A w flame boiler rapid peak shaving system and operation method

Abstract

A kind of W flame boiler quick peak shaving system and operating method, including furnace and several coal mills, the outlet end of each described coal mill is at least four burners corresponding connection, all described burners are connected with described furnace;At least one described coal mill is connected with peak shaving system, and the peak shaving system includes coal powder storage device and coal powder supply device;The output end of described coal powder storage device is connected with the input end of described coal powder supply device, and the output end of described coal powder supply device is at least connected with two different described coal mill outlet end corresponding connection part described burner, to make part described coal mill work, at least one in the middle section of described furnace adjacent two burners is in operating state, with reduce system improvement cost, increase system peak shaving response rate and guarantee system stable combustion advantage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wide load peak shaving of power station boilers, in particular to a W flame boiler rapid peak shaving system and a running method thereof. BACKGROUND

[0002] Under the background of double carbon, the proportion of new energy power sources lacking regulation capacity is gradually increasing, and flexible power resources are in short supply. At present, coal-fired power is the only flexible resource with large-scale economic deep peak shaving capacity. Therefore, it is a major demand of the country to greatly improve the flexibility of coal-fired power generation.

[0003] The W flame boiler in the existing W flame boiler rapid peak shaving system adopts a direct-fired system, and the qualified coal powder entering the furnace is intelligently sourced from a coal mill. When the load needs to be increased, the coal mill usually needs to be warmed up and then grind qualified coal powder. The entire process takes 5-10 minutes to respond, affecting the load increase rate. When the unit load is reduced, the coal supply needs to be reduced or stopped, and the coal mill needs to be shut down. It takes a certain amount of time to extract the stored powder in the coal mill, affecting the load reduction rate. In addition, in addition to poor load responsiveness, the anthracite coal used by the W flame boiler is a difficult-to-burn coal type. When the load is lower than 50% ECR load, three coal mills should be operated to ensure economic operation. Due to the special burner arrangement of the W flame boiler, it cannot be evenly shut down. For example, if one side is shut down one mill and the other side is shut down two mills, the maximum distance of the operating burners will reach 4-5 meters, resulting in uneven thermal load on the water wall tube on the furnace cross section, uneven expansion of the water wall, and easy cracking of the water wall fins. Therefore, in actual operation, four mills are forced to operate at low load, resulting in high primary air rate, low secondary air rate, poor combustion organization in the furnace, and poor boiler combustion efficiency. However, the existing W flame boiler has been widely used, and the demolition and reconstruction will increase the manufacturing cost of the entire system.

[0004] Therefore, it is worth studying the optimization of the existing W flame boiler. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the defects in the prior art, thereby providing a W flame boiler rapid peak shaving system and a running method thereof.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The application discloses a W flame boiler rapid peak regulation system, which comprises a furnace and a plurality of coal mills, and the outlet end of each coal mill is connected with at least four burners, and all the burners are connected with the furnace; at least one coal mill is connected with a peak regulation system, the peak regulation system comprises a pulverized coal storage device and a pulverized coal supply device; the input end of the pulverized coal storage device is connected with the output end of the coal mill, and a first control member is arranged between the input end of the pulverized coal storage device and the output end of the coal mill, so as to control the pulverized coal conveying flow; the output end of the pulverized coal storage device is connected with the input end of the pulverized coal supply device, and the output end of the pulverized coal supply device is connected with at least two burners corresponding to the outlet end of the coal mill, so that at least one of the two adjacent burners in the middle section of the furnace is in the running state when part of the coal mills work.

[0008] Preferably, the peak regulation system further comprises a hot air main pipe and a plurality of air supply pipes; the hot air main pipe is connected with the pulverized coal supply device through the air supply pipe, and a second control member is arranged on the air supply pipe, so as to control the hot air conveying flow.

[0009] Preferably, the pulverized coal storage device comprises a pulverized coal separator, a pulverized coal bin and a waste steam treatment assembly, wherein the input end of the waste steam treatment assembly is connected with the pulverized coal separator; the output end of the waste steam treatment assembly is connected with the output end of the air supply pipe, and / or the output end of the waste steam treatment assembly is connected with the burner or the furnace.

