CN201748406U

CN201748406U - Dust deposition-prevention energy-saving heat exchanger

Info

Publication number: CN201748406U
Application number: CN2010202069511U
Authority: CN
Inventors: 黎海; 张静; 郭少宏; 刘胜利; 李耀荣; 陆燊
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-24
Filing date: 2010-05-24
Publication date: 2011-02-16
Anticipated expiration: 2020-05-24

Abstract

The utility model discloses a dust deposition-prevention energy-saving heat exchanger, which can reduce heat loss, improve combustion efficiency and ensure long-term normal operation of a boiler. The heat exchanger comprises spiral finned pipes mounted on a flue at the tail part of the boiler or an air duct at the outlet of a blower, and a water supply distributor arranged outside the boiler and connected with the spiral finned pipes. The dust deposition-prevention energy-saving heat exchanger can reduce heat loss, improve combustion efficiency and ensure long-term normal operation of the boiler.

Description

A kind of accumulatingdust energy-saving heat exchanger

Technical field

The utility model relates to a kind of heat exchanger of industrial circle, be particularly related in the waste heat recoveries such as a kind of flue gas that is applied to Industrial Boiler and low profile thermal power station boiler, waste water, and be widely used in the accumulatingdust energy-saving heat exchanger of industries such as papermaking, sugaring, heat supply, dyeing textile, pharmacy, hotel, machining sheet, thermoelectricity.

Background technology

China's coal-burned industrial boiler and little thermal power station boiler in service, the phenomenon that ubiquity efficient is low, energy consumption is high, its reason have all multifactor causing, wherein because of exhaust gas temperature higher and sewer directly to drain the phenomenon of waste waste heat the most general.At present, the manufacturing firm of domestic industry boiler and small plant's boiler generally chooses design about 180 ℃ when the design exhaust gas temperature, and the user is in use because use coal and design deviation are big, overload operation, cause exhaust gas temperature to surpass 200 ℃, make the central heat loss due to exhaust gas q of boiler thermal output ₂Obviously increase, 12 ℃ of the general every raisings of exhaust gas temperature, boiler efficiency descends 1%; Simultaneously, continuous blowdown in the middle of the boiler operatiopn and the high-temperature-hot-water in the periodical blowdown are all directly drained, and cause a large amount of waste heat wastes.Thereby, fully reduce exhaust gas temperature and the waste heat that utilizes sewer, to improving boiler efficiency, save energy loss important effect is arranged, in addition, the flue economizer of traditional design exists also that easy dust stratification stops up, heat transfer property is poor, and the not obvious shortcoming of energy-saving effect.

The utility model content

In order to address the above problem, the purpose of this utility model has been to provide a kind of accumulatingdust energy-saving heat exchanger that reduces the thermal losses of boiler, the efficiency of combustion that improves boiler and the long-time normal operation of assurance boiler.

For achieving the above object, the technical scheme that the utility model adopted is a kind of accumulatingdust energy-saving heat exchanger, it is characterized in that this heat exchanger comprise be installed on the boiler back end ductwork or the blower export air channel on spiral fin coil, and outside boiler, be connected with spiral fin coil give water dispenser.

More excellent, the epimere of described boiler is provided with the even expanding section of flue gas of taper.

More excellent, the even expanding section of described flue gas is provided with deashing device.

After adopting technique scheme, realized following three purposes: one, the heat that absorbs in the boiler exhaust gas advances boiler, improves boiler efficiency by reducing heat loss due to exhaust gas; Two, the heat that absorbs boiler blowdown water advances boiler, promotes the burning of boiler oil to raise the efficiency fully by improving the temperature of going into the stove air; Three, have automatic ash removing device and the even extending space of flue gas grey particle in the equipment, effectively prevent grey particle bump during economizer kinetic energy dissipation and gather, make the heating surface cleaning to keep suitable flow velocity, make the boiler long-play fouling phenomenon of the normal operation of boiler can not occur influencing.Experiment shows, by in many Industrial Boilers and little thermoelectricity boiler operatiopn test, general efficient can be raised the efficiency about 7%, with 10 tons of boilers is example, and by increasing energy-saving heat exchanger at back-end ductwork and sewer, the exhaust gas temperature that makes boiler is reduced to 135 ℃ by original 195 ℃, boiler efficiency improves 5%, bring up to 85 ℃ and advance the boiler air themperature by original 30 ℃, boiler efficiency improves about 3%, and overall efficiency improves 8%.Consumption coal (5000 kilocalorie II class bituminous coal) per hour 1.7 tons during as the boiler rated load operation, efficient is as improving 8%, and then Yi Nian economizes coal 1.7 * 20 * 300 * 8%=816 ton, and its direct economic benefit is calculated as 57.1 ten thousand yuan/every year for 700 yuan/ton by coal price.

