1000mw ultra supercritical double reheat boiler with high reheat steam temperature and wide adjustment ratio

Abstract

The invention provides a 1000MW ultra-supercritical secondary reheat boiler with a high reheat steam temperature and width regulation ratio. The 1000MW ultra-supercritical secondary reheat boiler comprises a boiler body, a primary reheat low-temperature reheater, primary reheat wall type reheaters, a primary reheat high-temperature reheater, a secondary reheat low-temperature reheater, secondary reheat wall type reheaters and a secondary reheat high-temperature reheater, wherein the primary reheat low-temperature reheater, the primary reheat wall type reheaters and the primary reheat high-temperature reheater are sequentially connected, and the secondary reheat low-temperature reheater, the secondary reheat wall type reheaters and the secondary reheat high-temperature reheater are sequentially connected. The boiler body comprises a hearth and an outlet flue. The primary reheat wall type reheaters are symmetrically arranged on a front wall and a rear wall of a vertical water cooling wall section in the hearth. The secondary reheat wall type reheaters are symmetrically arranged on a left wall and a right wall of the vertical water cooling wall section in the hearth. The boiler is simple in structure and low in cost; the reheat steam temperature is greatly improved; the outlet exhaust temperature of an air pre-heater is reduced; exhaust heat losses are reduced; and therefore the efficiency of the boiler is improved, power supply coal consumption is reduced, and the economic efficiency and safety of running of a unit are guaranteed.

Description

technical field [0001] The invention belongs to the field of electric equipment, in particular to a 1000MW ultra-supercritical secondary reheating boiler with high reheating steam temperature and wide adjustment ratio. Background technique [0002] With the increasing scarcity of fossil energy and the gradual enhancement of people's awareness of environmental protection, the work of energy conservation and emission reduction has been raised to the national political level. Power generation, as a traditional high energy consumption and high pollution industry, is naturally valued by the state. Generating units with large capacity, high parameters, and low energy consumption have gradually become the mainstream; The problem of low hot steam temperature, and the problem of low reheat steam temperature is common in the existing double reheat unit boilers that have been put into operation. The 1000MW ultra-supercritical double reheat unit is currently the most advanced generatin...

AI Technical Summary

Problems solved by technology

According to the steam temperature adjustment method of the double reheat unit boiler that has been put into operation, the double reheat unit boiler (Guodian Taizhou) designed and manufactured by Shanghai Boiler Factory adopts means such as burner swing angle, upper grinding operation, and reduction of soot blowing in the furnace. It is mainly used to increase the flue gas temperature at the furnace outlet; since the burner swings up, there is a greater risk of combustion deterioration

The double reheat unit boiler (Huaneng Laiwu) designed and manufactured by Harbin Boiler Factory is designed with a flue gas recirculation system, which increases the flue gas enthalpy at the furnace outlet by increasing the flue gas volume at the furnace outlet; The ash melting point temperature of coal cannot be raised to meet the requirements of secondary reheating due to the problem of slagging on the heating surface; the method of flue gas recirculation increases the enthalpy of flue gas at the furnace outlet, which is limited by the combustion stability in the furnace and the amount of flue gas recirculation Too large will affect the combustion stability in the furnace, especially when the low-temperature flue gas from the outlet of the induced draft fan is used; at the same time, the flue gas recirculation will increase the investment cost and operating cost

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