CN202927865U

CN202927865U - Waste heat recovery device

Info

Publication number: CN202927865U
Application number: CN2012206075474U
Authority: CN
Inventors: 李法兴; 李子民
Original assignee: WEIFANG ZHONGYANG MACHINERY TECHNOLOGY Co Ltd
Current assignee: WEIFANG ZHONGYANG MACHINERY TECHNOLOGY Co Ltd
Priority date: 2012-11-17
Filing date: 2012-11-17
Publication date: 2013-05-08
Anticipated expiration: 2022-11-17

Abstract

The utility model discloses a waste heat recovery device, which is characterized in that a lower part of the waste heat recovery device is a heat absorption section, which is arranged in a tail discharge pipeline of a flue gas system of a boiler, the heat absorption section is provided with multiple heat discharge and absorption metal pipes, an upper part of the waste heat recovery device is a heat release section, which is arranged outside the tail discharge pipeline of the flue gas system of the boiler, and a heating water pipe penetrates through the heat release section. The waste heat recovery device has the advantages that on the premise of ensuring the safe operation of the device, a purpose of energy conservation through large recovery of waste heat of medium and low temperature flue gas is realized, dewing corrosion and clogging caused thereby are avoided, the service life is prolonged, and the maintenance cost of the device is reduced.

Description

A kind of waste-heat recovery device

Technical field

The utility model relates to a kind of waste-heat recovery device, and a kind of waste-heat recovery device of boiler smoke discharge tube specifically belongs to the waste-heat recovery device field.

Background technology

At present, the medium small boiler afterbody is not furnished with heat transmission equipment usually, and exhaust gas temperature is generally 170-280 ℃, and a large amount of smoke heat energies waste and are discharged in air.These invalid heat energy have not only polluted atmospheric environment, and have caused the thermic load of equipment to increase.The boiler operatiopn load can make steam pressure abnormal when heavier, and steam treatment is not enough, also can have influence on safety when serious.

Summary of the invention

In order to address the above problem, the utility model has designed a kind of waste-heat recovery device, be divided into endotherm section and heat release section two parts, under the prerequisite that guarantees equipment safety operation, the energy-conservation purpose of low-temperature flue gas waste heat in having realized significantly reclaiming, the stifled ash of having avoided dewing corrosion and having occured has thus extended service life, has reduced the maintenance cost of equipment.

The technical solution of the utility model is:

A kind of waste-heat recovery device, described waste-heat recovery device is divided into upper and lower two parts;

Described bottom is divided into endotherm section, be arranged in boiler smoke system afterbody discharge tube, described endotherm section is provided with some rows metal tube that absorbs heat, every row is absorbed heat the two ends up and down of metal tube by minute being connected communicating pipe, the two ends of described minute communicating pipe are connected by main communicating pipe respectively, thereby the metal tube that respectively absorbs heat of endotherm section is interconnected, and isolated with the external world, in described heat absorption metal tube, recirculated water is housed;

Described top is divided into heat release section, is arranged on outside boiler smoke system afterbody discharge tube, and a heating pipe passes described heat release section, and described heat release section is closed structure;

The main communicating pipe that described endotherm section is positioned at the upper end is connected with described heat release section by tedge; Described heat release section is positioned at being connected main communicating pipe of lower end by down-comer and described endotherm section.

boiler smoke system's afterbody horizontal segment or vertically section to install the heat exchanger hypomere additional be endotherm section, the structure of endotherm section is the sealed tube row bundle member of many parallel connections, when flue gas passes through the convection bank of endotherm section, the heat of flue gas is passed to the interior recirculated water of pipe, flue-gas temperature reduces, and after the absorption of the recirculated water in pipe heat, temperature raises and makes a part of recirculated water be evaporated to water vapour, water vapour is heat release section along the epimere that tedge enters heat exchanger, steam is through the interior water cooling to be heated of heating pipe of heat release section pipe, condense into water, turn back to along down-comer in the endotherm section of heat exchanger, thereby after being heated, the cold water that makes the heating pipe utilized.

The heat transfer process of heat exchanger can be summarized as: at endotherm section, exothermic ingredient is flue gas, the heat absorption material is the water as heat catalysis, water in endotherm section is airtight, the water of endotherm section absorbs heat in flue gas, water absorbs heat and is vaporizated into saturated vapor, rising to the heat exchanger epimere under certain pressure reduction is heat release section, cold water to extraneous heating pipe is emitted heat, and condense into liquid, turn back to endotherm section through down-comer, and vaporization again, reciprocation cycle has been completed the one-way heat conduction of heat from high-end biography to low side.

