CN112013372A - Biomass boiler power generation system - Google Patents
Biomass boiler power generation system Download PDFInfo
- Publication number
- CN112013372A CN112013372A CN202010821072.8A CN202010821072A CN112013372A CN 112013372 A CN112013372 A CN 112013372A CN 202010821072 A CN202010821072 A CN 202010821072A CN 112013372 A CN112013372 A CN 112013372A
- Authority
- CN
- China
- Prior art keywords
- air
- steam
- primary air
- inlet
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a biomass boiler power generation system, which comprises: the boiler comprises a boiler body and a steam drum, the boiler body is provided with a hearth and a primary air chamber positioned at the bottom of a grate, the economizer is arranged in a tail flue of the boiler and connected between the steam drum and the water supply device, the air preheater is provided with an air inlet and an air outlet, the air inlet of the air preheater is connected with the air supply device, the air outlet of the air preheater is connected with the primary air chamber and connected with the hearth, and the primary air reheater is connected in series in a primary air path between the air outlet of the air preheater and the primary air chamber and used for reheating and heating another part of air preheated by the air preheater and supplying the air into the primary air chamber as primary air. The invention can improve the drying capacity and the combustion-supporting capacity of primary air of the boiler, save the flow of heating steam and improve the overall efficiency of the unit.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a biomass boiler power generation system.
Background
Coal-fired boilers are widely used power generation boilers. However, with the increasing greenhouse effect, the emission reduction of carbon dioxide becomes the option of improving the environmental climate, and the biomass fuel is used as the fuel of the boiler for combustion power generation, so that the near zero emission of carbon dioxide can be realized, and the environment-friendly benefit is higher. Besides common biomass fuels such as straws and the like, garbage, particularly household garbage, also belongs to the category of biomass fuels, more and more garbage causes huge pressure on the environment, and the garbage is utilized to generate electricity, so that waste can be changed into valuable, and the garbage power generation is widely popularized. However, coal-fired boilers are not suitable for burning biomass fuels because the properties of biomass fuels are very different compared to coal.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the coal-fired boiler mainly uses the suspension combustion of pulverized coal, the fluctuation of the fuel characteristics is not large, and the combustion control of the fuel is easy. In contrast, biomass fuel has a low calorific value, a large difference in fuel composition, and the moisture, ash and calorific value of the fuel are frequently changed, resulting in complicated combustion control, and thus coal-fired boilers are not suitable for combusting biomass fuel.
In the related technology, biomass fuel is mainly combusted by two types of small boilers, namely a grate boiler and a circulating fluidized bed boiler, and air is preheated and then is respectively fed into a hearth of the boiler and the bottom of a grate. The inventor finds and recognizes through research that the temperature of hot air supplied into a biomass boiler is generally not higher than 200 ℃ and far lower than that of hot air of a large boiler, and the problems of difficult ignition and burnout in a furnace chamber exist, and particularly when the moisture content of biomass fuel is large and the calorific value is low (such as domestic garbage), the combustion efficiency is greatly reduced, and the thermal efficiency of the boiler is influenced. Therefore, in consideration of the characteristics of the biomass fuel, compared with the process flow of the coal-fired boiler in which primary air is supplied to a coal mill to heat pulverized coal and then the pulverized coal is supplied to a hearth, the biomass boiler needs to raise and regulate the temperature of the primary air sent to the bottom of the grate of the biomass boiler again to realize the combustion regulation and control of the biomass fuel with different characteristics.
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the embodiment of the invention provides a biological boiler power generation system which can improve the drying capacity and the combustion-supporting capacity of primary air of a boiler, fully play the role of high-temperature primary air, save the flow of heating steam, improve the heating efficiency of a high-pressure heater, improve the overall efficiency of a unit and realize energy conservation.
According to the biomass boiler power generation system of the embodiment of the invention, the biomass boiler power generation system comprises: a steam turbine; the boiler comprises a boiler body and a steam drum, wherein the boiler body is provided with a hearth and a primary air chamber positioned at the bottom of a grate; a water supply device; the economizer is arranged in a tail flue of the boiler, is connected between the steam pocket and the water supply device and is used for heating water supplied by the water supply device and supplying the heated water to the steam pocket; an air supply device; the air preheater is provided with an air inlet and an air outlet, the air inlet of the air preheater is connected with the air supply device, the air outlet of the air preheater is connected with the primary air chamber through a primary air path and is connected with the hearth through a secondary air path, and the air preheater supplies a part of preheated air into the hearth as secondary air; and the primary air reheater is connected in series in a primary air path between an air outlet of the air preheater and the primary air chamber and used for reheating and heating the other part of air preheated by the air preheater and supplying the air to the primary air chamber as primary air.
