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CN112506237A - 自动调节单支尿素喷枪尿素流量分配的控制方法 - Google Patents

自动调节单支尿素喷枪尿素流量分配的控制方法 Download PDF

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CN112506237A
CN112506237A CN202011241948.8A CN202011241948A CN112506237A CN 112506237 A CN112506237 A CN 112506237A CN 202011241948 A CN202011241948 A CN 202011241948A CN 112506237 A CN112506237 A CN 112506237A
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urea
spray gun
flow
urea flow
difference value
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魏博远
杨大锚
王毓学
李会军
王卓
陈栋
刘磊
张学锋
吕世文
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Huaneng Tongchuan Zhaojin Coal Power Co Ltd
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D7/00Control of flow
    • G05D7/06Control of flow characterised by the use of electric means
    • G05D7/0617Control of flow characterised by the use of electric means specially adapted for fluid materials
    • G05D7/0629Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00Automatic controllers
    • G05B11/01Automatic controllers electric
    • G05B11/36Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G05B13/04Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
    • G05B13/042Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05DSYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00Control of flow ratio
    • G05D11/02Controlling ratio of two or more flows of fluid or fluent material
    • G05D11/13Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means
    • G05D11/131Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components
    • G05D11/132Controlling ratio of two or more flows of fluid or fluent material characterised by the use of electric means by measuring the values related to the quantity of the individual components by controlling the flow of the individual components

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Abstract

本发明公开了一种自动调节单支尿素喷枪尿素流量分配的控制方法。用脱硝总尿素流量减去脱硝实际总尿素流量,计算出当前所需总尿素流量的差值,之后乘以投入自动状态下的尿素喷枪支数所对应的系数,计算出单支尿素喷枪所需尿素流量的差值,再通过PID计算,消除单支尿素喷枪所需尿素流量的差值,使单支尿素喷枪尿素流量达到目标值,输出单支尿素喷枪尿素流量,通过该控制方法,有效消除了尿素喷枪投退时,总尿素流量扰动的问题。

Description

自动调节单支尿素喷枪尿素流量分配的控制方法
技术领域
本发明涉及火电厂脱硝自动调节控制系统,属于火电厂脱硝自动调节控制策略和参数优化领域。
背景技术
我公司#1机组为600MW亚临界汽包炉,烟气排放标准遵循《火电厂大气污染物排放标准》(GB13223-2011),其中氮氧化物排放值不能超过50mg/m3。我公司#1机组共有8支尿素喷枪,每支尿素喷枪有流量上限及流量下限限制。因此当机组负荷、煤量发生变化时,需及时投退尿素喷枪。
在原先的脱硝自动控制逻辑中,通过判断尿素喷枪投入支数,对其进行系数折算,再将折算后的系数乘以总尿素流量指令,将总尿素流量平均分配给已投入的所有尿素喷枪。
然而在机组实际运行中,我们发现以上控制方案存在缺陷:1.单支喷枪尿素流量分配控制逻辑中,未剔除未投自动的尿素喷枪。2.当投入的尿素喷枪数量发生变化时,折算系数会出现阶跃性变化,导致各支尿素喷枪尿素流量扰动,从而造成总尿素流量扰动,导致氮氧化物波动,极易造成氮氧化物排放超标。
针对以上问题,我公司专业技术人员通过不断观察和分析脱硝自动调节曲线,研究设计了一套脱硝自动调节单支尿素喷枪尿素流量分配控制方法。
发明内容
本发明的目的是提供一种自动调节单支尿素喷枪尿素流量分配的控制方法,通过PID控制对单支尿素喷枪尿素流量进行分配,消除投退尿素喷枪时,造成的总尿素流量扰动。
本发明的技术方案是:一种自动调节单支尿素喷枪尿素流量分配的控制方法,其特征是用脱硝总尿素流量减去脱硝实际总尿素流量,计算出当前所需总尿素流量的差值,之后乘以投入自动状态下的尿素喷枪支数所对应的系数,计算出单支尿素喷枪所需尿素流量的差值,再通过PID计算,消除单支尿素喷枪所需尿素流量的差值,使单支尿素喷枪尿素流量达到目标值,输出单支尿素喷枪尿素流量,通过该控制方法,有效消除了尿素喷枪投退时,总尿素流量扰动的问题。
附图说明
图1是本发明自动调节单支尿素喷枪尿素流量分配控制逻辑图。
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚,下面将对本发明的技术方案进行详细描述。显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明的实施例,本领域普通技术人员在没有付出创造性劳动的前提下所得到的所有其他实施方式,都属于本发明所保护的范围。
在火电机组脱硝环节,有数支尿素喷枪参与工作,每支尿素喷枪有流量上限及流量下限限制,因此当机组负荷、煤量发生变化时,需及时投退尿素喷枪。通过本发明的控制方法,解决了在投退尿素喷枪时,总尿素流量扰动的问题。
如图1所示,其中的几个中间点分别代表如下:
UREAFLOW代表脱硝总尿素流量指令;
REAL UREAFLOW代表脱硝实际总尿素流量;
UREAAUTONUM代表投入自动状态下的尿素喷枪支数;
SINGLE UREAFLOW SP代表单支尿素喷枪尿素流量指令差值设定值,该设定值为0;
SINGLE SCR SP代表单支尿素喷枪尿素流量指令;
用UREAFLOW脱硝总尿素流量指令减去REAL UREAFLOW脱硝实际总尿素流量,计算出当前所需总尿素流量的差值。
之后乘以UREAAUTONUM投入自动状态下的尿素喷枪支数所对应的系数,计算出单支尿素喷枪所需尿素流量的差值。最后通过PID计算,消除单支尿素喷枪所需尿素流量的差值,输出SINGLE SCR SP单支尿素喷枪尿素流量指令。通过该控制方法,有效消除了尿素喷枪投退时,总尿素流量扰动的问题。
自动状态下的尿素喷枪支数对应系数函数如表1:
Figure BDA0002768706490000031
以上所述,仅仅是本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本领域的技术人员在本发明披露的技术范围内,可轻易想到的变化或替换,都应涵盖在本发明的保护范围内。

