CN218763375U

CN218763375U - Circulating fluidized bed boiler unit degree of depth peak shaving system

Info

Publication number: CN218763375U
Application number: CN202221803786.7U
Authority: CN
Inventors: 刘众元; 梁五洲; 刘志兵; 张屹峰; 王进; 武晓俊
Original assignee: State Grid Electric Power Research Institute Of Sepc
Current assignee: State Grid Electric Power Research Institute Of Sepc
Priority date: 2022-07-13
Filing date: 2022-07-13
Publication date: 2023-03-28
Anticipated expiration: 2032-07-13

Abstract

The utility model provides a circulating fluidized bed boiler unit degree of depth peak shaving system, including starting the bunker, the starting fuel that puts down the ignition point in the starting bunker, starting the bunker pass through fuel conveying pipeline with boiler furnace connects, the last rotary feeder that sets up of fuel conveying pipeline, the fuel conveying pipeline of rotary feeder lower part connects the delivery duct, the high pressure delivery fan is connected to the delivery duct. The utility model provides a pair of circulating fluidized bed boiler unit degree of depth peak shaving system through the peak shaving lower limit that can reduce circulating fluidized bed boiler by a wide margin, can make circulating fluidized bed unit peak shaving lower limit fall below 2%.

Description

Circulating fluidized bed boiler unit degree of depth peak shaving system

Technical Field

The utility model relates to a thermal power generation technical field, in particular to circulating fluidized bed boiler unit degree of depth peak shaving system.

Background

In recent years, renewable energy sources such as wind energy and solar energy are connected to a power grid in a large scale, and the wind energy and the solar energy have the characteristics of intermittency, randomness and the like, so that great influence is brought to a power system. In order to solve the problems of new energy grid connection consumption and the like and adapt to the requirement of power grid flexibility peak regulation, the peak regulation capacity of other units in the power grid needs to be excavated. As the occupancy of Circulating Fluidized Bed (CFB) boiler units in power grids is increasing, deep peak shaving capabilities of circulating fluidized bed boiler units are required to be deeply excavated.

At present, the regulation is carried out in a traditional deep peak regulation mode, the peak regulation lower limit of the circulating fluidized bed boiler unit can reach 30%, but the peak regulation lower limit of the thermal power unit cannot be further reduced. Therefore, a new deep peaking system for a circulating fluidized bed boiler unit is needed so as to further reduce the lower peaking limit of the thermal power generating unit.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a circulating fluidized bed boiler unit degree of depth peak shaving system that can further reduce circulating fluidized bed boiler unit peak shaving lower limit is provided.

For solving the technical problem, the utility model provides a circulating fluidized bed boiler unit degree of depth peak shaving system, including starting the bunker, the starting fuel that the ignition is being lowered in the starting the bunker, the starting the bunker pass through fuel conveying pipeline with boiler furnace connects, the last rotary feeder that sets up of fuel conveying pipeline, the fuel conveying pipeline of rotary feeder lower part connects the delivery duct, the high-pressure delivery fan is connected to the delivery duct.

Further, the starting fuel bin capacity is the fuel amount required by 4-6 minutes when the boiler is started.

Further, the starting fuel is lignite or biomass fuel.

Further, the conveying air pipe conveys oxygen-enriched air with the oxygen content of 28% -32%.

Further, the fuel conveying pipeline is connected with the boiler furnace through a furnace coal feeding pipe.

The utility model provides a circulating fluidized bed boiler unit degree of depth peak shaving system sets up the start-up bunker on the circulating fluidized bed boiler, and pack into combustible fuel in the start-up bunker, when the electric wire netting load demand is lower, the circulating fluidized bed boiler unit with start-up bunker can carry out the operation of suppressing a fire; when the load demand of a power grid is high and the circulating fluidized bed boiler unit needs to be started by suppressing fire, combustible fuel can be conveyed to a hearth firstly, and the circulating fluidized bed boiler unit can be started quickly without throwing oil at a lower bed temperature by burning the combustible fuel, so that the boiler unit can be recovered to normally operate. The utility model discloses a start-up bunker and increase about 1h when enabling circulating fluidized bed boiler unit to suppress fire, thereby make the fluidized bed boiler unit to suppress fire long increasing to 2.5h from average 1.5h, it is long when having prolonged the suppressing fire of thermal power generating unit, the long time requirement of scheduling basic peak regulation has been satisfied, enable the unit in longer time from the full load regulation of 1% ~ 100% rated output, the problem that fluidized bed boiler unit can not further reduce the peak regulation lower limit because the length is too short when suppressing fire has been solved. And, the utility model provides a circulating fluidized bed boiler unit degree of depth peak shaving system, simple structure, convenient operation, the operation maintenance cost is low, has wider utilization and spreading value.

Drawings

Fig. 1 is a schematic structural diagram of a depth peak-shaving system of a circulating fluidized bed boiler unit provided by an embodiment of the present invention.

