CN212408626U - CFB boiler fast load and peak regulation system of pyrolysis combustion coupling - Google Patents
CFB boiler fast load and peak regulation system of pyrolysis combustion coupling Download PDFInfo
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- CN212408626U CN212408626U CN202020479772.9U CN202020479772U CN212408626U CN 212408626 U CN212408626 U CN 212408626U CN 202020479772 U CN202020479772 U CN 202020479772U CN 212408626 U CN212408626 U CN 212408626U
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Abstract
A CFB boiler rapid load and peak regulation system of pyrolysis combustion coupling relates to the field of fluidized bed boiler combustion regulation. The technical scheme comprises a fluidized bed combustion furnace, a fluidized bed pyrolysis furnace and the like; the fluidized bed combustion furnace is connected with the fluidized bed pyrolysis furnace through two connecting pipes, wherein one connecting pipe is used for connecting the outlet of the fluidized bed combustion furnace with the inlet of the fluidized bed pyrolysis furnace through a circulating ash pipe, and the other connecting pipe is used for connecting the outlet of the fluidized bed pyrolysis furnace with the inlet of the fluidized bed combustion furnace through a semicoke return pipe; the fluidized bed pyrolysis furnace, the pyrolysis gas purifier and the pyrolysis gas liquefaction separator are sequentially connected through a pyrolysis gas pipe; the pyrolysis gas liquefaction separator, the fuel gas storage tank and the circulating fan are connected in sequence through a fuel gas pipe; the circulating fan is connected with the combustor through a fuel gas pipe. The utility model discloses can improve CFB generating set fast rising load and peak regulation ability, both can reduce SO2、NOXThe emission can obtain more compensation of the paid auxiliary service of the power grid, and additional economic benefit is brought to the company.
Description
Technical Field
The utility model relates to a fluidized bed boiler combustion adjustment technical field especially relates to a CFB boiler quick adjustment load and peak shaving system of pyrolysis combustion coupling.
Background
In recent years, as the installed capacity of new energy such as solar energy and wind power generation is increased, the problems of power grid peak shaving and new energy power generation consumption are prominent. In order to improve the power consumption of the power grid for new energy power generation, the peak regulation capacity of a thermoelectric generator set in the power grid, particularly a circulating fluidized bed generator set, needs to be enhanced. However, the inherent large thermal inertia and slow fuel burning rate of circulating fluidized bed boilers cause their load change rates to be slow. At present, a large number of CFB units cannot meet the requirements of Automatic Generation Control (AGC) of a power grid, and no practical and effective solution is found all the time.
The power generation-based low-calorific-value coal pyrolysis combustion poly-generation system tightly combines a circulating fluidized bed boiler and a pyrolysis furnace, and realizes the joint production of heat, electricity, tar and pyrolysis gas in a set of system through a simple and advanced process. Wherein the polygeneration system is utilizing pyrolysis gas (rich in CH)4、CO、H2C2 and C3) to separate a large amount of fuel gas (rich in CO and H) in the process of preparing LNG2C2 and C3), while the pyrolysis gas and the fuel gas have the advantages of fast combustion rate, good regulation performance, less pollutants and the like, and are very suitable for regulating load and peak for boiler afterburning.
In order to improve the variable load rate of the CFB boiler, a large number of scholars start from the aspects of coordination control, combustion process, additional arrangement of energy storage equipment and the like, and research on improving the load change rate of the circulating fluidized bed is carried out. Although research has made a certain success in improving the load change rate of the boiler, the current CFB unit still cannot meet the requirement of power grid dispatching. Therefore, the utility model provides an utilize pyrolysis gas or fuel gas afterburning to realize quick lift load of boiler and peak regulation system.
SUMMERY OF THE UTILITY MODEL
The method aims to improve the rapid load lifting and peak load adjusting capacity of the CFB generator set and solve the problem that a power grid is insufficient in new energy power generation. The utility model provides a CFB boiler quick load regulation and peak shaving system of pyrolysis combustion coupling to satisfy the requirement of electric wire netting Automatic Generation Control (AGC) to the CFB boiler.
