CN221839740U - Boiler with heat recovery - Google Patents

Abstract

The utility model discloses a boiler with heat recovery, which belongs to the technical field of boilers. The main points of the technical solution include a bottom plate, a boiler body is arranged on the top surface of the bottom plate, a smoke exhaust pipe is arranged on the top of the boiler body, an air pump is arranged in the middle of the smoke exhaust pipe, a smoke heat recovery mechanism is arranged on the top surface of the middle part of the bottom plate, a smoke treatment mechanism matched with the smoke heat recovery mechanism is arranged on the side of the bottom plate away from the boiler body, when in use, the smoke generated during the operation of the boiler body is discharged into the smoke exhaust pipe, the air pump pressurizes and transports the smoke in the liquid discharge pipe, the heat conduction area of the smoke can be increased through the smoke heat recovery mechanism, the circulation speed of the smoke can be slowed down, the heat conduction efficiency of the smoke to the heat conduction pipe is improved, the heat in the smoke can be efficiently recovered and utilized, the smoke after heat recovery can be fully contacted with the treatment liquid through the smoke treatment mechanism, and the smoke can be purified and cooled.

Description

A boiler with heat recovery

Technical Field

The utility model relates to the technical field of boilers, in particular to a boiler with heat recovery.

Background Art

A boiler is an energy conversion device. The energy input into the boiler includes chemical energy and electrical energy in the fuel. The boiler outputs steam, high-temperature water or organic heat carrier with a certain amount of thermal energy. The basic working principle of the boiler is to generate heat energy by burning fuel, and then transfer this heat energy to water or other working fluids in the boiler. In traditional boilers, common fuels include coal, natural gas, oil, etc.

When the boiler is in use, a large amount of waste gas with heat will be generated. If the waste gas is discharged directly, on the one hand, it is easy to cause environmental pollution. On the other hand, the direct discharge of the heat in the waste gas will lead to a waste of resources. Therefore, it is necessary to recover the waste heat of the boiler.

The current Chinese utility model patent with the announcement number: CN219869233U discloses a boiler exhaust gas heat recovery structure. The beneficial effect of this utility model is: when the sieve plate needs to be cleaned, by rotating the output end of the motor, it is convenient to rotate the rotating rod, facilitate the rotation of the scraper, facilitate the scraper to clean the sieve plate, and facilitate the scraping of impurities at the bottom of the sieve plate, which can avoid clogging of the sieve holes, affecting the circulation of gas, thereby avoiding affecting the effect of exhaust gas treatment.

In view of the above problems, existing patents have provided solutions, but there is a problem of low efficiency in heat recovery from flue gas, which cannot efficiently recycle the heat in the flue gas, and cannot cool and purify the flue gas before discharge.

To this end, a boiler with heat recovery is proposed.

Utility Model Content

The utility model provides a boiler with heat recovery, aiming to solve the problem that the existing boiler flue gas heat recovery structure has low flue gas heat recovery efficiency, cannot efficiently recycle the heat in the flue gas, and cannot purify the flue gas before discharging.

The utility model is implemented as follows: a boiler with heat recovery comprises a bottom plate, a boiler body is arranged on the top surface of the bottom plate, a smoke exhaust pipe is arranged on the top of the boiler body, an air pump is arranged in the middle of the smoke exhaust pipe, a smoke heat recovery mechanism is arranged on the top surface of the middle part of the bottom plate, and a smoke treatment mechanism matched with the smoke heat recovery mechanism is arranged on the side of the bottom plate away from the boiler body;

The flue gas heat recovery mechanism includes a recovery tank, a hollow disk, a heat conducting pipe, a spiral blade, a smoke outlet pipe, a motor 1, a rotating shaft, a stirring blade, a liquid inlet pipe and a liquid outlet pipe. The recovery tank is fixedly connected to the top surface of the bottom plate toward the middle, and the two hollow disks are respectively fixedly connected to the inner walls at both ends of the recovery tank. The bottom of the smoke exhaust pipe is through-coordinated with the hollow disk close to it, and a plurality of the heat conducting pipes are fixedly connected to the side walls of the two hollow disks and through-coordinated with the hollow disks. The spiral blades are fixedly connected to the inner wall of the heat conducting pipe, and the smoke outlet pipe is through-connected to the side wall of the hollow disk away from one end of the smoke exhaust pipe and the two are through-coordinated. The motor 1 is bolted to the side wall of the recovery tank, the rotating shaft is fixedly connected to the output end of the motor 1 and is connected to the recovery tank bearing, and a plurality of the stirring blades are fixedly connected to the side wall of the rotating shaft. The liquid inlet pipe is through-coordinated at the top of the recovery tank, and the liquid outlet pipe is through-coordinated at the bottom of the recovery tank.

