CN210638530U - Waste heat heating device of dry quenching ultrahigh-temperature ultrahigh-pressure gas condensation type generator set - Google Patents
Waste heat heating device of dry quenching ultrahigh-temperature ultrahigh-pressure gas condensation type generator set Download PDFInfo
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Abstract
The utility model relates to a dry coke quenching waste heat heating technique, especially a dry coke quenching ultra-high temperature ultra-high condensation gas formula generating set waste heat heating system, characterized by: in the dry coke quenching boiler, a feed water preheater, a high-pressure economizer, a finned tube evaporator, a light tube evaporator, a low-temperature superheater and a high-temperature superheater are sequentially distributed from bottom to top from a boiler flue gas outlet end to a boiler flue gas inlet end; wherein, the inlet pipeline and the outlet pipeline of the finned tube evaporator and the optical tube evaporator are connected with two corresponding outlet pipelines and inlet pipelines of a boiler steam drum through a boiler header; the inlet pipeline or the outlet pipeline of the high-pressure economizer and the low-temperature superheater are connected with two corresponding outlet pipelines or inlet pipelines of a boiler drum through a boiler header; an outlet pipe of the low-temperature superheater is connected with an inlet pipe of the high-temperature superheater; and an outlet pipe of the high-temperature superheater is connected with an inlet of a steam turbine on the outer side of the dry quenching boiler. The system realizes the low-temperature waste heat reutilization of the dry quenching ultrahigh-temperature ultrahigh-voltage power generation system, and further improves the energy utilization efficiency of the dry quenching waste heat utilization system.
Description
Technical Field
The utility model relates to a dry quenching waste heat heating technology, especially a dry quenching ultra-high temperature ultra-high pressure congeals gas formula generating set waste heat heating system.
Background
Through the rapid development of nearly 20 years, the problems of environment, energy consumption, pollution and the like caused by the steel industry in China are prominent, the steel industry becomes the key industry of resource consumption and pollution emission in China, the steel industry occupies more than 25% of the total energy consumption in the national industry, and the sustainable development potential of the steel industry in China is severely restricted.
The dry quenching waste heat power generation technology can recover about 83 percent of the sensible heat of red coke, reduce the atmospheric pollution, improve the coke quality and optimize the blast furnace production, and is an energy-saving and environment-friendly process system in the steel industry. The dry quenching waste heat power generation refers to a process system which adopts a dry quenching waste heat boiler to absorb heat of inert circulating flue gas of a dry quenching system to generate steam, and then the steam enters a steam turbine to convert the heat energy into kinetic energy so as to drag a generator to generate electric energy. The dry quenching waste heat power generation system finally converts the red coke sensible heat energy into electric energy, can obviously reduce the power consumption of coking and steel enterprises, and can bring great economic benefits.
At present, in a dry quenching power generation process, a dry quenching boiler generates ultrahigh-temperature and ultrahigh-pressure steam (steam pressure is 9.81MPa, steam temperature is 540 ℃) or ultrahigh-temperature and ultrahigh-pressure steam (steam pressure is 17.6MPa, steam temperature is 571 ℃) to generate power, and an ultrahigh-temperature and ultrahigh-pressure steam turbine generator unit or an ultrahigh-temperature and ultrahigh-pressure steam turbine generator unit is matched with the steam. When the steam turbine generator unit adopts a condensing steam turbine generator unit, the heat of the exhaust steam of the condenser can be taken away by circulating cooling water, so that the loss of a cold source is caused. At the moment, the exhaust pressure and the temperature of the steam turbine are both very low (generally 4.9kPa, the corresponding saturation temperature is 32.51 ℃), the heat taken away is very large, if the heat is not utilized, a large amount of energy is wasted, and the energy utilization rate of a power generation system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a gas formula generating set low vacuum waste heat heating system is congealed to ultra-high pressure of dry coke quenching to realize the low temperature waste heat of dry coke quenching ultra-high temperature superhigh pressure power generation system and recycle, further improve the energy efficiency of dry coke quenching waste heat utilization system.
