CN202056856U - System for recycling afterheat of flue gas through high-temperature coal economizer - Google Patents

System for recycling afterheat of flue gas through high-temperature coal economizer Download PDF

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Publication number
CN202056856U
CN202056856U CN2011200834096U CN201120083409U CN202056856U CN 202056856 U CN202056856 U CN 202056856U CN 2011200834096 U CN2011200834096 U CN 2011200834096U CN 201120083409 U CN201120083409 U CN 201120083409U CN 202056856 U CN202056856 U CN 202056856U
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China
Prior art keywords
temperature
flue gas
economizer
boiler
coal economizer
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Expired - Fee Related
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CN2011200834096U
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Chinese (zh)
Inventor
李钧
李雪
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North China Electric Power University
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North China Electric Power University
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Priority to CN2011200834096U priority Critical patent/CN202056856U/en
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Anticipated expiration legal-status Critical
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Abstract

The utility model belongs to the technical field of energy saving of boiler and brown coal drying, and particularly to a system for recycling afterheat of flue gas through a high-temperature coal economizer. A flue gas outlet of the coal economizer is divided into two paths: one path is communicated with an air preheater, and the other pass enters the high-temperature coal economizer through a bypass flue channel. The high-temperature flue gas heats working medium in the high-temperature coal economizer. The recycled afterheat of the flue gas can be used for the following purposes: reheating the heater in a steam turbine, operating on an air warmer of a boiler, supplying heat in a thermal network, performing seawater desalination, etc. After an outlet pipe of the high-temperature coal economizer is communicated with an outlet pipe of the air preheater, the combined pipe is communicated with an inlet of a static deduster. The system utilizes partial high-temperature flue gas before the air preheater of the boiler, and the high-temperature coal economizer is used for recycling and utilizing afterheat of partial high-temperature flue gas of the boiler according to the technique, thereby reducing the temperature of the exhausted smoke, reducing loss of the exhausted smoke and realizing energy saving and emission reduction of a boiler set.

Description

A kind of system that utilizes high-temperature economizer to reclaim fume afterheat
Technical field
The utility model belongs to boiler energy-saving and brown coal drying technical field, is specifically related to a kind of system that utilizes high-temperature economizer to reclaim fume afterheat.
Background technology
At present, the energy-saving and emission-reduction of large electric power plant unit are the present important state basic policies of country.Exhaust Gas Heat Loss for Utility Boiler is one of main heat loss of generating set.Exploitation flue gas in power station boiler UTILIZATION OF VESIDUAL HEAT IN technology to reducing exhaust gas temperature, reduces the unit heat loss, improves the unit operation economy, reduces the discharging of pollutants such as carbon dioxide, nitrogen oxide, oxysulfide, and the important engineering practical value is arranged.
It is to utilize the flue gas waste heat recovery apparatus that is arranged on the boiler back end ductwork that fume afterheat utilizes the principle of technology, reclaim fume afterheat and be applied to boiler side, steam turbine side or other system, reduce exhaust gas temperature, reduce boiler heat loss, improve thermal power generation unit performance driving economy, reach the energy-saving and emission-reduction purpose.
Consider the restriction of boiler milling system to hot blast temperature, need mix cold wind at the pulverized coal preparation system inlet and keep wind-warm syndrome of coal pulverizer outlet, it is restricted to cause air preheater to absorb flue gas heat, the present situation that exhaust gas temperature is higher adopts the partial fume waste heat before high-temperature economizer utilizes air preheater.
Summary of the invention
The utility model provides a kind of system that utilizes high-temperature economizer to reclaim fume afterheat for reducing Exhaust Gas Heat Loss for Utility Boiler.
The technical solution adopted in the utility model is as follows:
The economizer exhanst gas outlet is divided into two-way: the one road inserts air preheater, and another road enters high-temperature economizer, the recovery section fume afterheat through the bypass flue; The export pipeline of high-temperature economizer is communicated with the inlet that electrostatic precipitator is inserted in the back with the export pipeline of air preheater.
Between described economizer exit and the high-temperature economizer inlet bypass shutoff valve is set, is used for the brown coal drying system sectionalizing.
On the pipeline between described high-temperature economizer outlet and the electrostatic precipitator bypass valve door is set, is used to adjust exhaust gas volumn by the brown coal drying cylinder.
The beneficial effects of the utility model are:
(1) the fume afterheat quality height of high-temperature economizer recovery: before high-temperature economizer is arranged in air preheater, the input gas temperature height, high-temperature economizer sender property outlet temperature is higher than conventional low-pressure low-temperature economizer, can access high-grade waste heat, has expanded the approach of UTILIZATION OF VESIDUAL HEAT IN.For example UTILIZATION OF VESIDUAL HEAT IN is when heat regenerative system, can the higher condensate water of heating-up temperature; When being used to heat hot net water, can increase bigger area of heat-supply service.Particularly for the unit that adopts air cooling technique, if adopt conventional low-pressure low-temperature economizer, because condensing water temperature is higher, flue gas waste heat recovery equipment heat transfer temperature and pressure are less, and the low-pressure coal saver heat exchange area is bigger.If the employing high-temperature economizer just can improve the heat transfer temperature and pressure, reduce heat exchange area.
(2) adopt high-temperature economizer can reduce the newly-increased flow resistance of fume side: the flue gas of the high-temperature economizer of flowing through derives from the bypath system of the preceding flue of air preheater, this partial fume does not pass through air preheater, the resistance partial offset that the resistance that the high-temperature economizer of flowing through increases and the air preheater of not flowing through reduce, reduce the blower fan power consumption, make fume afterheat utilize the economic benefit of technology more obvious.
(3) heat transfer temperature and pressure height in the high-temperature economizer: flue gas derives from the preceding bypass of air preheater in the high-temperature economizer, and its input gas temperature (about 380~400 ℃) is far longer than the preceding flue-gas temperature (about 120~150 ℃) of conventional desulphurization system booster fan.The heat exchange area that bigger heat transfer temperature and pressure are corresponding less can make the economizer compact conformation, reduces investment outlay and makes things convenient for layout.
(4) the high-temperature economizer cost of investment is low: the high-temperature economizer entrance flue gas temperature is far above acid dew point, when boiler uses sulphur coal, can not consider the heating surface cold end corrosion with, the heating surface material can be carbon steel, the cost of reducing investment outlay.
(5) high-temperature economizer adopts the extended surface optimal design, improves heat exchange efficiency, effectively reduces wearing and tearing and dust stratification.Economizer adopts extended surface augmentation of heat transfers such as extended surface tube, spiral-finned tube, H type extended surface tube, and optimizes the design of flue gas flow passage component, chooses rational flue gas flow rate, effectively prevents wearing and tearing.Need the installing soot blower in the high-temperature economizer.
Description of drawings
Fig. 1 is a system schematic of the present invention.
The 1-economizer; The 2-air preheater; The 3-high-temperature economizer; 4-bypass valve door; 5-bypass shutoff valve; The 6-electrostatic precipitator; The 7-air-introduced machine; The 8-booster fan; The 9-desulfurizing tower; The 10-chimney.
The specific embodiment
The utility model provides a kind of system that utilizes high-temperature economizer to reclaim fume afterheat, below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described.
As shown in Figure 1, the high-temperature flue gas part of economizer 1 outlet enters air preheater 2, another part enters high-temperature economizer 3 through the bypass flue, and working medium can be used for purposes such as steam turbine bleeder heater, boiler steam air heater, heat supply network heat supply, desalinization after absorbing flue gas heat in the high-temperature economizer.The flue gas of high-temperature economizer 3 outlet mixes the laggard electrostatic precipitator 6 of going into the flue gas that air preheater 2 exports, enter chimney 10 by air-introduced machine 7, booster fan 8, desulfurizing tower 9 then.Between economizer 1 outlet and high-temperature economizer 3 inlets, bypass shutoff valve 5 is set, is used for the high-temperature economizer off-the-line.On the pipeline between high-temperature economizer 3 outlets and the electrostatic precipitator 6, bypass valve door 4 is set, is used to adjust exhaust gas volumn by high-temperature economizer.Can be under the prerequisite that does not influence boiler operatiopn, high-temperature economizer is stopped transport and operation such as maintenance.