According to the biomass boiler power generation system provided by the embodiment of the invention, the primary hot air at the outlet of the air preheater is heated again, so that the primary air temperature can be greatly increased, the primary air drying capacity and the combustion-supporting capacity of the boiler are improved, only the primary air is subjected to temperature increase, the heating steam flow can be saved, and the effect of the high-temperature primary air is fully exerted.
In some embodiments, the biomass boiler power generation system further comprises a first high-pressure heater, the steam inlet of the primary air reheater is connected with the section of steam extraction port of the steam turbine, and the steam outlet of the primary air reheater is connected with the steam inlet of the first high-pressure heater.
In some embodiments, the biomass boiler power generation system further comprises a section of steam extraction check valve connected in series between the steam inlet of the primary wind reheater and the section of steam extraction port of the steam turbine, and a heating steam inlet shutoff valve connected in series between the section of steam extraction check valve and the steam inlet of the primary wind reheater, and a heating steam outlet shutoff valve connected in series between the steam outlet of the primary wind reheater and the steam inlet of the primary wind reheater.
In some embodiments, the biomass boiler power generation system further comprises a section of main steam extraction path shutoff valve and a section of main steam extraction path adjusting valve, one end of the section of main steam extraction path shutoff valve is connected between the section of steam extraction check valve and the heating steam inlet shutoff valve, the other end of the section of main steam extraction path shutoff valve is connected with the steam inlet of the first high-pressure heater, and the section of main steam extraction path adjusting valve is connected in series between the section of main steam extraction path shutoff valve and the steam inlet of the first high-pressure heater.
In some embodiments, the biomass boiler power generation system has a section extraction non-modulating mode and a section extraction modulating mode, wherein in the section extraction non-modulating mode, the section extraction check valve, the heating steam inlet shutoff valve and the heating steam outlet shutoff valve are open, and the section extraction main path shutoff valve and the section extraction main path damper valve are closed; in the first-stage steam extraction adjustment mode, the first-stage steam extraction check valve, the heating steam inlet shutoff valve, the heating steam outlet shutoff valve, the first-stage steam extraction main path shutoff valve and the first-stage steam extraction main path adjusting valve are all opened.
In some embodiments, the biomass boiler power generation system further comprises a primary air plenum regulating valve in series between the primary air reheater and the primary air plenum, and a feedwater regulating valve in series between the feedwater device and the economizer.
In some embodiments, the biomass boiler power generation system further comprises a low-temperature economizer arranged in a tail flue of the boiler, the air preheater is provided with a water inlet and a water outlet, the water inlet of the air preheater is connected with the water outlet of the water supply device, the water outlet of the air preheater is connected with the water inlet of the low-temperature economizer, and the water outlet of the low-temperature economizer is connected between the economizer and the water supply device.
In some embodiments, a water supply bypass shutoff valve is connected between the water inlet of the air preheater and the water outlet of the water supply device.
In some embodiments, the air preheater is disposed within a back pass of the boiler.
In some embodiments, the air preheater is a tubular heat exchanger.
Drawings
FIG. 1 is a schematic diagram of a biomass boiler power generation system according to an embodiment of the invention.
FIG. 2 is a schematic diagram of a biomass power generation system according to another embodiment of the invention.
Reference numerals:
the system comprises a hearth 1, a steam pocket 2, an economizer 3, a low-temperature economizer 4, a primary air chamber 5, a water supply device 6, an air supply device 7, an air preheater 8, a primary air reheater 9, a first high-pressure heater 10, a steam turbine 11, a water supply regulating valve 12, a water supply bypass shutoff valve 13, a primary air reheater bypass shutoff valve 14, a primary air chamber regulating valve 15, a section of steam extraction check valve 16, a section of main steam extraction path shutoff valve 17, a section of main steam extraction path regulating valve 18, a heating steam inlet shutoff valve 19 and a heating steam outlet shutoff valve 20.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1, a biomass boiler power generation system according to an embodiment of the present invention includes: a steam turbine 11, a boiler, a water supply device 6, an economizer 3, an air supply device 7, an air preheater 8 and a primary air reheater 9.
The boiler comprises a boiler body and a steam pocket 2, the boiler body is provided with a hearth 1 and a primary air chamber 5 positioned at the bottom of a grate, and the primary air chamber 5 is communicated with the hearth 1.
The economizer 3 is arranged in a tail flue of the boiler, the tail flue of the boiler is communicated with the hearth 1, the economizer 3 is connected between the steam pocket 2 and the water supply device 6, and the economizer 3 is used for heating water supplied by the water supply device 6 and then supplying the heated water to the steam pocket 2.
