The utility model discloses a system for removing the coupling of low-pressure cylinder intake operation and low-pressure economizer, which comprises a medium-pressure cylinder, a low-pressure connecting pipe sealing valve, a low-pressure cylinder, a low-temperature heat network circulating water pipe, a low-pressure economizer, a heat network heater and a heat network drainage pump; a middle-low-pressure connecting pipe sealing valve is located between the outlet of the medium-pressure cylinder and the inlet of the low-pressure cylinder; and the outlet of the medium-pressure cylinder is also connected with The shell side inlet is connected, and the heat network drainage pump is located at the shell side outlet of the heat network heater; the low-temperature heat network circulating water pipe is connected at the tube side inlet of the heat network heater; the low-pressure economizer water side inlet is connected with the low-temperature heat network circulating water pipe; the low-pressure economizer outlet pipe is connected with the heat network drainage water pipe; and the low-pressure economizer flue gas side inlet is connected with the gas preheater outlet exhaust pipe. The utility model enables the low-pressure economizer system to be put into operation normally when the unit removes the low-pressure cylinder and enters the steam, and can recover the waste heat of exhaust gas, reduce the exhaust gas temperature, improve the efficiency of the electrostatic precipitator, and improve the energy-saving and environmental protection index of the unit.
【技术实现步骤摘要】
一种切除低压缸进汽运行与低压省煤器耦合的系统
本技术涉及火力发电
,具体涉及一种切除低压缸进汽运行与低压省煤器耦合的系统。
技术介绍
近年来,切除低压缸进汽供热技术,又称“低压缸零出力技术”,在国内众多供热机组上得到推广应用。该技术是对汽轮机传统运行方式的重大突破,在冬季供热期将绝大部分原低压缸进汽用于供热,低压缸通流极小流量蒸汽,提高机组供热能力;若对外供热量不变的情况下,可大幅降低机组发电功率,实现深度调峰;机组供热期间几乎没有冷源损失,大大降低了机组发电煤耗。低压省煤器系统,又称“低温省煤器系统”和“烟气余热回收系统”是目前国内火电机组普遍使用的一项节能技术。通过在空气预热器和电除尘器间的烟气管道上增设换热器,回收锅炉排烟热量加热汽轮机回热系统的低压凝结水,减少低压加热器的抽汽量,进而增加汽轮机出力。并且,烟气温度降低后进入电除尘器,体积流量减少,飞灰比电阻明显下降,可使电除尘效率提高。供热机组在切除低压缸进汽运行工况下,绝大部分中压缸排汽进入热网加热器,随后疏水可直接汇入除氧器,低压缸只有少量冷却蒸汽通过,因而凝汽器热负荷很小,凝结水量也很小。对于设 ...
【技术保护点】
1.一种切除低压缸进汽运行与低压省煤器耦合的系统,其特征在于,包括中压缸(2)、中低压联通管密封阀(7)、低压缸(8)、低温热网循环水管(11)、低压省煤器(19)、热网加热器(21)和热网疏水泵(22);中低压联通管密封阀(7)设在中压缸(2)出口与低压缸(8)入口之间;中压缸(2)的出口还与热网加热器(21)壳侧入口相连,热网疏水泵(22)设于热网加热器(21)壳侧出口处;热网加热器(21)管侧入口连接有低温热网循环水管(11);低压省煤器(19)水侧入口通过第一联络管道(13)与低温热网循环水管(11)联络,低压省煤器(19)出水管道通过第二联络管道(26)与热网加热 ...
【技术特征摘要】
1.一种切除低压缸进汽运行与低压省煤器耦合的系统,其特征在于,包括中压缸(2)、中低压联通管密封阀(7)、低压缸(8)、低温热网循环水管(11)、低压省煤器(19)、热网加热器(21)和热网疏水泵(22);中低压联通管密封阀(7)设在中压缸(2)出口与低压缸(8)入口之间;中压缸(2)的出口还与热网加热器(21)壳侧入口相连,热网疏水泵(22)设于热网加热器(21)壳侧出口处;热网加热器(21)管侧入口连接有低温热网循环水管(11);低压省煤器(19)水侧入口通过第一联络管道(13)与低温热网循环水管(11)联络,低压省煤器(19)出水管道通过第二联络管道(26)与热网加热器(21)出水管道联络;低压省煤器(19)烟气入口与空气预热器出口排烟管道(20)相连。2.根据权利要求1所述的一种切除低压缸进汽运行与低压省煤器耦合的系统,其特征在于,中压缸(2)的出口和低压缸(8)的入口之间还并联有冷却蒸汽系统,低压缸(8)出口处连接凝汽器(10)。3.根据权利要求2...
【专利技术属性】
技术研发人员:谢天,程东涛,黄嘉驷,杨荣祖,王汀,宋文希,
申请(专利权)人:西安西热节能技术有限公司,
类型:新型
国别省市:陕西,61
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