CN211233029U - Coupling system of biomass thermoelectric unit and 300MW thermoelectric unit - Google Patents
Coupling system of biomass thermoelectric unit and 300MW thermoelectric unit Download PDFInfo
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Abstract
The utility model discloses a living beings thermoelectric unit and 300MW thermoelectric unit's coupled system belongs to combined heat and power generation technical field. The biomass heat supply system comprises a 300MW thermoelectric unit module, a biomass unit module and a heat supply pipe network module. The utility model has the advantages that: improve the thermal efficiency of circulation, obtain higher power generation benefit, on the production management, also can reduce the person of deciding, improve production consumptive material availability factor, the utility model discloses a biomass unit module is independent with 300MW thermal motor group partial system coupling operation, electricity generation, has improved enterprise economic benefits and social environmental protection benefit greatly.
Description
Technical Field
The utility model relates to a coupled system of thermoelectric unit belongs to combined heat and power generation technical field.
Background
After the global petroleum crisis in the 70 s of the 20 th century, the biomass energy is regarded as important in the global scope, and the biomass energy is characterized by wide distribution, huge reserves and regeneration. The biomass energy source not only provides renewable clean energy, but also is more environment-friendly and civil engineering. Biomass power generation is one of the most common ways to utilize biomass energy, and is the third largest non-renewable energy power generation industry following wind power and photovoltaic power generation. Under the condition that the development of the wind power and photovoltaic industries is limited by various factors, the biomass energy can be utilized to show better development toughness. The biomass cogeneration is an important way for realizing the upgrading and high-efficiency conversion and utilization of the biomass power generation industry during thirteen-five periods, local materials are used in rich areas of agricultural and forestry wastes, the waste incineration is reduced, the coal burning is replaced, the pollution emission is reduced, the social and environmental benefits are far greater than the economic benefits, and the biomass cogeneration completely conforms to the supporting direction of clean heating in northern areas actively promoted by the current country.
At present, the biomass power generation technology mainly comprises 4 types, namely direct combustion power generation, gasification coupling power generation, mixed combustion power generation and methane power generation. The gasification coupling power generation heat utilization rate is low, the influence on the coal burning boiler efficiency is large, and the environment-friendly electric quantity metering is complex; the biogas has small power generation scale and high operation cost; the technology is mature, and the market range is wide.
The biomass cogeneration unit is a direct combustion power generation technology, and cannot fully show investment benefits due to higher unit manufacturing cost and operation cost. When the power generation and utilization of the 300MW thermoelectric generator set is low, the unit equipment system has large margin, and waste is caused; meanwhile, the problems of insufficient heat supply capacity in the heating period and insufficient steam supply during deep peak regulation of the power grid also exist. How to couple the biomass direct combustion cogeneration unit with the active 300MW thermoelectric generator unit part system, independently surf the net for power generation, supply heat and steam to be in grid-connected operation, reduce the unit cost of the biomass generator unit, maximize the biomass cogeneration benefit, improve the utilization rate of the 300MW thermoelectric generator unit equipment system, increase the heat supply and steam supply capacity and flexibility of a thermal power plant, and is the subject of being vigorously researched in the energy technology field.
SUMMERY OF THE UTILITY MODEL
For solving the defect that prior art exists, the utility model aims at providing a living beings thermoelectric generation unit and 300MW thermoelectric generation unit's coupled system can reduce living beings combined heat and power generation unit's unit cost and running cost, improves 300MW thermoelectric generation unit rate of equipment utilization, can solve the not enough problem of heat supply potential in heating season of steam power plant again.