[0010] Preferably, the input end of the pulverized coal separator is connected with the output end of the coal mill connected therewith, and the output end of the pulverized coal separator is connected with the pulverized coal bin; an air lock is arranged between the pulverized coal separator and the pulverized coal bin, so as to limit the backflow of the pulverized coal transferred from the pulverized coal separator to the pulverized coal bin.

[0011] Preferably, the waste steam treatment assembly comprises a pulverized coal exhaust fan connected with the pulverized coal separator, the outlet end of the pulverized coal exhaust fan is connected with a first pipeline and a second pipeline; one end of the first pipeline is connected with the output end of the air supply pipe, and a third control member is arranged on the first pipeline, so as to control the waste steam conveying flow; one end of the second pipeline is connected with a wind box, and a fourth control member is arranged on the second pipeline, so as to control the waste steam conveying flow.

[0012] Preferably, the pulverized coal supply device comprises a plurality of powder feeders connected with the output end of the pulverized coal storage device; each powder feeder is connected with a wind-pulverized coal mixer, and the output end of each wind-pulverized coal mixer is connected with a burner; the connecting pipeline between the powder feeder and the wind-pulverized coal mixer is connected with the output end of the air supply pipe; a fifth control member is further arranged between the wind-pulverized coal mixer and the burner connected therewith, so as to control the pulverized coal conveying flow.

[0013] The operation method of the W flame boiler rapid peak regulation system comprises a low load peak regulation step,

[0014] The low load peak regulation step comprises adjusting the pulverized coal supply by using the peak regulation system connected with the at least one coal mill, and specifically comprises storing the pulverized coal generated by the coal mill by using the pulverized coal storage device of the peak regulation system; and supplying the pulverized coal stored in the pulverized coal storage device to the corresponding part of the burners connected with the outlet end of the at least two different coal mills by using the pulverized coal supply device, so that at least one of the two adjacent burners in the middle section of the furnace is in an operating state when part of the coal mills are working.

[0015] Preferably, the pulverized coal stored in the pulverized coal storage device is supplied to the corresponding part of the burners connected with the outlet end of the at least two different coal mills by using the pulverized coal supply device, and specifically comprises: introducing the pulverized coal output by the coal feeder of the pulverized coal supply device into the wind-pulverized coal mixer together with the hot air supplied by the hot air mother pipe and the air supply pipe; and introducing the hot air and the pulverized coal mixed in the wind-pulverized coal mixer into the corresponding burners.

[0016] Preferably, the wind-pulverized coal mixture generated by the coal mill is stored by using the pulverized coal storage device of the peak regulation system, and specifically comprises: separating the pulverized coal and the exhaust steam generated by the coal mill by using the pulverized coal separator of the pulverized coal storage device; storing the separated pulverized coal by using the pulverized coal bin of the pulverized coal storage device; and transporting and processing the exhaust steam by using the exhaust steam processing assembly of the pulverized coal storage device.

[0017] Preferably, the exhaust steam is transported and processed by using the exhaust steam processing assembly of the pulverized coal storage device, and specifically comprises: discharging the exhaust steam from the pulverized coal separator by using the exhaust steam processing assembly; mixing the exhaust steam with the hot air output by the air supply pipe by using the first pipeline of the exhaust steam processing assembly, and then sending the mixture into the burners or the furnace, and / or sending the exhaust steam to the air box by using the second pipeline of the exhaust steam processing assembly, and then further sending the exhaust steam to the burners or the furnace.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] The technical scheme provided in the above embodiment is a W flame boiler fast peak regulation system, at least one coal mill is connected with the peak regulation system, when one of the coal mills is started, part of the burners of the two coal mills can be simultaneously ignited, according to the distribution characteristics of the W boiler combustion system, the peak regulation system can be set to only need to use three coal mills to ensure that the furnace is evenly heated and the system is stably operated, compared with the traditional W flame boiler which needs to use four coal mills to ensure that the furnace is evenly heated and the system is stably operated under low load, the embodiment can reduce the use of coal mills, thereby avoiding system loss, and the peak regulation system can be directly connected with the coal mill, compared with the reconstruction of the W flame boiler which has been put into use, the manufacturing cost can be greatly saved; in addition, through the cooperation of the pulverized coal storage device and the pulverized coal supply device, when the load is reduced, the pulverized coal storage device can quickly store the excess coal for quickly supplying the pulverized coal when the load is increased; when the load needs to be increased, the pulverized coal stored in the pulverized coal storage device can be quickly supplied to the burners through the pulverized coal supply device, avoiding the need to warm up the coal mill which affects the load increasing rate, thereby making the peak regulation system have better peak regulation effect and the whole system run more stably. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the specific embodiments or prior art of the present application, the drawings needed in the following specific embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0021] Figure 1 It is a schematic diagram of the connection between the coal mill and the peak regulation system of the present system.

