CN216192076U - Afterburning device of dry quenching system - Google Patents
Afterburning device of dry quenching system Download PDFInfo
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- CN216192076U CN216192076U CN202122960376.5U CN202122960376U CN216192076U CN 216192076 U CN216192076 U CN 216192076U CN 202122960376 U CN202122960376 U CN 202122960376U CN 216192076 U CN216192076 U CN 216192076U
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Abstract
The utility model discloses a afterburning device of a dry quenching system, which comprises an air inlet channel arranged in a dry quenching furnace and a gas fuel pipeline communicated with the dry quenching system, wherein the gas fuel pipeline is arranged in an annular flue of the dry quenching furnace, at an outlet of the annular flue of the dry quenching furnace or at any position on a pipeline between the dry quenching furnace and a dry quenching boiler. According to the utility model, the coal gas fuel is introduced into the dry quenching system through the coal gas fuel pipeline for combustion, so that the dry quenching circulating gas volume can be increased, the inlet temperature of the dry quenching boiler can be stabilized, the power generation efficiency of the dry quenching boiler can be further improved, the utilization efficiency of the dry quenching system equipment can be improved, the technical problem caused by low-load operation of coking production can be further solved, the direct investment of production equipment can be reduced, the economy is good, and the technology is reliable.
Description
Technical Field
The utility model belongs to the technical field of dry quenching waste heat power generation, and particularly relates to a supplementary firing device of a dry quenching system.
Background
The dry quenching waste heat power generation technology is a process that red coke in a dry quenching furnace is cooled in an oxygen-free environment by using low-temperature inert gas, high-temperature inert circulating gas after absorbing latent heat of the red coke is discharged from an annular flue of the dry quenching furnace and then enters a dry quenching waste heat boiler for heat exchange, and steam generated by the heat exchange enters a steam turbine to drive a generator to generate power. In the dry quenching system, the low-temperature inert gas cooled from the dry quenching waste heat boiler is blown into the dry quenching furnace again by the circulating fan, the red coke is continuously cooled, and the cooled coke is discharged from the bottom of the dry quenching furnace.
At present, the production of a coking enterprise is influenced by factors such as the overhaul of coke oven equipment, environmental protection and yield limitation, the coke oven coke yield is unstable in a short time, and the production load presents a wave-shaped change curve in the whole day. Therefore, the coke dry quenching and waste heat power generation system has load change, the efficiency of a coke dry quenching boiler and power generation equipment cannot be completely released, the efficiency deviates from the design value, and particularly coking enterprises adopting a full dry quenching mode. The red coke processing amount required by the coke oven is assumed to be 200t/h, then 2 sets of 200t/h dry quenching are adopted to realize full dry quenching, each set of dry quenching is processed for 100t/h in normal operation, the load rate is 50%, the dry quenching utilization rate of a single set is basically operated at the load of 50% or below, and low-load operation can cause a series of production technical problems of dust deposition of a dry quenching system, reduction of equipment heat exchange efficiency, deviation of dry quenching production technical parameters, reduction of power generation efficiency, long-term low-efficiency interval of auxiliary equipment such as dust removal, water pumps and the like. Few enterprises adopt a plurality of sets of dry quenching equipment with small design processing capacity to improve the load factor of a single set of dry quenching equipment during normal production, such as: the red coke treatment capacity required by the coke oven is 200t/h, and then 3 sets of dry quenching at 110t/h are adopted to realize full dry quenching, each set of dry quenching treatment is about 66.7t/h in normal operation, the load rate is about 60 percent, the system configuration has high investment once, and the technical and economic feasibility is poor.
In the prior art, for promoting the generating efficiency of dry quenching system, utility model patent with publication number CN106989611A discloses a coke oven gas and dry quenching waste heat integrated power generation system, and this system make full use of the chemical energy released by coke oven gas combustion and the generated steam of sensible heat released by coke in the dry quenching and drive the steam turbine to do work jointly to promote the thermal efficiency of system. In addition, the utility model with publication number CN105275515A discloses a coke oven flue gas waste heat and dry quenching waste heat coupling power generation system and a coupling power generation method thereof, which still relates to the comprehensive utilization of coke oven gas waste heat and dry quenching waste heat, and couples the exhaust smoke waste heat of a coking flue into the coupling power generation of dry quenching waste heat power generation circulation, thereby improving the thermal efficiency of the dry quenching waste heat boiler.