The technical scheme of the utility model is that: a coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit comprises a 300MW thermoelectric unit module, a biomass unit module and a heat supply pipe network module;
the 300MW thermoelectric unit module comprises a denitration device connected with a boiler, a desulfurization tower is connected with an induced draft fan a through a dust remover, the desulfurization tower is connected with a chimney, the boiler is connected with a steam turbine a, the steam turbine a is connected with a condenser a and a generator a, the generator a is connected with an external power grid through a main transformer a and a control switch a, the generator a is connected with a plant power line a through a high-rise transformer a and a control switch b, a chemical water treatment system is connected with the condenser a, the condenser a is connected with a water cooling tower through a water inlet pipeline, and a circulating water pump a is arranged on a water return pipeline of the condenser a;
the biomass unit module comprises a biomass fluidized boiler connected with the denitration device through an induced draft fan b, the biomass fluidized boiler is connected with a steam turbine b, the steam turbine b is connected with a generator b, the generator b is connected with an external power grid through a main transformer b and a control switch c, the generator b is connected with a power plant line b through a high plant transformer b and a control switch d, the power plant line b is connected with a power plant line a through a power transmission line, a bus-bar switch is arranged on the power transmission line, the steam turbine b is connected with a condenser b, the condenser b is connected with a chemical water treatment system, a pipeline a of the condenser b is connected with a pipeline c and a pipeline e, a pipeline b connected with the condenser b is connected with a pipeline d and a pipeline f, the pipeline c is connected with a water inlet pipeline, the pipeline d is connected with a water return pipeline, and an isolation switching valve a and an isolation, an isolation switching valve c is arranged on the pipeline e, and an isolation switching valve d is arranged on the pipeline f;
the heat supply pipe network module comprises a heat supply pipe network connected with a heat supply network heater b connected with a pipeline e, the heat supply pipe network is further connected with a heat supply network heater a, a steam turbine a is connected with the heat supply network heater a and the heat supply network heater b through a control valve a, a water return pipe is connected with the heat supply network heater a, a heat supply network circulating pump a and a control valve b are arranged on the water return pipe, a pipeline f is connected with the water return pipe, and a heat supply network circulating pump b is arranged on the pipeline f.
The 300MW thermoelectric generator set module is a coal-fired subcritical, supercritical or ultra-supercritical cogeneration unit.
The biomass unit module is a heat and power cogeneration unit of a direct combustion biomass fluidized bed boiler.
The utility model has the advantages that: 1. the utility model discloses a living beings unit module and 300MW thermoelectric power unit divide the heating season according to different seasons and the coupling of non-heating season: in summer, after the steam turbine function of the biomass unit module, the exhaust steam exchanges heat with circulating cooling water, and the circulating water enters the circulating water of the 300MW thermoelectric unit and a water cooling tower system to release heat, so that the unit is ensured to operate safely; in the heating season, the waste steam and the circulating cooling water exchange heat after the steam turbine power of the biomass unit module in the heating season, the heating heat is directly supplied to residents at the initial stage and the final stage of the heat supply, the steam is extracted by the steam turbine of the 300MW thermoelectric unit for secondary heating at the middle stage of the heat supply, the heat is supplied to the residents, the steam exhaust heat loss of the biomass unit is reduced, and therefore the circulating heat efficiency is improved. 2. In addition, because biomass unit module and 300MW thermoelectric unit remove above-mentioned system coupling, still with system coupling such as factory electrical system, afterbody flue and denitration dust removal desulfurization system, the process water is direct to be supplied by 300MW thermoelectric unit chemical water processing system, makes biomass thermoelectric module unit cost reduce by a wide margin, and the net is gone on to the full volume of electricity generation, obtains higher power generation benefit. 