WO2018120256A1 - 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法 - Google Patents

按煤粉重量均衡供粉和按重量配风控制装置及其控制方法 Download PDF

Info

Publication number
WO2018120256A1
WO2018120256A1 PCT/CN2017/000410 CN2017000410W WO2018120256A1 WO 2018120256 A1 WO2018120256 A1 WO 2018120256A1 CN 2017000410 W CN2017000410 W CN 2017000410W WO 2018120256 A1 WO2018120256 A1 WO 2018120256A1
Authority
WO
WIPO (PCT)
Prior art keywords
weight
air
control
powder
pulverized coal
Prior art date
Application number
PCT/CN2017/000410
Other languages
English (en)
French (fr)
Inventor
邸生才
Original Assignee
邸生才
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from CN201611225253.4A external-priority patent/CN106989412B/zh
Priority claimed from CN201621449630.8U external-priority patent/CN208635143U/zh
Application filed by 邸生才 filed Critical 邸生才
Publication of WO2018120256A1 publication Critical patent/WO2018120256A1/zh

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23KFEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N1/00Regulating fuel supply
    • F23N1/02Regulating fuel supply conjointly with air supply
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P5/00Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft

Definitions

  • the coal-fired boiler is balanced by the weight of the powder and the air by the weight.
  • Coal-fired boilers such as coal-fired power station boilers, large-scale heating boilers, industrial boilers, and cement kiln boilers, use air-feeding pipes to supply powder to boilers.
  • the milling and powder supply systems of large-scale power station boilers use multi-layer powder. Each layer uses a coal grinding mechanism powder with multiple air supply pipes for powder supply.
  • Large boilers usually have three layers – six layers for powder supply, one coal mill per floor, four pipes, for a total of 12-24 pipes, and the equipment used in each layer is the same. The following is a description of the powdering and powder supply equipment (as shown in Figure 1):
  • V 0 The minimum amount of air (indicated by V 0 ) required for complete combustion of 1 Kg (or 1 m 3 ) of fuel (no residual oxygen after combustion) is called the theoretical amount of air.
  • V k The amount (in V k ) is always slightly larger than the theoretical air amount V 0 , which Called the excess air coefficient, ie:
  • the fuel weight W (kg) is completely burned and the required air volume is:
  • the existing milling and powder supply system uses two circuit pairs. The ratio is adjusted. The first is the fuel quantity adjustment circuit. The fuel quantity is used to track the heat load adjustment required for power generation. The second is to adjust the air distribution according to the oxygen content in the flue gas to maintain the excess air coefficient ⁇ within a certain range.
  • the excess air coefficient ⁇ can be calculated from equation (3).
  • Adjusting the air distribution according to the oxygen content of the flue gas is a late adjustment.
  • the oxygen content of the flue gas only reflects the combustion condition of the pulverized coal (insufficient combustion, excessive combustion, complete combustion). This kind of late adjustment can not adjust the air distribution according to the weight of pulverized coal.
  • the ratio reaches the complete combustion condition of pulverized coal in real time;
  • the present invention discloses a "balanced powder supply according to the weight of coal powder and a wind distribution control device and a control method thereof", which can realize balanced powder supply by weight and air distribution control by weight.
  • the control device of the invention is composed of two control loops, one is the pulverized coal weight and the secondary air volume equalization control loop, and the second is the air distribution control loop according to the pulverized coal weight.
  • the control technology of automatic tracking variable parameter (variable setting control value) is adopted to make the weight of each branch pulverized coal and the air volume of each branch
  • the ratio is consistent with the given excess air ratio ⁇ , which satisfies the complete combustion condition of the pulverized coal powder, so that it can be fully and efficiently burned.
  • the invention discloses a “balanced powder supply and weight distribution air control device according to weight”, which is installed in an existing coal-fired boiler powder-making and powder supply system, and the technical features thereof include:
  • the primary air blower (4) (which is the existing milling and powder supply system equipment) is installed in front of the coal mill (2) to generate a primary air, and the ground coal powder is brought into the primary air supply pipe and sent To the burners (7A), (7B), (7C), (7D);
  • a primary air velocity measuring device (11) is installed on the primary air supply pipe header (6) or each of the branch pipes (6A), (6B), (6C), (6D) for measuring the primary air delivery pipe wind speed ⁇ 1 or Branch pipe wind speed ⁇ 1A , ⁇ 1B , ⁇ 1C , ⁇ 1D ;
  • the secondary air blower (10) (which is the existing milling and powder supply system equipment) is installed at the beginning of the secondary air supply duct for generating secondary air and sent to the burners (7A), (7B), (7C), (7D);
  • the secondary air velocity measuring device (14) is installed on the secondary air supply duct main pipe (9) or each branch pipe (9A), (9B), (9C), (9D) for measuring the secondary air.
  • Air delivery duct (9) wind speed ⁇ 2 or ⁇ 2A , ⁇ 2B , ⁇ 2C , ⁇ 2D ;
  • the data acquisition controller (13) performs balanced powder supply control and weight distribution control according to the received signal and a given excess air coefficient ⁇ .
  • the “balanced powder supply according to the weight of coal powder and the air distribution control device according to the weight” is characterized in that the data acquisition controller (13) adopts the equalization control technology to adjust and control W A , W B , W C and W D to make W A , W B , W C , and W D are consistent.
  • the “balanced powder supply according to the weight of coal powder and the air distribution control device according to the weight” is characterized in that the data acquisition controller (13) calculates the required secondary distribution according to the total weight W of the coal powder and the given excess air coefficient ⁇ . Air volume with And according to Adjust and control the speed of the secondary air blower to increase or decrease V 2 to make V 2 Consistent.
  • “Equilibrium powder supply according to pulverized coal weight and air distribution control device” characterized in that it further comprises an air speed adjusting device (15), a secondary air supply main pipe (9) and a branch pipe (9A), ( Between 9B) and (9C) and (9D), it is used to adjust the wind speeds ⁇ 2A , ⁇ 2B , ⁇ 2C , ⁇ 2D in the pipelines entering the secondary winds, that is, to adjust the corresponding air volume V 2A , V 2B , V 3C , V 4D .