The air preheater 8 is provided with an air inlet and an air outlet, the air inlet of the air preheater 8 is connected with the air supply device 7, the air outlet of the air preheater 8 is connected with the primary air chamber 5 through a primary air path and is connected with the hearth 1 through a secondary air path, and the air preheater 8 supplies a part of preheated air into the hearth 1 as secondary air.
The primary air reheater 9 is connected in series in a primary air path between an air outlet of the air preheater 8 and the primary air chamber 5, and the primary air reheater 9 is used for reheating and heating another part of air preheated by the air preheater 8 and supplying the air as primary air into the primary air chamber 5.
According to the biomass boiler power generation system provided by the embodiment of the invention, the primary air at the outlet of the air preheater is heated again, so that the temperature of the primary air can be greatly increased, the drying capacity and the combustion-supporting capacity of the primary air of the boiler are improved, the temperature of the primary air is increased only, the heating steam flow can be saved, and the effect of the high-temperature primary air is fully exerted.
In some embodiments, the biomass boiler power generation system further comprises a first high-pressure heater 10, the steam inlet of the primary air reheater 9 is connected with a section of steam extraction port of a steam turbine 11, and the steam outlet of the primary air reheater 9 is connected with the steam inlet of the first high-pressure heater 10. Superheated steam is extracted from a steam turbine 11 and enters a primary air reheater 9 to heat primary air, the temperature of the primary air is increased, and superheated steam discharged from a steam outlet of the primary air reheater 9 enters a first high-pressure heater 10 to be used for heating water supply, so that energy consumption is reduced, and the utilization rate of energy is increased.
In some embodiments, the biomass boiler power generation system further includes a section of steam extraction check valve 16 and a heating steam inlet shutoff valve 19, the section of steam extraction check valve 16 is connected in series between the steam inlet of the primary air reheater 9 and a section of steam extraction port of the steam turbine 11, the heating steam inlet shutoff valve 19 is connected in series between the section of steam extraction check valve 16 and the steam inlet of the primary air reheater 9, and the heating steam outlet shutoff valve 20 is connected in series between the steam outlet of the primary air reheater 9 and the steam inlet of the first high pressure heater 10. Through the switching of control heating steam entry shutoff door 19, can control whether the superheated steam that steam turbine 11 extracted heats primary air reheater 9, when heating steam entry shutoff door 19 opened, extract superheated steam from steam turbine 11 and get into primary air reheater 9, heat primary air, improve the temperature of primary air, the superheated steam who discharges from the steam outlet of primary air reheater 9 gets into a high pressure feed water heater 10, be used for heating the feedwater, thereby energy resource consumption has been reduced, the utilization ratio of the energy has been improved.
In some embodiments, the biomass boiler power generation system further includes a section of main steam extraction shut-off door 17 and a section of main steam extraction regulating door 18, one end of the section of main steam extraction shut-off door 17 is connected between the section of steam extraction check door 16 and the heating steam inlet shut-off door 19, the other end of the section of main steam extraction shut-off door 17 is connected to the steam inlet of the first high-pressure heater 10, and the section of main steam extraction regulating door 18 is connected in series between the section of main steam extraction shut-off door 17 and the steam inlet of the first high-pressure heater 10. Superheated steam extracted from the steam turbine 11 enters the first high-pressure heater 10 through the first section of main steam extraction path shutoff valve 17 and the first section of main steam extraction path regulating valve 18 and is used for heating the water supply of the boiler, whether the open-close control of the first section of main steam extraction path shutoff valve 17 heats the water supply in the first high-pressure heater 10 through the superheated steam extracted from the steam turbine 11 or not can be controlled by controlling the opening degree of the first section of main steam extraction path regulating valve 18, the steam flow entering the first high-pressure heater 10 is regulated, the effect of regulating the water supply temperature is achieved, and the constancy of the water supply temperature of the boiler can be further ensured.
In some embodiments, the biomass boiler power generation system has a one-stage steam extraction non-regulation mode and a one-stage steam extraction regulation mode, wherein in the one-stage steam extraction non-regulation mode, the one-stage steam extraction check valve 16, the heating steam inlet shutoff valve 19, and the heating steam outlet shutoff valve 20 are opened, and the one-stage steam extraction main path shutoff valve 17 and the one-stage steam extraction main path regulation valve 18 are closed. Superheated steam extracted from the steam turbine 11 enters the primary air reheater 9 through the first-stage steam extraction check valve 16 and the heating steam inlet shutoff valve 19 to heat primary air, so that the temperature of the primary air is increased, and superheated steam discharged from a steam outlet of the primary air reheater 9 enters the first high-pressure heater 10 through the heating steam outlet shutoff valve 20 to be used for heating water supply.
