CN203571707U

CN203571707U - Waste heat utilization device for deep cooling of waste flue gas of boiler

Info

Publication number: CN203571707U
Application number: CN201320602474.4U
Authority: CN
Inventors: 李军; 刘士宏; 张春雷; 李爽; 王立秋
Original assignee: Datang Shuangyashan Thermal Power Co Ltd
Current assignee: Datang Shuangyashan Thermal Power Co Ltd
Priority date: 2013-09-28
Filing date: 2013-09-28
Publication date: 2014-04-30
Anticipated expiration: 2023-09-28

Abstract

Provided is a waste heat utilization device for deep cooling of waste flue gas of a boiler. The waste heat utilization device for deep cooling of the waste flue gas of the boiler comprises a separated heat pipe exchanger, a primary closed circulating network, a secondary heat exchanger and a secondary circulating network, wherein the separated heat pipe exchanger is fixedly arranged in a horizontal flue arranged between a draught fan and a chimney of the boiler, the primary closed circulating network is composed of a primary circulating pump, a pressure-stable water pump, a primary water supplementing door and a softened water pump, the secondary circulating network comprises a water feed pump and a hot water tank, the water feed pump is connected with a water pipe arranged at one end of the secondary heat exchanger, the other end of the secondary heat exchanger is connected with a water pipe of the hot water tank, and a primary hot water valve, a secondary hot water valve, a hot water adjusting valve and a hot water bypass valve are installed on the water pipe of the hot water tank. The temperature of flue gas, entering an inlet of a desulfurization tower, of the boiler is lowered, the temperature of the flue gas can be close to the optimal reaction temperature of the desulfurization tower, and the desulfurization effect is good; due to the fact that the amount of evaporated slurry is reduced, namely, the amount of supplemented water of the desulfurization tower is reduced, consumption of coal for power generation is reduced, the water saving effect is obvious, and the benefit created by production of hot water through waste heat is obtained.

Description

Boiler residual cigarette deep temperature reduction residual heat using device

Technical field

The utility model relates to boiler energy-saving technology, especially a kind of boiler residual cigarette deep temperature reduction residual heat using device.

Background technology

At present boiler exhaust gas is by the exit flue between boiler induced-draft fan and chimney,, after carrying out desulfurization, desulfurizer could discharge.The exhaust gas temperature of power plant is 136 ℃ of left and right, and the best entrance flue gas temperature of desulfurizer should be 90-100 ℃, the high desulfurizer that causes of entrance flue gas temperature is in optimum Working, causes that slurries evaporation capacity is large, the machinery amount of carrying is large, rate of water make-up large and boiler flue corrosion, the problems such as liquid of wafing simultaneously.For this reason, the cooling of the exhaust gas temperature of power plant is directly connected to the effect of environment protection treating.

Summary of the invention

In order to overcome the difficulty of horizontal flue cooling, flue-gas temperature is too high makes desulfurizer not in the deficiency of optimum Working, the utility model provides a kind of boiler residual cigarette deep temperature reduction residual heat using device, on boiler induced-draft fan outlet horizontal flue, built-in heat exchange of heat pipe is installed, the demineralized water of 1000t/ days can be brought up to 85 ℃ by 30 ℃, horizontal flue flue-gas temperature is reduced to 106 ℃ by 136 ℃ simultaneously, reduced the inlet flue gas temperature of desulfurizing tower, reach the optimal reaction temperature that makes cigarette temperature approach desulfurizing tower, and because of cigarette temperature drop low 30 ℃, evaporation capacity and the machinery amount of carrying of slurries have been reduced, avoid occurring gypsum rain phenomenon.The hot water that smoke waste heat utilization system is heated can carry out moisturizing to large heat supply network, also hot water externally can be sold simultaneously.

The utility model solves the scheme of its technical problem, comprise separate type heat pipe exchanger, a closed cycle net, secondary heat exchanger, secondary cycle net, wherein, separate type heat pipe exchanger is fixed in the horizontal flue between boiler induced-draft fan and chimney, a closed cycle net is by a circulating pump, voltage stabilizing water pump, valve of moisturizing, demineralized water water pump composition, No. one time circulating pump one end is connected with separate type heat pipe exchanger one end water pipe, another end is connected with secondary heat exchanger water pipe, circulating pump and demineralized water pump house are connected with voltage stabilizing water pump and valve of moisturizing, separate type heat pipe exchanger backwater end is communicated with secondary heat exchanger, secondary cycle net comprises feed pump, boiler, feed pump is connected with secondary heat exchanger one end water pipe, secondary heat exchanger another end is connected with boiler water pipe, valve of hot water is installed on water pipe, hot water secondary valve, hot water control valve and hot water bypass valve.

The beneficial effects of the utility model are: reduction boiler smoke enters the inlet flue gas temperature of desulfurizing tower, make cigarette temperature approach the optimal reaction temperature of desulfurizing tower, not only desulfurized effect is good, also because having reduced the evaporation capacity of slurries, namely reduced the rate of water make-up of desulfurizing tower, reduce gross coal consumption rate, water-saving result obviously also obtains waste heat simultaneously and produces the benefit that hot water increases.

Accompanying drawing explanation:

By reference to the accompanying drawings the utility model is further illustrated:

Fig. 1. for the utility model pipe network layout connects front view.

The specific embodiment:

Embodiment of the present utility model comprises separate type heat pipe exchanger, closed cycle net, secondary heat exchanger, secondary cycle net, with reference to Fig. 1.Separate type heat pipe exchanger 2 is fixed in the horizontal flue 1 between boiler induced-draft fan 17 and chimney 3, a closed cycle net 5 is by a circulating pump 4, voltage stabilizing water pump 16, valve 15 of moisturizing, demineralized water water pump 13 forms, No. one time circulating pump 4 one end are connected with separate type heat pipe exchanger 2 one end water pipes, another end is connected with secondary heat exchanger 6 water pipes, water pipe between circulating pump 4 and demineralized water water pump 13 is connected with voltage stabilizing water pump 16 and valve 15 of moisturizing, separate type heat pipe exchanger 2 backwater ends and secondary heat exchanger 6 cross currents, secondary cycle net 10 comprises feed pump 12, boiler 11, feed pump 12 is connected with secondary heat exchanger 6 one end water pipes, secondary heat exchanger 6 another ends are connected with boiler 11 water pipes, valve 7 of hot water is installed on water pipe, hot water secondary valve 9, hot water control valve 8 and hot water bypass valve 14.

Claims

1. a boiler residual cigarette deep temperature reduction residual heat using device, comprise separate type heat pipe exchanger, a closed cycle net, secondary heat exchanger, secondary cycle net, it is characterized in that: separate type heat pipe exchanger is fixed in the horizontal flue between boiler induced-draft fan and chimney, a closed cycle net is by a circulating pump, voltage stabilizing water pump, valve of moisturizing, demineralized water water pump composition, No. one time circulating pump one end is connected with separate type heat pipe exchanger one end water pipe, another end is connected with secondary heat exchanger water pipe, circulating pump and demineralized water pump house are connected with voltage stabilizing water pump and valve of moisturizing, separate type heat pipe exchanger backwater end is communicated with secondary heat exchanger, secondary cycle net comprises feed pump, boiler, feed pump is connected with secondary heat exchanger one end water pipe, secondary heat exchanger another end is connected with boiler water pipe, valve of hot water is installed on water pipe, hot water secondary valve, hot water control valve and hot water bypass valve.