  • the “balanced powder supply according to the weight of coal powder and the air distribution control device according to the weight” is characterized in that the data acquisition controller (13) adopts the equalization control technology to issue a control signal to the wind speed adjusting device (15) to adjust ⁇ 2A , ⁇ 2B , ⁇ 2C , and ⁇ 2D make V 2A , V 2B , V 3C , and V 4D coincide.
  • the methods for measuring the weight of the pulverized coal are mainly: ionizing radiation method, heat balance method, energy method, photo-electricity detecting method, capacitance method, microwave method, capacitance tomography method, laser method, electrostatic induction method, etc., and the control device of the present invention
  • the stroke pulverized coal weight measuring device may be selected from any of the above methods for the pulverized coal weight measuring device.
  • wind-powder pulverized coal weight measuring device (12) is an ionizing radiation type pulverized coal powder weight measuring device or a heat balance method wind feeding powder weight Measuring device, or energy method to send pulverized coal measuring device, or light-electric detection method to send pulverized coal weight measuring device, or capacitive method to send pulverized coal measuring device, or electrical capacitance tomography
  • “Balanced powder supply according to pulverized coal weight and air distribution control device” characterized in that the primary wind speed measuring device and the secondary wind speed measuring device are differential pressure type wind speed measuring devices or backrest tube type wind speed measuring devices or flute shapes Tubular wind speed measuring device, or wing type wind speed measuring device, or double venturi tube wind speed measuring device.
  • a control method for "balanced powder supply according to pulverized coal weight and air distribution control device” is characterized in that it comprises the following steps:
  • Step 1 data acquisition, data acquisition controller collects the following signals:
  • Step 2 equalizing the powder supply, and the data acquisition controller (13) adopts the equalization control technology to adjust and control the coal powder distributor (5) so that W A , W B , W C and W D are consistent;
  • Step 3 determine if the air distribution control is still needed.
  • Step 4.1 According to the total weight of coal powder for air distribution control
  • the data acquisition controller (13) calculates the required air distribution amount according to the total weight W and the given alpha value Difference And press Adjust and control the secondary fan to make V 2 and Consistent
  • Step 4.2 According to the balanced powder supply weight control
  • Step 4.3 Control the air distribution according to the weight of the balanced coal powder and the equilibrium secondary air volume
  • FIG 1 Schematic diagram of the main equipment of the powder and powder supply system
  • FIG. 1 (a) schematic view of the invention in which the control device is mounted on the main conduit of Figure 1.
  • Figure 2 (b) Schematic diagram of the air supply duct of each branch installed in the control device of Figure 1.
  • Figure 3 is a schematic view of the device of the present invention installed in Figure 1 for balanced powder supply and weight distribution
  • FIG. 4 is a schematic view of the control device of the present invention installed in FIG. 1 for achieving balanced powder supply, balanced air supply, and weight distribution;
  • Figure 5 is a block diagram of the method for controlling the powder supply according to the weight of pulverized coal and controlling the weight according to the weight.
  • Figure 1 is a schematic diagram of the main equipment of a coal grinding mechanism powder and powder supply system.
  • 2(a), 2(b), 3, and 4 are schematic views of different devices included in the control device of the present invention when they are completed in different tasks, which are installed in FIG.
  • the apparatus or measuring device included in the control device of the present invention completes the task of supplying powder and distributing air together with the equipment of the existing milling and powder supplying system, and the device or device to be included in the control device of the present invention is Existing in Figure 1, can not be added in the implementation.
  • Fig. 2(a) and Fig. 2(b) The embodiment of Fig. 2(a) and Fig. 2(b) is to complete the air distribution control according to the total weight of the coal powder, so that the ratio of the total weight of the coal powder to the total amount of the secondary air distribution is consistent with the excess air ⁇ , which is insufficient.
  • the ratio of the pulverized coal weight of each branch of the primary wind to the air distribution of each branch of the secondary air varies greatly from each other, affecting the quality of combustion.
  • the schemes are consistent with W A , W B , W C and W D , thereby reducing the difference between the weight of the pulverized coal of each branch pipeline and the ratio of the air distribution of each branch, and improving the branches.
  • the distribution quality is the preferred embodiment of the invention.
  • the embodiment of Fig. 4 is a balanced powder supply and balanced air supply and weight distribution control scheme, which can achieve the same weight of coal powder in each branch of the primary wind, and the air supply volume of each branch of the secondary air is consistent, and the weight and distribution of each branch The air distribution ratio of the air volume is also consistent, and the distribution ratio is consistent with a given excess air ratio ⁇ .
  • This embodiment is the preferred embodiment.
  • FIG. 5 is a block diagram of the control method of the present invention, in which:
  • Steps 1, 2, and 3 are completed to control the weight distribution of coal powder; steps 1, 2, 3, and 4.1 are completed according to the total weight of coal powder W; and steps 1, 2, 3, and 4.2 are completed to provide balanced powder supply. And according to the pulverized coal weight distribution control; steps 1, 2, 3, 4.3 is to complete the balanced powder supply, balanced supply of air and pulverized coal weight control.
  • the invention Compared with the existing milling and powder feeding system, the invention has uniform powder supply and uniform air supply, and the ratio of the weight of the pulverized coal powder to the air distribution volume of each branch is consistent, and the ratio is consistent with a given excess air coefficient, thereby achieving Boiler pulverized coal combustion is centered in flame stability, heat load, uniform temperature distribution, pulverized coal combustion is in full, efficient and optimal state, which improves thermal efficiency, reduces flue gas heat loss, reduces pollutant production, and brings to the enterprise Considerable economic and social benefits.
  • control device of the present invention can be completed independently:

