System for recovering waste heat and water from exhaust gas step by step and operation method
A cascading recovery and operation method technology, which is applied in chemical instruments and methods, combustion methods, gaseous effluent wastewater treatment, etc., can solve the problems of large footprint, complex system, poor operation safety and stability, etc., and achieve energy-saving effects. The system is stable and reliable, and the effect of reducing cost input
Pending Publication Date: 2020-07-24
DATANG ENVIRONMENT IND GRP
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Problems solved by technology
[0003] The existing flue gas dehydration process mainly adopts the method of partition wall cooling, the system is complicated, the floor area is large, and the operation safety and stability are poor
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[0040] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0041] In describing the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Straight", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", etc. or The positional relationship is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather t...
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The invention provides a system for recovering waste heat and water from exhaust gas step by step and an operation method thereof. The system comprises a boiler, a steam turbine and a cooling and regenerative device of the steam turbine which are sequentially connected, and the steam turbine extracts steam from the boiler and enters the cooling and regenerative device of the steam turbine througha pipeline to heat condensate and supply water for the boiler; a steam extraction port of the steam turbine is connected with an inlet of a generator, and a water outlet of the generator is connectedwith the cooling and regenerative device of the steam turbine; a steam outlet of the generator is connected with a condenser; the generator is sequentially connected with at least one stage of an absorber, a pressure exchanger, a booster pump and a reverse osmosis device, the reverse osmosis device is connected back to the generator, and the generator and the absorber contain a concentrated salt solution which can be recycled along the system; and a flue gas port of the boiler is sequentially connected with a dust remover and a desulfurization tower, and a flue gas outlet of the desulfurization tower is connected with the absorber. According to the operation method, the absorption of the high-concentration solution is utilized to achieve the recovery of the water heat and water from the boiler exhaust gas, and the effects of energy saving and water saving are remarkable.
Description
technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a system and an operation method for cascadingly recovering exhaust heat and water. Background technique [0002] Reducing the fuel consumption of coal-fired power plants, reducing pollutant emissions, and reducing water consumption in power plants are key technical problems in thermal power plants. With the development of technology, low-pressure economizers are widely used in the waste heat recovery of boiler exhaust, and the waste heat recovery of power station boiler exhaust can improve the efficiency of coal-fired power plants. The treatment of boiler exhaust can reduce the pollutant emission level of coal-fired power plants. The tails of modern coal-fired power plant boilers are equipped with dust collectors to remove solid pollutants in the flue gas, and desulfurization towers are arranged to remove sulfur dioxide in the boilers. The modern desu...
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IPC IPC(8): F23J15/06F23J15/02F23J15/04F23L15/00C02F1/44C02F103/18
CPCF23J15/06F23J15/022F23J15/04F23L15/00C02F1/441C02F2103/18Y02E20/34
Inventor 文钰李大龙张钧泰张国柱李本锋
Owner DATANG ENVIRONMENT IND GRP