[0022] Figure 2 It is a schematic diagram of the distribution of the burner and the furnace of the present system.

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] 1, furnace; 101, first control member; 102, second control member; 103, third control member; 104, fourth control member; 105, fifth control member; 106, sixth control member; 2, coal mill; 20, burner; 3, peak regulation system; 30, pulverized coal storage device; 301, pulverized coal separator; 302, pulverized coal bin; 303, exhaust steam treatment assembly; 3030, exhaust air fan; 3031, first pipeline; 3032, second pipeline; 3033, air bellow; 304, air lock; 31, pulverized coal supply device; 311, coal feeder; 312, air-pulverized coal mixer; 32, hot air main pipe; 33, air supply pipe. DETAILED DESCRIPTION

[0025] The technical solutions of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] As shown in Figure 1 , Figure 2 The present application provides a kind of W flame boiler fast peak shaving system, including hearth 1 and several coal mills 2, the outlet end of each coal mill 2 is connected with at least four burners 20, all burners 20 are connected with hearth 1, specifically, the outlet end of coal mill 2 and its corresponding connected burner 20 are equipped with sixth control member 106, to control the flow of coal powder. Taking 300MW level W boiler system as an example, coal mill 2 usually includes six, each coal mill 2 usually includes four burners 20;For the convenience of description, six coal mills 2 can be defined as A mill, B mill, C mill, D mill, E mill, F mill, A mill is connected with A1, A2, A3, A4, B mill is connected with B1, B2, B3, B4, C mill is connected with C1, C2, C3, C4, D mill is connected with D1, D2, D3, D4, E mill is connected with E1, E2, E3, E4, F mill is connected with F1, F2, F3, F4, wherein, each burner 20 is distributed on both sides of hearth 1, as shown in Figure 2 .

[0029] In the embodiment, at least one coal mill 2 is connected with the peak regulation system 3, and the peak regulation system 3 comprises a coal powder storage device 30 and a coal powder supply device 31. The coal powder storage device 30 and the coal powder supply device 31 are used in cooperation. When the load is reduced, the coal powder storage device 30 can quickly store the excess coal. When the load needs to be increased, the coal powder stored in the coal powder storage device 30 can be quickly supplied to the burner 20 through the coal powder supply device 31, and then supplied to the furnace 1 through the burner 20 nozzle, so as to avoid the need for warm grinding of the coal mill 2, thereby affecting the load increase rate, and further to make the peak regulation effect of the peak regulation system 3 better. For example, in the existing system, during the process of increasing the load, the coal mill 2 needs to go through the process of warm grinding. At this time, it cannot provide coal powder and needs to supply coal powder after the warm grinding is completed, thereby affecting the load increase rate. In the embodiment, during the process of warm grinding of the coal mill 2, the coal powder stored in the coal powder storage device 30 can be quickly supplied to the burner 20 through the coal powder supply device 31, and then supplied to the furnace 1 through the burner 20 nozzle, thereby improving the load increase rate. When the load is reduced, the coal mill 2 can be cut off to supply coal powder to the burner 20, and the coal powder storage device 30 can be used for storage, thereby avoiding the retention of excess coal powder in the coal mill 2. Of course, in other embodiments, the peak regulation system 3 can also be connected with one or more of the B mill, the C mill, and the like.