The utility model aims at realizing like this, a gas formula generating set waste heat heating system is congealed to dry coke quenching ultra-high temperature superhigh pressure includes at least: the system comprises a boiler steam drum, a dry quenching boiler, a boiler water feed pump, a deaerator, a condensate pump, a boiler header, a steam turbine, a generator, a condenser, a cooling circulating water pump, a cooling tower, a heating circulating water pump, a peak shaving steam-water heat exchanger, a heating user, a cooling circulating water switching valve, a feed water preheater, a high-pressure economizer, a finned tube evaporator, a light tube evaporator, a low-temperature superheater and a high-temperature superheater; the method is characterized in that: in the dry coke quenching boiler, a feed water preheater, a high-pressure economizer, a finned tube evaporator, a light tube evaporator, a low-temperature superheater and a high-temperature superheater are sequentially distributed from bottom to top from a boiler flue gas outlet end to a boiler flue gas inlet end; wherein, the inlet pipeline and the outlet pipeline of the finned tube evaporator and the optical tube evaporator are connected with two corresponding outlet pipelines and inlet pipelines of a boiler steam drum through a boiler header; the inlet pipeline or the outlet pipeline of the high-pressure economizer and the low-temperature superheater are connected with two corresponding outlet pipelines or inlet pipelines of a boiler drum through a boiler header; an outlet pipe of the low-temperature superheater is connected with an inlet pipe of the high-temperature superheater; an outlet pipe of the high-temperature superheater is connected with an inlet of a steam turbine on the outer side of the dry quenching boiler; the water inlet of the feed water preheater is communicated with the water outlet of the condenser, and the water outlet of the feed water preheater is communicated with the inlet end of the high-pressure economizer through a deaerator and a boiler feed water pump which are connected in series; the steam turbine is connected with the generator; the condenser is connected with the low-vacuum waste heat heating unit.
The low-vacuum waste heat heating unit comprises a cooling circulating water pump, a cooling tower, a heating circulating water pump, a peak-shaving steam-water heat exchanger and a heating user; the cooling circulating water pump is connected with the cooling tower in a closed loop, and the outer interface of the cooling circulating water pump is connected with the condenser through a cooling circulating water switching valve; the heating circulating water pump, the peak-shaving steam-water heat exchanger and the heating user are a closed loop group, and the outer interface of the closed loop group is also connected with the condenser through the cooling circulating water switching valve.
The heating circulating water pumps are connected in parallel, on one hand, the heating circulating water pumps can be used for standby, and on the other hand, the capacity can be increased.
The inlet end of the heating circulating water pump is connected with a water replenishing pipe to replenish the shortage of water in the heating circulating system; the water replenishing pipe adopts chemical demineralized water for replenishing water so as to prevent the copper pipe of the condenser from scaling and corroding and influence the heat transfer effect.
The heat exchange output end of the peak-shaving steam-water heat exchanger is connected with a heating user and the outlet of the condenser in parallel; one end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger is connected with a plant area steam source, and the other end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger is connected with a condensate water tank.
A waste heat heating method for a dry quenching ultrahigh-temperature ultrahigh-pressure condensing type generator set is characterized in that a flue gas unit of a dry quenching boiler and a steam-water unit of the dry quenching boiler are connected to an inlet of an outlet of a condenser; a cooling circulating water switching valve is arranged at the outlet of the condenser and is switched in a two-way four-pipe mode; the working mode is switched between summer and winter:
(1) when the operation condition is in summer, the steam turbine and the condenser set are operated under the normal pure condensing condition, the exhaust pressure is 4.9kPa, and the exhaust temperature is 32.51 ℃; the circulating cooling water is a cooling tower loop, and the circulating cooling water cooled by the cooling tower returns to the condenser to complete cooling water circulation in summer;
(2) in winter, the condensing steam turbine set is adjusted to a low vacuum operation condition, the exhaust pressure is 30kPa, and the exhaust temperature is 69.12 ℃; heating backwater at 45 ℃ returned by industrial heating users returns to the condenser, exchanges heat with exhaust steam in the condenser through the peak-shaving steam-water heat exchanger, and the temperature is raised to 60 ℃ to the industrial heating users, so that centralized heating is realized, and cooling water circulation in winter is completed; the two sets of valves for the system can be quickly switched in winter and summer.
