CN108870427A - A kind of fume waste heat recyclable device - Google Patents

Abstract

The present invention discloses the fume waste heat that a kind of pair of natural gas boiler generates and carries out recyclable device.Include in apparatus of the present invention：Being vertically arranged upper part is the smoke outlet tubulose exhaust gases passes directly emptied, it is set to the input cooling water replenishment pipe inside exhaust gases passes and being located therein, is provided with flue gas distributor at the flue gas connecting tube of lower part, the outlet flue of flue gas connecting tube, be provided with heat exchanger in device.The present invention can more fully recycle the energy in discharge flue gas, while be greatly improved the quality of flue gas emission.Apparatus structure is relatively easy, and using effect is reliable.

Description

A flue gas waste heat recovery device

technical field

The invention relates to a waste heat recovery device, in particular to a waste heat recovery device for flue gas produced by a natural gas boiler.

Background technique

With the continuous deepening of the country's energy-saving and emission-reduction work, the scientific, safe and effective flue gas waste heat recovery device, as an efficient energy-saving and environmental protection device, can not only save a lot of energy, but also eliminate noise and beautify the environment. It is an important measure to reduce energy consumption, reduce the cost of enterprise products, and increase the economic benefits of enterprises.

Chinese invention patent application 201510922540X discloses a commercial gas boiler flue gas waste heat recovery device. The device includes a shell, and the inside of the shell is vertically installed with a water inlet main pipe and a water outlet main pipe. A water outlet pipe is installed on the top of the main pipe, and a manual valve is installed on the water inlet pipe and the water outlet pipe. A square finned tube is installed between the water inlet main pipe and the water outlet main pipe, and fins are installed on the square finned pipe. However, such devices have no effect on the removal of pollutants present in the flue gas.

Chinese invention patent application 2012100703417 discloses a waste heat utilization system for waste incineration flue gas, including a waste incinerator and a heat recovery heat exchanger. The heat recovery heat exchanger is divided into a heat evaporation area and an air inlet and outlet area. The air inlet and outlet areas are equipped with waste incineration flue gas Inlet and flue gas outlet, on the path connecting the waste incineration flue gas inlet to the thermal evaporation area, a flue gas steering valve and a flue gas inlet closing valve are arranged in turn, and a smoke outlet valve is also arranged on the path from the thermal evaporation area to the flue gas outlet. The gas shut-off valve is provided with an evaporation tube in the thermal evaporation area. The steam outlet end of the evaporation tube is connected to a heat load output utilization device, and the cold water output port of the heat load output utilization device is connected to the water inlet end of the evaporation tube.

The existing technologies have the following common deficiencies, namely: 1) the device either cannot treat the pollutants in the flue gas, or the treatment effect is poor; 2) the heat exchange efficiency is low; 3) the outlet water temperature is relatively low, and the outlet water The temperature fluctuates widely.

Contents of the invention

The invention provides a flue gas waste heat recovery device which can overcome the disadvantages of the prior art, in particular a device suitable for recovering flue gas waste heat of a natural gas boiler.

A flue gas waste heat recovery device of the present invention includes: a pipe-shaped flue gas channel with a smoke exhaust port arranged vertically, the upper part of which is directly emptied; The flue gas connecting pipe and the smoke outlet of the flue gas connecting pipe are provided with a flue gas distributor, and a heat exchanger is arranged in the device, and the heat exchanger described here can be a tube heat exchanger or a plate heat exchanger Heat exchanger, the interior of the middle part of the flue gas channel of the device is equipped with a circulating water atomization and spreading device, and the input end of the circulating water atomization and spreading device is respectively connected with the heating medium output end of the heat exchanger and the input cooling water supply pipe, and the heat exchanger The heating medium input end of the heat exchanger is connected to the water outlet, and the heating medium input end of the heat exchanger is connected to the water outlet. The lower part of the tubular flue gas channel is a mixing chamber, and a water outlet is arranged in the mixing chamber below the smoke outlet of the flue gas connecting pipe. A blowdown pipe is arranged at the bottom of the flue gas, and the cooling water surface in the mixing chamber at the lower part of the tubular flue gas channel is lower than the position of the smoke outlet of the flue gas diversion distribution device in the working state. In this device of the present invention, since the flue gas guide distributor is arranged at the smoke outlet of the flue gas connecting pipe, the flue gas can be evenly diffused, and the contact area between the flue gas and the cooling water is increased, so that the flue gas and the cooling water The water is fully contacted, thereby improving the heat exchange rate; the design of the circulating water atomization device connected to the heat exchanger can make the heating medium (that is, the cooling water) circulate, on the one hand, it can save water, on the other hand, it can also reduce the temperature of the heating medium. Keeping it within a certain range greatly reduces the temperature fluctuation of the output heat energy; due to the use of circulating water atomization and spreading device, the heating medium can be sprayed out in the form of mist, forming a large area of water mist group, and the formation of micro mist can be more fully integrated with The overflowing flue gas performs heat exchange, and at the same time, it can wash the flue gas and further purify the discharged gas.