3. The biomass unit module of the utility model is independently grid-connected to generate electricity, meets the requirements of national industrial policy, and has the advantages of simple environment-friendly electricity metering and convenient application compared with gasification coupling power generation technology; meanwhile, the biomass thermoelectric unit is different from a gasification coupling power generation technology, is used for direct combustion power generation, and is independent from the combustion of a 300MW thermoelectric unit hearth without mutual interference. 4. The utility model discloses a plurality of systems of living beings unit module and 300MW thermoelectric unit sharing, the rational utilization 300MW thermoelectric unit equipment system margin has improved thermal power plant heat supply capacity and flexibility simultaneously. 5. Flue gas that biomass unit burning produced utilizes 300MW thermoelectric power unit denitration, dust removal, desulfurization environmental protection equipment, easily reaches the ultra-clean emission requirement, the requirement of national environmental protection policy of adaptation that can be better. 6. The utility model discloses a biomass unit extraction of steam also can be as 300MW thermoelectric unit's well low pressure auxiliary steam or the reserve vapour source of industry extraction of steam, increases industry steam supply ability and system operation security, flexibility, has reduced power plant's start-up boiler and has maintained the running cost. In the aspect of production, operation and management, the number of fixed personnel can be reduced, the use efficiency of production consumables is improved, and the method has a very good application value. 7. The utility model discloses a biomass unit module is independent with 300MW thermal motor group partial system coupling operation, electricity generation, has improved enterprise economic benefits and social environmental protection benefit greatly.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
The reference numbers in the figures are as follows: 1. boiler, 2, steam turbine a, 3, generator a, 4, condenser a, 5, induced draft fan a, 6, denitration device, 7, dust remover, 8, desulfurizing tower, 9, chimney, 10, high plant transformer a, 11, biomass fluidized boiler, 12, steam turbine b, 13, generator b, 14, condenser b, 15, induced draft fan b, 16, heat network heater a, 17, heat network heater b, 18, heat network circulating pump a, 19, heat network circulating pump b, 20, high plant transformer b, 21, bus-coupled switch, 22, circulating water pump a, 23, cooling tower, 24, main transformer a, 25, chemical water treatment system, 26, return water pipeline, 27, water inlet pipeline, 28, pipeline a, 29, pipeline b, 30, pipeline c, 31, pipeline d, 32, pipeline e, 33, pipeline f, 34, isolation switching valve a, 35, isolation switching valve b, 36 and isolation switching valve c, 37. isolation switch valves d, 38, heat supply pipeline, 39, wet return, 40, main transformer b, 41, control switch b, 42, control switch d, 43, service circuit a, 44, service circuit b, 45, transmission line, 46, control valve a, 47, control valve b, 100, 300MW thermoelectric unit module, 200, living beings unit module, 300, heat supply pipe network module.
Detailed Description
The present invention will be further explained with reference to fig. 1:
a coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit comprises a 300MW thermoelectric unit module 100, a biomass unit module 200 and a heat supply pipe network module 300; the 300MW thermoelectric power unit module 100 comprises a denitration device 6 connected with a boiler 1, a desulfurization tower 8 connected with a draught fan a5 through a dust remover 7, a chimney 9 connected with the desulfurization tower 8, a steam turbine a2 connected with the boiler 1, a steam turbine a2 connected with a condenser a4 and a generator a3, a generator a3 connected with an external power grid through a main transformer a24 and a control switch a, a generator a3 connected with a plant power line a43 through a high plant transformer a10 and a control switch b41, a chemical water treatment system 25 connected with a condenser a4, a condenser a4 connected with a cooling tower 23 through a water inlet pipeline 27, and a circulating water pump a22 arranged on a water return pipeline 26 of the condenser a 4; the biomass unit module 200 comprises a biomass fluidized boiler 11 connected with the denitration device 6 through an induced draft fan b15, wherein the biomass fluidized boiler 11 is connected with a steam turbine b12, the steam turbine b12 is connected with a generator b13, the generator b13 is connected with an external power grid through a main transformer b40 and a control switch c, the generator b13 is connected with a plant power supply line b44 through a high plant power supply line b20 and a control switch d42, the plant power supply line b44 is connected with a plant power supply line a43 through a power transmission line 45, the power transmission line 45 is provided with a bus-bar switch 21, the steam turbine b12 is connected with a condenser b12, the condenser b12 is connected with a chemical water treatment system 25, a pipeline a 12 of the condenser b12 is connected with a pipeline c 12 and a