[0030] Further, in order to realize that at least one of the two adjacent burners 20 in the middle section of the furnace 1 is in a running state, so as to make the furnace 1 evenly heated, and at the same time, the input of the coal mill 2 is reduced as much as possible to save the system energy consumption. In the embodiment, the output end of the coal powder supply device 31 is connected with at least two different mill outlets corresponding to the connected part of the burner 20, so that at least one of the two adjacent burners 20 in the middle section of the furnace 1 is in a running state when part of the coal mill 2 works. Specifically, as shown in Figure 1 、 Figure 2 In the embodiment, the A mill is connected with the corresponding peak regulation system 3, and the output end of the peak regulation system 3 connected with the A mill is connected with part of the burners 20 of the A mill and the D mill, specifically A1, A4, D1, and D4, as shown in Figure 1 So that under low load, only three coal mills need to be started to realize that at least one of the two adjacent burners 20 in the middle section of the furnace 1 is in a running state. If the A mill is not connected with the peak regulation system 3, at least four coal mills 2 need to be started to keep the furnace 1 evenly heated. Compared with the latter, in the embodiment, the input of the coal mill 2 can be reduced under the condition of ensuring that the furnace 1 is evenly heated and the system is stably operated, thereby avoiding system loss.

[0031] Further, in the embodiment, the input end of the pulverized coal storage device 30 is connected with the output end of the coal mill 2, and the first control member 101 is arranged between the input end of the pulverized coal storage device 30 and the output end of the coal mill 2 to control the pulverized coal conveying flow; the output end of the pulverized coal storage device 30 is connected with the input end of the pulverized coal supply device 31, and the first control member 101 and the sixth control member 106 can be arranged as a baffle or a valve, and the opening degree thereof can be set to 0-100%, thereby controlling the pulverized coal flow conveyed from the output end of the coal mill 2 to the pulverized coal storage device 30, and the cooperation of the first control member 101 and the sixth control member 106 is beneficial to control the coal of the coal mill 2 in the system to be supplied to the peak regulation system 3 and the corresponding burner 20 connected therewith, thereby making the system more flexible.

[0032] Since the anthracite coal used by the W flame boiler is usually a difficult-to-burn coal, in order to make the pulverized coal combustion effect better, in the embodiment, the peak regulation system 3 comprises a hot air main pipe 32 and a plurality of air supply pipes 33; the hot air main pipe 32 is connected with the pulverized coal supply device 31 through the air supply pipe 33, and the second control member 102 is arranged on the air supply pipe 33 to control the hot air conveying flow. The connection of the hot air main pipe 32 with the pulverized coal supply device 31 makes the pulverized coal supplied by the pulverized coal supply device 31 be able to be mixed with the hot air supplied by the hot air main pipe 32 first, and then be supplied to the corresponding burner 20, and further be supplied to the furnace 1 through the nozzle of the burner 20, which is beneficial to the combustion of the pulverized coal in the furnace 1, and makes the system combustion more stable.

[0033] Since the pulverized coal ground by the coal mill 2 is usually a gas-pulverized coal mixture, which will affect the storage of the pulverized coal, therefore, in the embodiment, the pulverized coal storage device 30 comprises a pulverized coal separator 301, a pulverized coal bin 302 and a steam exhaust treatment assembly 303, wherein the input end of the steam exhaust treatment assembly 303 is connected with the pulverized coal separator 301; so that the pulverized coal and the steam exhaust can be separated, which is beneficial to the storage of the pulverized coal on one hand, and beneficial to the reuse of the steam exhaust on the other hand.

[0034] Further, in the embodiment, the output end of the steam exhaust treatment assembly 303 is connected with the output end of the air supply pipe 33, which can be mixed with the hot air of the air supply pipe 33 and then be supplied to the burner 20 or the furnace 1, which is beneficial to the combustion; at the same time, the output end of the steam exhaust treatment assembly 303 is also connected with the burner 20 or the furnace 1. Specifically, the steam exhaust treatment assembly 303 comprises a pulverized coal exhaust fan 3030 connected with the pulverized coal separator 301, and the outlet end of the pulverized coal exhaust fan 3030 is connected with a first pipeline 3031 and a second pipeline 3032; one end of the first pipeline 3031 is connected with the output end of the air supply pipe 33, and the third control member 103 is arranged on the first pipeline 3031 to control the steam exhaust conveying flow; one end of the second pipeline 3032 is connected with a bellows 3033, and the fourth control member 104 is arranged on the first pipeline 3031 to control the steam exhaust conveying flow.