Claims (3)

1. system that utilizes high-temperature economizer to reclaim fume afterheat, it is characterized in that the economizer exhanst gas outlet is divided into two-way: the one road inserts air preheater, and another road enters high-temperature economizer through bypass flue; The export pipeline of high-temperature economizer is communicated with the inlet that electrostatic precipitator is inserted in the back with the export pipeline of air preheater.
2. a kind of system that utilizes high-temperature economizer to reclaim fume afterheat according to claim 1 is characterized in that, between described economizer exit and the high-temperature economizer inlet bypass shutoff valve is set.
3. a kind of system that utilizes high-temperature economizer to reclaim fume afterheat according to claim 1 is characterized in that, on the pipeline between described high-temperature economizer outlet and the electrostatic precipitator bypass valve door is set.
CN2011200834096U 2011-03-25 2011-03-25 System for recycling afterheat of flue gas through high-temperature coal economizer Expired - Fee Related CN202056856U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2011200834096U CN202056856U (en) 2011-03-25 2011-03-25 System for recycling afterheat of flue gas through high-temperature coal economizer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011200834096U CN202056856U (en) 2011-03-25 2011-03-25 System for recycling afterheat of flue gas through high-temperature coal economizer

Publications (1)

Publication Number Publication Date
CN202056856U true CN202056856U (en) 2011-11-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705809A (en) * 2012-06-15 2012-10-03 黄绍新 Thermal power unit with smoke feed water heater
CN102705810A (en) * 2012-06-15 2012-10-03 黄绍新 Device for boiler flue gas waste heat utilization in thermal power unit
CN103438427A (en) * 2013-08-09 2013-12-11 天津诺能达能源科技有限公司 Gas-fired boiler afterheat recovering system and recovering method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102705809A (en) * 2012-06-15 2012-10-03 黄绍新 Thermal power unit with smoke feed water heater
CN102705810A (en) * 2012-06-15 2012-10-03 黄绍新 Device for boiler flue gas waste heat utilization in thermal power unit
CN103438427A (en) * 2013-08-09 2013-12-11 天津诺能达能源科技有限公司 Gas-fired boiler afterheat recovering system and recovering method
CN103438427B (en) * 2013-08-09 2015-06-24 天津诺能达能源科技有限公司 Gas-fired boiler afterheat recovering system and recovering method

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20111130

Termination date: 20140325

C17 Cessation of patent right