It is the sealed tube row bundle member of many parallel connections due to the structure of endotherm section, all the water and steam in pipe is the integral body that is mutually related, all under same saturation temperature, so its whole pipe metallic walls surface temperature overall distribution are even, keep less gradient temperature drop, temperature difference 10-15 ℃ with flue-gas temperature.Therefore, as long as control the saturation temperature of interior media well, just can realize the regulation and control to endotherm section tube wall surface temperature.

Advantage of the present utility model comprise following some:

(1) regulate the pressure and temperature of saturated vapor by the flow of controlling cold-patch water, the closed-loop control of realization to heating surface lowermost wall surface temperature, make wall surface temperature constant or adjustable, to adapt to the variation of fuel type and operating mode, thereby under the prerequisite that guarantees equipment safety operation, the energy-conservation purpose of low-temperature flue gas waste heat in realizing significantly reclaiming;

(2) when reducing exhaust gas temperature to greatest extent, keep the metal heated surface temperature of facing the wall and meditating to be in higher temperature levels, higher than acid dew point 10-15 ℃, corrosion area away from acid dew point, the stifled ash of fundamentally having avoided dewing corrosion and having occured thus, significantly extending the service life of heat exchanger, is 2-3 times of conventional heat pipe heat exchanger life-span, reduces the maintenance cost of equipment;

(3) realized that metal heated lowermost wall surface temperature of heat exchanger is in controlled accent state, make complex phase-change heat exchanger have the regulating power of suitable amplitude, exhaust gas temperature and wall surface temperature are kept relative stability, and can adapt to the variation of fuel band and the load 30-100% of various boilers;

(4) when having kept the efficient heat transfer characteristic that heat exchange of heat pipe has, carry out bleeding by the air bleeding valve on equipment, effectively eliminate on-condensible gas, make the equipment remain the high efficient heat exchanging state.

The utility model is described in further detail below in conjunction with drawings and Examples.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment waste-heat recovery device;

In figure: 1-endotherm section, 2-heat absorption metal tube, 3-divide communicating pipe, 4-master's communicating pipe, 5-heat release section, 6-heating pipe, 7-tedge, 8-down-comer.

The specific embodiment

Below preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the utility model, and be not used in restriction the utility model.

Embodiment 1

As shown in Figure 1, a kind of waste-heat recovery device, described waste-heat recovery device is divided into upper and lower two parts;

Described bottom is divided into endotherm section 1, be arranged in boiler smoke system afterbody discharge tube, described endotherm section 1 is provided with some rows metal tube 2 that absorbs heat, every row is absorbed heat the two ends up and down of metal tube 2 by minute being connected communicating pipe 3, the two ends of described minute communicating pipe 3 are connected by main communicating pipe 4 respectively, thereby the metal tube that respectively absorbs heat of endotherm section is interconnected, and isolated with the external world, in described heat absorption metal tube 2, recirculated water is housed;

Described top is divided into heat release section 5, is arranged on outside boiler smoke system afterbody discharge tube, and a heating pipe 6 passes described heat release section 5, and described heat release section 5 is closed structure, as airtight gas bag;

The main communicating pipe 4 that described endotherm section 5 is positioned at the upper end is connected with described heat release section 5 by tedge 7; Described heat release section 5 is connected with the main communicating pipe 4 that described endotherm section 5 is positioned at the lower end by down-comer 8.

Heat release section not only is used for heating water, also can be used for the heats cold air according to needs of production, is consistent with the principle of heating water.

It should be noted that at last: the above only is preferred embodiment of the present utility model, be not limited to the utility model, although with reference to previous embodiment, the utility model is had been described in detail, for a person skilled in the art, it still can be modified to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. waste-heat recovery device, it is characterized in that: described waste-heat recovery device is divided into upper and lower two parts;

Described bottom is divided into endotherm section, be arranged in boiler smoke system afterbody discharge tube, described endotherm section is provided with some rows metal tube that absorbs heat, every row is absorbed heat the two ends up and down of metal tube by minute being connected communicating pipe, the two ends of described minute communicating pipe are connected by main communicating pipe respectively, in described heat absorption metal tube, recirculated water are housed;