Preferably, in the tubular flue gas channel of the flue gas waste heat recovery device of the present invention: an anti-pollution condensation device is arranged between the top of the circulating water atomizing and distributing device and the top of the flue gas channel; A multi-cavity heat absorbing device is arranged between the lower part and the smoke outlet of the flue gas diversion distribution device. The multi-cavity heat absorbing device can make the lower temperature droplets or liquid flow formed by the water mist discharged from the atomization device flow through the interior of the device, thereby forming a water film layer in the multi-layer hole area, making it compatible with the multi-layer hole. The waste heat of the flue gas in the cavity heat absorbing device performs more sufficient heat exchange; the anti-fouling condensing device can attach the water vapor generated after the heat exchange between the flue gas and water to the inside of the anti-fouling condensing device, thereby further condensing into condensate Liquid and can form a water film in the device to prevent air from entering the tower and affect the heat exchange efficiency.

Preferably, the circulating water atomization and spreading device in the flue gas waste heat recovery device of the present invention consists of a liquid phase distributor integrated on the water collecting head, a swirl scattering atomizer connected with the liquid phase distributor, and a cooling water supply pipe It consists of a connected water replenishment diffuser, a swirl tube located upstream of the liquid phase distributor, and a swirl seal. The circulating water atomizing and distributing device of the present invention adopts the design of the swirl scattering atomizer, which can spray the circulating water in a mist form at a certain helical angle, which reduces the laminar flow area formed between the walls of the flue gas channel and makes the smoke The air and water mist can be more fully contacted; while the cooling water replenishment is sent into the device through an additional water replenishment diffuser, which can greatly reduce the temperature fluctuation of the working medium (that is, the cooling water) caused by replenishing the cooling water, and further stabilize the output heat energy temperature range.

Preferably, in the flue gas waste heat recovery device of the present invention, the antifouling condensation device and the multi-cavity heat absorbing device arranged in the gas channel are respectively detachable. In the present invention, the multi-cavity heat-absorbing device and the anti-pollution condensation device are detachably arranged, which can facilitate the cleaning and maintenance of these devices.

Preferably, the antifouling condensation device of the waste heat recovery device for flue gas of the present invention is composed of multi-layer stainless steel plates with warped surfaces.

Preferably, the flue gas waste heat recovery device of the present invention is characterized in that the multi-cavity heat-absorbing device is made of a stainless steel plate with irregular convex-concave shapes processed on the multi-layer surface, and there are several small through holes on it. The rules are superimposed.

The advantages of the present invention are as follows:

1. The energy in the exhaust flue gas can be recovered more fully;

2. It can greatly improve the quality of flue gas emission;

3. The structure of the device is relatively simple, and the use effect is reliable

4. The vertical tower body occupies a small area, and the built-in multi-cavity heat absorption device and the water replenishment cooling atomization device are installed at different heights to effectively absorb the waste heat of the flue gas;

5. The design of the flue gas diversion distributor can spread the flue gas evenly, so as to increase the distribution area of the flue gas, so that the flue gas can fully contact with the cooling water, thereby improving the heat exchange rate. 3. The design of the water supply cooling atomization device can The hot water in the lower tower circulates back and forth through pressurization to make the water mist spray out at a certain helical angle, forming a large area of water mist group, forming a micro mist space that completely covers the upper space of the multi-cavity heat absorbing device, which can be combined with part of the overflow multi-cavity absorber The flue gas of the heating device is exchanged for heat;

6. The design of the multi-cavity heat-absorbing device can flow the lower temperature droplets or liquid flow formed by the water mist in the water replenishment cooling atomization device through the device, thereby forming a water film layer in the multi-layer hole area, and its It can fully exchange heat with the flue gas waste heat in the multi-cavity heat absorbing device;

7. The design of the anti-fouling condensing device can attach the water vapor generated after the heat exchange between the flue gas and water to the inside of the anti-fouling condensing device to further condense into a condensate and form a water film in the device to prevent air from entering the tower body and affecting heat exchange efficiency.

