發(fā)布時間：2018-08-02 07:35

【摘要】：節(jié)能降耗是現(xiàn)代工業(yè)發(fā)展的永恒主題,火電廠在整個社會節(jié)能減排的過程中發(fā)揮著舉足輕重的作用。電廠循環(huán)冷卻水中蘊(yùn)含大量的低溫?zé)崮?若不加以利用,則白白損失到大氣中。利用吸收式熱泵回收循環(huán)水余熱供暖,既能節(jié)約能源,又能擴(kuò)增電廠的供暖能力。本文提出當(dāng)某地區(qū)供熱負(fù)荷需要擴(kuò)增時,采用吸收式熱泵與熱電聯(lián)產(chǎn)耦合供熱這一新型方式進(jìn)行供熱,并與熱泵與熱電聯(lián)產(chǎn)單獨(dú)供熱和熱網(wǎng)加熱器供熱方式進(jìn)行對比。該方案通過耦合控制器調(diào)節(jié)熱網(wǎng)水量和熱泵、熱網(wǎng)加熱器的抽汽量,從而使得熱量在熱泵和熱網(wǎng)加熱器之間進(jìn)行重新分配,達(dá)到優(yōu)先利用熱泵供熱的目的,熱網(wǎng)加熱器作為補(bǔ)充供熱方式。該方案可以使電廠回收更多的循環(huán)水熱量,冷源損失得到進(jìn)一步降低,并且實(shí)現(xiàn)熱泵在幾乎整個供暖期的滿負(fù)荷運(yùn)行。在不考慮背壓變化和熱泵變工況的條件下,分析隨著室外溫度的變化,熱負(fù)荷變化對供熱系統(tǒng)的影響,并對整個系統(tǒng)的經(jīng)濟(jì)性進(jìn)行計算和分析。提出等效熱化發(fā)電比的概念和計算方法,從而更加清晰的體現(xiàn)出熱泵供熱的優(yōu)勢。從企業(yè)利益角度出發(fā),分析熱電總收益在整個供暖期和供暖面積范圍內(nèi)的變化,將熱電廠盈虧狀況清晰的呈現(xiàn)出來,指明耦合方案的特點(diǎn),與其他兩種供熱方案進(jìn)行對比。最后以某300MW抽凝供熱機(jī)組為例,進(jìn)行耦合供熱方案改造,并分析機(jī)組的經(jīng)濟(jì)性和熱電總收益,研究表明,此改造方案技術(shù)可行,經(jīng)濟(jì)效益明顯,投資回收期較短。
[Abstract]:Energy saving and consumption reduction is the eternal theme of modern industrial development, and thermal power plants play an important role in the process of energy saving and emission reduction in the whole society. The circulating cooling water of power plant contains a lot of low temperature heat energy, if it is not utilized, it will be lost to the atmosphere. Using absorption heat pump to recover the waste heat of circulating water can save energy and expand the heating capacity of power plant. In this paper, when the heating load in a certain area needs to be expanded, a new type of heat supply is proposed, which is the absorption heat pump coupled with the cogeneration of heat and electricity, and compared with the heat pump and the cogeneration of heat and electricity separately and the heating network heater. In this scheme, the heat network water and heat pump are adjusted by coupling controller, so that the heat can be redistributed between the heat pump and the heat net heater, and the heat supply can be preferentially used. Heating network heater as a supplementary heating mode. This scheme can make the power plant recover more circulating water heat, further reduce the loss of the cold source, and realize the full load operation of the heat pump in almost the whole heating period. Under the condition of not considering the change of backpressure and heat pump, the influence of the change of outdoor temperature and heat load on the heating system is analyzed, and the economy of the whole system is calculated and analyzed. This paper puts forward the concept and calculation method of equivalent thermal power generation ratio, which shows the advantages of heat pump heating more clearly. From the angle of enterprise benefit, this paper analyzes the change of the total income of thermal power in the whole heating period and the heating area, presents the profit and loss situation of the thermal power plant clearly, points out the characteristics of the coupling scheme, and compares it with the other two heating schemes. Finally, taking a 300MW condensing heating unit as an example, the coupling heating scheme is reformed, and the economy of the unit and the total income of heat and power are analyzed. The research shows that the retrofit scheme is feasible, economic benefit is obvious, and the investment recovery period is short.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU833.1

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本文編號：2158662