Claims (1)

1.一种自动调节单支尿素喷枪尿素流量分配的控制方法,其特征是用脱硝总尿素流量减去脱硝实际总尿素流量,计算出当前所需总尿素流量的差值,之后乘以投入自动状态下的尿素喷枪支数所对应的系数,计算出单支尿素喷枪所需尿素流量的差值,再通过PID计算,消除单支尿素喷枪所需尿素流量的差值,使单支尿素喷枪尿素流量达到目标值,输出单支尿素喷枪尿素流量,通过该控制方法,有效消除了尿素喷枪投退时,总尿素流量扰动的问题;
自动状态下的尿素喷枪支数对应系数函数表
Figure FDA0002768706480000011
CN202011241948.8A 2020-11-09 2020-11-09 自动调节单支尿素喷枪尿素流量分配的控制方法 Withdrawn CN112506237A (zh)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140046651A (ko) * 2012-10-09 2014-04-21 현대중공업 주식회사 선박용 대형 엔진의 탈질장치
KR20150062674A (ko) * 2013-11-29 2015-06-08 현대중공업 주식회사 Scr 시스템의 우레아 공급 조절 장치 및 방법
CN105797576A (zh) * 2016-04-15 2016-07-27 中国大唐集团科学技术研究院有限公司西北分公司 一种燃煤机组脱硝喷氨控制方法
CN207462983U (zh) * 2017-11-15 2018-06-08 东方电气集团东方锅炉股份有限公司 一种主副喷枪组合运行的尿素热解系统
CN109464890A (zh) * 2018-10-24 2019-03-15 大唐陕西发电有限公司 一种基于串级变参数脱硝自动控制方法
CN111111430A (zh) * 2019-12-19 2020-05-08 华电电力科学研究院有限公司 一种用于尿素热解炉的scr脱硝调节控制方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20140046651A (ko) * 2012-10-09 2014-04-21 현대중공업 주식회사 선박용 대형 엔진의 탈질장치
KR20150062674A (ko) * 2013-11-29 2015-06-08 현대중공업 주식회사 Scr 시스템의 우레아 공급 조절 장치 및 방법
CN105797576A (zh) * 2016-04-15 2016-07-27 中国大唐集团科学技术研究院有限公司西北分公司 一种燃煤机组脱硝喷氨控制方法
CN207462983U (zh) * 2017-11-15 2018-06-08 东方电气集团东方锅炉股份有限公司 一种主副喷枪组合运行的尿素热解系统
CN109464890A (zh) * 2018-10-24 2019-03-15 大唐陕西发电有限公司 一种基于串级变参数脱硝自动控制方法
CN111111430A (zh) * 2019-12-19 2020-05-08 华电电力科学研究院有限公司 一种用于尿素热解炉的scr脱硝调节控制方法

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