In summary, in the prior art, steam generated by waste heat of coke oven gas and steam generated by waste heat of dry quenching coke are mixed and then sent to generate power, and a coke oven gas power generation system and a dry quenching coke waste heat system are completely independent process systems, and only the steam of different systems is mixed. Although the coal gas fuel and the dry quenching waste heat are utilized to a certain extent, the problem that the efficiency of a dry quenching boiler and power generation equipment in the existing coking enterprises cannot be completely released is still solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a afterburning device of a coke dry quenching system, which is characterized in that gas fuel is introduced into the coke dry quenching system through a gas fuel pipeline for burning, so that the coke dry quenching circulating gas quantity can be increased, the inlet temperature of a coke dry quenching boiler can be stabilized, the power generation efficiency of the coke dry quenching boiler can be improved, the utilization efficiency of coke dry quenching system equipment can be improved, the technical problem caused by low-load operation of coking production can be solved, the direct investment of production equipment can be reduced, and the device is good in economy and reliable in technology.
The utility model is realized by the following technical scheme: the afterburning device of the coke dry quenching system comprises an air inlet channel arranged in a coke dry quenching furnace and a gas fuel pipeline communicated with the coke dry quenching system, wherein the gas fuel pipeline is arranged in an annular flue of the coke dry quenching furnace, at an outlet of the annular flue of the coke dry quenching furnace or at any position on a pipeline between the coke dry quenching furnace and a coke dry quenching boiler
The coal gas fuel pipeline is provided with an adjusting valve F0, the air inlet channel is provided with an adjusting valve F1, the inlet of the dry quenching boiler is provided with a temperature sensor, and the temperature sensor is controlled by a controller in a linkage manner with the adjusting valve F0 and the adjusting valve F1.
An inert gas purging system and a quick closing valve are arranged on the gas fuel pipeline.
An air inlet fan is arranged on the air inlet channel.
And the dry quenching system is provided with a cold air channel for adjusting the inlet temperature of the dry quenching boiler.
The dry quenching boiler is internally provided with a superheater and a reheater which exchange heat in sequence, a superheated steam outlet of the superheater is connected with a steam inlet of a high-pressure cylinder of the steam turbine, a steam outlet of the high-pressure cylinder of the steam turbine is connected with the reheater, and a reheated steam outlet of the reheater is connected with a steam inlet of a low-pressure cylinder of the steam turbine.
Compared with the prior art, the utility model has the following advantages and beneficial effects:
(1) according to the utility model, the coal gas fuel is introduced into the conventional dry quenching system, and after high-temperature flue gas generated by combustion of the coal gas fuel is mixed with high-temperature inert gas generated by the dry quenching system, the inlet temperature of the dry quenching boiler can be stabilized, and meanwhile, the flow of circulating flue gas is increased, so that the purpose of increasing the steam yield of the boiler is achieved. The load of the dry quenching boiler equipment in the dry quenching system can be improved by 20-30%, so that the steam yield and the power generation efficiency of the system are improved, the increased engineering investment can be recovered within 6 months to 1 year of the operation of the system, the equipment cost is low, and the economic benefit is remarkable.
(2) The utility model introduces the coal gas fuel into the dry quenching system through the pipeline, has flexible introduction position, and is not limited to any position in the annular flue of the dry quenching furnace, at the outlet of the annular flue of the dry quenching furnace or on the pipeline between the dry quenching furnace and the boiler of the dry quenching furnace. When the dry quenching device is used, high-temperature flue gas can be obtained by burning introduced gas fuel and air supplemented by a system, the high-temperature flue gas can be realized by simple modification of a pipeline structure, the number of equipment devices is small, the product manufacture is relatively easy, and the engineering investment is far lower than the cost of additionally arranging a whole set of dry quenching device or independently arranging a whole set of gas boiler device for consuming abundant gas.