In order to solve the technical problem, the utility model discloses a technical scheme is: a pyrolytic combustion coupled CFB boiler fast load and peak shaving system wherein: the device comprises a fluidized bed combustion furnace, a fluidized bed pyrolysis furnace, a pyrolysis gas purifier, a pyrolysis gas liquefaction separator, a fuel gas storage tank, a circulating fan, an ignition burner, a coal bunker, a coal feeder, a fourth valve, a cooling air door and a burner;
the fluidized bed combustion furnace is connected with the fluidized bed pyrolysis furnace through two connecting pipes, wherein one connecting pipe is used for connecting the outlet of the fluidized bed combustion furnace with the inlet of the fluidized bed pyrolysis furnace through a circulating ash pipe, and the other connecting pipe is used for connecting the outlet of the fluidized bed pyrolysis furnace with the inlet of the fluidized bed combustion furnace through a semicoke return pipe; the fluidized bed pyrolysis furnace, the pyrolysis gas purifier and the pyrolysis gas liquefaction separator are sequentially connected through a pyrolysis gas pipe; the pyrolysis gas liquefaction separator, the fuel gas storage tank and the circulating fan are connected in sequence through a fuel gas pipe; the circulating fan is connected with the combustor through a fuel gas pipe; a second valve is arranged on a fuel gas pipeline between the pyrolysis gas liquefaction separator and the fuel gas storage tank, and a third valve and a first check valve are sequentially arranged on the fuel gas pipeline between the fuel gas storage tank and the circulating fan; a second check valve is arranged on the fuel gas pipe close to the circulating fan;
a fuel gas adjusting door is arranged on the fuel gas pipe close to the burner; the burners are arranged on four walls of the fluidized bed combustion furnace and are communicated with secondary air through cooling air doors; the fuel gas pipe between the second check valve and the fuel gas regulating valve is also connected with a primary air pipe connected with a fourth valve, and the fourth valve and the ignition burner are connected with a primary air port of the fluidized bed combustion furnace through the primary air pipe; the coal bunker and the coal feeder are connected with a coal feeding port of the fluidized bed combustion furnace through a pipeline; a branch pipeline is arranged on an outlet pipeline of the coal feeder and is connected with a coal feeding port of the fluidized bed pyrolysis furnace through the branch pipeline;
the burners are arranged in an upper layer and a lower layer, the lower layer is arranged between an upper secondary air port and a lower secondary air port of four walls of the fluidized bed combustion furnace, the upper layer is arranged above the upper secondary air port, two burners are arranged on each layer of the front wall and the rear wall, one burner is arranged on each layer of the left wall and the right wall, and partial secondary air is introduced into each burner through a cooling air door to serve as cooling air; an upper secondary air port connected with a secondary air pipe is arranged between the upper layer combustor and the lower layer combustor on the fluidized bed combustion furnace, and a lower secondary air port connected with the secondary air pipe is arranged below the lower layer combustor.
As a further description of the above technical solution:
a first valve for supplementing pyrolysis gas to the fuel gas storage tank is arranged between the outlet of the pyrolysis gas purifier and the inlet of the second valve through a pyrolysis gas pipe; the inlet of the second valve is in gas communication with an adjacent unit.
As a further description of the above technical solution:
the fuel gas storage tank is provided with a pressure gauge for monitoring the pressure of the fuel gas.
As a further description of the above technical solution:
and the outlet of the pyrolysis gas liquefaction separator is connected with an LNG working section.
As a further description of the above technical solution:
and primary air is connected between the fourth valve and the ignition burner.
As a further description of the above technical solution:
the cooling air door and the gas regulating door which are respectively arranged at the burner inlet can respectively regulate the cooling air quantity and the fuel gas quantity of each burner.
The utility model discloses a following regulation mode:
1. when the lifting load is below 20MW, the method adopts the means of mainly adjusting fuel gas (pyrolysis gas) and secondarily adjusting the coal supply amount to adjust;
2. when the lifting load is more than 20MW, the coal feeding quantity is mainly adjusted, and the fuel gas (pyrolysis gas) is adjusted as an auxiliary means for adjustment;
the utility model has the advantages that:
1. the fuel gas (pyrolysis gas) has high combustion rate and good regulation performance, can greatly improve the combustion rate compared with pulverized coal, can realize the quick regulation of the load of the boiler by using the fuel gas (pyrolysis gas) to supplement combustion for the boiler, meets the requirements of a power grid, obtains more compensated auxiliary service compensation of the power grid, and brings extra economic benefit for companies.
2. Because the fuel gas (pyrolysis gas) is purified and basically does not contain S, N and other pollutants, the combustion amount of pulverized coal is reduced by supplementing fuel gas (pyrolysis gas) to the boiler, and SO is correspondingly reduced2、NOXThe amount of discharge of (c).