[0035] Of course, in other embodiments, the output end of the exhaust steam treatment component 303 may be connected only to the output end of the air supply pipe 33, or only to the burner 20 or the furnace 1.

[0036] In this embodiment, the input end of the pulverized coal separator 301 is connected to the output end of the corresponding coal mill 2. In order to limit the backflow of pulverized coal transferred from the pulverized coal separator 301 to the pulverized coal bin 302, the output end of the pulverized coal separator 301 is connected to the pulverized coal bin 302. An airlock 304 is provided between the pulverized coal separator 301 and the pulverized coal bin 302.

[0037] like Figure 1 , Figure 2 As shown, in this embodiment, the pulverized coal supply device 31 includes four pulverized coal storage devices 30 whose output ends are connected to a pulverizer 311, and each is connected to its corresponding air-pulverized coal mixer 312, thereby supplying pulverized coal to its corresponding burner 20. The connecting pipe between the pulverizer 311 and the air-pulverized coal mixer 312 is connected to the output end of the air supply pipe 33, so that the pulverized coal is mixed with hot air before being supplied to the burner 20. This is beneficial for pulverized coal transportation and the preheated pulverized coal is more conducive to combustion. A fifth control component 105 is also provided between the air-pulverized coal mixer 312 and its corresponding burner 20 to control the pulverized coal transportation flow rate. Similarly, the fifth control component 105 can also be a baffle, valve, etc., and its opening degree can be set from 0 to 100%.

[0038] This invention provides an operation method for a rapid peak-shaving system for a W-flame boiler, specifically including a low-load peak-shaving step. This low-load peak-shaving step includes adjusting the pulverized coal supply using a peak-shaving system 3 connected to at least one coal mill 2. Specifically, this includes storing the pulverized coal generated by the coal mill 2 using a pulverized coal storage device 30 of the peak-shaving system 3; and supplying the pulverized coal stored in the pulverized coal storage device 30 to at least two different burners 20 connected to the outlet ends of the coal mills 2 using a pulverized coal supply device 31, so that when some coal mills 2 are operating, at least one of two adjacent burners 20 in the middle section of the furnace 1 is in operation.

[0039] Furthermore, the coal powder stored in the coal powder storage device 30 is supplied by the coal powder supply device 31 to the burners 20 connected to the outlet ends of at least two different coal mills 2. Specifically, this includes: introducing the coal powder output from the coal feeder 311 of the coal powder supply device 31 and the hot air supplied by the hot air header 32 and the air supply pipe 33 into the air-coal mixer 312; and introducing the hot air and coal powder mixed in the air-coal mixer 312 into the burners 20 connected to it.

[0040] Further, the pulverized coal storage device 30 of the peak regulation system 3 is used to store the wind-pulverized coal mixture generated by the coal mill 2, which specifically includes: the pulverized coal separator 301 of the pulverized coal storage device 30 is used to separate the pulverized coal and the exhaust steam generated by the coal mill 2; the pulverized coal bin 302 of the pulverized coal storage device 30 is used to store the separated pulverized coal; and the exhaust steam treatment assembly 303 of the pulverized coal storage device 30 is used to transport and treat the exhaust steam.

[0041] Further, the exhaust steam treatment assembly 303 of the pulverized coal storage device 30 is used to transport and treat the exhaust steam, which specifically includes: the exhaust steam of the pulverized coal separator 301 is discharged by the exhaust steam fan 3030 of the exhaust steam treatment assembly 303; the exhaust steam mixed with the hot air output by the air supply pipe 33 is sent into the burner 20 or the furnace 1 by the first pipeline 3031 of the exhaust steam treatment assembly 303; of course, the exhaust steam can also be transported to the bellows 3033 by the second pipeline 3032 of the exhaust steam treatment assembly 303 and then further transported to the burner 20 or the furnace 1; in addition, in other embodiments, the exhaust steam can also be treated and reused by using any of the above-mentioned ways.

[0042] Of course, in other embodiments, in addition to the 300MW W boiler system burner 20 arrangement, for other burner 20 arrangements, the problem of uniform operation of the burner 20 can also be solved by adding the pulverized coal bin 302 or the powder feeder 311, and the present embodiment is described by introducing the 300MW W boiler system burner 20 arrangement for convenience.