(3) The utility model controls the flow of the high-temperature flue gas by reasonably controlling the proportion of the gas fuel and the combustion-supporting gas, can utilize the temperature sensor to be interlocked with the controller of the corresponding supply mechanism (comprising pipelines of the gas fuel, the combustion-supporting gas and the high-temperature inert gas and corresponding regulating valves) in order to realize the automatic control of the temperature of the mixed flue gas, and realizes the lifting of the inlet temperature of the dry quenching boiler. In actual operation, when the detected temperature is lower than the lower limit value of the set temperature range, the fuel supply amount is automatically increased; when the detected temperature is higher than the upper limit value of the set temperature range, the fuel supply amount is automatically reduced.
(4) The utility model can effectively improve the inlet temperature of the dry quenching boiler gas by using the high-temperature flue gas generated by burning the coal gas fuel and stabilize the inlet temperature at 900-980 ℃, can improve the overall cycle thermal efficiency of the system by using the improved high-grade heat energy, and certainly can add an intermediate once reheating system into the dry quenching waste heat power generation system in order to fully utilize the dry quenching waste heat and improve the waste heat power generation economy. The intermediate once reheating system is characterized in that new steam generated by a boiler is expanded to a certain intermediate pressure in a high-pressure cylinder of a steam turbine instead of being expanded to the lowest pressure in the steam turbine, the new steam is led out, the new steam is then sent to a reheater to increase the steam superheating temperature, the outlet temperature of the reheated steam is equivalent to the temperature of main steam, and then the reheated steam is sent to a low-pressure cylinder of the steam turbine to continue to expand to do work until steam exhaust steam becomes condensed water, and the steam is expanded to do work in the steam turbine. The other processes are the same as for the no reheat system. The high-temperature ultrahigh pressure/ultrahigh-temperature ultrahigh pressure and intermediate single-reheat steam turbine is high in internal efficiency and overall thermal efficiency, and the intermediate reheating technology can improve the dryness of last-stage blades of the steam turbine and the stable operation of a unit.
Drawings
FIG. 1 is a schematic process flow diagram of the present invention.
The system comprises a dry quenching furnace 1, a primary dust remover 2, a dry quenching boiler 3, a superheater 4, a reheater 5, a turbine high-pressure cylinder 6, a turbine low-pressure cylinder 7, a secondary dust remover 8, a circulating fan 9, a feed water preheater 10, a gas fuel pipeline 11, an air inlet channel 12 and an air inlet fan 13.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto.
Example 1:
the embodiment relates to a afterburning device of a dry quenching system.
The device is characterized in that a gas fuel pipeline is additionally arranged on the basis of the existing dry quenching system, and gas fuel is introduced into the dry quenching system, so that high-temperature flue gas generated by combustion of the gas fuel is mixed with high-temperature inert gas generated by a dry quenching furnace 1 to form mixed flue gas, and then the mixed flue gas is sent into a dry quenching boiler 3.
In the implementation, a gas fuel pipeline 11 is adopted to connect gas fuel into a dry quenching system, the gas fuel includes but is not limited to coke oven gas or blast furnace gas, and a quick-closing valve, an adjusting valve F0 and an inert gas purging system are arranged on the gas fuel pipeline 11. Wherein, the quick-closing valve is used for immediately closing the gas fuel pipeline 11 when the dry quenching system fails; the regulating valve F0 is used for regulating the gas flow of the gas fuel pipeline 11; the inert gas purging system is used for purging air in the pipeline before the gas fuel is introduced, so that explosion accidents are prevented. The access location of the gas fuel piping 11 includes, but is not limited to, the annular flue of the dry quenching furnace 1, the outlet of the annular flue of the dry quenching furnace, or any location on the piping between the dry quenching furnace 1 and the dry quenching boiler 3, such as shown in fig. 1, provided at the outlet of the annular flue of the dry quenching furnace. In order to realize the combustion of the coal gas fuel in the dry quenching system, the air inlet channel 12 of the dry quenching furnace 1 is utilized to introduce the outside air into the dry quenching system while introducing the coal gas fuel, so that the coal gas fuel is contacted with the air and is combusted to generate high-temperature flue gas. The air intake passage 12 is provided with an air introducing fan 13 and a regulating valve F1.