Description of drawings

Figure 1 is an overall schematic diagram of the device of the present invention.

Fig. 2 is a schematic diagram of the flue gas channel structure of the device of the present invention.

FIG. 3 is an enlarged left view of FIG. 2 .

FIG. 4 is an enlarged right view of FIG. 2 .

Fig. 5 is a partially enlarged view of "I" in Fig. 2 .

Fig. 6 is a front view of the rainproof cap 7.

Fig. 7 is a right side view of Fig. 6 .

FIG. 8 is a front view of the upper tower body 22 .

FIG. 9 is a top view of FIG. 8 .

FIG. 10 is a front view of the antifouling condensation device 10 .

FIG. 11 is a top view of FIG. 10 .

FIG. 12 is a front view of the replenishment cooling atomization device 13 .

Fig. 13 is a bottom view of Fig. 12 .

FIG. 14 is a top view of FIG. 12 .

Fig. 15 is a front view of the water collecting head 13-1.

FIG. 16 is a schematic diagram of a rotating cross-sectional view at position A-A of FIG. 15 .

Fig. 17 is a schematic diagram of the liquid phase distributor 13-2.

FIG. 18 is a schematic cross-sectional view of FIG. 17 .

Fig. 19 is a schematic diagram of the bracket B11.

FIG. 20 is a schematic cross-sectional view of FIG. 19A-A.

Fig. 21 is a front view of the fixing block B29.

FIG. 22 is a schematic longitudinal sectional view of the middle tower body 15 .

FIG. 23 is a front view of the middle tower body 15 .

FIG. 24 is a schematic top view of FIG. 23 .

Fig. 25 is a schematic diagram of the plates of the multi-cavity heat absorbing device of the present invention.

Fig. 26 is a bottom view of Fig. 25 .

Fig. 27 is a schematic diagram of bracket A17.

FIG. 28 is a schematic cross-sectional view along line A-A of FIG. 27 .

FIG. 29 is a front view of the fixing block A18.

FIG. 30 is a schematic cross-sectional view of the flue gas diversion distributor 6 .

Fig. 31 is a schematic diagram of the smoke distributor 6-4.

FIG. 32 is a top view of FIG. 31 .

FIG. 33 is a schematic longitudinal sectional view of the lower tower body 5 .

FIG. 34 is a top view of FIG. 33 .

FIG. 35 is a schematic diagram of the base 1 .

FIG. 36 is a top view of FIG. 35 .

Figure 37 is a left view of Figure 35.

Fig. 38 is a schematic diagram of the media in the preceding figures.

Detailed ways

Accompanying drawing is the schematic diagram of a preferred embodiment of the present invention. Below in conjunction with accompanying drawing explanation.

The device of the present invention is composed of a vertically arranged tubular flue gas channel and a heat exchanger 38 composed of an upper tower body 22 , a heat absorption chamber 26 and a lower tower body 5 , see accompanying drawings 1 and 2 .