[0043] When the system is running, it can include the following working conditions:

[0044] Working condition one: normal operation of the coal mill 2 to grind and supply pulverized coal to the burner 20 and further to the furnace 1 for combustion.

[0045] In this working condition, the first control member 101 and the fifth control member 105 are closed, the sixth control member 106 is opened, and the peak regulation system 3 is not running as a whole, the pulverized coal ground by the coal mill 2 is directly supplied to the corresponding burner 20, and then enters the furnace 1 through the nozzle of the burner 20 for combustion.

[0046] Working condition two: storing pulverized coal.

[0047] In this working condition, the second control member 102, the third control member 103, the fifth control member 105 and the sixth control member 106 are closed; the first control member 101 and the fourth control member 104 are opened, the coal mill 2 is operated, the wind-powder mixture after the raw coal is ground by the coal mill 2 is sent to the coal powder separator 301 through the powder conveying pipeline, the coal powder after the separation enters the coal powder bin 302 through the air lock 304 for storage to be put into use in the peak regulation period. The powder exhaust fan 3030 is operated, the exhaust steam after the separation of the coal powder separator 301 enters the air box 3033 through the powder exhaust fan 3030, and then enters the burner 20 and then enters the furnace 1 or directly enters the furnace 1 to assist combustion.

[0048] Working condition three: the coal powder in the coal powder bin 302 is supplied.

[0049] In this working condition, the first control member 101, the third control member 103, the sixth control member 106 and the fourth control member 104 are closed, the second control member 102 and the fifth control member 105 are opened, the powder feeder 311 and the wind-powder mixer 312 are started, the powder exhaust fan 3030 and the coal mill 2 are stopped, the coal powder in the coal powder bin 302 is conveyed to the wind-powder mixer 312 by the powder feeder 311, the hot air conveyed by the hot air main pipe 32 and the air supply pipe 33 is conveyed to the wind-powder mixer 312, the mixed coal powder and hot air are conveyed to the corresponding burner 20, and then are supplied to the furnace 1 through the burner 20 nozzle for combustion. At this time, the A mill, the B mill and the F mill can be started simultaneously, so that the furnace 1 can be uniformly heated.

[0050] Working condition four: the coal mill 2 is operated to grind coal powder and the coal powder bin 302 is operated to supply coal powder.

[0051] The fourth control member 104 and the sixth control member 106 are closed, the first control member 101, the second control member 102, the third control member 103 and the fifth control member 105 are opened, and the powder exhaust fan 3030 and the powder feeder 311 are started. The raw coal is ground by the coal mill 2 and then enters the coal powder separator 301, the separated coal powder enters the coal powder bin 302 through the air lock 304, the coal powder in the coal powder bin 302 enters the wind-powder mixer 312 through the powder feeder 311, the hot air is introduced through the hot air main pipe 32 and the air supply pipe 33, the exhaust steam separated by the coal powder separator 301 is introduced into the output end of the air supply pipe 33 through the powder exhaust fan 3030, mixed with the hot air, and then enters the wind-powder mixer 312, and then is sent to the burner 20 through the powder pipe, and then is further sent to the furnace 1 through the burner 20 nozzle for combustion.

[0052] The above-mentioned embodiments are only preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by those skilled in the art on the basis of the present application shall fall within the protection scope of the present application.

Claims

1. A rapid peak-shaving system for a W-flame boiler, comprising a furnace and several coal mills, wherein at least four burners are connected to the outlet end of each coal mill, and all the burners are connected to the furnace; Its features are, At least two of the coal mills are connected to a peak-shaving system, which includes a pulverized coal storage device and a pulverized coal supply device. The input end of the pulverized coal storage device is connected to the output end of the coal mill, and a first control element is provided between the input end of the pulverized coal storage device and the output end of the coal mill to control the pulverized coal conveying flow rate; The output end of the pulverized coal storage device is connected to the input end of the pulverized coal supply device. The output end of the pulverized coal supply device is connected to at least two different burners corresponding to the outlet ends of the coal mills, so that when some of the coal mills are working, at least one of the two adjacent burners in the middle section of the furnace is in operation. The four burners connected to the same coal mill are located on opposite sides of the furnace, and the burners on both sides are staggered.