The high-temperature inert circulating flue gas which absorbs sensible heat of red coke and is discharged from the dry quenching boiler flue gas unit is removed by a primary dust remover, coarse-particle coke powder enters from a boiler inlet, vertically and downwards flows through a high-temperature superheater, a steam reheater, a low-temperature superheater, a light pipe evaporator, a fin pipe evaporator, a high-pressure economizer, a low-pressure evaporator and a water supply preheater in sequence, is finally led out from the bottom of the boiler and returns to the dry quenching boiler, and the circulation of the dry quenching boiler flue gas unit is completed.
The waste steam of a condenser connected with a steam-water unit of the dry quenching boiler exchanges heat with the steam-water heat exchanger through peak regulation, condensed water of the waste steam enters a feed water preheater of the dry quenching boiler through a condensed water pump to be heated, then enters a deaerator, is pressurized by a boiler feed water pump, and then sequentially passes through a high-pressure economizer, a finned tube evaporator, a light tube evaporator, a low-temperature superheater and a high-temperature superheater to exchange heat with circulating flue gas, so that ultra-high-temperature and ultra-high-pressure steam with the pressure of 17.6MPa and the temperature of 571 ℃ is generated, and then the steam enters a turbo.
The utility model has the advantages that:
the utility model discloses in the ultrahigh-temperature superhigh pressure waste heat power generation system of dry quenching, condenser casing, door plant and door plant flange reinforce the design, and in the heating period in winter, superhigh-temperature superhigh pressure turbo generator set adjusts to low vacuum operation, realizes the central heating demand to factory industrial building. Compared with the prior art:
(1) provides a central heating heat source for industrial buildings in a plant area, further improves the energy utilization efficiency of a dry quenching ultrahigh-temperature and ultrahigh-pressure waste heat power generation system (the thermal efficiency of a condensing steam turbine is improved from 40 percent to 90 percent), saves the steam consumption for heating in the plant area, indirectly saves the coal consumption, thereby reducing SOxAnd NOxThe discharge amount of the heat pump has obvious energy-saving and environment-friendly benefits, and power generation and heating are achievedThe double economic benefits of (1).
(2) The system is provided with a peak-shaving steam-water heat exchanger as a standby heat source, when a heating severe cold period or a steam turbine generator unit breaks down, the heating system can ensure the stable operation of the heating system through the peak-shaving steam-water heat exchanger, and the heat source of the peak-shaving steam-water heat exchanger is from low-pressure waste heat steam which is near in a steel plant or a coking plant.
(3) Compared with the conventional ultrahigh-temperature and ultrahigh-pressure power generation, the power generation efficiency can be improved by 3 percent by adopting the dry quenching ultrahigh-temperature and ultrahigh-pressure steam power generation system.
Drawings
The invention will be further explained with reference to the drawings of the embodiments:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
The attached drawings are as follows: 1. a boiler drum; 2. a dry quenching boiler; 3. a boiler feed pump; 4. a deaerator 5 and a condensate pump; 6. a boiler header; 7. a steam turbine; 8. a generator; 9. a condenser; 10. cooling the circulating water pump; 11. a cooling tower; 12. a heating circulating water pump; 13. a peak shaving steam-water heat exchanger; 14. a heating user; 15. a cooling circulating water switching valve; 16. a feed water preheater; 17. a high-pressure economizer; 18. a finned tube evaporator; 19. a light pipe evaporator; 20. a low temperature superheater; 21. a high temperature superheater.