pipeline e 12, a pipeline b12 connected with the condenser b12 is connected with a pipeline d 12 and a pipeline f 12, the pipeline c 12 is provided with an isolating switching valve and a switching valve 12 and an isolating switch valve respectively, an isolation switching valve c36 is arranged on the pipeline e32, and an isolation switching valve d37 is arranged on the pipeline f 33; the heat supply pipe network module 300 comprises a heat supply network heater b17 connected with a pipeline e32 and connected with a heat supply pipeline 38, the heat supply pipeline 38 is further connected with a heat supply network heater a16, a steam turbine a2 is connected with the heat supply network heater a16 and the heat supply network heater b17 through a control valve a46, a water return pipe 39 is connected with the heat supply network heater a16, a heat supply network circulating pump a18 and a control valve b47 are arranged on the water return pipe 39, a pipeline f33 is connected with the water return pipe 39, and a heat supply network circulating pump b19 is arranged on a pipeline f 33. The 300MW thermoelectric unit module 100 is a coal-fired subcritical, supercritical or ultra supercritical cogeneration unit. The biomass unit module 200 is a cogeneration unit of a direct combustion biomass fluidized bed boiler.
The working method of the coupling system of the biomass thermoelectric unit and the 300MW thermoelectric unit comprises a working method of power generation in a non-heating season and a working method of heat supply in a heating season;
the working method for generating power in the non-heating season comprises the following steps:
a1, after work of a turbine b12 of the biomass unit module 200, waste steam exchanges heat with circulating water in a condenser b14, the circulating water enters a water cooling tower 23 through a pipeline a28, a pipeline c30, an isolation switching valve a34 and a water inlet pipeline 27 to release heat, and cold water after heat exchange returns to the condenser b14 through a circulating water pump a22, a water return pipeline 26, a pipeline d31, an isolation switching valve b35 and a pipeline b 29;
a2, sucking flue gas generated by combustion of a biomass fluidized bed boiler into a tail flue of a 300MW thermoelectric unit module 100 by a draught fan b15, sucking the flue gas by a draught fan a5, passing through a denitration device 6, a dust remover 7 and a desulfurization tower 8, and exhausting the flue gas into the atmosphere by a chimney 9 when the flue gas reaches an ultra-clean emission standard;
a3 and a control switch c are closed, a control switch d42 is opened, a bus tie switch 21 is closed, the service power line a43 is communicated with the service power line b44 through a power transmission line 45, the control switch a is opened, the control switch b41 is opened, a generator a3 of the 300MW thermoelectric unit module 100 only supplies power to the service power system, and a generator b13 of the biomass unit module 200 generates power and is completely connected to a power grid;
a4 and a biomass unit condenser b14 are used for supplementing water and are supplied by a 300MW thermoelectric unit chemical water treatment system 25;
the working method for supplying heat in the heating season comprises the following steps:
b1, in the initial stage and the final stage of heating, closing a control valve a46 and a control valve B47, boosting the pressure of return water of a return water pipe 39 by a heat supply network circulating pump B19, feeding the return water into a condenser B14 by a pipeline f33, an isolation switching valve d37 and a pipeline B29, exchanging heat of exhaust steam after the return water and a turbine B12 of the biomass unit module 200 work in the condenser B14, and feeding the waste heat circulating water after heat exchange into a heat supply pipeline 38 by a pipeline a28, an isolation switching valve c36, a pipeline e32 and a heat supply network heater B17;
b2, in the middle stage of heating, the control valve a46 and the control valve B47 are both opened, one path of return water of the return water pipe 39 is pumped into the condenser B14 through the heat network circulating pump B19, after the turbine B12 of the biomass unit module 200 works, the exhaust steam exchanges heat with one path of return water of the return water pipe 39 in the condenser B14 to form waste heat circulating water, the waste heat circulating water enters the heat network heater B17, exchanges heat with the extracted steam of the turbine a2 in the heat network heater B17 and then enters the heat supply pipeline 38, the other path of return water of the water pipeline 39 enters the heat network heater a16 through the heat network circulating pump a18, and exchanges heat with the extracted steam of the turbine a2 of the 300MW thermoelectric unit module 100 in the heat network heater a16 and then enters the heat supply. In the initial stage and the final stage of heating, the temperature of the waste heat circulating water entering the heat supply pipeline 38 is 50-60 ℃.