Detailed Description

Referring to fig. 1, the embodiment of the present invention provides a circulating fluidized bed boiler unit deep peak shaving system, including starting bunker 1, starting bunker 1 is connected with circulating fluidized bed boiler furnace 2 through fuel conveying pipeline 3, can carry the starting fuel in starting bunker 1 to circulating fluidized bed boiler furnace 2 through fuel conveying pipeline 3. Wherein, set up furnace coal supply pipe 4 on boiler furnace 2, fuel conveying pipeline 3 is connected with furnace coal supply pipe 4, and fuel conveying pipeline 3 is connected with boiler furnace 2 through furnace coal supply pipe 4. In order to adjust the feeding amount of the starting fuel conveyed into the hearth 2 by the starting fuel bin 1, the rotary feeder 5 is arranged on the fuel conveying pipeline 3, the discharging speed of the starting fuel bin 1 into the fuel conveying pipeline 3 can be adjusted by controlling the rotating speed of the rotary feeder 5, and therefore the feeding amount of the starting fuel into the hearth 2 can be controlled.

A conveying air pipe 7 is connected to the fuel conveying pipeline 3 at the lower part of the rotary feeder 5, and a high-pressure conveying fan 6 is connected to the conveying air pipe 7. The high-pressure conveying fan 6 can send the oxygen-enriched air into the fuel conveying pipeline 3 in the form of high-pressure gas through the conveying air pipe 7, the high-pressure oxygen-enriched air entering the fuel conveying pipeline 3 conveys the starting fuel to the hearth coal feeding pipe 4 through high-pressure air, and then the starting fuel enters the upper part of the cloth sealing plate 8 in the boiler hearth 2 from the hearth coal feeding pipe 4.

Wherein, the starting fuel who puts down the ignition point in the starting bunker 1, as the utility model discloses a specific embodiment, starting fuel is brown coal or biomass fuel.

As a specific embodiment of the present invention, the volume of the start-up bunker 1 is the amount of fuel required for 4-6 minutes of boiler start-up.

As a specific implementation mode of the utility model, the oxygen-enriched air delivered by the delivery air pipe 7 is oxygen-enriched air with the oxygen content of 28-32%.

The embodiment of the utility model provides a pair of circulating fluidized bed boiler unit degree of depth peak shaving system when the electric wire netting needs to reduce the unit load to minimum surely fire below the load, presses fire through circulating fluidized bed boiler unit, reduces the unit and exert oneself.

The specific operation is to cut off the coal feeding, when the oxygen quantity of the hearth outlet is increased by 2 percent, the boiler fan is stopped completely, the output of the steam turbine generator unit is rapidly reduced to 1 to 2 percent of the rated load, but the generator is always kept not to be disconnected, and the steam turbine is not braked.

When the boiler unit needs to be quickly started by a power grid, a fan of the boiler unit is quickly started, bed materials are fluidized normally, after purging is completed, starting fuel with high heat value and low ignition point is quickly put into a dense-phase area of a boiler hearth 2 through a starting fuel bin 1, and meanwhile, proper coal feeding is put into the boiler hearth 2.

After the start fuel is put in, the bed material in the dense-phase region of the boiler hearth 2 is heated by the heat released by the quick ignition and combustion of the start fuel, and the coal is fed into the boiler and is combusted.

When the coal is fed to the boiler and the boiler is normally burnt, the load of the boiler unit is adjusted to ensure that the temperature and the pressure of the unit are normal, the boiler is recovered to be normal, and the unit is normally loaded, so that the full load adjustment of the unit from 1-100% of rated output is realized.

The embodiment of the utility model provides a pair of circulating fluidized bed boiler unit degree of depth peak shaving system, when circulating fluidized bed boiler suppression fire starts, carry low inflammable biomass fuel or brown coal etc. of firing temperature to boiler furnace 2 through starting bunker 1, make the boiler can not throw oil and start at lower bed temperature (reduce about 100 ℃ than the firing temperature of burning coal usually), thereby make when suppressing fire prolong about 2.5h to about from usual 1.5h, make when the peak shaving long requirement when satisfying the scheduling peak shaving, thereby make circulating fluidized bed boiler unit can realize the peak shaving through the mode of suppressing fire.

The embodiment of the utility model provides a pair of circulating fluidized bed boiler unit degree of depth peak shaving system drops into inflammable fuel through starting the bunker when the boiler is built a fire after the start-up, reduces and starts the bed temperature, and about 1h when the extension is built a fire, satisfy the long requirement of dispatch to the peak shaving, the unit can be adjusted from the full load of 1% ~ 100% rated output in longer time. And the peak regulation system has the advantages of simple structure, convenient operation, lower operation and maintenance cost and higher economic benefit, and is worthy of application and popularization.

The utility model provides a pair of circulating fluidized bed boiler unit degree of depth peak shaving system through the peak shaving lower limit that can reduce circulating fluidized bed boiler by a wide margin, can make circulating fluidized bed unit peak shaving lower limit fall below 2%.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. The deep peak shaving system of the circulating fluidized bed boiler unit is characterized by comprising a starting bunker, starting fuel with a low ignition point is stored in the starting bunker, the starting bunker is connected with a boiler hearth through a fuel conveying pipeline, a rotary feeder is arranged on the fuel conveying pipeline, the fuel conveying pipeline on the lower portion of the rotary feeder is connected with a conveying air pipe, and the conveying air pipe is connected with a high-pressure conveying fan.

2. The circulating fluidized bed boiler unit depth peaking system of claim 1, wherein: the starting fuel bin capacity is the fuel amount required by 4-6 minutes when the boiler is started.

3. The circulating fluidized bed boiler unit deep peak shaving system according to claim 1, characterized in that: the starting fuel is lignite or biomass fuel.

4. The circulating fluidized bed boiler unit deep peak shaving system according to claim 1, characterized in that: the fuel conveying pipeline is connected with the boiler furnace through a furnace coal feeding pipe.