Abstract
China aims to peak carbon emissions by 2030. As a result, small-scale coal-fired combined heat and power (CHP) units and self-provided units are gradually shut down, and large-scale coal-fired CHP units are a solution to undertake the industrial heat loads. From the perspective of the industrial heat load allocation during the non-heating season, the problems regarding the coal-saving scheduling strategy of coal-fired CHP units are addressed. The steam-water equations of CHP units are established to analyze the heat-power coupling characteristics. The energy utilization efficiency, exergy efficiency and the coal consumption are analyzed. The optimization model of saving coal consumption is established and the adaptive mutation particle swarm optimization (AMPSO) is introduced to solve the above model. The 330 MW coal-fired CHP unit is taken as an example, and the results show that for the constant main flow rate, each increase of 1 t/h industrial steam extraction will reduce the power output by about 0.321 MW. The energy utilization efficiency and the exergy are mainly influenced by industrial steam supply and the power load, respectively. For the CHP system with two parallel CHP units, the unequal allocation of industrial heat load between two units saves more coal than equal allocation. The coal consumption can be reduced when the unit with lower power load undertakes more industrial heat load. In the typical day, the total coal consumption after optimization is 3203.92 tons, a decrease of 14.66 tons compared to the optimization before. The two CHP units in the case can benefit about 5,612,700 CHY extra in one year.
Highlights
Published: 26 December 2021In order to achieve “peaking carbon” by 2030 and “carbon neutral” by 2060, China has been promoting the elimination of backward production capacity and reduction of coal consumption
When the combined heat and power (CHP) unit operates at 60%
For the constant main flow rate, each 1 t/h industrial extraction provided by the case CHP unit reduces the power output by about 0.321 MW
Summary
Published: 26 December 2021In order to achieve “peaking carbon” by 2030 and “carbon neutral” by 2060, China has been promoting the elimination of backward production capacity and reduction of coal consumption. Small-scale coal-fired combined heat and power (CHP) units supplying steam for enterprise production and civil heating are gradually being shut down, and large-scale coal-fired CHP units supplying steam centrally can be considered as an effective measure to achieve carbon emission reduction targets [1]. The practical demand for steam in the production chain and the reality of shutting down small-scale coal-fired CHP units provide a market for large-scale coal-fired. CHP units to provide an integrated energy supply. The CHP unit can be renovated to extract some steam for industrial production while generating power. The profit of the CHP unit can be increased by selling steam to the users. The investment in equipment of the industrial heat users can be saved partly. It can contribute to a certain extent to the reduction of regional carbon emissions
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