In the first-stage steam extraction non-adjustment mode, because the first-stage steam extraction flow of the steam turbine 11 is kept unchanged, when the heat load of the primary air reheater 9 is increased, the heat load of the corresponding first high-pressure heater 10 is reduced, the water supply temperature of the boiler is reduced, and therefore the exhaust gas temperature of the boiler and the corresponding hot air temperature are adjusted.
In the first-stage steam extraction adjustment mode, the first-stage steam extraction check valve 16, the heating steam inlet shutoff valve 19, the heating steam outlet shutoff valve 20, the first-stage steam extraction main path shutoff valve 17 and the first-stage steam extraction main path regulating valve 18 are all opened. Superheated steam extracted from a steam turbine 11 passes through a section of steam extraction check valve 16 and then is divided into two paths, one path of superheated steam enters a primary air reheater 9 through a heating steam inlet shutoff valve 19 to heat primary air, the temperature of the primary air is increased, and superheated steam discharged from a steam outlet of the primary air reheater 9 enters a first high-pressure heater 10 through a heating steam outlet shutoff valve 20 to be used for heating water supply. The other path of superheated steam passes through the first section of main steam extraction path shutoff valve 17 and the first section of main steam extraction path adjusting valve 18, is mixed with one path of superheated steam discharged through the heating steam outlet shutoff valve 20, and then enters the first high-pressure heater 10 together for heating water supply.
Under the first-stage steam extraction adjustment mode, the steam temperature is reduced after passing through the primary air reheater 9, in order to meet the load requirement of the first high-pressure heater 10, the flow can be automatically adjusted in the first-stage steam extraction mode of the steam turbine, the corresponding first-stage steam extraction amount is increased, namely, the opening size of the adjusting valve 18 of the first-stage main steam extraction path is adjusted, the corresponding first-stage steam extraction amount is increased, the steam flow entering the first high-pressure heater 10 is adjusted, the effect of adjusting the outlet of the first high-pressure heater 10 is achieved, the heating load requirement of the first high-pressure heater 10 is met, and the temperature of the water supply at the outlet of the boiler is ensured to be unchanged.
In some embodiments, the biomass boiler power generation system further comprises a primary air chamber regulating valve 15 and a water supply regulating valve 12, the primary air chamber regulating valve 15 is connected in series between the primary air reheater 9 and the primary air chamber 5, and the water supply regulating valve 12 is connected in series between the water supply device 6 and the economizer 3. The primary air chamber adjusting valve 15 is used for adjusting the air quantity of primary air entering the primary air chamber 5, and the water supply adjusting valve 12 is used for adjusting the water supply quantity of the boiler.
In some embodiments, the biomass boiler power generation system further comprises a low-temperature economizer 4 arranged in a tail flue of the boiler, the air preheater 8 is provided with a water inlet and a water outlet, the water inlet of the air preheater 8 is connected with the water outlet of the water supply device 6, the water outlet of the air preheater 8 is connected with the water inlet of the low-temperature economizer 4, and the water outlet of the low-temperature economizer 4 is connected between the economizer 3 and the water supply device 6. The low-temperature economizer 4 heats the feed water with the temperature reduced after the flue gas waste heat at the tail part of the boiler flows through the air preheater 8, and then sends the feed water into the economizer 3, so that the utilization rate of energy is improved, and the effect of energy conservation is achieved.
In some embodiments, a feed water bypass shut-off valve 13 is connected between the water inlet of the air preheater 8 and the water outlet of the water feed device 6. The water supply bypass is switched on and off by arranging the water supply bypass cut-off valve 13.
As shown in fig. 1, in some embodiments, the air preheater 8 is disposed outside the boiler, and is not subjected to the scouring and abrasion of the flue gas, so that the service life of the air preheater 8 and the stability of the system operation are improved, and when the air preheater 8 is disposed outside the boiler, the air preheater 8 is a feedwater air preheater.
As shown in FIG. 2, in some embodiments, the air preheater 8 is located in the back pass of the boiler. The air preheater 8 is used as the last stage heating surface of the boiler, and the waste heat of the flue gas is recycled to heat and supply air, so that the utilization rate of energy is improved, and the energy-saving effect is achieved.
Preferably, the air preheater 8 is a tubular air preheater. It is to be understood that the present application is not limited thereto.
In some embodiments, the number of the primary air chambers 5 is at least one, when the number of the primary air chambers 5 is greater than or equal to two, the adjacent primary air chambers 5 are independent from each other and are communicated with the furnace 1, and each primary air chamber 5 air inlet is provided with a matched primary air chamber adjusting valve 15 for independently controlling the air volume of each primary air chamber 5.