It can be seen from accompanying drawings 1 to 3 that the top of the tubular flue gas channel of the present invention is equipped with a rainproof cap 7, and the lower end of the rainproof cap 7 is symmetrically welded with connecting rods 7-1 and 7-2. The connecting rods 7-1 and 7-2 are respectively fixedly connected with the upper tower body 22 through two sets of symmetrical fasteners 23-1, 23-2, 23-3 and 23-4. A group of lifting lugs 80-1 and 80-2 are welded at an angle between the top of the upper tower body 22 and the connecting rods 7-1 and 7-2. Pass through the right side wall of the upper tower body 22 and communicate with the condensation chamber 24 (that is: the inner cavity of the upper tower body) to form an angle welded with a nozzle 9 for installing a thermometer, and the cavity of the upper tower body 22 at the lower part of the temperature nozzle 9 An antifouling condensation device 10 is housed in the body. The lower tower body cavity 24 of the upper tower body 22 in the flue gas channel is equipped with a circulating water atomization and spreading device 13 , which passes through the tower wall and is welded and fixed to the outer wall of the upper tower body 22 . The circulating water atomizing and distributing device communicates with the output end of the heating medium of the heat exchanger 38 through the tube C, and the flange 13-6 and the flange 40 are respectively fixedly arranged on the tube C. The upper tower body middle flange 22-1 is welded at the lower end surface of the upper tower body 22 . The upper end face of the middle tower body 15 is also welded with the middle tower body middle flange 15-1 and the upper tower body 22 lower end face is welded with the upper tower body middle flange 22-1 and is fixedly connected by six sets of fasteners. A gasket 21 is arranged between the flange 15-1 in the middle tower body and the flange 22-1 in the upper tower body. The flange 15-1 bottom right side in the middle tower body passes through the middle tower body 15 tower walls and is welded with a heat absorption cavity inspection hole assembly 14. The inspection hole assembly 14 of the heat-absorbing cavity is composed of an inspection hole connecting pipe A14-3, an inspection hole connecting flange A14-2, an inspection hole end blind plate A14-1, and a sealing gasket 14-4. The inspection hole connection pipe A14-3 penetrates through the tower wall of the middle tower body 15 and the heat absorption chamber 26 and is welded and fixed on the outer wall of the tower wall. The inspection hole connection pipe A14-3 is welded with an inspection hole connection flange A14-2. The blind plate A14-1 at the end of the inspection hole is fixedly connected to the connecting flange A14-2 of the inspection hole through a double-ended stud and a hexagon nut. A multi-cavity heat absorbing device 16 is installed in the heat absorbing chamber 26 at the bottom of the heat absorbing cavity inspection hole assembly 14 . A thermometer nozzle 20 is welded through the wall of the middle tower body 15 , and a screw plug 19 is installed at the end of the thermometer nozzle 20 . The lowermost end of the middle tower body 15 is welded with the middle tower body middle flange 15-2, and the middle tower body middle flange 15-2 is fixedly connected to the middle flange lower tower body 5 of the lower tower body 5 by studs and hex nuts. -1. A gasket 25 is provided between the flange 15-2 in the middle tower body and the flange 5-1 in the lower tower body. On the left side of the lower part of the middle flange 5-1 of the lower tower body, a flue gas diversion distributor 6 is welded through the tower wall of the lower tower body 5 . The lower part of the flue gas diversion distributor 6 on the right side of the lower tower body 5 is welded with the mixing chamber inspection hole assembly 4, the inspection hole connecting pipe B4-3, the inspection hole connecting flange B4-2, and the blind plate at the end of the inspection hole B4-1 constitute. The inspection hole connection pipe B4-3 penetrates the tower wall of the lower tower body 5 and communicates with the mixing chamber 28 and is welded and fixed with the outer wall of the tower wall. The inspection hole connection pipe B4-3 is welded with an inspection hole connection flange B4-2 on the end face. The blind plate B4-1 at the end of the inspection hole is fixedly connected with the connecting flange 4-2 of the inspection hole through studs and hexagon nuts. The bottom of the mixing chamber inspection hole assembly 4 is welded with a water outlet flange 27 . The outlet flange 27 communicates with the heating medium input end of the heat exchanger 38 through the pipeline B, and the pipeline B is respectively provided with a cut-off valve 36, a filter 35, a water flow meter 34, a check valve 37 and a connection flange. 39, etc. Two liquid level gauge flanges 28 and 29 and an overflow port flange 30 are welded at an angle to the water outlet flange 27 . Through the base 1 of the lower tower body 5 and the mixing chamber 28, a sewage pipe 3 and a sewage flange 2 are welded, and the sewage pipe 3 and the sewage flange 2 extend outside the wall of the lower tower body 5.

The heat exchanger 38 of the present invention can be a tube heat exchanger or a plate heat exchanger.

The anti-pollution condensation device 10 of the present invention is made of stainless steel materials in random arrangement to form a number of "honeycomb" through holes (that is: tiny holes), see Figure 9 and Figure 10, and the plate shape is warped, after multi-layer stacking Its function is: water vapor can form a water film on the surface of the "honeycomb" hole to quickly condense, effectively preventing water vapor from overflowing the tower body. The lower end surface of the anti-fouling condensation device 10 is placed on the upper end surface 11-1 of the bracket B11, without fixed connection, it is convenient to take out, clean and replace in the condensation chamber 24 of the deep upper tower body 22. The lower end surface 11-2 of the bracket B11 is placed on the upper end surface 29-1 of the three evenly distributed fixed blocks B29, and there is no fixed connection to facilitate taking out and cleaning in the condensation cavity 24 of the deep upper tower body 22. The side surfaces 29 - 2 of the fixing block B29 are uniformly welded on the same horizontal plane of the side wall of the condensation chamber 24 .