Abstract

一种按重量均衡供粉和按重量配风控制装置及其控制方法,该装置包括风送煤粉重量测量装置(12、12A、12B、12C、12D)、一次风风速测量装置(11、11A、11B、11C、11D)、二次风风速测量装置(14、14A、14B、14C、14D)、一次风风机(4)和二次风风机(10)。控制方法包括将该装置安装在现有燃煤锅炉制粉、供粉系统中,对各风送管道煤粉重量进行测量和均衡供粉控制,并根据煤粉重量进行配风控制,使煤粉重量与配风量之比满足给定的过剩空气系数α要求。各支路管道入炉煤粉重量相一致,各支路管道煤粉重量与配风量之比相一致,使锅炉煤粉燃烧稳定、热负荷、温度分布均匀,煤粉燃烧充分高效,提高了锅炉运行的稳定性、安全性和经济性。

Description

按煤粉重量均衡供粉和按重量配风控制装置及其控制方法 技术领域
涉及燃煤锅炉按重量均衡供粉和按重量配风。
背景技术
燃煤锅炉,诸如燃煤电站锅炉、大型供热锅炉、工业锅炉、水泥窑锅炉均采用风送管道给锅炉供粉,例如:大型电站锅炉的制粉、供粉系统,采用多层供粉,每层用一台磨煤机制粉,带多个风送管道供粉。大型锅炉通常是三层——六层供粉,每层用一台磨煤机,带四个管道,共计12-24个管道,各层所用设备相同。以一层制粉、供粉设备表述如下(如图1所示):
一定质量煤粉入炉燃烧,需配一定体积的空气。1Kg(或1m3)燃料完全燃烧(燃烧后无剩余氧气)所需的最低限度的空气量(以V0表示)称为理论空气量,锅炉运行时,为使燃料燃尽,实际供给的空气量(以Vk表示),总是略大于理论空气量V0,其
Figure PCTCN2017000410-appb-000001
称为过剩空气系数,即:
Figure PCTCN2017000410-appb-000002
α——用烟气量表示,β——用空气量表示;
燃料重量W(kg)完全燃烧需配空气量为:
Figure PCTCN2017000410-appb-000003
过剩空气系数大小,除直接影响煤粉能否完全燃烧外,还会影响燃料着火、燃烧稳定性和烟气中热量损耗及污染物产生量。可见α或β是锅炉运行的重要参数。
现有制粉、供粉系统是用两个回路对
Figure PCTCN2017000410-appb-000004
比值进行调节的。一是燃料量调节回路,燃料量跟踪发电所需热负荷调节,二是根据烟气中含氧量调节配风量,维持过剩空气系数α在设定的一定范围内,含氧量与α关系:
Figure PCTCN2017000410-appb-000005
O2——氧气量
知道了氧气含量,由(3)式可计算出过剩空气系数α。
现有制粉、供粉系统调节燃料量/配风量存在问题有:
1、根据烟气含氧量调节配风量,是一种迟后调节,烟气含氧量只反映煤粉燃烧状况(燃烧不足、燃烧过度、完全燃烧)。这种迟后调节,不能根据煤粉重量调节配风量,使
Figure PCTCN2017000410-appb-000006
之比实时达到煤粉完全燃烧条件;
2、现有制粉、供粉系统,各支路风送管道煤粉重量变化及各支路管道重量偏差变化与二次风各支路配风量变化及偏差变化相互影响,造成各支路
Figure PCTCN2017000410-appb-000007
之比变化大,从而引起炉内燃烧不均、不稳和燃烧质量下降,例如烟气中氧气含量多,应下调配风量,但此时如果入炉煤粉量正在增加,配风量下调会造成相反的配风效果。
针对上述存在问题,本发明公开了一种“按煤粉重量均衡供粉和按重量配风控制装置及其控制方法”,可实现按重量均衡供粉和按重量配风控制。
发明内容
本发明的控制装置是由两个控制回路构成,一是入炉煤粉重量和二次风风量均衡控制回路,二是根据煤粉重量配风控制回路。所解决的技术问题是:
1、采用“风送煤粉重量测量装置”,解决风送煤粉管道内煤粉重量测量问题;
2、采用均衡控制技术,解决一次风各支路管道煤粉重量WA、WB、WC、WD相一致均衡供粉问题;
3、采用均衡控制技术,解决二次风各支路管道配风量V2A、V2B、V3C、V4D相一致均衡配风问题,实现均衡供粉、均衡供风,可使炉内煤粉燃烧均匀、稳定,提高了燃烧质量;
4、根据均衡后煤粉重量和均衡后配风量,采用自动跟踪变参数(变设定控制值)的控制技术,使各支路煤粉重量与各支路配风量即
Figure PCTCN2017000410-appb-000008
之比相一致,该配风比又与给定的过剩空气系数α相一致,满足入炉煤粉重量完全燃烧条件,使其能充分、高效燃烧。
本发明的一种“按重量均衡供粉和按重量配风控制装置”,安装在现有燃煤锅炉制粉、供粉系统中,其技术特征在于,包括:
风送煤粉重量测量装置(12)或(12A)、(12B)、(12C)、(12D),安装在一次风送管道总管(6)或支管(6A)、(6B)、(6C)、(6D)上面,用于测量总管或支管内煤粉重量W或WA、WB、WC、WD
一次风风机(4)(系现有制粉、供粉系统设备),安装在磨煤机(2)前方,用于产生一次风,并将磨成的煤粉带入一次风送管道,送至燃烧器(7A)、(7B)、(7C)、(7D);
一次风速测量装置(11),安装在一次风送管道总管(6)或各支管(6A)、(6B)、(6C)、(6D)上,用于测量一次风送管道总管风速ν1或支管风速ν1A、ν1B、ν1C、ν1D
二次风风机(10)(系现有制粉、供粉系统设备),安装在二次风风送管道起始端,用于产生二次风并送至燃烧器(7A)、(7B)、(7C)、(7D);
二次风风速测量装置(14),安装在二次风风送管道总管道(9)或各支管道(9A)、(9B)、(9C)、(9D)上,用于测量二次风风送管道(9)风速ν2或ν2A、ν2B、ν2C、ν2D
数据采集控制器(13),用于接收风送煤粉重量测量装置(12)或(12A)、(12B)、(12C)、(12D)信号W或WA、WB、WC、WD,一次风速测量装置(11)或(11A)、(11B)、(11C)、(11D)信号ν1或ν1A、ν1B、ν1C、ν1D、和二次风速测量装置(14)或(14A)、(14B)、(14C)、(14D)信号ν2或ν2A、ν2B、ν2C、ν2D