In some embodiments, a primary air reheater bypass shut-off valve 14 connected in parallel with the primary air reheater 9 is disposed between the air inlet and the air outlet of the primary air reheater 9, and is used to open the primary air reheater bypass shut-off valve 14 when the primary air reheater 9 fails or quits operation, so as to reduce resistance of the primary air system, reduce power consumption of the air supply device 7, and achieve the purpose of saving energy.
Some specific exemplary biomass boiler power generation systems according to the present invention are described below with reference to FIG. 1.
The biomass boiler power generation system according to the embodiment of the invention comprises a steam turbine 11, a boiler, a water supply device 6, an economizer 3, an air supply device 7, an air preheater 8, a primary air reheater 9 and a first high-pressure heater 10.
The boiler comprises a boiler body and a steam pocket 2, the boiler body is provided with a hearth 1 and a primary air chamber 5 positioned at the bottom of a grate, and the primary air chamber 5 is communicated with the hearth 1.
The economizer 3 is arranged in a tail flue of the boiler, the tail flue of the boiler is communicated with the hearth 1, the economizer 3 is connected between the steam pocket 2 and the water supply device 6, a water supply regulating valve 12 is connected between the economizer 3 and the water supply device 6 in series, and the economizer 3 is used for heating water supplied by the water supply device 6 and supplying the heated water to the steam pocket 2.
The air preheater 8 is a water supply type air preheater and is arranged outside the boiler, the air preheater 8 is provided with an air inlet and an air outlet, the air inlet of the air preheater 8 is connected with the air supply device 7, the air outlet of the air preheater 8 is connected with the primary air chamber 5 through a primary air path and is connected with the hearth 1 through a secondary air path, and the air preheater 8 supplies a part of preheated air into the hearth 1 as secondary air. The tail flue of the boiler is also internally provided with a low-temperature economizer 4, the air preheater 8 is also provided with a water inlet and a water outlet, the water inlet of the air preheater 8 is connected with the water outlet of the water supply device 6, a water supply bypass shutoff valve 13 is connected between the water inlet of the air preheater 8 and the water outlet of the water supply device 6, the water outlet of the air preheater 8 is connected with the water inlet of the low-temperature economizer 4, and the water outlet of the low-temperature economizer 4 is connected between the economizer 3 and a water supply regulating valve 12.
The primary air reheater 9 is connected in series in a primary air path between an air outlet of the air preheater 8 and the primary air chamber 5, the primary air reheater 9 is used for reheating and heating another part of air preheated by the air preheater 8 and supplying the air as primary air to the primary air chamber 5, a primary air chamber regulating valve 15 is arranged between the primary air reheater 9 and the primary air chamber 5, and a primary air reheater bypass shut-off valve 14 connected with the primary air reheater 9 in parallel is arranged between an air inlet and an air outlet of the primary air reheater 9.
The steam inlet of the primary air reheater 9 is connected with a section of steam extraction opening of the steam turbine 11, a section of steam extraction check valve 16 and a heating steam inlet shutoff valve 19 are connected in series between the steam inlet of the primary air reheater 9 and the section of steam extraction opening of the steam turbine 11, the heating steam inlet shutoff valve 19 is arranged between the section of steam extraction check valve 16 and the steam inlet of the primary air reheater 9, a section of main steam extraction path shutoff valve 17 is connected between the section of steam extraction check valve 16 and the heating steam inlet shutoff valve 19, a section of main steam extraction path regulating valve 18 is connected between the section of main steam extraction path shutoff valve 17 and the steam inlet of the first high-pressure heater 10, the steam outlet of the primary air reheater 9 is connected with the steam inlet of the first high-pressure heater 10, and a heating steam outlet shutoff valve 20 is connected in series between the steam outlet of the primary air reheater 9 and the steam inlet of the first high-pressure heater 10.
The operation of some specific exemplary biomass boiler power generation systems according to the present invention is described below with reference to FIG. 1.
The feed water sent into the boiler from the water supply device 6 is divided into two paths, namely a main feed water path and a bypass feed water path, the flow of the feed water in the main feed water path is adjusted through a feed water adjusting valve 12 to realize the feed water distribution to the main path, a feed water bypass cut-off valve 13 is arranged in the bypass feed water path to realize the feed water cut-off of the bypass feed water path, the feed water in the bypass feed water path is sent into a feed water type air preheater 8, the feed water with the temperature reduced enters a low-temperature economizer 4, the bypass feed water with the temperature increased by absorbing the waste heat of the flue gas at the tail part of the boiler is mixed with the main feed water and jointly enters the economizer 3 for heating, the feed water heated from the economizer 3 enters a steam pocket 2, and then the steam-.