3. Because the ignition temperature of the fuel gas (pyrolysis gas) is low, the combustion characteristic is good, and the fuel gas (pyrolysis gas) can be stably combusted even when the bed temperature is low, the load of the fluidized bed combustion furnace can be reduced to below 30 percent or even lower by utilizing the afterburning technology of the fuel gas (pyrolysis gas), and the peak regulation capacity of a unit is improved.
4. The fuel gas (pyrolysis gas) contains a large amount of reducing gases of CO and H2The secondary air is fed into the hearth through the upper and lower layers of burners, so that the secondary air is supplied in a grading manner, the fuel is combusted in a grading manner, the reducing area of the hearth is enlarged and prolonged, and NO is favorably generatedXAnd (4) controlling.
5. The system is rich in fuel gas (pyrolysis gas), so that the fuel gas (pyrolysis gas) can be used as fuel of the ignition burner instead of diesel oil at the starting stage of the unit or under low load, and the system is economical and environment-friendly.
Drawings
FIG. 1 is a system diagram of the present invention;
FIG. 2 is a schematic view of the arrangement of the burner of the present invention;
FIG. 3 is a schematic view of the arrangement of front and rear wall burners;
fig. 4 is a schematic view of the arrangement of the left and right wall burners.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, the present embodiment provides a system for fast load and peak load adjustment of a CFB boiler coupled with pyrolysis combustion, wherein: the device comprises a fluidized bed combustion furnace 1, a fluidized bed pyrolysis furnace 2, a pyrolysis gas purifier 3, a pyrolysis gas liquefaction separator 4, a fuel gas storage tank 5, a circulating fan 6, an ignition burner 7, a coal bunker 8, a coal feeder 9, a fourth valve 15, a cooling air door 16 and a burner 17;
the fluidized bed combustion furnace 1 is connected with the fluidized bed pyrolysis furnace 2 through two connecting pipes, wherein one connecting pipe is used for connecting the outlet of the fluidized bed combustion furnace 1 with the inlet of the fluidized bed pyrolysis furnace 2 through a circulating ash pipe, and the other connecting pipe is used for connecting the outlet of the fluidized bed pyrolysis furnace 2 with the inlet of the fluidized bed combustion furnace 1 through a semicoke return pipe; the fluidized bed pyrolysis furnace 2, the pyrolysis gas purifier 3 and the pyrolysis gas liquefaction separator 4 are sequentially connected through a pyrolysis gas pipe; the pyrolysis gas liquefaction separator 4, the fuel gas storage tank 5 and the circulating fan 6 are connected in sequence through a fuel gas pipe; the circulating fan 6 is connected with a combustor 17 through a fuel gas pipe; a second valve 11 is arranged on a fuel gas pipeline between the pyrolysis gas liquefaction separator 4 and the fuel gas storage tank 5, and a third valve 12 and a first check valve 13 are sequentially arranged on the fuel gas pipeline between the fuel gas storage tank 5 and the circulating fan 6; a second check valve 14 is arranged on a fuel gas pipe close to the circulating fan 6, and the arrangement of the first check valve 13 and the second check valve 14 is used for preventing accidents such as flue gas back-flowing and tempering when the pressure of a hearth of the fluidized bed combustion furnace is too high.
A fuel gas adjusting door 18 is arranged on a fuel gas pipe close to the combustor 17; the burner 17 is arranged on the four walls of the fluidized bed combustion furnace 1, and the burner 17 is communicated with secondary air through a cooling air door 16; the fuel gas pipe between the second check valve 14 and the fuel gas adjusting valve 18 is also connected with a primary air pipe connected with a fourth valve 15, and the fourth valve 15 and the ignition burner 7 are connected with a primary air port of the fluidized bed combustion furnace 1 through the primary air pipe; the coal bunker 8 and the coal feeder 9 are connected with a coal feeding port of the fluidized bed combustion furnace 1 through pipelines; a branch pipeline is arranged on an outlet pipeline of the coal feeder 9 and is connected with a coal feeding port of the fluidized bed pyrolysis furnace 2 through the branch pipeline;
the burners 17 are arranged in an upper layer and a lower layer, the lower layer is arranged between an upper secondary air port and a lower secondary air port of the four walls of the fluidized bed combustion furnace 1, the upper layer is arranged above the upper secondary air port, two burners 17 are arranged on each layer of the front wall and the rear wall, one burner 17 is arranged on each layer of the left wall and the right wall, and part of secondary air is introduced into each burner 17 through a cooling air door 16 to be used as cooling air; an upper secondary air port connected with a secondary air pipe is arranged between the upper layer combustor 17 and the lower layer combustor 17 on the fluidized bed combustion furnace 1, and a lower secondary air port connected with the secondary air pipe is arranged below the lower layer combustor 17 to prevent the combustor from being burnt out.