Detailed Description
As shown in fig. 1, a waste heat heating device of a dry quenching ultrahigh temperature ultrahigh pressure condensing gas type generator set comprises: the system comprises a boiler drum 1, a dry quenching boiler 2, a boiler feed pump 3, a deaerator 4, a condensate pump 5, a boiler header 6, a steam turbine 7, a generator 8, a condenser 9, a cooling circulating water pump 10, a cooling tower 11, a heating circulating water pump 12, a peak shaving steam-water heat exchanger 13, a heating user 14, a cooling circulating water switching valve 15, a feed water preheater 16, a high-pressure economizer 17, a finned tube evaporator 18, a light tube evaporator 19, a low-temperature superheater 20 and a high-temperature superheater 21; the method is characterized in that: in the dry quenching boiler 2, a feed water preheater 16, a high-pressure economizer 17, a finned tube evaporator 18, a light tube evaporator 19, a low-temperature superheater 20 and a high-temperature superheater 21 are sequentially distributed from bottom to top from a boiler flue gas outlet end to a boiler flue gas inlet end; wherein, the inlet pipelines and the outlet pipelines of the finned tube evaporator 18 and the light tube evaporator 19 are connected with two corresponding outlet pipelines and inlet pipelines of the boiler steam drum 1 through the boiler header 6; the inlet pipelines or outlet pipelines of the high-pressure economizer 17 and the low-temperature superheater 20 are connected with two corresponding outlet pipelines or inlet pipelines of the boiler drum 1 through the boiler header 6; an outlet pipe of the low-temperature superheater 20 is connected with an inlet pipe of the high-temperature superheater 21; an outlet pipe of the high-temperature superheater 21 is connected with an inlet of a steam turbine 7 on the outer side of the dry quenching boiler 2; the water inlet of the feed water preheater 16 is communicated with the water outlet of the condenser 9, and the water outlet of the feed water preheater 16 is communicated with the inlet end of the high-pressure economizer 17 through a deaerator 4 and a boiler feed pump 3 which are connected in series; the steam turbine 7 is connected with a generator 8; and the condenser 9 is connected with the low-vacuum waste heat heating unit.
The low-vacuum waste heat heating unit comprises a cooling circulating water pump 10, a cooling tower 11, a heating circulating water pump 12, a peak-shaving steam-water heat exchanger 13 and a heating user 14; the cooling circulating water pump 10 and the cooling tower 11 are connected in a closed loop, and the outer interface of the cooling circulating water pump is connected with the condenser 9 through a cooling circulating water switching valve 15; the heating circulating water pump 12, the peak regulation steam-water heat exchanger 13 and the heating user 14 are a closed loop group, and the external interfaces of the closed loop group are also connected with the condenser 9 through the cooling circulating water switching valve 15.
The heating circulating water pump 12 is connected in parallel, on one hand, the heating circulating water pump can be used for standby, and on the other hand, the capacity can be increased.
The inlet end of the heating circulating water pump 12 is connected with a water replenishing pipe to replenish the shortage of water of the heating circulating system; the water replenishing pipe adopts chemical demineralized water for replenishing water so as to prevent the copper pipe of the condenser from scaling and corroding and influence the heat transfer effect.
The heat exchange output end of the peak-shaving steam-water heat exchanger 13 is connected with a heating user 14 and an outlet of the condenser 9 in parallel; one end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger 13 is connected with a plant area steam source, and the other end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger is connected with a condensate water tank.
The utility model discloses a theory of operation: in order to realize two circulation modes of heating in winter and cooling in summer, the utility model is provided with a cooling circulating water switching valve 15 at the outlet of the condenser 9, and the cooling circulating water switching valve 15 is switched by two-way and four-pipe systems; the working mode is switched between summer and winter:
(1) and in the summer operation working condition, the turbine 7 and the condenser 9 set are operated under the normal pure condensing working condition, the exhaust pressure is 4.9kPa, and the exhaust temperature is 32.51 ℃. The circulating cooling water is a cooling tower loop, and the circulating cooling water cooled by the cooling tower returns to the condenser 9 to complete cooling water circulation in summer;
(2) in winter, the condensing steam turbine set is regulated to low vacuum operation with exhaust pressure of 30kPa and exhaust temperature of 69.12 deg.c. Heating backwater of 45 ℃ returned by the industrial heating users 14 returns to the condenser 9, exchanges heat with exhaust steam in the condenser 9 through the peak-shaving steam-water heat exchanger 13, and the temperature is raised to 60 ℃ to the industrial heating users, so that centralized heating is realized, and cooling water circulation in winter is completed. The two sets of valves for the system can be quickly switched in winter and summer.
