Desuperheating water system applied to high and low pressure bypass combined heating

Abstract

The invention discloses a desuperheating water system applied to high and low pressure bypass combined heating. The desuperheating water system comprises a boiler, a high pressure cylinder, an intermediate pressure cylinder, a low pressure cylinder, a heat grid heater and a deaerator. A part of live steam of a superheater outlet of the boiler enters the high pressure cylinder for work, and a partof the live steam enters a high pressure bypass pressure and temperature reducing valve set. The steam discharged from the high pressure cylinder and the steam of an outlet of the high pressure bypasstemperature and pressure reducing valve set are converged and then enter a reheater of the boiler to absorb heat again. In a pipeline system of a heating-steam extraction-heating supply header, because the specific volume increases rapidly after decompression by heat and steam, in order to promote the effect of atomization temperature reduction and avoid potential safety hazards caused by water attacks caused by water in steam, a two-stage temperature reduction device is arranged, a first-stage desuperheater enters first after decompression by heat and steam, the desuperheating water is takenfrom an outlet of the last stage high pressure heater, a second-stage desuperheater then enters, the desuperheating water is taken from an outlet of a heat grid drain pump, and the effect of temperature reduction and the safe reliability of pipeline operation are improved.

Description

【Technical field】 [0001] The invention belongs to the technical field of cogeneration of heat and power, and relates to a desuperheating water system applied to high and low side combined heat supply. 【Background technique】 [0002] At present, the demand for electricity in the heating season in the northern region is low and the demand for heat load is large. Coupled with the rapid development of wind and solar power, coal-fired cogeneration units are required to further carry out thermoelectric decoupling technology transformation to further increase the heating capacity while reducing the electrical load. The essence of weakening the strong coupling relationship between electricity and heat of the current heating unit is to improve the heat supply capacity of the unit at low and medium loads. Among the main technical routes, the high and low pressure bypass combined heating technology reduces the temperature and pressure of part of the boiler’s new steam to the cold main ...

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Problems solved by technology

[0003] The desuperheating water configuration scheme of the existing high and low pressure bypass combined heating system refers to the main steam desuperheating water system of the boiler, and water is directly taken from the outlet of the boiler feed water pump, and used as the main steam desuperheating water of the high pressure bypass and the heat re-extraction of the low pressure bypass Desuperheating water, did not dig out the influence of desuperheating water source on the overall economics of the unit

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