Examples
The utility model discloses 300MW thermoelectric unit 100 module uses 300MW grade unit as the basis, is applicable to subcritical, supercritical and ultra supercritical combined heat and power generation unit production module 100 above 300MW equally.
In the 300MW thermoelectric unit module 100, fuel is combusted in a boiler 1 to heat water, generated high-temperature and high-pressure steam pushes a steam turbine a2 to rotate at a high speed and drives a coaxially connected generator a3 to generate electricity, exhausted steam after work enters a condenser a4, the exhausted steam exchanges heat with circulating water in the condenser a4 to be condensed, and then the temperature and the pressure are raised and the supplied to the boiler 1 to form a complete thermodynamic cycle system; the fuel burns in the boiler 1 to produce flue gas, is sucked by a draught fan a5 and enters a tail flue, passes through a denitration device 6, a dust remover 7 and a desulfurizing tower 8, reaches the requirement of ultra-clean emission standard, and is discharged to the atmosphere through a chimney 9 to form a complete flue gas system; the circulating water after heat exchange is cooled by heat released by the water cooling tower 23 and is sent back to the condenser a4 by the circulating water pump a22 to form a complete exhaust steam cooling system.
In the heating season, the heat supply pipe network module 300 sends the backwater after the heating heat exchange of residents to the heat supply pipe network heater a16 through the heat supply pipe network circulating water pump a18, the heat supply pipe network heater a16 and the steam turbine a2 perform steam extraction heat exchange to heat, the heated heat supply pipe network circulating water is supplied to the residents for heat exchange, and the closed circulation of the heat supply system is formed.
In the biomass unit module 200, biomass fuel is combusted in the biomass fluidized boiler 11 to heat water, the generated high-temperature and high-pressure steam pushes the steam turbine b12 to rotate at a high speed and drives the coaxially connected generator b13 to generate electricity, and the exhausted steam after work enters the condenser b 14; the biomass fuel is combusted in the biomass fluidized boiler 11 to generate flue gas, and the flue gas is sucked and discharged by the induced draft fan b15 to form a complete flue gas system.
In a non-heating season, the biomass unit module 200 sends the circulating water after the steam exhaust of the steam turbine b12 to the water cooling tower 23 of the 300MW thermoelectric unit module 100 by using an isolation switching valve to release heat; the flue gas generated by the combustion of the biomass fluidized boiler 11 is pumped by an induced draft fan b15 and sent to a tail flue of the boiler 1, and is exhausted into the atmosphere by a chimney 9 after passing through a denitration device 6, a dust remover 7 and a desulfurizing tower 8 and reaching the ultra-clean emission standard; the factory power system of the biomass unit module 200 is supplied by the 300MW thermal power plant factory power system through the bus-tie switch 21, so that the biomass unit module 200 can generate power and is completely connected to the internet; the production water of the biomass unit module 200 is supplied by the chemical water treatment system 25 of the 300MW thermoelectric unit module 100, so that the coupling of the biomass unit and partial systems of the 300MW thermoelectric unit 100 is realized, and the grid-connected power generation is independent.