In order to achieve the effect of cooling and purifying the flue gas, as a preferred boiler with heat recovery of the utility model, the flue gas treatment mechanism includes a treatment cylinder, a top cover, an air outlet plate, an air outlet hole, a second motor, a stirring shaft, a scraper one, a dispersion leaf, a drain pipe and a liquid adding pipe, the treatment cylinder is fixedly connected to the top surface of the bottom plate, the top cover is threadedly connected to the top of the treatment cylinder and the middle part is hollow, the air outlet plate is through-set at the bottom of the smoke outlet pipe, the smoke outlet pipe is through-matched with the treatment cylinder, a plurality of the air outlet holes are opened on the top surface of the air outlet plate, the second motor is bolted to the bottom surface of the treatment cylinder, the stirring shaft bearing is connected to the middle part of the treatment cylinder and fixedly connected to the output end of the second motor, the scraper one is fixedly connected to the side wall of the stirring shaft and its side wall contacts the top surface of the air outlet plate, a plurality of the dispersion leaves are fixedly connected to the side wall of the stirring shaft, the drain pipe is through-set at the top of the treatment cylinder, and the liquid adding pipe is set on the side wall of the top of the treatment cylinder.

In order to achieve the effect of filtering the purified flue gas again, as a preferred boiler with heat recovery of the utility model, a placement seat is fixedly connected to the inner wall of the treatment cylinder, a filter screen is arranged on the side wall of the placement seat, and a pressure ring is fixedly connected to the top surface of the top cover, and the side wall of the pressure ring is in contact with the placement seat and the filter screen.

In order to clean the filter and prevent it from being blocked, as a preferred boiler with heat recovery of the utility model, a plurality of scrapers 2 are fixedly connected to the top of the stirring shaft, and the side walls of the scrapers 2 are in contact with the filter.

In order to discharge the liquid entering the gas outlet plate, as a preferred boiler with heat recovery of the utility model, a connecting pipe is provided through the bottom of the gas outlet plate, and the other end of the connecting pipe is connected to the drain pipe.

In order to increase the contact area between the heat pipe and the liquid and improve the heat conduction effect on the flue gas, as a preferred boiler with heat recovery of the utility model, a plurality of heat conduction rings are fixedly connected to the side wall of the heat pipe, and the plurality of heat conduction rings are arranged at equal intervals.

In order to make the recovery tank have a heat-insulating effect, as a preferred boiler with heat recovery of the utility model, the side wall of the recovery tank is provided with a heat-insulating cavity, and the interior of the heat-insulating cavity is provided with heat-insulating cotton.

In order to allow a gap to exist between the gas outlet plate and the treatment tube so that the liquid can circulate at the bottom of the gas outlet plate, as a preferred boiler with heat recovery of the utility model, a plurality of pads are fixedly connected to the bottom surface of the treatment tube, and the top surfaces of the pads are fixedly connected to the gas outlet plate.

Compared with the prior art, the beneficial effects of the utility model are:

The utility model provides a flue gas heat recovery mechanism, which can increase the heat conduction area of the flue gas, slow down the circulation speed of the flue gas, improve the heat conduction efficiency of the flue gas to the heat conduction pipe, and efficiently recover the heat in the flue gas, thereby effectively solving the problem of low efficiency of heat recovery of the flue gas and the problem of not being able to efficiently recover the heat in the flue gas in the prior art.

The utility model provides a flue gas treatment mechanism, which can make the flue gas fully contact with the treatment liquid when the flue gas is discharged, and can purify and cool the flue gas, thereby effectively solving the problem in the prior art that the flue gas cannot be discharged after cooling and purification.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is an overall structural diagram of the utility model;

Fig. 2 is a left view of the utility model;

Fig. 3 is a three-dimensional cross-sectional view of the A-A position in Fig. 2 of the present invention;

FIG4 is a schematic diagram of a flue gas heat recovery mechanism of the present invention;

FIG. 5 is a schematic diagram of a smoke treatment mechanism of the present invention.

