Novel high-back pressure cogeneration system

Abstract

The invention discloses a novel high-back pressure cogeneration system. The novel high-back pressure cogeneration system comprises a power generating system and a heat supply system, wherein the power generating system comprises a boiler, a high-pressure cylinder, a first intermediate-pressure cylinder, a low-pressure cylinder, a second intermediate-pressure cylinder, a condenser, a deaerator, a water pump and a heater, and the heat supply system comprises a heater for a heating network, a remote heating network and a near heating network. The first intermediate-pressure cylinder and the second intermediate-pressure cylinder are arranged, so as to respectively supply energy to a heating network circulating system, the novel high-back pressure cogeneration system is controlled by virtue of control valves and is applied to a heat supply mode of a high-capacity machine unit, the energy is saved, and the heat supply efficiency is high; a filter device, a third control valve, a fourth control valve and a temperature sensor are arranged, circulating hot water of the condenser or outlet hot water of the remote heating network can be selected by virtue of the control valves when heat is supplied by the near heating network, the circulating hot water of the condenser is heated by the heater for the heating network when heat is supplied by the remote heating network, and exhaust heat of the condenser and waste heat of the remote heating network are fully used, so that the novel high-back pressure cogeneration system has the advantages of high heat utilization rate and good economy and is favorable for energy conservation and emission reduction.

Description

Technical field: [0001] The invention belongs to the technical field of thermoelectricity, and in particular relates to a novel high back pressure cogeneration system of heat and electricity. Background technique: [0002] Combined heat and power technology is an important way to cleanly and efficiently utilize coal and realize energy saving and emission reduction for thermal power units. The energy utilization efficiency of advanced coal-fired units using combined heat and power can reach about 80%, which is comparable to that of existing supercritical units of 310g / kWh ( Power supply efficiency 39%) compared with power supply coal consumption, heat efficiency nearly doubles. At the same time, the combined heat and power unit reduces the loss of cold sources and greatly reduces the environmental pollution caused by burning fossil energy for direct heating. In the Five-Year Plan for Energy Conservation and Emission Reduction issued by the State Council during the "Eleventh ...

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Problems solved by technology

[0004] For this reason, the technical problem to be solved by the present invention is that the heat supply mode of the large-capacity unit on the side of the power generation system in the prior art cogeneration system has low heat supply efficiency, waste of energy, and greatly reduced economic efficiency, which is not conducive to energy saving and emission reduction. The heating demand on the side of the thermal system is complex, which is unfavorable for the utilization of waste heat from the exhaust steam of the high back pressure steam turbine, so a new high back pressure combined heat and power system is proposed

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