In the heating season, the isolation switching valve isolates the waste heat circulating water after the biomass unit module 200 cools the steam turbine b12 exhaust steam from the circulating water of the 300MW thermoelectric unit module 100 and the water cooling tower 23, the waste heat circulating water is sent to the heat supply network heater b17 by the heat supply network circulating water pump b19, and after the heat supply network heater b17 and the steam turbine a2 extract steam for heat exchange, the waste heat circulating water is sent to the resident heating water supply pipeline, so that the heating capacity and flexibility of the thermoelectric plant are improved.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A coupling system of a biomass thermoelectric unit and a 300MW thermoelectric unit is characterized by comprising a 300MW thermoelectric unit module (100), a biomass unit module (200) and a heat supply pipe network module (300);
the 300MW thermal power unit module (100) comprises a denitration device (6) connected with a boiler (1), a desulfurization tower (8) is connected with an induced draft fan a (5) through a dust remover (7), the desulfurization tower (8) is connected with a chimney (9), the boiler (1) is connected with a steam turbine a (2), the steam turbine a (2) is connected with a condenser a (4) and a generator a (3), the generator a (3) is connected with an external power grid through a main transformer a (24) and a control switch a, the generator a (3) is connected with a service power line a (43) through a high-rise transformer a (10) and a control switch b (41), a chemical water treatment system (25) is connected with the condenser a (4), the condenser a (4) is connected with a water cooling tower (23) through a water inlet pipeline (27), and a circulating water pump a (22) is arranged on a water return pipeline (26) of the condenser a (4);
the biomass unit module (200) comprises a biomass fluidized boiler (11) connected with a denitration device (6) through an induced draft fan b (15), wherein a steam turbine b (12) is connected with the biomass fluidized boiler (11), the steam turbine b (12) is connected with a generator b (13), the generator b (13) is connected with an external power grid through a main transformer b (40) and a control switch c, the generator b (13) is connected with a power plant electric line b (44) through a high-power plant transformer b (20) and a control switch d (42), the power plant electric line b (44) is connected with a power plant electric line a (43) through an electric transmission line (45), a bus coupler switch (21) is arranged on the electric transmission line (45), the steam turbine b (12) is connected with a condenser b (14), the condenser b (14) is connected with a chemical water treatment system (25), and a pipeline a (28) of the condenser b (14) is connected with a pipeline c (30) and a pipeline e (32), a pipeline b (29) connected with the condenser b (14) is connected with a pipeline d (31) and a pipeline f (33), the pipeline c (30) is connected with a water inlet pipeline (27), the pipeline d (31) is connected with a water return pipeline (26), an isolation switching valve a (34) and an isolation switching valve b (35) are respectively arranged on the pipeline c (30) and the pipeline d (31), an isolation switching valve c (36) is arranged on the pipeline e (32), and an isolation switching valve d (37) is arranged on the pipeline f (33);
heat supply pipe network module (300) include, with heat supply pipe (38) are connected in heat supply network heater b (17) that pipeline e (32) are connected, heat supply pipe (38) are still connected heat supply network heater a (16), and steam turbine a (2) are connected heat supply network heater a (16) and heat supply network heater b (17) through control valve a (46), and heat supply network heater a (16) are connected in wet return (39), are equipped with heat supply network circulating pump a (18) and control valve b (47) on wet return (39), and wet return (39) are connected in pipeline f (33), are equipped with heat supply network circulating pump b (19) on pipeline f (33).
2. The coupling system of biomass thermoelectric power plant and 300MW thermoelectric power plant according to claim 1, wherein the 300MW thermoelectric power plant module (100) is a coal fired subcritical, supercritical or ultra supercritical cogeneration power plant.
3. The coupling system of biomass-based thermoelectric power generation unit and 300 MW-based thermoelectric power generation unit of claim 1, wherein the biomass-based thermoelectric power generation unit module (200) is a direct-fired biomass-based fluidized bed boiler cogeneration unit.
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| CN111023225A (en) * | 2019-12-25 | 2020-04-17 | 华能营口热电有限责任公司 | Coupling method of biomass thermoelectric unit and 300MW thermoelectric unit system |
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