In the embodiment, the high-temperature flue gas and the high-temperature inert gas are used in a matched manner, so that the temperature of the inlet of the coke dry quenching boiler 3 can be stably controlled to be 900-980 ℃, meanwhile, the flow rate of circulating flue gas in a coke dry quenching system is increased, the steam yield of the boiler is fully improved, and the power generation efficiency of the boiler is improved. In actual operation, in order to realize stable control of the inlet temperature of the coke dry quenching boiler 3, a temperature sensor is arranged at the inlet of the coke dry quenching boiler 3, the temperature sensor is used for detecting the inlet temperature of the coke dry quenching boiler 3 in real time, the standard temperature is preset, and when the detected temperature is lower than or higher than the standard temperature, the flow control of the regulating valve F0 on the gas fuel pipeline 11 and the flow control of the regulating valve F1 on the air inlet channel 12 are realized through automatic interlocking control of a controller. When the detected temperature is higher than the standard temperature, cold air can be introduced into the dry quenching system by utilizing a cold air channel of the dry quenching system, so that the inlet temperature of the dry quenching boiler 3 is kept stable, the heat load of the dry quenching boiler 3 is further ensured, and the power generation efficiency is improved.
In a specific embodiment, the coal gas used as the coal gas with the temperature of 600-700 ℃ is sent to the outlet of the annular flue of the dry quenching furnace through a coal gas fuel pipe, and the flow rate of the regulating valve F0 is controlled to be 20000Nm3About/h, while the air introducing fan 13 is turned on, the flow rate of the control valve F1 is controlled to 10000Nm3And about/h. The coal gas and the air are contacted and combusted in the dry quenching system to generate high-temperature flue gas with about 20000Nm3The temperature is 900-980 ℃, the temperature of high-temperature inert gas generated by the dry quenching furnace 1 is 900-980 ℃, and the volume ratio of the high-temperature flue gas to the high-temperature inert gas is controlled to be (1-2): (6-7), the temperature of the inlet of the dry quenching boiler 3 can be stably controlled at 900-980 ℃.
Example 2:
the embodiment relates to a coke dry quenching system provided with a coal gas afterburning device.
In the dry quenching system, the coal gas fuel is introduced and then burnt to generate high-temperature flue gas which enters the dry quenching boiler 3, so that the coal gas fuel as a supplementary fuel can improve the heat load of the dry quenching boiler 3, and the steam generated by the dry quenching boiler 3 further pushes a steam turbine to generate power.
In one specific embodiment, as shown in fig. 1, the process flow of the dry quenching system is as follows: the dry quenching furnace 1 receives the inert circulating gas cooled by the dry quenching boiler 3, the temperature of the inert circulating gas is raised to 850-980 ℃ after the inert circulating gas absorbs the sensible heat of coke, the high-temperature inert circulating gas is discharged from a chute area of the dry quenching furnace and enters a primary dust remover 2, and the high-temperature inert circulating gas enters the dry quenching boiler 3 after coarse particle coke powder is separated; the coal gas is guided into a dry quenching system to be combusted to generate high-temperature flue gas, the temperature of the flue gas at the inlet of the dry quenching boiler 3 is increased, and the high-temperature flue gas is mixed with the inert high-temperature gas from the dry quenching boiler 1 and enters the dry quenching boiler 3. Heat exchange equipment such as a superheater 4, an evaporator, a reheater 5, an economizer and the like are sequentially arranged in the dry quenching boiler 3 from top to bottom, and water in the dry quenching boiler 3 is preheated, evaporated and superheated to generate main steam; the exhaust gas temperature of the dry quenching boiler 3 is 160-180 ℃, the inert circulating gas is dedusted by a secondary deduster 8 and then enters a feed water preheater 10 through a circulating fan 9, and the inert circulating gas with the temperature of the heat-exchanged exhaust gas reduced to 120-130 ℃ is sent into a dry quenching furnace 1; steam generated by the dry quenching boiler 3 enters the power station steam turbine high-pressure cylinder 6 and the steam turbine high-pressure cylinder 6 to do work through expansion, heat energy is converted into mechanical energy and electric energy, exhaust steam of the steam turbine is condensed into condensed water and sent back to the dry quenching desalting water tank, and steam-water circulation of power generation of the dry quenching boiler 3 is completed.