Description of the numbers in the figure:

1. Bottom plate; 2. Boiler body; 3. Smoke exhaust pipe; 4. Air pump; 5. Smoke heat recovery mechanism; 6. Smoke treatment mechanism; 501. Recovery tank; 502. Hollow plate; 503. Heat transfer pipe; 504. Spiral blade; 505. Smoke outlet pipe; 506. Motor 1; 507. Rotating shaft; 508. Stirring blade; 509. Liquid inlet pipe; 510. Liquid outlet pipe; 601. Treatment cylinder; 602. Top cover; 603. Gas outlet plate; 604. Gas outlet hole; 605. Motor 2; 606. Stirring shaft; 607. Scraper 1; 608. Dispersing blade; 609. Liquid outlet pipe; 610. Liquid adding pipe; 71. Placement seat; 72. Filter screen; 73. Pressing ring; 81. Scraper 2; 91. Connecting pipe; 100. Heat transfer ring; 111. Insulation chamber; 112. Pad.

Implementation

In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

Please refer to Figures 1 to 5. The utility model provides a technical solution: a boiler with heat recovery, comprising a bottom plate 1, a boiler body is arranged on the top surface of the bottom plate 1, a smoke exhaust pipe 3 is arranged on the top of the boiler body 2, an air pump 4 is arranged in the middle of the smoke exhaust pipe 3, a flue gas heat recovery mechanism 5 is arranged on the top surface of the middle of the bottom plate 1, and a flue gas treatment mechanism 6 matched with the flue gas heat recovery mechanism 5 is arranged on the side of the bottom plate 1 away from the boiler body 2;

The flue gas heat recovery mechanism 5 includes a recovery tank 501, a hollow plate 502, a heat pipe 503, a spiral blade 504, a smoke outlet pipe 505, a motor 506, a rotating shaft 507, a stirring blade 508, a liquid inlet pipe 509 and a liquid outlet pipe 510. The recovery tank 501 is fixedly connected to the top surface of the bottom plate 1 toward the middle, and the two hollow plates 502 are respectively fixedly connected to the inner walls of the two ends of the recovery tank 501. The bottom of the smoke exhaust pipe 3 is connected with the hollow plate 502 close to it. A plurality of heat pipes 503 are fixedly connected to the side walls of the two hollow plates 502 and are connected to the hollow plates 5 02 through-fit, the spiral blade 504 is fixedly connected to the inner wall of the heat conduction pipe 503, the smoke outlet pipe 505 is through-connected to the side wall of the hollow disk 502 away from one end of the smoke exhaust pipe 3 and the two are through-fitted, the motor 506 is bolted to the side wall of the recovery tank 501, the rotating shaft 507 is fixedly connected to the output end of the motor 506 and is connected to the bearing of the recovery tank 501, a plurality of stirring blades 508 are fixedly connected to the side wall of the rotating shaft 507, the liquid inlet pipe 509 is through-set at the top of the recovery tank 501, and the liquid outlet pipe 510 is through-set at the bottom of the recovery tank 501.

In this embodiment: by setting the bottom plate 1, the boiler body 2, the smoke exhaust pipe 3, the air pump 4, the smoke heat recovery mechanism 5 and the smoke treatment mechanism 6, when in use, the smoke generated during the operation of the boiler body 2 is discharged into the smoke exhaust pipe 3, and the air pump 4 pressurizes and transports the smoke in the liquid discharge pipe 609. The smoke heat recovery mechanism 5 can increase the heat conduction area of the smoke, slow down the flow rate of the smoke, improve the heat conduction efficiency of the smoke to the heat conduction pipe 503, and efficiently recycle the heat in the smoke. Through the smoke treatment mechanism 6, the smoke after heat recovery can be fully contacted with the treatment liquid, and the smoke can be purified and cooled; by setting the recovery tank 501, the hollow disk 502, the heat conduction pipe 503, the spiral blade 504, the smoke outlet pipe 505, the motor 1 506, the shaft 507, the stirring blade 508, The liquid inlet pipe 509 and the liquid outlet pipe 510 are used to inject and discharge heat exchange liquid into the recovery tank 501 respectively. The flue gas in the smoke exhaust pipe 3 is transported by the air pump 4 into the hollow disk 502, and then enters the multiple heat conduction pipes 503. The heat conduction pipes 503 are heated by the flue gas through heat transfer. The spiral blades 504 can slow down the flow rate of the flue gas in the heat conduction pipes 503. After the heat conduction pipes 503 are heated, the heat is transferred to the heat exchange liquid. The starter motor 506 drives the rotating shaft 507 to rotate, and the stirring blades 508 stir the heat exchange liquid so that the heat exchange liquid can be evenly heated. In this way, the heat conduction area of the flue gas can be increased, the flow rate of the flue gas can be slowed down, the heat conduction efficiency of the flue gas to the heat conduction pipes 503 is improved, and the heat in the flue gas can be efficiently recovered and utilized.

