吸收式热泵与热电联产耦合供热系统研究
发布时间：2018-08-02 07:35
【摘要】：节能降耗是现代工业发展的永恒主题,火电厂在整个社会节能减排的过程中发挥着举足轻重的作用。电厂循环冷却水中蕴含大量的低温热能,若不加以利用,则白白损失到大气中。利用吸收式热泵回收循环水余热供暖,既能节约能源,又能扩增电厂的供暖能力。本文提出当某地区供热负荷需要扩增时,采用吸收式热泵与热电联产耦合供热这一新型方式进行供热,并与热泵与热电联产单独供热和热网加热器供热方式进行对比。该方案通过耦合控制器调节热网水量和热泵、热网加热器的抽汽量,从而使得热量在热泵和热网加热器之间进行重新分配,达到优先利用热泵供热的目的,热网加热器作为补充供热方式。该方案可以使电厂回收更多的循环水热量,冷源损失得到进一步降低,并且实现热泵在几乎整个供暖期的满负荷运行。在不考虑背压变化和热泵变工况的条件下,分析随着室外温度的变化,热负荷变化对供热系统的影响,并对整个系统的经济性进行计算和分析。提出等效热化发电比的概念和计算方法,从而更加清晰的体现出热泵供热的优势。从企业利益角度出发,分析热电总收益在整个供暖期和供暖面积范围内的变化,将热电厂盈亏状况清晰的呈现出来,指明耦合方案的特点,与其他两种供热方案进行对比。最后以某300MW抽凝供热机组为例,进行耦合供热方案改造,并分析机组的经济性和热电总收益,研究表明,此改造方案技术可行,经济效益明显,投资回收期较短。
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU833.1
[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.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU833.1
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