The air supply from the outlet of the blower 7 firstly enters the water supply type air preheater 8, the air is heated by the water supply in the water supply bypass, the air supply after the temperature is raised is divided into two paths, one path is sent into the hearth 1 as secondary air and burnout air, the other path is sent into the primary air reheater 9 as primary air of the boiler, the air is heated by the superheated steam extracted from the steam turbine 11, the primary air after the temperature is raised again enters the primary air chamber 5 after the air quantity of the primary air chamber adjusting valve 15 is adjusted, a primary air reheater bypass shut-off valve 14 connected with the primary air reheater 9 in parallel is arranged between the air inlet and the air outlet of the primary air reheater 9, and the primary air reheater bypass shut-off valve 14 is opened when the primary air reheater 9 fails or quits the operation, so as to reduce the resistance of a primary air system and realize the reduction of the power consumption of the air supply device 7, the purpose of energy conservation is achieved.
Superheated steam extracted from a section of extraction opening of the steam turbine 11 passes through a section of extraction check valve 16 and then is divided into two paths, namely main path steam and bypass steam, the main path steam sequentially passes through a section of extraction main path shutoff valve 17 and a section of extraction main path adjusting valve 18 and then is mixed with the bypass steam to enter a first high-pressure heater 10 to heat boiler feed water; the bypass steam enters the primary air reheater 9 after passing through the heating steam inlet shutoff valve 19, primary air is heated, the temperature of the primary air is raised, the steam coming out of the primary air reheater 9 is superheated steam, and the superheated steam and the main steam are mixed after passing through the heating steam outlet shutoff valve 20 and then enter the first high-pressure heater 10 to heat boiler feed water.
Some specific exemplary biomass boiler power generation systems according to the present invention are described below with reference to FIG. 2.
Biomass boiler power generation system, comprising: the system comprises a steam turbine 11, a boiler, a water supply device 6, an economizer 3, an air supply device 7, an air preheater 8, a primary air reheater 9 and a first high-pressure heater 10.
The boiler comprises a boiler body and a steam pocket 2, the boiler body is provided with a hearth 1 and a primary air chamber 5 positioned at the bottom of a grate, and the primary air chamber 5 is communicated with the hearth 1.
The economizer 3 is arranged in a tail flue of the boiler, the tail flue of the boiler is communicated with the hearth 1, the economizer 3 is connected between the steam pocket 2 and the water supply device 6, a water supply regulating valve 12 is connected between the economizer 3 and the water supply device 6 in series, and the economizer 3 is used for heating water supplied by the water supply device 6 and supplying the heated water to the steam pocket 2.
The air preheater 8 is provided with an air inlet and an air outlet, the air inlet of the air preheater 8 is connected with the air supply device 7, the air outlet of the air preheater 8 is connected with the primary air chamber 5 through a primary air path and is connected with the hearth 1 through a secondary air path, and the air preheater 8 supplies a part of preheated air into the hearth 1 as secondary air. The air preheater 8 is a tubular air preheater and is arranged in a tail flue of the boiler, and the waste heat of the flue gas is recycled so as to heat and supply air.
The primary air reheater 9 is connected in series in a primary air path between an air outlet of the air preheater 8 and the primary air chamber 5, the primary air reheater 9 is used for reheating and heating another part of air preheated by the air preheater 8 and supplying the air as primary air to the primary air chamber 5, a primary air chamber regulating valve 15 is arranged between the primary air reheater 9 and the primary air chamber 5, and a primary air reheater bypass shut-off valve 14 connected with the primary air reheater 9 in parallel is arranged between an air inlet and an air outlet of the primary air reheater 9.
The steam inlet of the primary air reheater 9 is connected with a section of steam extraction opening of the steam turbine 11, a section of steam extraction check valve 16 and a heating steam inlet shutoff valve 19 are connected in series between the steam inlet of the primary air reheater 9 and the section of steam extraction opening of the steam turbine 11, the heating steam inlet shutoff valve 19 is arranged between the section of steam extraction check valve 16 and the steam inlet of the primary air reheater 9, a section of main steam extraction path shutoff valve 17 is connected between the section of steam extraction check valve 16 and the heating steam inlet shutoff valve 19, a section of main steam extraction path regulating valve 18 is connected between the section of main steam extraction path shutoff valve 17 and the steam inlet of the first high-pressure heater 10, the steam outlet of the primary air reheater 9 is connected with the steam inlet of the first high-pressure heater 10, and a heating steam outlet shutoff valve 20 is connected in series between the steam outlet of the primary air reheater 9 and the steam inlet of the first high-pressure heater 10.
The operation of some specific exemplary biomass boiler power generation systems according to the present invention will now be described with reference to FIG. 2.
The feed water fed from the water supply device 6 to the boiler is adjusted in flow rate by the feed water adjusting valve 12 to realize feed water distribution to the main path, and the feed water heated from the economizer 3 enters the steam drum 2 and then is subjected to steam-water circulation heating.