Furthermore, superheated steam (540-570 ℃) after heat exchange of the superheater 4 in the dry quenching boiler 3 can be sent to the high-pressure cylinder 6 of the steam turbine, exhausted steam (exhaust pressure 3.5-4.5 Mpa) of the high-pressure cylinder 6 of the steam turbine is sent to the reheater 5, the obtained reheated steam (540-570 ℃) is sent to the low-pressure cylinder 7 of the steam turbine (inlet pressure 3.0-3.9 Mpa), the waste heat of dry quenching can be fully utilized, and meanwhile, the dryness of last-stage blades of the steam turbine and the stable operation of a unit can be improved.
The steam-water flow in the dry quenching boiler 3 is as follows:
demineralized water → demineralized water tank → deaerator water-feeding pump → sub-economizer → deaerator → boiler water-feeding pump → economizer → evaporator → superheater 4 → superheated steam → steam turbine high-pressure cylinder 6 → reheater 5 → reheated steam → steam turbine low-pressure cylinder 7 → condenser → condensate → demineralized water tank.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. The utility model provides a coke dry quenching system afterburning device which characterized in that: the dry quenching device comprises an air inlet channel (12) arranged in a dry quenching furnace (1) and a gas fuel pipeline (11) communicated with a dry quenching system, wherein the gas fuel pipeline is arranged in an annular flue of the dry quenching furnace (1), at an outlet of the annular flue of the dry quenching furnace or at any position on a pipeline between the dry quenching furnace (1) and a dry quenching boiler (3).
2. The afterburning device of a dry quenching system of claim 1, wherein: an adjusting valve F0 is arranged on the gas fuel pipeline (11), an adjusting valve F1 is arranged on the air inlet channel (12), a temperature sensor is arranged at the inlet of the dry quenching boiler (3), and the temperature sensor is controlled by a controller in a linkage mode with the adjusting valve F0 and the adjusting valve F1.
3. The afterburning device of a dry quenching system of claim 1, wherein: an inert gas purging system and a quick closing valve are arranged on the gas fuel pipeline (11).
4. The afterburning device of a dry quenching system of claim 1, wherein: an air inlet fan (13) is arranged on the air inlet channel (12).
5. The afterburning device of a dry quenching system of claim 1, wherein: the dry quenching system is provided with a cold air channel for adjusting the inlet temperature of the dry quenching boiler (3).
6. The afterburning device of a dry quenching system of claim 1, wherein: the dry quenching boiler is characterized in that a superheater (4) and a reheater (5) which exchange heat in sequence are arranged in the dry quenching boiler (3), a superheated steam outlet of the superheater (4) is connected with a steam inlet of a high-pressure cylinder (6) of a steam turbine, a steam outlet of the high-pressure cylinder (6) of the steam turbine is connected with the reheater (5), and a reheated steam outlet of the reheater (5) is connected with a steam inlet of a low-pressure cylinder (7) of the steam turbine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122960376.5U CN216192076U (en) | 2021-11-26 | 2021-11-26 | Afterburning device of dry quenching system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122960376.5U CN216192076U (en) | 2021-11-26 | 2021-11-26 | Afterburning device of dry quenching system |
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| CN216192076U true CN216192076U (en) | 2022-04-05 |
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| CN202122960376.5U Active CN216192076U (en) | 2021-11-26 | 2021-11-26 | Afterburning device of dry quenching system |
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