A multi-stage device and method for recovering heat from furnace flue gases

Abstract

The application discloses a kind of multistage recovery furnace flue heat device and method, and the application relates to the technical field of recovering heat on furnace flue, it includes the baffle welded on the right end surface of exhaust pipe, water tank welded on the outer wall of the right end port of exhaust pipe, the inner wall of the exhaust pipe is welded with annular pipe located in the left side of baffle, multiple radial holes are formed on the inner cylindrical surface of annular pipe along its circumferential direction, multiple inner heating pipes are welded on the outer cylindrical surface of annular pipe along its circumferential direction, and the port of inner heating pipe is connected with the inner cavity of annular pipe;The left end surface of baffle is welded with hollow tube penetrating through the center hole of annular pipe to left, the cylindrical surface of hollow tube is welded with fixed plate located in the right side of annular pipe, hollow tube is sleeved with sliding plate, sliding plate is slidably connected with the center hole of annular pipe, and each radial hole is covered.This application has the beneficial effects that: it can heat tap water completely in a short time, and greatly improve the heat recovery efficiency on furnace flue.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of recovering heat from furnace flue gas, and particularly to a multi-stage device and method for recovering heat from furnace flue gas. BACKGROUND

[0002] A waste incinerator is used for incinerating domestic waste. In the process of incinerating domestic waste, not only slag is produced, but also furnace flue gas with heat is produced. Since the furnace flue gas has heat, in order to recover the heat from the furnace flue gas into tap water for daily use by workers, the workers install a heat recovery device as shown in Figure 1 the drawing on the exhaust pipe 1 to recover the heat into tap water. The heat recovery device includes a baffle 2 welded at the end of the exhaust pipe 1, a water tank 3 welded on the right end face of the baffle 2, a plurality of heat exchange pipes 14 welded on the baffle 2 and penetrating through the water tank 3 to the right, and an inlet valve 12 and an outlet valve 13 connected to the top and bottom of the water tank 3, respectively.

[0003] The method for recovering heat from the furnace flue gas by using the heat recovery device is as follows:

[0004] S1, open the inlet valve 12, inject a certain amount of tap water into the water tank 3 through the inlet valve 12, and close the inlet valve 12 after the injection is completed;

[0005] S2, when the waste incinerator is incinerating domestic waste, the furnace flue gas produced is sequentially discharged through the lower end of the exhaust pipe 1, the exhaust pipe 1, the right end of the exhaust pipe 1, the left end of the heat exchange pipe 14, the heat exchange pipe 14, and the right end of the heat exchange pipe 14, and finally into the first treatment process. When the furnace flue gas flows through the heat exchange pipe 14, the heat on the furnace flue gas is transferred to the inner wall of the heat exchange pipe 14, and the inner wall of the heat exchange pipe 14 further transfers the furnace flue gas to the tap water, thereby gradually heating the tap water. After a period of time, the tap water in the water tank 3 can be heated, thereby recovering part of the heat on the furnace flue gas into the tap water;

[0006] S3, the worker opens the outlet valve 13, and the hot water in the water tank 3 can flow out through the outlet valve 13, and the hot water flowing out can be used for daily life by the workers.

[0007] However, the heat recovery device being used in the workshop can recover the heat on the furnace flue gas, but there are still the following technical defects in the technology:

[0008] I. The flow speed of the furnace flue gas entering the exhaust pipe 1 is fast, and the furnace flue gas passes through the heat exchange pipe 14 quickly, so that the heat on the furnace flue gas is not timely transferred to the heat exchange pipe 14, and thus a long time is needed to completely heat the tap water in the water tank 3, thereby reducing the recovery efficiency of the heat on the furnace flue gas.

[0009] II, heat exchange pipe 14 is arranged inside water tank 3, thus only gradually heating tap water from inside to outside, the path of heat recovery is single, which causes long waiting time for completely heating tap water, which undoubtedly further reduces the heat recovery efficiency of flue gas. SUMMARY

[0010] The present application aims to overcome the shortcomings of the prior art, and provide a multi-stage flue gas heat recovery device and method for completely heating tap water in a short time and greatly improving the flue gas heat recovery efficiency.

[0011] The present application is achieved by the following technical scheme: a multi-stage flue gas heat recovery device, comprising a baffle welded to the right end face of the smoke exhaust pipe, a water tank welded to the outer wall of the right end port of the smoke exhaust pipe, an annular pipe welded to the left side of the baffle on the inner wall of the smoke exhaust pipe, a plurality of radial holes are formed on the inner cylindrical surface of the annular pipe along the circumferential direction thereof, each radial hole is in communication with the inner cavity of the annular pipe, a plurality of inner heating pipes are welded to the outer cylindrical surface of the annular pipe along the circumferential direction thereof, one end of each inner heating pipe is in communication with the inner cavity of the annular pipe, and the other end of the inner heating pipe sequentially penetrates the outer wall of the smoke exhaust pipe, the inner wall of the water tank and the right side wall of the water tank.