2. The rapid peak-shaving system for a W-flame boiler according to claim 1, characterized in that, The peak-shaving system also includes a hot air main pipe and several air supply pipes; The hot air main pipe is connected to the pulverized coal supply device through an air supply pipe, and a second control component is provided on the air supply pipe to control the hot air delivery flow rate.

3. The rapid peak-shaving system for a W-flame boiler according to claim 2, characterized in that, The pulverized coal storage device includes a pulverized coal separator, a pulverized coal silo, and a waste steam treatment component, wherein the input end of the waste steam treatment component is connected to the pulverized coal separator. The output end of the exhaust steam treatment component is connected to the output end of the air supply pipe, and / or the output end of the exhaust steam treatment component is connected to the burner or the furnace.

4. A rapid peak-shaving system for a W-flame boiler according to claim 3, characterized in that, The input end of the pulverized coal separator is connected to the output end of the corresponding coal mill, and the output end of the pulverized coal separator is connected to the pulverized coal silo. An airlock is provided between the pulverized coal separator and the pulverized coal bin to restrict the backflow of pulverized coal that has transferred from the pulverized coal separator to the pulverized coal bin.

5. A rapid peak-shaving system for a W-flame boiler according to claim 3, characterized in that, The exhaust steam treatment assembly includes a pulverized coal separator connected to a pulverized coal separator, and the outlet end of the pulverized coal separator is connected to a first pipeline and a second pipeline. One end of the first pipeline is connected to the output end of the air supply pipe, and a third control element is provided on the first pipeline to control the exhaust steam delivery flow rate; One end of the second pipeline is connected to a bellows box, and a fourth control element is installed on the second pipeline to control the flow rate of exhaust steam.

6. A rapid peak-shaving system for a W-flame boiler according to claim 2, characterized in that, The pulverized coal supply device includes several feeders connected to the output end of the pulverized coal storage device. Each of the powder feeders is connected to a corresponding air-powder mixer, and the output end of each air-powder mixer is connected to a burner; The connecting pipe between the powder feeder and the air-powder mixer is connected to the output end of the air supply pipe; A fifth control element is also provided between the air-coal mixer and its corresponding burner to control the coal powder conveying flow rate.

7. An operation method for a W-flame boiler rapid peak-shaving system as described in any one of claims 1 to 6, characterized in that: Including low-load peak shaving steps, The low-load peak shaving step includes: adjusting the coal powder supply using a peak shaving system connected to at least one coal mill, specifically including: storing the coal powder generated by the coal mill using a coal powder storage device of the peak shaving system; and supplying the coal powder stored in the coal powder storage device to a portion of the burners corresponding to the outlet ends of at least two different coal mills using a coal powder supply device, so that when a portion of the coal mills is working, at least one of two adjacent burners in the middle section of the furnace is in operation.

8. The operating method according to claim 7, characterized in that, The coal powder stored in the coal powder storage device is supplied to the burners connected to the outlet ends of at least two different coal mills using a coal powder supply device, specifically including: The pulverized coal output from the pulverized coal feeder of the pulverized coal supply device is introduced into the air-pulverized coal mixer along with the hot air supplied by the hot air header and the air delivery pipe. The hot air and pulverized coal mixed by the air-coal mixer are introduced into the burner connected to it.

9. The operating method according to claim 8, characterized in that, The coal powder storage device of the peak-shaving system stores the air-coal mixture generated by the coal mill, specifically including: The coal powder and exhaust steam generated by the coal mill are separated using the coal powder separator of the coal powder storage device; The separated coal powder is stored in the coal powder hopper of the coal powder storage device. The waste steam is transported and processed using the waste steam treatment component of the pulverized coal storage device.

10. The operating method according to claim 9, characterized in that, The waste steam is transported and processed using the waste steam treatment component of the pulverized coal storage device, specifically including: The exhaust steam from the pulverized coal separator is removed using the exhaust steam treatment component's exhaust fan; The exhaust steam is mixed with the hot air output from the air supply pipe and then sent into the burner or furnace through the first pipe of the exhaust steam treatment assembly, and / or the exhaust steam is transported to the air box and further to the burner or furnace through the second pipe of the exhaust steam treatment assembly.

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