数据采集控制器(13)根据接收信号和给定的过剩空气系数α进行均衡供粉控制和按重量配风控制。
“按煤粉重量均衡供粉和按重量配风控制装置”其特征在于,数据采集控制器(13)采用均衡控制技术,对WA、WB、WC、WD进行调节控制,使WA、WB、WC、WD相一致。
“按煤粉重量均衡供粉和按重量配风控制装置”其特征在于,数据采集控制器(13),根据煤粉总重量W和给定过剩空气系数α,计算出W所需二次配风量
Figure PCTCN2017000410-appb-000009
Figure PCTCN2017000410-appb-000010
并根据
Figure PCTCN2017000410-appb-000011
对二次风风机转速进行调节控制,以增加或减少V2,使V2
Figure PCTCN2017000410-appb-000012
相一致。
“按煤粉重量均衡供粉和按重量配风控制装置”其特征在于,数据采集控制器(13)计算出各管道均衡后煤粉重量总和W(W=WA+WB+WC+WD),及给定过 剩空气系数α,计算W所需二次配风量
Figure PCTCN2017000410-appb-000013
Figure PCTCN2017000410-appb-000014
依据
Figure PCTCN2017000410-appb-000015
对二次风风机转速进行调节控制,以增加或减少V2,使V2
Figure PCTCN2017000410-appb-000016
相一致。
“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,还包括一个风速调节装置(15),安装二次风送总管道(9)和支路管道(9A)、(9B)、(9C)、(9D)之间,用于调节进入二次风各支路管道内风速ν2A、ν2B、ν2C、ν2D,也就是调节与其相对应的风量V2A、V2B、V3C、V4D
“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,数据采集控制器(13),采用均衡控制技术,对风速调节装置(15)发出控制信号,调节ν2A、ν2B、ν2C、ν2D,使V2A、V2B、V3C、V4D相一致。
“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,所述均衡控制技术是:数据采集控制器(13)计算出
Figure PCTCN2017000410-appb-000017
Figure PCTCN2017000410-appb-000018
以W或V2平作为设定控制值,计算出ΔWA=W-WA,ΔWB=W-WB,ΔWC=W-WC,ΔWD=W-WD或ΔV2A=V2平-V2A,ΔV2B=V2平-V2B,ΔV2C=V2平-V2C,ΔV2D=V2平-V2D;根据ΔWA、ΔWB、ΔWC、ΔWD对煤粉分配器(5)发出控制信号,使WA、WB、WC、WD与W相一致;或根据ΔV2A、ΔV2B、ΔV2C、ΔV2D对风速调节装置(15)发出调节控制信号,使V2A、V2B、V2C、V2D与V2平相一致。
“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,数据采集控制器根据均衡后,一次风各支路煤粉重量之和W(W=WA+WB+WC+WD)和均衡后二次风各支路风量之和V2(V2=VA+VB+VC+VD),以及给过剩空气系数α,计算W值所需的二次风配风量
Figure PCTCN2017000410-appb-000019
和其差值
Figure PCTCN2017000410-appb-000020
并以
Figure PCTCN2017000410-appb-000021
调节二次风风机转速,增加或减少V2,使V2
Figure PCTCN2017000410-appb-000022
相一致。
目前风送煤粉重量测量方法主要有:电离辐射法、热平衡法、能量法、光-电检测法、电容法、微波法、电容层析成像法、激光法、静电感应法等,本发明控制装置中风送煤粉重量测量装置可选择上述方法的任何一种风送煤粉重量测量装置。
“按重量均衡供粉和按重量配风装置”,其特征在于,“风送煤粉重量测量装置”(12)是电离辐射式风送煤粉重量测量装置或是热平衡法风送煤粉重 量测量装置,或是能量法风送煤粉测量装置,或是光-电检测法风送煤粉重量测量装置,或是电容法风送煤粉测量装置,或是电容层析成像法风送煤粉重量测量装置,或是微波法风送煤粉重量测量装置,或是激光法风送煤粉重量测量装置,或是静电感应法风送煤粉重量测量装置。
“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,一次风速测量装置和二次风速测量装置是差压式风速测量装置或是靠背管式风速测量装置或是笛形管式风速测量装置,或是机翼式风速测量装置,或是双文丘里管式风速测量装置。
一种“按煤粉重量均衡供粉和按重量配风控制装置”的控制方法,其特征在于,包括如下步骤:
步骤1,数据采集,数据采集控制器采集如下信号:
(1)煤粉重量信号W或WA、WB、WC、WD
(2)一次风速信号ν1或ν1A、ν1B、ν1C、ν1D
(3)二次风速信号ν2或ν2A、ν2B、ν2C、ν2D
步骤2,均衡供粉,数据采集控制器(13)采用均衡控制技术,对煤粉分配器(5)进行调节控制,使WA、WB、WC、WD相一致;
步骤3,判断是否还需要配风控制
NO——返回
Yes——进行配风控制
步骤4,按重量配风控制
步骤4.1按煤粉总重量进行配风控制
数据采集控制器(13),根据总重量W和给定α值,计算出W所需要的配风量
Figure PCTCN2017000410-appb-000023
及差值
Figure PCTCN2017000410-appb-000024
并按
Figure PCTCN2017000410-appb-000025
对二次风机进行调节控制,使V2
Figure PCTCN2017000410-appb-000026
相一致;
