CN201081559Y

CN201081559Y - Integrated fume cleaning and waste heat recovery device

Info

Publication number: CN201081559Y
Application number: CNU2007200962539U
Authority: CN
Inventors: 高亮; 张景辉; 高建东; 张曙光; 纪涛
Original assignee: TAIDA ENVIRONMENTAL PROTECTION CO Ltd TIANJIN; TIANJIN BOHAI ENVIRONMENT PROTECTION ENGINEERING Co Ltd
Current assignee: Tianjin Zijing Energy Technology Co., Ltd.
Priority date: 2007-06-05
Filing date: 2007-06-05
Publication date: 2008-07-02
Anticipated expiration: 2017-06-05

Abstract

The utility model discloses an integral device for flue gas purification and waste heat recovery, which comprises a spray reactor (1), a waste heat retriever (2) and a liquid collecting bellows (3), wherein, the waste heat retriever (2) is composed of a heat exchanging channel (8), a water pump (10) and a water tank (11); the integral device is serially connected by the spray reactor (1), the waste heat retriever (2) and the liquid collecting bellows (3) in sequence; a cooling water inlet of the waste heat retriever (2) is arranged at the lower end of the heat exchanging channel (8); a cooling water layer (14) and a flue gas flow layer (15) are arranged in the heat exchanging channel (8), a heat conducting pipe (9) is arranged vertically between the cooling water layer (14) and the flue gas flow layer (15), and the upper end of the heat exchanging channel (8) is provided with a hot water outlet (12). The utility model improves the efficiency of flue gas purification and waste gas recovery, has small occupied space for the device and flexible arrangement for the integral device, and is mainly used for eliminating smoke and dust of discharged flue gas.

Description

Gas cleaning and waste heat recovery integrated apparatus

Technical field

The utility model relates to a kind of device for eliminating smoke and dust, relates in particular to the integrated apparatus of a kind of gas cleaning and waste heat recovery.

Background technology

Contain SO in the discharged gas fume of boiler and kiln ₂, harmful components such as HCl and grit, also carry a large amount of unemployed heats simultaneously, if effectively do not handle, not only polluted air but also wasted the energy.The patent No. is 02223946.4 disclosed device for recovering residual heat of flue, and its main purpose is to reclaim the sensible heat of flue gas.As reclaiming the latent heat in the flue gas, then investment is big, and it is also big to take up room.Number of patent application is 200510031618.5 disclosed a kind of device for recovering residual heat of flue, the spiral flue sheet is set in the flue shell, cooling water flows downward along the spiral flue sheet, and then form is upwards mobile in the shape of a spiral for flue gas, and flue gas and cooling water are finished heat exchange in this flow process.Its shortcoming is: 1, flue gas directly contacts with cooling water, and the heated while of cooling water is also polluted by acidic materials in the flue gas and grit, is difficult to recycle, and easily forms secondary pollution; 2, in flue gas and the direct contact process of cooling water, though the globule has certain removal effect to flue gas middle acid substance and grit, purification efficiency is low.

Summary of the invention

The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of gas cleaning and waste heat recovery efficient height, equipment take up space gas cleaning and waste heat recovery integrated apparatus little, flexible arrangement are provided.

The purpose of this utility model is achieved like this:

Gas cleaning and waste heat recovery integrated apparatus comprise spray reactor (1), waste-heat recoverer (2), liquid collecting remittance bellows (3); Described spray reactor (1) is made up of magnesium hydroxide supplying tank (11), magnesium hydroxide transfer pump (10), spray nozzle (6) and reaction chamber (7); Waste-heat recoverer (2) is made up of heat exchanger channels (8), water pump (4) and water tank (5); It is characterized in that, integrated apparatus connects with series system according to the sequencing of spray reactor (1), waste-heat recoverer (2), liquid collecting remittance bellows (3), the cooling water inlet of waste-heat recoverer is arranged on the lower end of heat exchanger channels (8), be provided with cooling water layer (14) and flow of flue gas layer (15) in the heat exchanger channels (8), be provided with heat pipe (9) between cooling water layer (14) and the flow of flue gas layer (15), the upper end of heat exchanger channels (8) is provided with hot water outlet (12).