The air supply from the outlet of the blower 7 is sent into a tubular air preheater 8 to be heated by flue gas, the tubular air preheater 8 is arranged in a boiler flue at the lower part of an economizer 3 and used as the last stage heating surface of a boiler to recover the waste heat of the flue gas so as to heat the air supply, the air supply with the raised temperature is divided into two paths, one path is sent into a boiler hearth 1 to be used as secondary air and over-fire air, the other path is sent into a primary air reheater 9 as primary air of the boiler to be heated by superheated steam extracted from a steam turbine 11, the primary air with the temperature raised again enters a primary air chamber 5 after being adjusted by the air quantity of a primary air chamber adjusting valve 15, a primary air reheater bypass shutoff valve 14 connected with the primary air reheater 9 in parallel is arranged between the air inlet and the air outlet of the primary air reheater 9, and is used for opening the primary air reheater bypass shutoff valve 14 when the primary air reheater 9 fails, thereby reducing the resistance of the primary air system, realizing the reduction of the power consumption of the air supply device 7 and achieving the purpose of energy conservation.
Superheated steam extracted from a section of extraction opening of the steam turbine 11 passes through a section of extraction check valve 16 and then is divided into two paths, namely main path steam and bypass steam, the main path steam sequentially passes through a section of extraction main path shutoff valve 17 and a section of extraction main path adjusting valve 18 and then is mixed with the bypass steam to enter a first high-pressure heater 10 to heat boiler feed water; the bypass steam enters the primary air reheater 9 after passing through the heating steam inlet shutoff valve 19, primary air is heated, the temperature of the primary air is raised, the steam coming out of the primary air reheater 9 is superheated steam, and the superheated steam and the main steam are mixed after passing through the heating steam outlet shutoff valve 20 and then enter the first high-pressure heater 10 to heat boiler feed water.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A biomass boiler power generation system, comprising:
a steam turbine;
the boiler comprises a boiler body and a steam drum, wherein the boiler body is provided with a hearth and a primary air chamber positioned at the bottom of a grate;
a water supply device;
the economizer is arranged in a tail flue of the boiler, is connected between the steam pocket and the water supply device and is used for heating water supplied by the water supply device and supplying the heated water to the steam pocket;
an air supply device;
the air preheater is provided with an air inlet and an air outlet, the air inlet of the air preheater is connected with the air supply device, the air outlet of the air preheater is connected with the primary air chamber through a primary air path and is connected with the hearth through a secondary air path, and the air preheater supplies a part of preheated air into the hearth as secondary air;
and the primary air reheater is connected in series in a primary air path between an air outlet of the air preheater and the primary air chamber and used for reheating and heating the other part of air preheated by the air preheater and supplying the air to the primary air chamber as primary air.
2. The biomass boiler power generation system according to claim 1, further comprising a first high pressure heater, wherein the steam inlet of the primary air reheater is connected to a section of steam extraction port of the steam turbine, and the steam outlet of the primary air reheater is connected to the steam inlet of the first high pressure heater.
3. The biomass boiler power generation system according to claim 2, further comprising a section of steam extraction check valve connected in series between the steam inlet of the primary air reheater and the section of steam extraction port of the steam turbine, and a heating steam inlet shutoff valve connected in series between the section of steam extraction check valve and the steam inlet of the primary air reheater, wherein a heating steam outlet shutoff valve is connected in series between the steam outlet of the primary air reheater and the steam inlet of the first high pressure heater.
4. The biomass boiler power generation system according to claim 3, further comprising a section of main steam extraction path shutoff door and a section of main steam extraction path adjusting door, wherein one end of the section of main steam extraction path shutoff door is connected between the section of steam extraction check door and the heating steam inlet shutoff door, the other end of the section of main steam extraction path shutoff door is connected with the steam inlet of the first high-pressure heater, and the section of main steam extraction path adjusting door is connected in series between the section of main steam extraction path shutoff door and the steam inlet of the first high-pressure heater.
5. The biomass boiler power generating system according to claim 4, wherein the biomass boiler power generating system has a one-stage steam extraction non-regulation mode in which the one-stage steam extraction check valve, the heating steam inlet shutoff valve, and the heating steam outlet shutoff valve are open, and the one-stage steam extraction main path shutoff valve and the one-stage steam extraction main path regulating valve are closed, and a one-stage steam extraction regulation mode in which the one-stage steam extraction check valve, the heating steam inlet shutoff valve, the heating steam outlet shutoff valve, the one-stage steam extraction main path shutoff valve, and the one-stage steam extraction main path regulating valve are all open.