As a technical optimization solution of the utility model, the flue gas treatment mechanism 6 includes a treatment cylinder 601, a top cover 602, an air outlet plate 603, an air outlet hole 604, a second motor 605, a stirring shaft 606, a scraper 1 607, a dispersion blade 608, a drain pipe 609 and a liquid adding pipe 610. The treatment cylinder 601 is fixedly connected to the top surface of the bottom plate 1, the top cover 602 is threadedly connected to the top of the treatment cylinder 601 and the middle part is hollow, the air outlet plate 603 is through-set at the bottom of the smoke outlet pipe 505, and the smoke outlet pipe 505 is through-matched with the treatment cylinder 601, and multiple The air outlet 604 is opened on the top surface of the air outlet plate 603, the motor 2 605 is bolted to the bottom surface of the processing cylinder 601, the stirring shaft 606 bearing is connected to the middle part of the processing cylinder 601 and is fixedly connected to the output end of the motor 2 605, the scraper 1 607 is fixedly connected to the side wall of the stirring shaft 606 and its side wall is in contact with the top surface of the air outlet plate 603, a plurality of dispersion leaves 608 are fixedly connected to the side wall of the stirring shaft 606, the drain pipe 609 is set through the top of the processing cylinder 601, and the liquid adding pipe 610 is set on the side wall of the top of the processing cylinder 601.

In this embodiment: by arranging a treatment cylinder 601, a top cover 602, an air outlet disk 603, an air outlet hole 604, a second motor 605, a stirring shaft 606, a scraper 1 607, a dispersion leaf 608, a drain pipe 609 and a liquid adding pipe 610, when in use, the treatment liquid can be added to and discharged from the interior of the treatment cylinder 601 through the liquid adding pipe 610 and the drain pipe 609, and the flue gas enters the air outlet disk 603 through the smoke outlet pipe 505 after heat recovery, and is dispersed into the treatment liquid through multiple air outlet holes 604, and the power supply is connected to start the second motor 605 to drive the stirring shaft 606 to rotate, and at this time, the scraper 1 607 scrapes the air outlet hole 604 to prevent the air outlet hole 604 from being blocked, and the dispersion leaf 608 breaks up the flue gas bubbles to form small micro bubbles, thereby increasing the contact area between the flue gas and the treatment liquid, so that the flue gas can be purified and cooled.

As a technical optimization solution of the utility model, a placement seat 71 is fixedly connected to the inner wall of the processing cylinder 601, a filter screen 72 is arranged on the side wall of the placement seat 71, and a pressure ring 73 is fixedly connected to the top surface of the top cover 602, and the side wall of the pressure ring 73 is in contact with the placement seat 71 and the filter screen 72.

In this embodiment: by providing a placement seat 71, a filter screen 72 and a pressure ring 73, when in use, the placement seat 71 supports the filter screen 72, and the pressure ring 73 presses and limits the filter screen 72, and the smoke is cooled and purified and then moves to the filter screen 72, and the filter screen 72 filters it again.

As a technical optimization solution of the present invention, a plurality of scrapers 81 are fixedly connected to the top of the stirring shaft 606 , and the side walls of the scrapers 81 are in contact with the filter screen 72 .

In this embodiment, a second scraper 81 is provided, and the second scraper 81 moves along with the stirring shaft 606 to clean the filter screen 72 , thereby preventing the filter screen 72 from being blocked.