Described heat exchanger channels (8) is circular or other shapes.

The lower end of described waste-heat recoverer (2) is connected with the sidewall of liquid collecting remittance bellows (3).

The beneficial effects of the utility model are to have improved the efficient of gas cleaning and waste heat recovery, equipment little, the integrated apparatus flexible arrangement that takes up space.

Description of drawings

Fig. 1 is the structural representation of gas cleaning and waste heat recovery integrated apparatus;

Fig. 2 is the heat exchanger channels partial schematic diagram.

Description of symbols among the figure:

1---spray reactor 2---waste-heat recoverer

3---liquid collecting remittance bellows 4---water pump

5---water tank 6---spray nozzle

7---reaction chamber 8---heat exchanger channels

9---heat pipe 10---magnesium hydroxide transfer pump

11---magnesium hydroxide supplying tank 12---hot water outlet

13---flue gas condensing liquid outlet 14---cooling water layer

15---the flow of flue gas layer

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in Figure 1 and Figure 2, the utility model gas cleaning and waste heat recovery integrated apparatus adopt stainless steel material and conventional production process to process.

This gas cleaning and waste heat recovery integrated apparatus converge bellows 3 by spray reactor 1, waste-heat recoverer 2, liquid collecting and are formed by connecting with series system.Spray reaction case 1 is made up of magnesium hydroxide transfer pump 10, magnesium hydroxide supplying tank 11, spray nozzle 6 and reaction chamber 7.Waste-heat recoverer 2 is made up of heat exchanger channels 8, heat pipe 9, water pump 4, water tank 5.

Flue gas is at first entered by reaction chamber 7 tops, spray nozzle 6 is arranged on the middle part of reaction chamber 7, spray nozzle 6 sprays into the magnesium hydroxide solution in the magnesium hydroxide supplying tank 11 in the reaction chamber 7 along the flow of flue gas direction by magnesium hydroxide transfer pump 10, magnesium hydroxide is as desulfurizing agent commonly used, its deacidification effect Gao Yushui far away.In reaction chamber 7 excessive magnesium hydroxide contact with flue gas and with flue gas in most of SO ₂, HCl harmful components generation physics and chemical action, generate MgSO ₃, MgSO ₄, MgCl ₂, these salts substances are present in the droplet solution with hypersaturated state, and the grit in the flue gas then adsorbs with droplet, and quality and volume all strengthen to some extent.Simultaneously, the heat in the flue gas enters in the droplet with the form of latent heat and sensible heat.

Reaction chamber 7 lower ends are connected with heat exchanger channels 8 upper ends, and heat exchanger channels 8 adopts spiral form, are circular or other shapes, be divided into upper and lower two-layer, promptly cool off water layer 14 and flow of flue gas layer 15, the upper strata is for flow of cooling water and absorb heat, and lower floor is for flow of flue gas and release heat.Be the enhanced heat exchange effect, the vertical direction between the upper and lower layer is provided with some heat pipes 9.Flue gas by conduction heat release and droplet condensation heat, heats the upper strata water body when flowing through the flow of flue gas layer 15 of heat exchanger channels 8.Cooling water is after sending into water tank 5 by water pump 4, and the lower end by heat exchanger channels 8 enters cooling water layer 14 again.Because flue gas and cooling water directly do not contact, so after cooling water is heated to 50 ℃～100 ℃, be directly used in any occasion that needs hot water, heat can be recycled easily by hot water outlet 12 quilts.

Heat pipe 9 is a kind of heat transfer elements with high thermal conductivity, its evaporation by working medium in the Totally enclosed vacuum shell is transmitted heat with condensing, but the heat transfer area with high thermal conductivity, good isothermal, cold and hot both sides can change series of advantages such as remotely transferring, temperature controllable arbitrarily.

