吸收式熱泵回收汽機乏汽余熱技術(shù)研究
發(fā)布時間：2018-10-24 22:56
【摘要】：抽汽供熱和低真空供熱是目前熱電聯(lián)產(chǎn)集中供熱的主要方式,而基于吸收式熱泵的循環(huán)水提質(zhì)新技術(shù)具有進一步提高機組熱效率和供熱能力的潛力。工程實踐表明,降低冷源損失是提高汽輪機組效率最有效的方法。本文以中電投蒙東能源通遼發(fā)電總廠200MW抽汽機組為例,提出了基于吸收式熱泵的汽輪機乏汽熱電聯(lián)供工藝。首先應(yīng)用Matlab對溴化鋰吸收式熱泵的循環(huán)過程進行模擬,分析了驅(qū)動熱源溫度等參數(shù)對熱力過程的影響規(guī)律,并以機組設(shè)計參數(shù)為基礎(chǔ),針對額定工況和最大工況,確定了供熱負荷不變和發(fā)電功率不變兩種方案,對抽汽供熱與循環(huán)水吸收式熱泵采暖期供熱的聯(lián)產(chǎn)機組性能指標進行了對比分析。計算表明：熱泵機組供熱系數(shù)達1.65時,在發(fā)電量不變方案的額定工況條件下,循環(huán)水吸收式熱泵供熱機組熱效率達到了77.7%,供熱負荷達到83.47MW,分別比抽汽供熱提高了22.43個百分點和31.3MW,供熱能力提高了60%。最后,針對非供熱期乏汽余熱沒有回收的問題,提出了一種乏汽余熱綜合利用系統(tǒng),以熱定電,提高汽輪機乏汽資源利用率。可以采用溴化鋰吸收式熱泵機組提取凝汽器循環(huán)冷卻水的余熱加熱低加凝結(jié)水來實現(xiàn)。根據(jù)機組實際情況及經(jīng)濟性選用“一號低加抽汽作為驅(qū)動熱源加熱一號低加凝結(jié)水”方案和“三號低加抽汽作為驅(qū)動熱源加熱二級低加凝結(jié)水”方案。前者可降低發(fā)電煤耗0.21g/kWh,后者可降低發(fā)電煤耗0.25g/kWh,一共可以降低發(fā)電煤耗0.46 g/kWh。研究表明,循環(huán)水吸收式熱泵將低品位循環(huán)水余熱加以提質(zhì)利用,降低了機組冷源損失,提高了機組熱效率和供熱負荷,而提出的汽輪機乏汽余熱綜合利用工藝,將實現(xiàn)汽輪機組收益最大化。研究結(jié)果可為抽汽機組的節(jié)能改造提供思路及方案。
[Abstract]:Extraction heating and low vacuum heating are the main ways of heat and power cogeneration centralized heating, and the new technology of circulating water quality improvement based on absorption heat pump has the potential to further improve the heat efficiency and heating capacity of the unit. The engineering practice shows that reducing the loss of cold source is the most effective method to improve the efficiency of steam turbine unit. In this paper, taking the 200MW pumping unit of CNEC Mendong Energy Tongliao General Power Plant as an example, a combined steam turbine heat and power supply process based on absorption heat pump is proposed. Firstly, the circulating process of libr absorption heat pump is simulated by Matlab, and the influence of driving heat source temperature and other parameters on thermal process is analyzed. Based on the design parameters of the unit, the rated and maximum operating conditions are analyzed. The two schemes of constant heating load and power invariant are determined. The performance indexes of cogeneration units in heating period of extraction steam heating and circulating water absorption heat pump are compared and analyzed. The calculation shows that when the heat supply coefficient of the heat pump unit reaches 1.65, under the condition of rated working condition of the constant power generation scheme, The heat efficiency of circulating water absorption heat pump is 77.7%, the heating load is 83.47 MW, which is 22.43% and 31.3MW higher than that of extraction heating, respectively, and the heating capacity is increased by 60%. Finally, aiming at the problem that the waste heat of the steam is not recovered in the non-heat supply period, a comprehensive utilization system of the waste heat of the spent steam is put forward to improve the utilization ratio of the spent steam resource of the steam turbine. Lithium bromide absorption heat pump unit can be used to extract the condenser circulating cooling water by low heating and condensate. According to the actual situation and economy of the unit, the scheme of "No. 1 low adding steam extraction as driving heat source to heat 1 low additive condensate water" and "No. 3 low add steam extraction steam as driving heat source to heat secondary low adding condensate water" is selected. The former can reduce coal consumption by 0.21g / kWhand the latter by 0.25g / kWh. the total coal consumption can be reduced by 0.46g / kWh. The research results show that the waste heat of low grade circulating water can be extracted and utilized by circulating water absorption heat pump, which can reduce the loss of unit cold source, improve the heat efficiency and heat supply load of unit, and put forward the comprehensive utilization technology of waste heat of steam turbine. The profit of steam turbine unit will be maximized. The results can provide ideas and schemes for energy-saving retrofit of steam extraction units.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621
本文編號：2292818
[Abstract]:Extraction heating and low vacuum heating are the main ways of heat and power cogeneration centralized heating, and the new technology of circulating water quality improvement based on absorption heat pump has the potential to further improve the heat efficiency and heating capacity of the unit. The engineering practice shows that reducing the loss of cold source is the most effective method to improve the efficiency of steam turbine unit. In this paper, taking the 200MW pumping unit of CNEC Mendong Energy Tongliao General Power Plant as an example, a combined steam turbine heat and power supply process based on absorption heat pump is proposed. Firstly, the circulating process of libr absorption heat pump is simulated by Matlab, and the influence of driving heat source temperature and other parameters on thermal process is analyzed. Based on the design parameters of the unit, the rated and maximum operating conditions are analyzed. The two schemes of constant heating load and power invariant are determined. The performance indexes of cogeneration units in heating period of extraction steam heating and circulating water absorption heat pump are compared and analyzed. The calculation shows that when the heat supply coefficient of the heat pump unit reaches 1.65, under the condition of rated working condition of the constant power generation scheme, The heat efficiency of circulating water absorption heat pump is 77.7%, the heating load is 83.47 MW, which is 22.43% and 31.3MW higher than that of extraction heating, respectively, and the heating capacity is increased by 60%. Finally, aiming at the problem that the waste heat of the steam is not recovered in the non-heat supply period, a comprehensive utilization system of the waste heat of the spent steam is put forward to improve the utilization ratio of the spent steam resource of the steam turbine. Lithium bromide absorption heat pump unit can be used to extract the condenser circulating cooling water by low heating and condensate. According to the actual situation and economy of the unit, the scheme of "No. 1 low adding steam extraction as driving heat source to heat 1 low additive condensate water" and "No. 3 low add steam extraction steam as driving heat source to heat secondary low adding condensate water" is selected. The former can reduce coal consumption by 0.21g / kWhand the latter by 0.25g / kWh. the total coal consumption can be reduced by 0.46g / kWh. The research results show that the waste heat of low grade circulating water can be extracted and utilized by circulating water absorption heat pump, which can reduce the loss of unit cold source, improve the heat efficiency and heat supply load of unit, and put forward the comprehensive utilization technology of waste heat of steam turbine. The profit of steam turbine unit will be maximized. The results can provide ideas and schemes for energy-saving retrofit of steam extraction units.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM621
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，本文編號：2292818
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