步骤4.2按均衡供粉重量配风控制
数据采集控制器(13),根据W=WA+WB+WC+WD和给定α系数,计算出W所需配风量
Figure PCTCN2017000410-appb-000027
及差值
Figure PCTCN2017000410-appb-000028
并按
Figure PCTCN2017000410-appb-000029
对二次风风机进行调节控制,使V2
Figure PCTCN2017000410-appb-000030
相一致;
步骤4.3按均衡煤粉重量和均衡二次风量进行配风控制
数据采集控制器(13)利用均衡控制技术,对煤粉分配器(5)进行控制, 使WA、WB、WC、WD相一致;利用均衡控制技术,对风速调节装置(15)进行控制,使V2A、V2B、V2C、V2D相一致,并计算出W=WA+WB+WC+WD和V2=V2A+V2B+V2C+V2D,根据W和α,计算出W所需
Figure PCTCN2017000410-appb-000031
Figure PCTCN2017000410-appb-000032
并按
Figure PCTCN2017000410-appb-000033
对二次风风机进行控制,使V2
Figure PCTCN2017000410-appb-000034
相一致。
附图说明
图1一层一台磨煤机制粉、供粉系统主要设备示意图
1——给煤机
2——磨煤机
3——粗、细粉分离器
4——一次风风机
5——煤粉分配器
6——一次风总管道
6A、6B、6C、6D——一次风支路管道
7A、7B、7C、7D——燃烧器
8——锅炉
9——二次风总管道
9A、9B、9C、9D——二次风支路管道
10——二次风风机
图2(a)发明控制装置安装在图1中总管道上示意图
11——一次风风速测量装置
12——风送煤粉重量测量装置
13——数据采集控制器
14——二次风风速测量装置
图2(b)发明控制装置安装在图1中各支路风送管道示意图
12A,12B,12C,12D——风送煤粉重量测量装置
11A,11B,11C,11D——一次风风速测量装置
13——数据采集控制器
14——二次风风速测量装置
图3本发明装置安装在图1中实现均衡供粉、按重量配风示意图
12A、12B、12C、12D——风送煤粉重量测量装置
图4本发明控制装置安装在图1中实现均衡供粉、均衡供风和重量配风示意图
14A、14B、14C、14D——二次风风速测量装置
15——风速调节装置
图5按煤粉重量均衡供粉控制和按重量配风控制方法框图
具体实施方式
结合附图对本发明的技术方案和实施进一步说明如下:
图1是一层一台磨煤机制粉、供粉系统主要设备示意图。图2(a)、图2(b)、图3、图4是本发明控制装置在完成不同任务时所包含的不同装置,安装在图1中的示意图。再此要说明的是,本发明控制装置所包括的设备或测量装置与现有制粉、供粉系统的设备一起完成供粉和配风任务,本发明控制装置应包括的设备或装置,在图1中已有的,在实施中可不再增设。
图2(a)风送煤粉重量测量装置(12)安装在风送管道总管道(6)上,用于测出风送管道(6)煤粉总重量W,风速测量装置(11)安装在风送管道(6)上,用于测出风速ν1,依此计算出风量V1=ν1×πd1 2,d1——一次风送管道直径,风送测速装置(14)测出二次风送管道风速ν2,依此计算出风量V2=ν2×πd2 2,d2——二次风送管道直径;图2(b)风送煤粉重量测量装置(12A)、(12B)、(12C)、(12D)安装在支路管道(6A)、(6B)、(6C)、(6D)上,用于测出各支路管道煤粉重量WA、WB、WC、WD,风速测量装置(11A)、(11B)、(11C)、(11D)也安装在支路管道(6A)、(6B)、(6C)、(6D)上,用于测出ν1A、ν1B、ν1C、ν1D,并计算出W=WA+WB+WC+WD和V1=V1A+V1B+V1C+V1D,图2(a)、图2(b)之数据采集控制器根据W和过剩空气系数α计算出W所需的二次配风量
Figure PCTCN2017000410-appb-000035
Figure PCTCN2017000410-appb-000036
并按
Figure PCTCN2017000410-appb-000037
对二次风风机进行调节控制,使V2
Figure PCTCN2017000410-appb-000038
相一致。
图2(a)、图2(b)的实施方案是按煤粉总重量完成配风控制,从而实现煤粉总重量与二次配风总量之比与过剩空气α相一致,其不足之处是,一次风各支路管道煤粉重量与二次风各支路配风量之比互相间相差较大,影响燃烧质量。
图3实施方案,所完成的任务是:
(1)实现煤粉重量均衡供粉;
(2)根据均衡煤粉重量进行配风控制。
该方案由于均衡供粉,使WA、WB、WC、WD相一致,从而减少了各支路管道煤粉重量与各支路配风量之比之间的差异,提高了各支路配风质量,该方案是本发明的优选方案之。
图4实施方案是均衡供粉和均衡供风和重量配风控制方案,可实现一次风各支路煤粉重量相一致,二次风各支路供风量相一致,各支路的重量与配风量的配风比也相一致,并且该配风比与给定的过剩空气系数α相一致。该实施方案是最佳实施方案。
图5是本发明控制方法的框图,图中:
步骤1、2、3是完成煤粉重量均衡供粉控制;步骤1、2、3、4.1是完成按煤粉总重量W进行配风控制;步骤1、2、3、4.2是完成均衡供粉和按煤粉重量配风控制;步骤1、2、3、4.3是完成均衡供粉、均衡供风和按煤粉重量配风控制。
本发明与现有制粉、供粉系统相比,具有供粉均匀,供风均匀,各支路煤粉重量与配风量之比一致,且该比值与给定过剩空气系数相一致,从而达到锅炉煤粉燃烧处于中心火焰稳定、热负荷、温度分布均匀、煤粉燃烧处于充分、高效最佳状态,提高了热效率,降低了烟气热损耗,减少了污染物生成量,为企业带来了可观的经济效益和社会效益。
本发明的控制装置可独立完成:
1、煤粉重量均衡供粉控制;
2、按煤粉重量配风控制;
3、均衡供粉控制、均衡供风控制和按重量配风控制。
以上功能控制均属于本专利的保护范围。