Referring to accompanying drawings 11-17, the replenishing water cooling atomization device 13 of the present invention is composed of a water collecting head 13-1, a liquid phase distributor 13-2, a sealing gasket A13-3, and six swirling flow scattering atomizers 13-4, 13 -11, 13-12, 13-13, 13-14 and 13-15, water supply diffuser 13-5, swirl interface flange 13-6, swirl pipe 13-7, water supply pipe 13-8, water supply pipe Interface flange 13-9, gasket B13-10 constitutes. The swirl pipe 13-7 passes through the tower wall of the upper tower body 22 and is welded to the outer wall. The swirl pipe 13-7 is welded with a swirl interface flange 13-6 at one end outside the tower wall, and the other end is connected to the water collecting head 13-1. The eccentric hole 13-1-3 of the end face 13-1-1 is welded into one body. The eccentric hole 13-1-3 of the water collecting head 13-1 communicates with the annular groove 13-1-4 of the lower end surface 13-1-6 of the water collecting head 13-1. While supplying water to the six swirl diffuser atomizers 13-4, the volume of the replenishment cooling atomizer 13 is reduced. The water replenishment pipe 13-8 at an angle with the swirl pipe 13-7 passes through the tower wall of the upper tower body 22, and is welded and fixed with the side wall of the tower wall. Water supply pipe 13-8 is welded with water supply pipe interface flange 13-9 at one end outside the wall, and the other end is welded into one with the central platform hole 13-1-2 of water collecting head 13-1 upper end face 13-1-1. The concentric hole 13-1-7 with the center platform hole 13-1-2 penetrates the lower end surface 13-1-6 of the water collecting head 13-1. The lower end surface 13-1-6 of the water collecting head 13-1 is matched with the upper end surface 13-2-6 of the liquid phase distributor 13-2, and the sealing gasket A13-3 and the sealing gasket B13-10 are respectively placed in the liquid phase. In the concentric ring grooves 13-2-7 and 13-2-8 of the upper end surface 13-2-6 of the distributor 13-2. Its function is to effectively separate the swirling inflow water from the replenishing water, prevent the water entering the six swirl scattering atomizers 13-4 and the water replenishing diffuser 13-5 from crossing each other, and solve the problem that water pressure and water volume are difficult to control. Through the four through holes 13-2-1, 13-2-3, 13-2-4 and 13-2 respectively from the lower end surface 13-2-2 of the liquid phase distributor 13-2 by four hexagon head bolts In -5, they are respectively fixedly connected with four threaded holes 13-1-5, 13-1-8, 13-1- and 13-1-10 of the water collecting head 13-1. Six threaded holes 13-2-, 13-2-10, 13-2-11, 13-2-12, 13-2-13 and 13-2-14 of the liquid phase distributor 13-2 are respectively equipped with six Swirl flow scattering atomizer 13-4, the threaded hole 13-2-15 of liquid phase distributor 13-2 center is equipped with replenishing water diffuser 13-5. The water collecting head 13-1, the liquid phase distributor 13-2, the six swirl scattering atomizers 13-4 and the swirl scattering 13-3 extend into the heat-absorbing cavity 26 of the middle tower body 15,

Referring to accompanying drawings 25 and 26, the multi-cavity heat absorbing device 16 of the present invention is formed by superimposing multi-layer stainless steel plates with irregularly arranged small holes in irregular convex and concave shapes. Its function is: the superposition of irregular convex and concave shapes avoids the phenomenon of overlapping of stainless steel plates and can form a multi-cavity for containing smoke, and the tiny water droplets scattered and atomized form a water film on the surface of several small holes, which is equivalent to the smoke being contained in A water film cavity, thereby increasing the efficiency of heat exchange of flue gas. The multi-cavity heat absorbing device 16 is placed on the upper end surface 17-1 of the support A17, and there is no fixed connection to facilitate taking out, cleaning and replacing in the heat absorbing cavity 26 of the deep middle tower body 15. The lower end face 17-2 of the support A17 is placed on the upper end face 18-1 of three evenly distributed fixed blocks A18, and there is no fixed connection to facilitate cleaning in the heat-absorbing cavity 26 of the deep middle tower body 15. The side surfaces 18 - 2 of the fixing block A18 are uniformly welded on the same level as the side wall 26 - 1 of the heat absorption cavity 26 .