As a further description of the above technical solution:
a first valve 10 for supplementing pyrolysis gas to the fuel gas storage tank 5 is arranged between the outlet of the pyrolysis gas purifier 3 and the inlet of the second valve 11 through a pyrolysis gas pipe; the inlet of the second valve 11 is in air communication with an adjacent unit.
As a further description of the above technical solution:
and a pressure gauge 19 for monitoring the pressure of the fuel gas is arranged on the fuel gas storage tank 5.
As a further description of the above technical solution:
the outlet of the pyrolysis gas liquefaction separator 4 is connected with an LNG working section.
As a further description of the above technical solution:
primary air is connected between the fourth valve 15 and the ignition burner 7.
As a further description of the above technical solution:
the cooling air door 16 and the gas regulating door 18 which are respectively arranged at the inlet of the combustor 17 can respectively regulate the cooling air quantity and the fuel gas quantity of each combustor 17.
The utility model discloses the operation process of system:
the first process is as follows:
1. when the system stably operates, the fluidized bed combustion furnace stably burns to generate steam for power generation, the fluidized bed pyrolysis furnace generates pyrolysis gas, and the pyrolysis gas is purified by the pyrolysis gas purifier to obtain the gas rich in CH4、CO、H2Preparing LNG from the pyrolysis gas of C2 and C3 by a pyrolysis gas liquefaction separator, wherein the residual fuel gas for preparing LNG mainly comprises CO and H2And C2 and C3, the fuel gas enters the fuel gas storage tank for buffering, the first valve 10 is closed at the moment, and the opening degrees of the second valve 11 and the third valve 12 are adjusted by monitoring the pressure of the pressure gauge, so that the set pressure of the fuel gas storage tank is kept. The fuel gas from the fuel gas storage tank enters the combustor for combustion through the third valve 12, the first check valve 13, the second check valve 14 and the fuel gas regulating valve in sequence under the action of the circulating fan. And closing the fourth valve 15, and cutting off the connection between the fuel gas and the primary air pipe to stabilize the primary air quantity and the secondary air quantity. The output of the coal feeder is adjusted to ensure that the coal feeding amount is also stabilized at a proper amount. Under the stable working condition, the fuel gas is provided with 20MW-30MW load, and the adjustment is carried out according to the actual load requirement under the variable working condition.
2. When a power grid load-increasing instruction is received and the load-increasing amplitude is judged to be below 20MW, the fuel gas regulation load is taken as the main load and the coal supply quantity regulation is taken as the auxiliary load. Firstly, the frequency of a circulating fan is adjusted, the output is increased, meanwhile, each fuel gas adjusting door is opened, the primary air quantity and the secondary air quantity are properly increased, and the output of a coal feeder is increased. And at the moment, if the load-rise rate meets the requirement of the power grid, the working condition operation is stabilized. After the coal gas is stabilized for a while, the output of the fan is properly reduced, the opening of each gas regulating valve is reduced, meanwhile, the primary air quantity and the secondary air quantity are properly increased, the output of the coal feeder is increased, the output of the fan and the opening of each gas regulating valve are recovered to normal values, and the load is adjusted slowly and finely in the process, so that the load is always kept stable.
If the load-raising rate is less than the requirement of the power grid, the output of the fan is continuously increased, each fuel gas regulating door is opened, the primary air quantity and the secondary air quantity are continuously and properly increased, and the output of the coal feeder is increased. And stabilizing the working condition operation until the load-lifting rate meets the requirement of the power grid. And then repeating the process, recovering the output of the fan and the opening of each gas regulating valve to normal values, and always keeping the load stable.
If the fan output and the gas regulating valves are regulated to the maximum and the load-lifting rate is still less than the requirement of the power grid, the first valve 10 is opened urgently to enable the purified pyrolysis gas with higher heat value to enter the storage tank together with the fuel gas, at the moment, the mixed gas of the pyrolysis gas and the fuel gas in the system is afterburned to the combustion furnace, the load-lifting rate is accelerated, and the working condition operation is stabilized until the requirement of the power grid is met. And then repeating the process, recovering the output of the fan and the opening of each gas regulating valve to normal values, closing the first valve and keeping the load stable all the time.