As a technical optimization solution of the utility model, a connecting pipe 91 is provided through the bottom of the gas outlet plate 603 , and the other end of the connecting pipe 91 is in cooperation with the drain pipe 609 .

In this embodiment, by providing a connecting pipe 91 , the liquid entering the gas outlet plate 603 can be discharged through the connecting pipe 91 .

As a technical optimization solution of the present invention, a plurality of heat-conducting rings 100 are fixedly connected to the side wall of the heat-conducting pipe 503 , and the plurality of heat-conducting rings 100 are arranged at equal intervals.

In this embodiment, by providing the heat-conducting ring 100 , the contact area between the heat-conducting pipe 503 and the liquid can be increased, thereby improving the heat-conducting effect on the flue gas.

As a technical optimization solution of the present invention, a heat preservation chamber 111 is provided on the side wall of the recovery tank 501, and heat preservation cotton is provided inside the heat preservation chamber 111.

In this embodiment, the heat preservation chamber 111 and the heat preservation cotton are provided so that the recovery tank 501 has a heat preservation effect.

As a technical optimization solution of the present invention, a plurality of cushion blocks 112 are fixedly connected to the bottom surface of the processing cylinder 601 , and the top surface of the cushion block 112 is fixedly connected to the gas outlet plate 603 .

In this embodiment: heat exchange liquid is injected into and discharged from the recovery tank 501 through the liquid inlet pipe 509 and the liquid outlet pipe 510 respectively, and by providing the pad 112, a gap can be created between the gas outlet plate 603 and the treatment cylinder 601, so that liquid can flow at the bottom of the gas outlet plate 603.