The introduction of other parts of the system of the low vacuum waste heat heating device of the dry quenching double super condensing steam type generator set is as follows:
the utility model has two systems, namely a dry quenching boiler flue gas unit and a dry quenching boiler steam-water unit; high-temperature inert circulating flue gas which absorbs sensible heat of red coke and is discharged from a dry quenching boiler flue gas unit is removed by a primary dust remover, coarse granular coke powder enters from a boiler inlet, vertically and downwards flows through a high-temperature superheater 21, a steam reheater, a low-temperature superheater 20, a light pipe evaporator 19, a finned pipe evaporator 18, a high-pressure economizer 17, a low-pressure evaporator and a water supply preheater 16 in sequence, and finally is led out from the bottom of the boiler and returns to the dry quenching boiler 2, so that the circulation of the dry quenching boiler flue gas unit is completed.
The waste steam of a steam-water unit condenser 9 of a coke dry quenching boiler exchanges heat with a peak-shaving steam-water heat exchanger 13, condensed water of the condensed water enters a feed water preheater 16 of a coke dry quenching (waste heat) boiler 2 through a condensed water pump 5 to be heated, then enters a deaerator 4, is pressurized through a boiler feed water pump 3, sequentially passes through a high-pressure economizer 17, a finned tube evaporator 18, a light tube evaporator 19, a low-temperature superheater 20 and a high-temperature superheater 21 to exchange heat with circulating flue gas, generates ultrahigh-temperature and ultrahigh-pressure steam with the pressure of 17.6MPa and the temperature of 571 ℃, and then enters a steam turbine generator unit to generate power.
At any time, the pressure bearing of the water side of the condenser is ensured not to exceed 0.4MPa, and the temperature is not higher than 45 ℃. Therefore, an overpressure and overtemperature alarm device is arranged on a cooling circulating water return pipeline, and a demineralized water spraying device is additionally arranged at a steam exhaust port of the condenser to prevent overtemperature.
In a dry quenching ultrahigh-temperature ultrahigh-pressure condensing steam type power generation system, when a condensing steam turbine operates in low vacuum in winter, the steam exhaust pressure of the steam turbine is increased to 30kPa from 4.9kPa, the corresponding exhaust steam saturation temperature is increased to 69.12 ℃ from 32.51 ℃, and the heating requirement of industrial users in winter is met. In order to realize low-vacuum operation of the condenser and meet the condition that circulating water is directly heated, the pressure bearing capacity of the condenser can meet the requirement of heating and water replenishing point pressure when a condenser shell, a door plate and a door plate flange are designed, and the general design pressure bearing capacity can reach 0.4 MPa.
The components and structures of the present embodiments that are not described in detail are well known in the art and do not constitute essential structural elements or elements.
Claims (5)
1. The utility model provides a dry quenching superhigh temperature superhigh pressure congeals gas formula generating set waste heat heating system, includes at least: the system comprises a boiler steam drum (1), a dry quenching boiler (2), a boiler water feed pump (3), a deaerator (4), a condensate pump (5), a boiler header (6), a steam turbine (7), a generator (8), a condenser (9), a cooling circulating water pump (10), a cooling tower (11), a heating circulating water pump (12), a peak shaving steam-water heat exchanger (13), a heating user (14), a cooling circulating water switching valve (15), a feed water preheater (16), a high-pressure economizer (17), a finned tube evaporator (18), a light tube evaporator (19), a low-temperature superheater (20) and a high-temperature superheater (21); the method is characterized in that: in the dry quenching boiler (2), a feed water preheater (16), a high-pressure economizer (17), a finned tube evaporator (18), a light tube evaporator (19), a low-temperature superheater (20) and a high-temperature superheater (21) are sequentially distributed from the bottom up from the boiler flue gas outlet end to the boiler flue gas inlet end; wherein, the inlet pipeline and the outlet pipeline of the finned tube evaporator (18) and the light tube evaporator (19) are connected with two corresponding outlet pipelines and inlet pipelines of the boiler steam drum (1) through the boiler header (6); the inlet pipeline or the outlet pipeline of the high-pressure economizer (17) and the low-temperature superheater (20) are connected with two corresponding outlet pipelines or inlet pipelines of the boiler drum (1) through a boiler header (6); an outlet pipe of the low-temperature superheater (20) is connected with an inlet pipe of the high-temperature superheater (21); an outlet pipe of the high-temperature superheater (21) is connected with an inlet of a steam turbine (7) on the outer side of the dry quenching boiler (2); the water inlet of the feed water preheater (16) is communicated with the water outlet of the condenser (9), and the water outlet of the feed water preheater (16) is communicated with the inlet end of the high-pressure economizer (17) through a deaerator (4) and a boiler feed water pump (3) which are connected in series; the steam turbine (7) is connected with the generator (8); and the condenser (9) is connected with the low-vacuum waste heat heating unit.