Claims (11)

  1. 一种按重量均衡供粉和按重量配风控制装置,安装在现有燃煤锅炉制粉、供粉系统中,其技术特征在于,包括:
    风送煤粉重量测量装置(12)或(12A)、(12B)、(12C)、(12D),安装在一次风送管道总管(6)或支管(6A)、(6B)、(6C)、(6D)上面,用于测量总管或支管内煤粉重量W或WA、WB、WC、WD
    一次风风机(4)(系现有煤粉制备系统设备),安装在磨煤机(2)前方,用于产生一次风,并将磨成的煤粉带入一次风送管道,送至燃烧器(7A)、(7B)、(7C)、(7D);
    一次风速测量装置(11),安装在一次风送管道总管(6)或各支管(6A)、(6B)、(6C)、(6D)上,用于测量一次风送管道总管风速
    Figure PCTCN2017000410-appb-100001
    或支管风速
    Figure PCTCN2017000410-appb-100002
    二次风风机(10)(系现有煤粉制备系统设备),安装在二次风风送管道起始端,用于产生二次风并送至燃烧器(7A)、(7B)、(7C)、(7D);
    二次风风速测量装置,安装在二次风风送管道总管道(9)或各支管道(9A)、(9B)、(9C)、(9D)上,用于测量二次风风送管道(9)风速
    Figure PCTCN2017000410-appb-100003
    或各支路管道
    Figure PCTCN2017000410-appb-100004
    数据采集控制器(13),用于接收风送煤粉重量测量装置12或12A、12B、12C、12D信号W或WA、WB、WC、WD、一次风速测量装置(11)或(11A)、(11B)、(11C)、(11D)信号
    Figure PCTCN2017000410-appb-100005
    Figure PCTCN2017000410-appb-100006
    和二次风速测量装置(14)或(14A)、(14B)、(14C)、(14D)信号
    Figure PCTCN2017000410-appb-100007
    Figure PCTCN2017000410-appb-100008
    数据采集控制器(13)根据接收信号和给定的过剩空气系数α进行均衡供粉控制和按重量配风控制。
  2. 根据权利要求1所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,数据采集控制器(13)采用均衡控制技术,对WA、WB、WC、WD进行调节控制,使WA、WB、WC、WD相一致。
  3. 根据权利要求1所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,数据采集控制器(13),根据煤粉总重量W和给定过剩空气系数α,计算出W所需二次配风量
    Figure PCTCN2017000410-appb-100009
    Figure PCTCN2017000410-appb-100010
    并根据
    Figure PCTCN2017000410-appb-100011
    对二次风机转速进行调节控制,以增加或减少V2,使V2
    Figure PCTCN2017000410-appb-100012
    相一致。
  4. 根据权利要求1所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,数据采集控制器(13)计算出各管道均衡后煤粉重量总和W(WA+WB+WC+WD),并根据W和给定过剩空气系数α计算W所需二次配风量
    Figure PCTCN2017000410-appb-100013
    Figure PCTCN2017000410-appb-100014
    依据
    Figure PCTCN2017000410-appb-100015
    对二次风机转速进行调节控制,以增加或减少V2,使V2
    Figure PCTCN2017000410-appb-100016
    相一致。
  5. 根据权利要求1所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,还包括一个风速调节装置(15),安装二次风送总管道(9)和支路管道(9A)、(9B)、(9C)、(9D)之间,用于调节进入各支管道内风速
    Figure PCTCN2017000410-appb-100017
    也就是调节与其相对应的风量V2A、V2B、V2C、V2D
  6. 根据权利要求1、5所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,数据采集控制器(13)采用均衡控制技术,对风速调节装置(15)发出控制信号,调节
    Figure PCTCN2017000410-appb-100018
    使风量V2A、V2B、V2C、V2D相一致。
  7. 根据权利要求1、2、6所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,所述均衡控制技术是:数据采集控制器(13)计算出
    Figure PCTCN2017000410-appb-100019
    Figure PCTCN2017000410-appb-100020
    以W或V2平作为设定控制值,计算出ΔWA=W-WA,ΔWB=W-WB,ΔWC=W-WC,ΔWD=W-WD或ΔV2A=V2平-V2A,ΔV2B=V2平-V2B,ΔV2C=V2平-V2C,ΔV2D=V2平-V2D;根据ΔWA、ΔWB、ΔWC、ΔWD对煤粉分配器(5)发出调节控制信号,使WA、WB、WC、WD与W相一致;或根据ΔV2A、ΔV2B、ΔV2C、ΔV2D对风速调节装置(15)发出控制信号,使V2A、V2B、V2C、V2D与V2平相一致。