Typical heat pipe is airtight hollow metal pipe, add and to be evacuated in the pipe earlier man-hour, under this state, charge into an amount of working medium, when the lower end of heat pipe is heated, working medium absorbs heat and is vaporizated into steam, under small pressure reduction, rises to the heat pipe upper end, and emit heat to the external world, be condensed into liquid.Condensate liquid turns back to heating section along the heat pipe inwall under the effect of gravity, and the vaporization of being heated once more, so moves in circles, and continuously heat is passed to the other end by an end.Owing to be phase-change heat transfer, therefore the heat pipe internal thermal resistance is very little, its capacity of heat transmission is compared with metals such as silver, copper, aluminium, the heat pipe of Unit Weight can transmit the heat of several magnitude more, thus can obtain the bigger coefficient of overall heat transmission with the less temperature difference, and simple in structure, characteristics with one-way heat conduction, particularly because the peculiar mechanism of heat pipe is all carried out the heat exchange between cold fluid and hot fluid outside pipe, this just can carry out augmentation of heat transfer easily.In addition, because heat pipe inside generally is evacuated, working medium is very easily seethed with excitement and evaporation, and heat pipe starts very fast.

The flue gas that is flowed out by reaction chamber 7 enters heat exchanger channels 8, remaining SO in the flue gas ₂, the HCl harmful components continue and magnesium hydroxide generation physics and chemical action, to generate product the same.Flue gas carries out heat exchange with cooling water in the process that the heat exchanger channels 8 along waste-heat recoverer 2 flows downward, flue-gas temperature constantly reduces, and reaches dew point, and a large amount of dewfall of moisture wherein also form condensate liquid, is present in MgSO in the droplet solution with hypersaturated state ₃, MgSO ₄, MgCl ₂Deng salts substances the moisture in flue gas is formed flue gas condensing liquid, and flow downward along the base plate of heat exchanger channels 8.In addition, along with flue-gas temperature constantly reduces, volume reduces gradually, and the flow velocity of flue gas in heat exchanger channels 8 constantly reduces, and its carrying capacity also constantly descends, and sedimentation will take place the grit in the flue gas, or the liquid absorption that is condensed.

The lower end of heat exchanger channels 8 is connected with the sidewall of liquid collecting remittance bellows 3, and the top of liquid collecting remittance bellows 3 is connected with exhaust system.Flue gas is finished purification and heat transfer process in spray reactor 1, waste-heat recoverer 2 after, clean flue gas is entered by the sidewall of liquid collecting remittance bellows 3, discharge at top by liquid collecting remittance bellows, and flue gas condensing liquid is recovered after then being flowed out by the flue gas condensing liquid outlet 13 of liquid collecting remittance bellows 3 bottoms.

Claims

1. gas cleaning and waste heat recovery integrated apparatus comprise that spray reactor (1), waste-heat recoverer (2), liquid collecting converge bellows (3); Described spray reactor (1) is made up of magnesium hydroxide supplying tank (11), magnesium hydroxide transfer pump (10), spray nozzle (6) and reaction chamber (7); Waste-heat recoverer (2) is made up of heat exchanger channels (8), water pump (4) and water tank (5); It is characterized in that, integrated apparatus connects with series system according to the sequencing of spray reactor (1), waste-heat recoverer (2), liquid collecting remittance bellows (3), the cooling water inlet of waste-heat recoverer (2) is arranged on the lower end of heat exchanger channels (8), be provided with cooling water layer (14) and flow of flue gas layer (15) in the heat exchanger channels (8), vertical direction between cooling water layer (14) and the flow of flue gas layer (15) is provided with heat pipe (9), and the upper end of heat exchanger channels (8) is provided with hot water outlet (12).

2. according to the gas cleaning and the waste heat recovery integrated apparatus of claim 1, it is characterized in that described heat exchanger channels (8) is circular.

3. according to the gas cleaning and the waste heat recovery integrated apparatus of claim 1, it is characterized in that the lower end of described waste-heat recoverer (2) is connected with the sidewall of liquid collecting remittance bellows (3).