If the load-raising rate is greater than the requirement of the power grid, the output of a large fan needs to be properly reduced, and all gas regulating valves need to be reduced. And stabilizing the working condition operation until the load-lifting rate meets the requirement of the power grid. And then repeating the process, recovering the output of the fan and the opening of each gas regulating valve to normal values, and always keeping the load stable.
3. When a load-increasing instruction of a power grid is received and the load-increasing amplitude is judged to be more than 20MW, the load is adjusted mainly by coal feeding amount and the fuel gas is adjusted secondarily. At the moment, the output of the fan and each fuel gas adjusting door are required to be opened to the maximum, then the primary air quantity and the secondary air quantity are increased rapidly and repeatedly in a proper amount, and the output of the coal feeder is increased. And repeating the process until the load-rise rate meets the requirement of the power grid, and stabilizing the working condition operation. And the output of the fan and the opening of each gas regulating valve are recovered to normal values, and the load is always kept stable.
And a second process:
1. when a load reduction instruction of the power grid is received and the load reduction amplitude is judged to be below 20MW, the fuel gas regulation load is taken as the main and the coal supply quantity regulation is taken as the auxiliary. Firstly, the frequency of the circulating fan is adjusted, the output is reduced, meanwhile, each fuel gas adjusting door is reduced, the primary air quantity and the secondary air quantity are properly reduced, and the output of a coal feeder is reduced. And at the moment, if the load shedding rate meets the requirement of the power grid, the working condition operation is stabilized. After the coal mine underground.
If the load reduction rate is less than the requirement of the power grid, the output of the fan is continuously reduced, all gas regulating valves are reduced, the primary air quantity and the secondary air quantity are continuously and properly reduced, and the output of the coal feeder is reduced. And stabilizing the working condition operation until the load-lifting rate meets the requirement of the power grid. And then repeating the process, recovering the output of the fan and the opening of each gas regulating valve to normal values, and always keeping the load stable.
If the load reduction rate is greater than the requirement of the power grid, the output of a large fan needs to be increased properly, and each fuel gas regulating valve needs to be increased. And stabilizing the working condition operation until the load-lifting rate meets the requirement of the power grid. And then repeating the process, recovering the output of the fan and the opening of each gas regulating valve to normal values, and always keeping the load stable.
2. When a load reduction instruction of the power grid is received and the load reduction amplitude is judged to be more than 20MW, the load adjustment of coal feeding is mainly used, and the fuel gas adjustment is assisted. At the moment, the fan needs to be stopped, all the gas regulating valves, the second valve 11 and the third valve 12 are closed, and then the primary air quantity and the secondary air quantity are reduced rapidly and repeatedly in a proper amount, so that the output of the coal feeder is reduced. And repeating the process until the load-rise rate meets the requirement of the power grid, and stabilizing the working condition operation. And the output of the fan and the opening of each gas regulating valve are recovered to normal values, and the load is always kept stable.
The third process:
when the power grid requires that the unit depth peak shaving is below 30% load, the valve 1 is fully opened, the output of the circulating fan is properly increased, the opening of each fuel gas regulating valve is increased, then the primary air quantity and the secondary air quantity are quickly and repeatedly reduced properly, and the output of a coal feeder is reduced. And stabilizing the operation under the working condition until the requirement of the power grid is met.
The process four is as follows:
when the fluidized bed combustion furnace is ignited and started, the adjacent units are switched on to supply gas, the second valve 11, the third valve 12 and the fourth valve 15 are opened, the output of the circulating fan and the opening of each gas regulating valve are adjusted to be proper, so that the ignition burner and the burner are normally put into operation and are ignited together from the upper part of the bed and the lower part of the bed, the temperature of the bed is quickly increased, and the starting time is shortened.
When the combustion condition of the fluidized bed combustion furnace is unstable or the load is too low and the combustion needs to be stabilized, the steps are repeated, and the combustion stabilizing effect can be quickly achieved.