  8. 根据权利要求1、2、6所述,按煤粉重量均衡供粉和按重量配风控制装置,其特征在于,数据采集控制器(13),根据均衡后一次风各路煤粉重量之和W(W=WA+WB+WC+WD)、均衡后二次风各支路配风量之和V2(V2=V2A+V2B+V2C+V2D)以及给过剩空气系数α,计算W值所需的二次风配风量
    Figure PCTCN2017000410-appb-100021
    和其差值
    Figure PCTCN2017000410-appb-100022
    并以
    Figure PCTCN2017000410-appb-100023
    调节二次风风机转速,增加或减少V2,使V2
    Figure PCTCN2017000410-appb-100024
    相一致。
  9. 根据权利要求1所述,按重量均衡供粉和按重量配风装置,其特征在于,“风送煤粉重量测量装置”(12)是电离辐射式风送煤粉重量测量装置,或是 热平衡法风送煤粉重量测量装置,或是能量法风送煤粉测量装置,或是光-电检测风送煤粉重量测量装置,或是电容法风送煤粉测量装置,或是电容层析成像法风送煤粉重量测量装置,或是微波法风送煤粉重量测量装置,或是激光法风送煤粉重量测量装置,或是静电感应法风送煤粉重量测量装置。
  10. 根据权利要求1所述,“按煤粉重量均衡供粉和按重量配风控制装置”,其特征在于,一次风速测量装置和二次风速测量装置是差压式风速测量装置或是靠背管式风速测量装置或是笛形管式风速测量装置,或是机翼式风速测量装置,或是双文丘里管式风速测量装置。
  11. 根据权利要求1-10所述,“按煤粉重量均衡供粉和按重量配风控制装置”的控制方法,其特征在于,包括如下步骤:
    步骤1,数据采集,数据采集控制器(13)采集如下信号:
    (1)煤粉重量信号W或WA、WB、WC、WD
    (2)一次风速信号
    Figure PCTCN2017000410-appb-100025
    Figure PCTCN2017000410-appb-100026
    (3)二次风速信号
    Figure PCTCN2017000410-appb-100027
    Figure PCTCN2017000410-appb-100028
    步骤2,均衡供粉,数据采集控制器(13)采用均衡控制技术,对煤粉分配器(5)进行调节控制,使WA、WB、WC、WD相一致;
    步骤3,判断是否还需要配风控制
    NO——返回
    Yes——进行配风控制;
    步骤4,按重量配风控制
    步骤4.1按煤粉总重量进行配风控制
    数据采集控制器,根据总重量W和给定α值,计算出所需要的配风量
    Figure PCTCN2017000410-appb-100029
    及差值
    Figure PCTCN2017000410-appb-100030
    并按
    Figure PCTCN2017000410-appb-100031
    对二次风风机进行调节控制,使V2
    Figure PCTCN2017000410-appb-100032
    相一致;
    步骤4.2按均衡供粉重量配风控制
    数据采集控制器(13),根据W=WA+WB+WC+WD和给定系数α,计算出W所需配风量
    Figure PCTCN2017000410-appb-100033
    及差值
    Figure PCTCN2017000410-appb-100034
    并按
    Figure PCTCN2017000410-appb-100035
    对二次风风机进行调节控制,使V2
    Figure PCTCN2017000410-appb-100036
    相一致;
    步骤4.3按均衡煤粉重量和均衡二次风风量进行配风控制
    数据采集控制器(13)利用均衡控制技术,对煤粉分配器(5)进行控制,使WA、WB、WC、WD相一致;利用均衡控制技术,对风速调节装置(15)进行控制,使V2A、V2B、V2C、V2D相一致,并计算出W=WA+WB+WC+WD及V2=V2A+V2B+V2C+V2D, 根据W和α计算出W所需配风量
    Figure PCTCN2017000410-appb-100037
    Figure PCTCN2017000410-appb-100038
    并按
    Figure PCTCN2017000410-appb-100039
    对二次风风机进行调节控制,使V2
    Figure PCTCN2017000410-appb-100040
    相一致。
PCT/CN2017/000410 2016-12-28 2017-06-27 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法 WO2018120256A1 (zh)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201621449630.8 2016-12-28
CN201611225253.4 2016-12-28
CN201611225253.4A CN106989412B (zh) 2016-12-28 2016-12-28 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法
CN201621449630.8U CN208635143U (zh) 2016-12-28 2016-12-28 按煤粉重量均衡供粉和按重量配风控制装置

