high-temperature dust collector 4 is provided with an emergency release device 12.

[0035] The waste heat boiler 5 is a double-drum natural circulation water tube boiler producing medium-temperature and medium-pressure steam. The auxiliary equipment includes continuous and fixed discharge, superheater, deaerator, furnace ash removal device, electrical instrument system, control system, safety protection system and the like.

[0036] The cyclone dust collector 6 can be a multi-tube structure or a bag dust collector.

[0037] The economizer 8 is a steel spiral fin tube economizer, and the top of the economizer 8 is provided with a circulating gas release pipe 13. The low-temperature circulating gas pipeline at the outlet of the economizer 8 is provided with a nitrogen supplement pipe 14, and is also provided with a gas component detection system.

[0038] The low-temperature circulating gas pipeline system 3 is provided with a nitrogen supplement pipe 14, a low-temperature circulating gas component detection system and temperature, pressure, flow and other detection instruments.

[0039] The low-temperature circulating gas pipeline system 9 comprises a main pipeline, a branch pipeline and a sub-pipeline, the sub-pipeline is used for connecting each dry quenching furnace 1, and is connected to the main pipeline, and finally connected to the main pipeline through the sub-pipeline, and the main pipeline is connected to the economizer 8, and a valve is arranged at the connection of each part to ensure that a single set of device can be independently operated and run and convenient maintenance.

[0040] The circulating gas is preferably nitrogen in the embodiment of the utility model, nitrogen can reduce dry quenching system fluctuation, production stability is high, safety is good, and product quality is high.

[0041] The circulating fan 7 is a variable frequency fan.

[0042] In the embodiment of the utility model, 700-850 DEG C high temperature semi coke enters into dry quenching furnace 1 from carbonization furnace through semi coke buffer interface 2, about 130 DEG C low temperature circulating gas enters into furnace body from circulating gas inlet 10 at the bottom of dry quenching furnace 1 and carries out counter current heat exchange with high temperature semi coke, the temperature of circulating gas rises to 550-750 DEG C, and is discharged from the top and enters high temperature circulating gas pipeline system 3, high temperature circulating gas enters waste heat boiler 5 through the branch pipeline, main pipeline, converging main pipeline and high temperature dust remover of high temperature circulating gas pipeline system, the inlet temperature of boiler is 550-700 DEG C, and after heat exchange, circulating temperature drops to 160-180 DEG C and is discharged from the outlet of boiler, and waste heat boiler 5 generates medium temperature and medium pressure steam (4MPa, 250 DEG C) for power generation or other users, thereby realizing waste heat recovery and utilization of high temperature semi coke.

[0043] After being discharged from waste heat boiler 5, low temperature circulating gas enters low temperature circulating gas pipeline system 9, passes through cyclone dust collector 6 and circulating fan 7 and enters economizer 8, so that the temperature of circulating gas drops to about 120-140 DEG C from 160-180 DEG C.

[0044] In some embodiments, the economizer is provided with a bypass, the bypass flow can be adjusted according to the temperature of circulating gas, the temperature of circulating gas entering the furnace is ensured not to be too high or too low, and the temperature is about 120-140 DEG C.

[0045] Low temperature circulating gas from economizer 8 enters low temperature circulating gas pipeline system 9 and enters from the bottom of dry quenching furnace 1 through low temperature circulating gas pipeline system 9.The temperature of circulating gas entering the dry quenching furnace is about 130 DEG C and carries out counter current heat exchange with high temperature semi coke in the dry quenching furnace, is discharged from the top of the dry quenching furnace and completes a circulating heat exchange process.The semi coke after dry quenching is discharged from dry quenching furnace 1 through sealing valve 11.

[0046] In some embodiments, the nitrogen supplement pipe 14 is provided with a flow meter and an adjusting valve, the flow meter adopts an orifice flow meter or a vortex flow meter.Nitrogen is provided by an air separation device and the pressure is ensured to be stable.

[0047] The main component of the circulating gas is nitrogen, and the gas component is not limited to nitrogen, but can also be other media.

[0048] In some embodiments, the dust removal work of the high-temperature resistant dust collector 4, the waste heat boiler 5, the cyclone dust collector 6 and the like is performed by pneumatic conveying, so as to realize intelligent environmental protection operation.

[0049] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0050] In addition, it should be understood that, although the present application is described in the form of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A semi-coke dry quenching waste heat recovery system, characterized by, The dry quenching furnace, the high-temperature dust collector, the waste heat boiler, the cyclone dust collector and the coal economizer are connected in sequence by pipelines, the cyclone dust collector is connected with the bottom gas inlet of the dry quenching furnace by a pipeline system, and the coal economizer is installed on the pipeline system.

2. The semi-coke dry quenching heat recovery system according to claim 1, characterized by, A circulating fan is installed on the pipeline between the cyclone dust collector and the coal economizer.

3. The semi-coke dry quenching heat recovery system according to claim 1, characterized in that, An emergency release pipe is arranged on the high-temperature dust collector.

4. The dry quenching waste heat recovery system for semicoke according to claim 1, characterized in that, The coal economizer is connected with a bypass pipe in parallel, and a circulating gas release pipe is arranged on the top of the coal economizer.

5. The dry quenching waste heat recovery system for semicoke according to claim 1 or 4, characterized in that, A circulating gas supplement pipe is arranged on the outlet pipeline of the coal economizer, and a gas component detection system is arranged.

6. The dry quenching waste heat recovery system for semicoke according to claim 1, characterized in that, A circulating gas supplement pipe is arranged on the inlet pipeline of the high-temperature dust collector.

7. The dry quenching waste heat recovery system according to claim 1, wherein, The circulating gas in the recycling system is inert gas or nitrogen.

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