The utility model discloses utilize fuel gas, pyrolysis gas among the pyrolysis burning polygeneration system to improve CFB generating set fast rising load and peak regulation ability to satisfy the requirement of electric wire netting Automatic Generation Control (AGC) to the CFB boiler, both can reduce SO2、NOXThe emission can obtain more compensation of the paid auxiliary service of the power grid, and additional economic benefit is brought to the company.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (6)
1. A CFB boiler fast load and peak shaving system of pyrolysis combustion coupling which characterized in that: the device comprises a fluidized bed combustion furnace (1), a fluidized bed pyrolysis furnace (2), a pyrolysis gas purifier (3), a pyrolysis gas liquefaction separator (4), a fuel gas storage tank (5), a circulating fan (6), an ignition burner (7), a coal bunker (8), a coal feeder (9), a fourth valve (15), a cooling air door (16) and a burner (17);
the fluidized bed combustion furnace (1) is connected with the fluidized bed pyrolysis furnace (2) through two connecting pipes, wherein one connecting pipe is used for connecting the outlet of the fluidized bed combustion furnace (1) with the inlet of the fluidized bed pyrolysis furnace (2) through a circulating ash pipe, and the other connecting pipe is used for connecting the outlet of the fluidized bed pyrolysis furnace (2) with the inlet of the fluidized bed combustion furnace (1) through a semicoke return pipe; the fluidized bed pyrolysis furnace (2), the pyrolysis gas purifier (3) and the pyrolysis gas liquefaction separator (4) are sequentially connected through a pyrolysis gas pipe; the pyrolysis gas liquefaction separator (4), the fuel gas storage tank (5) and the circulating fan (6) are sequentially connected through a fuel gas pipe; the circulating fan (6) is connected with the combustor (17) through a fuel gas pipe; a second valve (11) is arranged on a fuel gas pipeline between the pyrolysis gas liquefaction separator (4) and the fuel gas storage tank (5), and a third valve (12) and a first check valve (13) are sequentially arranged on the fuel gas pipeline between the fuel gas storage tank (5) and the circulating fan (6); a second check valve (14) is arranged on the fuel gas pipe close to the circulating fan (6), and a gas regulating valve (18) is arranged on the fuel gas pipe close to the combustor (17); the burner (17) is arranged on four walls of the fluidized bed combustion furnace (1), and the burner (17) is communicated with secondary air through a cooling air door (16); the fuel gas pipe between the second check valve (14) and the fuel gas adjusting valve (18) is also connected with a primary air pipe connected with a fourth valve (15), and the fourth valve (15) and the ignition burner (7) are connected with a primary air port of the fluidized bed combustion furnace (1) through the primary air pipe; the coal bunker (8) and the coal feeder (9) are connected with a coal feeding port of the fluidized bed combustion furnace (1) through pipelines; a branch pipeline is arranged on an outlet pipeline of the coal feeder (9) and is connected with a coal feeding port of the fluidized bed pyrolysis furnace (2) through the branch pipeline;
the burners (17) are arranged in an upper layer and a lower layer, the lower layer is arranged between an upper secondary air port and a lower secondary air port of the four walls of the fluidized bed combustion furnace (1), the upper layer is arranged on the upper secondary air port, two burners (17) are arranged on each layer of the front wall and the rear wall, one burner (17) is arranged on each layer of the left wall and the right wall, and part of secondary air is introduced into each burner (17) through a cooling air door (16) to be used as cooling air; an upper secondary air port connected with a secondary air pipe is arranged between the upper layer combustor (17) and the lower layer combustor (17) on the fluidized bed combustion furnace (1), and a lower secondary air port connected with the secondary air pipe is arranged below the lower layer combustor (17).
2. A pyrolytic combustion coupled CFB boiler fast load and peak shaver system in accordance with claim 1, wherein: a first valve (10) for supplementing pyrolysis gas to the fuel gas storage tank (5) is arranged between the outlet of the pyrolysis gas purifier (3) and the inlet of the second valve (11) through a pyrolysis gas pipe; the inlet of the second valve (11) is in gas communication with an adjacent unit.
3. A pyrolytic combustion coupled CFB boiler fast load and peak shaver system in accordance with claim 1, wherein: and a pressure gauge (19) for monitoring the pressure of the fuel gas is arranged on the fuel gas storage tank (5).
4. A pyrolytic combustion coupled CFB boiler fast load and peak shaver system in accordance with claim 1, wherein: an outlet of the pyrolysis gas-liquid separator (4) is connected with an LNG working section.
5. A pyrolytic combustion coupled CFB boiler fast load and peak shaver system in accordance with claim 1, wherein: primary air is connected between the fourth valve (15) and the ignition burner (7).
6. A pyrolytic combustion coupled CFB boiler fast load and peak shaver system in accordance with claim 1, wherein: and the cooling air door (16) and the gas regulating door (18) which are respectively arranged at the inlets of the combustors (17) can respectively regulate the cooling air volume and the fuel gas volume of each combustor (17).
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