Referring to accompanying drawings 29-31, the flue gas guide distributor 6 of the present invention consists of a flue gas connecting flange 6-1, a flue gas connecting pipe 6-2, a flue gas guiding pipe 6-3, and a flue gas distributor 6- 4 composition. The flue gas connecting pipe 6-2 penetrates the tower wall 4 and is welded and fixed on the outside of the tower wall. One end of the tower body is sequentially welded with a flue gas guide pipe 6-3 and a flue gas distributor 6-4.

The flue gas distributor 6-4 of the present invention is a cylindrical hollow pipe with several small holes on the wall of the pipe, and the flue gas guide pipe 6-3 is a hollow 90-degree elbow, one end of which is connected to the flue gas distributor. One end of 6-4 is welded, and the other end is welded with a flue gas connecting pipe 6-2, and the flue gas connecting pipe 6-2 is a cylindrical hollow pipe. 6-2, 6-3, 6-4 are welded together to form the flue gas diversion distributor 6. The flue gas connection pipe 6-2 penetrates the tower wall 4 and is welded to the outer side of the tower wall, and the flue gas diversion distributor 6 is placed in the tower body cavity. 6-4 is placed in the tower body cavity and does not contact the tower wall. The two ends of 6-3 are open, and 6-2 and 6-3 are welded respectively. Its function is to guide the flue gas through the flue gas diversion distributor 6. Spread the flue gas evenly in the mixing chamber 28 to increase the contact area with the water in the mixing chamber 28, so as to perform sufficient heat exchange.

The working process of the device of the present invention is as follows:

In the initial stage of operation, the cooling water is injected through the pipe A, and the cooling water is sprayed into the multi-cavity to absorb heat through the water supply pipe 13-8, the water collecting head 13-1, the liquid phase distributor 13-2, and the water supply diffuser 13-5 The device 16 (the cooling water sprayed into the multi-cavity heat-absorbing device 16 in a scattering manner also forms a water film in the multi-cavity) enters the mixing chamber 28 to the set liquid level, and the cooling water injection valve 33 is cut off.

First-stage heat exchange process: start the frequency conversion hot air blower 31 in the pipeline F, suck the flue gas at 165°C in the pipeline F into the absorption chamber 32, and enter the mixing chamber 28 through the flue gas diversion distributor 6 to fully mix with the cooling water to form First-stage heat exchange, part of the flue gas overflowing the cooling water diffuses into the heat-absorbing chamber 26 of the middle tower body 15 and enters the multi-cavity heat-absorbing device 16 to fully exchange heat with the water film in the multi-cavity heat-absorbing device 16 . This first-stage heat exchange can absorb 85% of the flue gas heat. The water vapor and clean flue gas produced after the heat exchange between the cooling water and the flue gas continue to rise into the condensation chamber 24 and the anti-pollution condensing device 10, the water vapor is cooled again, and the flue gas overflowing to the atmosphere through the anti-pollution condensing device 10 has a temperature of 45°C and dissolve air pollutants such as sulfides and nitrogen oxides in the original flue gas in cooling water.

Secondary heat exchange process: one end of the hot water outlet pipe B is connected to the water outlet flange 27 of the lower tower body 5, and the other end is connected to the hot water inlet flange 39 of the heat exchanger 38. The hot water outlet flange 40 of the heat exchanger 38 is connected to the pipeline C, and the other end of the hot water inlet pipeline C is connected to the swirl interface flange 13-6 of the replenishment cooling atomization device 13. The cold water (normal temperature) inlet pipe E of the heat exchanger 38 is connected to the cold water inlet flange 41 of the heat exchanger 38, and the water outlet flange 42 of the heat exchanger 38 is connected to the cold water outlet pipe D. The hot water in the mixing chamber 28 is pumped into the heat exchanger 38 by the centrifugal pump 34 through the hot water outlet pipe B, the shut-off valve 36, the filter 35 and the check valve 37. The exchanged water passes through the filter 38 , the check valve 39 , the exchanged water flowmeter 40 and is driven into the heat exchanger 38 by the centrifugal pump 41 . After heat exchange between hot water and cold water (normal temperature), the cooled hot water enters the replenishment cooling atomization device 13 through the pipeline C, and passes through the water collecting head 13-1, the liquid phase distributor 13-2, and six swirl scattering mist The atomizer 13-4, 13-11, 13-12, 13-13, 13-14, 13-15 sprays and atomizes the hot water in the multi-cavity heat absorbing device 16, and continuously enters the multi-cavity heat absorbing device. The flue gas in the device 16 undergoes heat exchange and then flows into the mixing chamber 28 to mix and exchange heat with the inhaled flue gas. The flue gas overflowing from the multi-cavity heat absorbing device 16 can also exchange heat in the heat absorbing chamber 26 . The water vapor generated by the heat exchange continues to enter the anti-fouling condensing device (10) to continue cooling, and the clean flue gas is discharged into the atmosphere; the cold water (normal temperature) entering the heat exchanger 38 from the pipe E rises to a temperature greater than 60°C after heat exchange Hot water is exported and utilized through pipeline D.