6. The biomass boiler power generation system of claim 1, further comprising a primary plenum damper valve in series between the primary air reheater and the primary plenum and a feedwater damper valve in series between the feedwater device and the economizer.
7. The biomass boiler power generating system according to any one of claims 1-6, further comprising a low-temperature economizer disposed in a back flue of the boiler, the air preheater having a water inlet and a water outlet, the water inlet of the air preheater being connected to the water outlet of the water supply device, the water outlet of the air preheater being connected to the water inlet of the low-temperature economizer, the water outlet of the low-temperature economizer being connected between the economizer and the water supply device.
8. The biomass boiler power generation system of claim 7, wherein a feed water bypass shutoff valve is connected between the water inlet of the air preheater and the water outlet of the water feed device.
9. The biomass boiler power generation system of any of claims 1-6, wherein the air preheater is disposed within a back pass of the boiler.
10. The biomass boiler power generation system of claim 9, wherein the air preheater is a tubular heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821072.8A CN112013372A (en) | 2020-08-14 | 2020-08-14 | Biomass boiler power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010821072.8A CN112013372A (en) | 2020-08-14 | 2020-08-14 | Biomass boiler power generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112013372A true CN112013372A (en) | 2020-12-01 |
Family
ID=73504670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010821072.8A Pending CN112013372A (en) | 2020-08-14 | 2020-08-14 | Biomass boiler power generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112013372A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503497A (en) * | 2020-11-10 | 2021-03-16 | 中国电力工程顾问集团东北电力设计院有限公司 | Combined cycle thermodynamic system based on coupling of light gas turbine and biomass direct-fired grate boiler |
| CN114183744A (en) * | 2021-10-15 | 2022-03-15 | 华北电力科学研究院有限责任公司 | Wind heating safety control system |
-
2020
- 2020-08-14 CN CN202010821072.8A patent/CN112013372A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112503497A (en) * | 2020-11-10 | 2021-03-16 | 中国电力工程顾问集团东北电力设计院有限公司 | Combined cycle thermodynamic system based on coupling of light gas turbine and biomass direct-fired grate boiler |
| CN114183744A (en) * | 2021-10-15 | 2022-03-15 | 华北电力科学研究院有限责任公司 | Wind heating safety control system |
| CN114183744B (en) * | 2021-10-15 | 2024-03-01 | 华北电力科学研究院有限责任公司 | Wind heating safety control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112013372A (en) | Biomass boiler power generation system | |
| CN109681898B (en) | Primary air heating temperature-regulating system of phase-change heat pipe type power plant | |
| CN109899780B (en) | Electric heating heat storage system of circulating fluidized bed boiler for cogeneration unit | |
| CN111450700A (en) | Wide load denitration of boiler and improvement wind temperature integration system | |
| CN110220182A (en) | A kind of biomass direct-fired energy-saving circulating fluidized bed superhigh-pressure high-temp reheated steam boiler | |
| CN110388637A (en) | A kind of energy-saving type boiler ultra-low load steady combustion system | |
| CN213611944U (en) | Be suitable for powder process system of high moisture coal kind | |
| CN107420933B (en) | Exhaust-heat primary air heat exchanger system for hot air powder feeding system of ball mill | |
| CN212537792U (en) | Biomass boiler power generation equipment | |
| CN103453540A (en) | Boiler | |
| CN108203604A (en) | The cement sensible heat recovery system and method for a kind of biomass gasification burning | |
| CN111486440A (en) | System and method for adjusting reheating steam temperature of W flame boiler by adopting flue gas recirculation | |
| CN111550758A (en) | High-capacity high-parameter waste incineration waste heat boiler | |
| CN114183923B (en) | Comprehensive utilization system of gas heat-conducting oil furnace and control method | |
| JPH01203802A (en) | Steam production system at high pressure and high temperature level | |
| CN208253642U (en) | Composite heating air preheater | |
| CN201351914Y (en) | Return material air supply system of circulating fluidized bed boiler | |
| CN208282151U (en) | An air heating device with flue gas pipe heat exchanger for boiler | |
| CN113294799A (en) | Hot primary air and air-powder mixture heat exchange system | |
| CN210320143U (en) | System for reducing boiler exhaust gas temperature and inhibiting low-temperature corrosion of air preheater | |
| CN210772097U (en) | Ultralow-load stable combustion system of energy-saving boiler | |
| CN208087552U (en) | A kind of cement sensible heat recovery system of biomass gasification burning | |
| CN210638067U (en) | Stable combustion energy-saving efficiency-improving system for boiler of thermal power plant | |
| CN103343954A (en) | Quality-improved lignite combustion or blending combustion system | |
| CN113685818A (en) | Combined combustion-supporting air heating system of garbage incinerator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |