Waste heat recovery expert teaches you the algorithm of recycling water waste heat recovery income
Waste heat recovery expert Shanghai Qihuang Energy Conservation and Environmental Protection Equipment Co., Ltd. teaches you the algorithm of recycling water waste heat recovery benefits
Regardless of whether the heat supply is expanded or not, the heat pump will have the effect of squeezing and extracting steam, that is, a part of the steam will be squeezed into the steam turbine for work or power generation, and this part of the revenue is clearly determined. Secondly, if the heat supply is actually increased due to the input of the heat pump, this part of the increased heat supply due to the input of the heat pump will also generate revenue for the power plant. Third, after the heat pump is put into operation, if the heat supply of the power plant exceeds the original maximum heat supply for a certain period of time, the excess heat supply can be converted into fuel cost to calculate the income.
As long as the heat supply does not exceed the maximum heating capacity of the power plant, the result of adding the heat pump must be to squeeze part of the heat extraction steam back into the steam turbine to do work, and the real gains obtained by the power plant should be calculated according to the squeeze steam extraction method. The reason is very simple. In the case where the heat supply does not exceed the heating capacity of the power plant, even if the heat pump is not used, the power plant can supply heat normally, except that the steam extraction is used. After adding the heat pump, only part of the extraction steam is used, and the power plant can only get the capacity contained in this part of extraction.
Calculate revenue based on fuel. People who hold this view believe that after the heat pump is added to the power plant, its heat supply will increase and the increased heat supply is the heat absorbed by the heat pump, and the profit gained by the power plant is the heat absorbed by the heat pump converted into fuel costs. Of course, some losses associated with the heat pump were also tested. The problem here is that for power plants, the heat absorbed by the heat pump cannot be simply converted into fuel costs. Explain in detail below.
In order to simplify the problem, we make some waste heat recovery assumptions. First, after the heat pump is put in, there will be no additional losses to the power plant, whether it is the loss caused by the increase in the turbine back pressure or the increase in the power consumption of the heat network circulation pump due to the increase in pipeline resistance. Second, the heat pump itself does not consume any form of energy, its role is simply to absorb the residual heat in the circulating water into the heating system.
The role of the heat pump after it is put into operation can be described as follows: when the heat pump is put in, some “white” heat will enter the heat grid system, and under the condition of constant heat supply, the heat extraction steam will be reduced accordingly. Of course, this part of steam extraction will return to the steam turbine to do work or generate electricity. Since the power generation of the power plant is determined by the power grid, we further assume that when the heat extraction steam is pushed into the steam turbine for work, it is necessary to ensure that the power generation of the steam turbine unit remains unchanged. To this end, only the main steam intake is reduced. Obviously, the reduced main steam, or the electricity generated by this part of the main steam saved, should be equal to the electricity generated by the heat extraction steam that is pushed into the steam turbine. After adding the heat pump, the power plant's income is that this part is recovered by the remaining steam waste heat, specifically, the fuel consumed by heating this part of the main steam. This shows that it is obviously not reasonable to directly convert the heat absorbed by the heat pump into fuel cost and use it as the income of the power plant.
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