The device of the present invention is to reuse the water in the mixing chamber 28, fully absorb the heat in the flue gas through the primary heat exchange and the secondary heat exchange, and dissolve the sulfide, nitrogen oxide, etc. in the flue gas through the water in the mixing chamber 28 air pollutants. When the amount of water in the mixing chamber 28 is insufficient, water can be replenished through the water collecting head 13-1, the liquid phase distributor 13-2, and the water replenishing diffuser 13-5.

To sum up: the present invention uses a flue gas diversion distributor to spread and distribute the flue gas, and fully contacts with the cooling water in the mixing chamber for energy exchange; The area water mist group covers the upper space of the multi-cavity heat-absorbing device, so that the cavity heat-absorbing device forms a water film, and the water film in the multi-cavity heat-absorbing device can fully absorb the heat of the flue gas contained in the cavity; the anti-pollution condensation device It can make the water vapor generated after the heat exchange between the cooling water and the flue gas form a water film in the device to quickly condense, effectively preventing the water vapor from overflowing the tower body.

Because the present invention adopts the aforementioned related technical measures, the temperature fluctuation range of the output heating medium is kept to the minimum, and at the same time, the pollutants in the discharged flue gas can be fully removed.

Claims (6)

1. A flue gas waste heat recovery device, comprising: vertically arranged a pipe-shaped flue gas channel whose upper part is directly emptied, an input cooling water supply pipe located inside the flue gas channel and located in the middle, and a pipe located in the lower part The flue gas connecting pipe and the smoke outlet of the flue gas connecting pipe are provided with a flue gas distributor. The input end of the water atomization dispersing device is respectively connected with the heating medium output end of the heat exchanger and the input cooling water supply pipe, the heating medium input end of the heat exchanger is connected with the water outlet, and the heating medium input end of the heat exchanger is connected with the water outlet. The lower part of the tubular flue gas passage is a mixing chamber, in which a water outlet is located below the smoke outlet of the flue gas connecting pipe, and a sewage pipe is arranged at the bottom of the flue gas. In the working state, the mixing chamber at the lower part of the tubular flue gas passage The water surface of the intermediate cooling water is lower than the position of the smoke outlet of the flue gas diversion distribution device. 2. The flue gas waste heat recovery device according to claim 1, characterized in that in the tubular flue gas channel: an anti-fouling condensation device is arranged between the top of the circulating water atomization and spreading device and the top of the flue gas channel, located in the circulation A multi-cavity heat absorbing device is arranged between the lower part of the water atomization and distribution device and the smoke outlet of the smoke diversion distribution device. 3. The flue gas waste heat recovery device according to claim 2, characterized in that the circulating water atomization and spreading device consists of a liquid phase distributor integrated on the water collecting head, a swirl scattering atomizer connected with the liquid phase distributor, The water supply diffuser connected with the cooling water supply pipe, the swirl pipe and the swirl interface flange located upstream of the liquid phase distributor, the water supply pipe and the water supply pipe interface flange located upstream of the water supply diffuser, and the corresponding sealing gaskets . 4. The flue gas waste heat recovery device according to claim 1, 2 or 3, characterized in that the antifouling condensation device and the multi-cavity heat absorbing device arranged in the gas channel are respectively detachable. 5. The flue gas waste heat recovery device according to claim 4, characterized in that the antifouling condensation device is composed of multi-layer stainless steel plates with warped surfaces. 6. The flue gas waste heat recovery device according to claim 5, characterized in that the multi-cavity heat absorbing device is made of stainless steel with irregular convex and concave shapes processed on the multi-layer surface, and there are several small through holes on it. Boards are stacked randomly.