Description of drawings

Fig. 1 is an overall structure schematic diagram of the present utility model;

Fig. 2 is the structural representation of deashing device among Fig. 1;

Fig. 3 is the structural representation of water dispenser among Fig. 1.

The specific embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail.

As shown in Figures 1 to 3, a kind of accumulatingdust energy-saving heat exchanger, this heat exchanger comprises and is installed on boiler 1 back-end ductwork or the spiral fin coil 2 on the blower export air channel, and outside boiler 1, be connected with spiral fin coil 2 give water dispenser 3, the epimere of described boiler 1 is provided with the even expanding section 4 of flue gas of taper, and the even expanding section 4 of described flue gas is provided with deashing device 5.

Preparation method, spiral fin coil 2 welds all fins and pipe contact position by ratio-frequency welding around fin entirely by Φ 42 * 3 seamless steel pipes are outer, and to reduce heat transfer resistance, fin is chosen thickness 1.5mm, and width is 19mm, and spacing is 10mm.According to the structural parameters of boiler 1 reality with vapour load design energy-saving heat exchanger, suitable flow velocity with assurance heat exchanger flue gas or air is the key factor that prevents dust stratification, again required spiral fin coil 2 is assembled by accompanying drawing, and after connecting with flue gas grey particle acceleration section.Be directly installed on the flue of boiler 1 afterbody or on the air channel of blower export, just can have moved.

Realize the effect of waste heat recovery, be installed on the flue of boiler 1 afterbody, be mainly used to heating boiler 1 inflow temperature, boiler 1 water inlet is carried out the adverse current heat convection by spiral fin coil 2 high-temperature flue gas (generally all at 200 ℃) inner and that pipe is outer, to advance the water at low temperature of boiler 1 (generally selects for use more than 50 ℃, corrode fin heat exchange pipe to prevent smoke condensation) the heating rising is more than 40 ℃, and high-temperature flue-gas is reduced to below 130 ℃.The heat that directly absorbs high-temperature flue gas by energy-saving heat exchanger returns boiler 1 more like this, has improved the efficient of boiler 1.When on the air channel that is installed in blower export, be mainly used to heating boiler 1 EAT, boiler 1 high-temperature water continuous and periodical blowdown carries out heat convection by spiral fin coil 2 cold airs inner and that pipe is outer, the cold air temperature is heated to 85 ℃ from 30 ℃ sends into boiler 1 participation burning of coal again, it is not only directly brought heat into and advances boiler 1, also can promote the burning of boiler 1 fuel to improve boiler 1 efficient fully simultaneously.

Above-described only is the preferred implementation of the utility model accumulatingdust energy-saving heat exchanger; should be understood that; for the person of ordinary skill of the art; under the prerequisite that does not break away from the utility model creation design; can also make some distortion and improvement, these all belong to protection domain of the present utility model.

Claims

1. accumulatingdust energy-saving heat exchanger, it is characterized in that this heat exchanger comprise be installed on the boiler back end ductwork or the blower export air channel on spiral fin coil, and outside boiler, be connected with spiral fin coil give water dispenser.

2. accumulatingdust energy-saving heat exchanger according to claim 1 is characterized in that the epimere of described boiler is provided with the even expanding section of flue gas of taper.

3. accumulatingdust energy-saving heat exchanger according to claim 2 is characterized in that the even expanding section of described flue gas is provided with deashing device.