2. The waste heat heating device of the dry quenching ultrahigh-temperature ultrahigh-pressure gas condensing type generator set according to claim 1, which is characterized in that: the low-vacuum waste heat heating unit comprises a cooling circulating water pump (10), a cooling tower (11), a heating circulating water pump (12), a peak-shaving steam-water heat exchanger (13) and a heating user (14); the cooling circulating water pump (10) is connected with the cooling tower (11) in a closed loop, and the outer interface of the cooling circulating water pump is connected with the condenser (9) through a cooling circulating water switching valve (15); the heating circulating water pump (12), the peak regulation steam-water heat exchanger (13) and the heating user (14) are a closed loop group, and the outer interface of the closed loop group is also connected with the condenser (9) through a cooling circulating water switching valve (15).
3. The waste heat heating device of the dry quenching ultrahigh-temperature ultrahigh-pressure gas condensing type generator set according to claim 1, which is characterized in that: the heating circulating water pump (12) is connected in parallel, on one hand, the heating circulating water pump is standby, and on the other hand, the capacity is increased.
4. The waste heat heating device of the dry quenching ultrahigh-temperature ultrahigh-pressure gas condensing type generator set according to claim 1, which is characterized in that: the inlet end of the heating circulating water pump (12) is connected with a water replenishing pipe to replenish the shortage of water of the heating circulating system; the water replenishing pipe adopts chemical demineralized water for replenishing water so as to prevent the copper pipe of the condenser from scaling and corroding and influence the heat transfer effect.
5. The waste heat heating device of the dry quenching ultrahigh-temperature ultrahigh-pressure gas condensing type generator set according to claim 1, which is characterized in that: the heat exchange output end of the peak regulation steam-water heat exchanger (13) is connected with a heating user (14) and the outlet of the condenser (9) in parallel; one end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger (13) is connected with a plant area steam source, and the other end of the heat exchange inlet end of the peak-shaving steam-water heat exchanger is connected with a condensate water tank.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455088A (en) * | 2019-08-14 | 2019-11-15 | 西安华江环保科技股份有限公司 | A kind of solidifying gas formula generating set residual heat heating device and method of dry coke quenching superhigh temperature super-pressure |
| WO2022242472A1 (en) * | 2021-05-20 | 2022-11-24 | 中冶焦耐(大连)工程技术有限公司 | Ultrahigh-temperature ultrahigh-pressure reheating coke dry quenching waste heat power generation system and method |
-
2019
- 2019-08-14 CN CN201921309767.7U patent/CN210638530U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110455088A (en) * | 2019-08-14 | 2019-11-15 | 西安华江环保科技股份有限公司 | A kind of solidifying gas formula generating set residual heat heating device and method of dry coke quenching superhigh temperature super-pressure |
| WO2022242472A1 (en) * | 2021-05-20 | 2022-11-24 | 中冶焦耐(大连)工程技术有限公司 | Ultrahigh-temperature ultrahigh-pressure reheating coke dry quenching waste heat power generation system and method |
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