【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(jìn)一步提高機(jī)組熱效率和供熱能力的潛力。工程實(shí)踐表明，降低冷源損失是提高汽輪機(jī)組效率最有效的方法。 以唐山開灤熱電公司（簡(jiǎn)稱林電）25MW抽汽機(jī)組為例，提出了基于吸收式熱泵的汽輪機(jī)乏汽熱電冷聯(lián)供工藝。首先應(yīng)用Matlab對(duì)溴化鋰吸收式熱泵的循環(huán)過程進(jìn)行模擬，分析了驅(qū)動(dòng)熱源溫度等參數(shù)對(duì)熱力過程的影響規(guī)律，并以機(jī)組設(shè)計(jì)參數(shù)為基礎(chǔ)，針對(duì)額定工況，確定了供熱負(fù)荷不變和發(fā)電功率不變兩種方案，針對(duì)最大工況，確定了供熱負(fù)荷不變和余熱全回收兩種方案，對(duì)抽汽供熱與循環(huán)水吸收式熱泵供熱的聯(lián)產(chǎn)機(jī)組性能指標(biāo)進(jìn)行了對(duì)比分析。計(jì)算表明：熱泵機(jī)組供熱系數(shù)達(dá)1.65時(shí)，在方案Ⅱ額定工況條件下，，循環(huán)水吸收式熱泵供熱機(jī)組熱效率達(dá)到了77.7%，供熱負(fù)荷達(dá)到83.47MW，分別比抽汽供熱提高了22.43個(gè)百分點(diǎn)和31.3MW，供熱能力提高了60%。而方案Ⅱ的最大工況，供熱負(fù)荷達(dá)到104.41MW，發(fā)電功率也提高到31.04MW。最后，針對(duì)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（冷）定電，提高汽輪機(jī)乏汽資源利用率。 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(jī)組冷源損失，提高了機(jī)組熱效率和供熱負(fù)荷，而提出的汽輪機(jī)乏汽余熱綜合利用工藝，將實(shí)現(xiàn)汽輪機(jī)組收益最大化。研究結(jié)果可為抽汽機(jī)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. Taking the 25MW pumping unit of Tangshan Kailuan Heat and Power Company as an example, a steam turbine combined heat, electricity and cooling 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. The two schemes of constant heating load and invariable generation power are determined. For the maximum working condition, the two schemes of heat supply load invariance and total recovery of residual heat are determined. The performance indexes of combined generation units for extraction heat supply and circulating water absorption heat pump are compared and analyzed. The calculation shows that when the heat supply coefficient of heat pump unit reaches 1.65, under the condition of rated working condition of scheme 鈪

本文編號(hào)：2149699