Publications (1)

Publication Number Publication Date
WO2018120256A1 true WO2018120256A1 (zh) 2018-07-05

Family

ID=62710871

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2017/000410 WO2018120256A1 (zh) 2016-12-28 2017-06-27 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法

Country Status (1)

Country Link
WO (1) WO2018120256A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108954372A (zh) * 2018-07-31 2018-12-07 大唐东北电力试验研究院有限公司 一种锅炉一次风在线调平系统
CN111810984A (zh) * 2020-07-10 2020-10-23 浙江浙能技术研究院有限公司 一次风机适配汽轮机增容改造的优化控制方法
CN112050198A (zh) * 2020-08-19 2020-12-08 神华神东电力有限责任公司 一种锅炉系统
CN113687098A (zh) * 2021-07-19 2021-11-23 中国大唐集团科学技术研究院有限公司火力发电技术研究院 一种煤电机组差压式粉管风速测量装置及方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221616A (ja) * 1984-04-18 1985-11-06 Babcock Hitachi Kk 微粉炭供給装置
CN1180408A (zh) * 1995-02-11 1998-04-29 厄恩斯特·赖克 用于测定气流中的固体组份的方法
KR20080058639A (ko) * 2006-12-22 2008-06-26 주식회사 포스코 공기밀도를 이용한 미분탄 취입제어 장치
US20110197831A1 (en) * 2007-04-13 2011-08-18 Babcock-Hitachi Kabushiki Kaisha Pulverized Coal Burning Boiler
CN103939939A (zh) * 2014-03-13 2014-07-23 青岛立宇科技开发有限公司 煤粉锅炉数字化燃烧控制和优化方法及系统
CN104728854A (zh) * 2013-12-20 2015-06-24 邸生才 具有风送煤粉热量测量与控制的煤粉制备系统及方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60221616A (ja) * 1984-04-18 1985-11-06 Babcock Hitachi Kk 微粉炭供給装置
CN1180408A (zh) * 1995-02-11 1998-04-29 厄恩斯特·赖克 用于测定气流中的固体组份的方法
KR20080058639A (ko) * 2006-12-22 2008-06-26 주식회사 포스코 공기밀도를 이용한 미분탄 취입제어 장치
US20110197831A1 (en) * 2007-04-13 2011-08-18 Babcock-Hitachi Kabushiki Kaisha Pulverized Coal Burning Boiler
CN104728854A (zh) * 2013-12-20 2015-06-24 邸生才 具有风送煤粉热量测量与控制的煤粉制备系统及方法
CN103939939A (zh) * 2014-03-13 2014-07-23 青岛立宇科技开发有限公司 煤粉锅炉数字化燃烧控制和优化方法及系统

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108954372A (zh) * 2018-07-31 2018-12-07 大唐东北电力试验研究院有限公司 一种锅炉一次风在线调平系统
CN111810984A (zh) * 2020-07-10 2020-10-23 浙江浙能技术研究院有限公司 一次风机适配汽轮机增容改造的优化控制方法
CN112050198A (zh) * 2020-08-19 2020-12-08 神华神东电力有限责任公司 一种锅炉系统
CN113687098A (zh) * 2021-07-19 2021-11-23 中国大唐集团科学技术研究院有限公司火力发电技术研究院 一种煤电机组差压式粉管风速测量装置及方法

Similar Documents

Publication Publication Date Title
WO2018120256A1 (zh) 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法
CN103939939B (zh) 煤粉锅炉数字化燃烧控制和优化方法及系统
CN103423765B (zh) 一种用于降低nox排放的配风耦合燃烧方法及系统
CN109681907A (zh) 一种燃煤电厂锅炉变负荷风煤匹配控制装置与方法
Luo et al. Principles of optimization of combustion by radiant energy signal and its application in a 660 MWe down-and coal-fired boiler
CN103807852B (zh) 煤粉锅炉的二次风配风装置及二次风配风方法
CN106989412B (zh) 按煤粉重量均衡供粉和按重量配风控制装置及其控制方法
CN105509035B (zh) 一种确定对冲燃烧进风量的方法、装置及自动控制系统
CN106556026A (zh) 风送管道煤粉重量测量仪及多个管道均衡供粉控制系统
CN209876975U (zh) 燃煤电厂锅炉变负荷风煤匹配控制装置
CN208635143U (zh) 按煤粉重量均衡供粉和按重量配风控制装置
CN102980740B (zh) 旋流燃烧器冷态空气动力场测量方法及专属测量仪器
CN205898268U (zh) 辐射式风送管道煤粉重量测量仪及多个管道均衡供粉控制系统
US6659026B1 (en) Control system for reducing NOx emissions from a multiple-intertube pulverized-coal burner using true delivery pipe fuel flow measurement
CN104728854B (zh) 具有风送煤粉热量测量与控制的煤粉制备系统及方法
CN102116484B (zh) 一种褐煤机组的燃烧控制方法及系统
CN207539925U (zh) 电站锅炉二次风门自动调风控制系统
CN204042968U (zh) 煤粉锅炉数字化燃烧控制和优化系统
CN207455557U (zh) 一种注汽锅炉干度与热效率自动监测及优化控制系统
CN202371749U (zh) 煤粉锅炉单火嘴风粉在线精确控制系统
CN204084340U (zh) 煤粉锅炉的二次风配风装置
CN204739578U (zh) 一种燃烧效率可调节流化床锅炉
CN106865958B (zh) 一种玻璃熔窑燃烧火焰优化控制方法
CN204830009U (zh) 一种用于测量煤粉锅炉管道内的煤粉浓度和风速的装置
CN110388654A (zh) 一种基于在线测量的一次风粉均衡方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17888070

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 17888070

Country of ref document: EP

Kind code of ref document: A1