Working principle: First, heat exchange liquid is injected into and discharged from the recovery tank 501 through the liquid inlet pipe 509 and the liquid outlet pipe 510 respectively, and the treatment liquid can be added to and discharged from the treatment tube 601 through the liquid filling pipe 610 and the liquid discharge pipe 609. The flue gas generated during the operation of the boiler body 2 is discharged into the flue gas exhaust pipe 3, and the air pump 4 pressurizes and transports the flue gas in the liquid discharge pipe 609. The flue gas in the flue gas exhaust pipe 3 enters the hollow disk 502 through the transportation of the air pump 4, and then enters multiple heat conduction pipes 503. The heat conduction pipe 503 is heated by the flue gas through heat transfer, and the spiral blade 504 can slow down the circulation speed of the flue gas in the heat conduction pipe 503. After the heat conduction pipe 503 is heated, the heat is transferred to the heat exchange liquid, and the motor 506 is started to drive the rotating shaft 507 to rotate, and the stirring blade 508 stirs the heat exchange liquid so that the heat exchange liquid can be evenly heated. In this way, energy is achieved. It can increase the heat conduction area of the flue gas, slow down the circulation speed of the flue gas, improve the heat conduction efficiency of the flue gas to the heat conduction pipe 503, and efficiently recycle the heat in the flue gas. After the heat is recovered, the flue gas enters the gas outlet plate 603 through the smoke outlet pipe 505, and is dispersed into the treatment liquid through multiple gas outlet holes 604. The power supply is connected to start the motor 2 605 to drive the stirring shaft 606 to rotate. At this time, the scraper 1 607 scrapes the gas outlet hole 604 to prevent the gas outlet hole 604 from being blocked. The dispersion leaves 608 break up the flue gas bubbles to form small micro bubbles, thereby increasing the contact area between the flue gas and the treatment liquid. In this way, the flue gas can be purified and cooled. After being cooled and purified, the flue gas moves to the filter screen 72, and the filter screen 72 filters it again. The scraper 2 81 follows the movement of the stirring shaft 606 to clean the filter screen 72 to prevent the filter screen 72 from being blocked.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A boiler with heat recovery, comprising a bottom plate (1), characterized in that: a boiler body (2) is arranged on the top surface of the bottom plate (1), a smoke exhaust pipe (3) is arranged on the top of the boiler body (2), an air pump (4) is arranged in the middle of the smoke exhaust pipe (3), a flue gas heat recovery mechanism (5) is arranged on the top surface of the middle of the bottom plate (1), and a flue gas treatment mechanism (6) matched with the flue gas heat recovery mechanism (5) is arranged on the side of the bottom plate (1) away from the boiler body (2); The flue gas heat recovery mechanism (5) comprises a recovery tank (501), a hollow disk (502), a heat conducting pipe (503), a spiral blade (504), a smoke outlet pipe (505), a motor (506), a rotating shaft (507), a stirring blade (508), a liquid inlet pipe (509) and a liquid outlet pipe (510); the recovery tank (501) is fixedly connected to the top surface of the bottom plate (1) toward the middle; the two hollow disks (502) are respectively fixedly connected to the inner walls at both ends of the recovery tank (501); the bottom of the smoke exhaust pipe (3) is connected to the hollow disk (502) adjacent thereto; the plurality of heat conducting pipes (503) are fixedly connected to the side walls of the two hollow disks (502) and are connected to the hollow disks (510); The spiral blades (504) are fixedly connected to the inner wall of the heat conducting pipe (503), the smoke outlet pipe (505) is connected to the side wall of the hollow disk (502) away from one end of the smoke exhaust pipe (3) and the two are connected to each other, the motor 1 (506) is bolted to the side wall of the recovery tank (501), the rotating shaft (507) is fixedly connected to the output end of the motor 1 (506) and connected to the bearing of the recovery tank (501), a plurality of stirring blades (508) are fixedly connected to the side wall of the rotating shaft (507), the liquid inlet pipe (509) is set through the top of the recovery tank (501), and the liquid outlet pipe (510) is set through the bottom of the recovery tank (501). 2. A boiler with heat recovery according to claim 1, characterized in that: the flue gas treatment mechanism (6) comprises a treatment cylinder (601), a top cover (602), an air outlet plate (603), an air outlet hole (604), a second motor (605), a stirring shaft (606), a scraper (607), a dispersion blade (608), a liquid discharge pipe (609) and a liquid addition pipe (610), the treatment cylinder (601) is fixedly connected to the top surface of the bottom plate (1), the top cover (602) is threadedly connected to the top of the treatment cylinder (601) and the middle part is hollow, the air outlet plate (603) is through-set at the bottom of the smoke outlet pipe (505), the smoke outlet pipe (505) and the treatment cylinder (601) are connected to each other. 1) Through-fitting, a plurality of the air outlet holes (604) are provided on the top surface of the air outlet plate (603), the second motor (605) is bolted to the bottom surface of the treatment cylinder (601), the bearing of the stirring shaft (606) is connected to the middle part of the treatment cylinder (601) and is fixedly connected to the output end of the second motor (605), the first scraper (607) is fixedly connected to the side wall of the stirring shaft (606) and its side wall is in contact with the top surface of the air outlet plate (603), a plurality of the dispersion blades (608) are fixedly connected to the side wall of the stirring shaft (606), the drain pipe (609) is through-set at the top of the treatment cylinder (601), and the liquid adding pipe (610) is set on the side wall at the top of the treatment cylinder (601). 3. A boiler with heat recovery according to claim 2, characterized in that: a placement seat (71) is fixedly connected to the inner wall of the treatment cylinder (601), a filter screen (72) is arranged on the side wall of the placement seat (71), and a pressure ring (73) is fixedly connected to the top surface of the top cover (602), and the side wall of the pressure ring (73) is in contact with the placement seat (71) and the filter screen (72). 4. A boiler with heat recovery according to claim 2, characterized in that: a plurality of scrapers (81) are fixedly connected to the top of the stirring shaft (606), and the side walls of the scrapers (81) are in contact with the filter screen (72). 5. A boiler with heat recovery according to claim 2, characterized in that: a connecting pipe (91) is provided through the bottom of the gas outlet plate (603), and the other end of the connecting pipe (91) is connected and matched with the drain pipe (609). 6. A boiler with heat recovery according to claim 1, characterized in that: a plurality of heat-conducting rings (100) are fixedly connected to the side wall of the heat-conducting pipe (503), and the plurality of heat-conducting rings (100) are arranged at equal intervals. 7. A boiler with heat recovery according to claim 1, characterized in that: a side wall of the recovery tank (501) is provided with a heat preservation cavity (111), and heat preservation cotton is provided inside the heat preservation cavity (111). 8. A boiler with heat recovery according to claim 2, characterized in that: a plurality of pads (112) are fixedly connected to the bottom surface of the treatment cylinder (601), and the top surface of the pads (112) is fixedly connected to the air outlet plate (603).