[0012] A hollow tube is welded to the left end face of the baffle and penetrates the center hole of the annular pipe to the left, a fixed plate is welded to the right side of the annular pipe on the cylindrical surface of the hollow tube, a sliding plate is sleeved on the hollow tube, the sliding plate is in sliding fit with the center hole of the annular pipe and covers each radial hole, a spring is also sleeved on the hollow tube, one end of the spring is fixed to the left end face of the fixed plate, and the other end is fixed to the right end face of the sliding plate; a plurality of outer heating pipes are welded to the right side of the fixed plate on the cylindrical surface of the hollow tube along the circumferential direction thereof, one end of each outer heating pipe is in communication with the inner cavity of the hollow tube, the other end of the outer heating pipe is welded to the inner wall of the smoke exhaust pipe, and the port thereof penetrates the baffle to the right.

[0013] The top and bottom of the water tank are respectively provided with a water inlet valve and a water outlet valve in communication with the inner cavity thereof.

[0014] The smoke exhaust pipe, the annular pipe, the hollow tube and the water tank are coaxially arranged.

[0015] The radial holes are uniformly distributed on the inner wall of the annular pipe.

[0016] The outer heating pipes are uniformly distributed on the hollow tube.

[0017] The top port of the water inlet valve is connected with a water pipe, and the other end of the water pipe is connected with a water pump.

[0018] The device further comprises a controller, which is electrically connected with the water inlet valve, the water outlet valve and the water pump through signal lines.

[0019] A method for recovering heat from multi-stage furnace flue gas, comprising the following steps:

[0020] S1, the water inlet valve is opened under the control of the controller, and then the water pump is started, the tap water in the water tank is pumped out, and the tap water is sequentially pumped into the water tank through the water pump, the pipeline and the water inlet valve, and when the pumping time is set, the water pump is controlled to be closed, and at this time, the tap water completely floods all the inner heating pipes;

[0021] S2, when the waste incinerator is burning household garbage, the flue gas generated by the waste incinerator enters the exhaust pipe through the lower end of the exhaust pipe, the flue gas A acts on the sliding plate to push the sliding plate to the right, the sliding plate moves to the right along the hollow pipe and compresses the spring to the right, when moving to the right for a distance, the sliding plate no longer blocks the radial hole of the annular pipe, the flue gas A sequentially passes through the radial hole of the annular pipe, the inner cavity of the annular pipe, one end of the inner heating pipe, and the inner heating pipe, and is finally discharged to the outside from the other end of the inner heating pipe, wherein when the flue gas A flows through the inner heating pipe, the flue gas A transfers heat to the inner wall of the inner heating pipe, and the heat on the inner heating pipe is transferred to the tap water, thereby realizing the gradual heating of the tap water in the water tank from the inside to the outside, that is, realizing the first-stage heating of the tap water;

[0022] At the same time, the other flue gas B enters the inner cavity of the hollow pipe, and then sequentially passes through one end of the outer heating pipe, the outer heating pipe and the other end of the outer heating pipe, and is finally discharged to the outside, wherein when the flue gas B flows through the outer heating pipe, the flue gas B transfers heat to the inner wall of the outer heating pipe, and the heat on the outer heating pipe is transferred to the inner wall of the water tank, and the inner wall of the water tank transfers heat to the tap water, thereby realizing the gradual heating of the tap water in the water tank from the outside to the inside, that is, realizing the second-stage heating of the tap water;

[0023] After a period of time, the tap water in the water tank can be completely heated, so that part of the heat on the flue gas is recovered into the tap water;

[0024] S3, the worker controls the water outlet valve to be opened, and the hot water in the water tank can flow out through the water outlet valve, and the flowing hot water can be used for daily life of the worker.

[0025] The present application has the following advantages: the tap water can be completely heated in a short time, and the heat recovery efficiency on the flue gas is greatly improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A structure diagram of the worker installing the heat recovery device on the exhaust pipe;

[0027] Figure 2 A structure diagram of the present application;

[0028] Figure 3 is a front view of the main profile schematic diagram of the application; Figure 2

[0029] Figure 4 is a right view of the application; Figure 3

[0030] Figure 5 is a structural schematic diagram of the slide plate;

[0031] Figure 6 is a schematic diagram of the connection of the annular pipe and the inner heating pipe;

[0032] Figure 7 is a schematic diagram of the right movement of the slide plate;

[0033] In the figure, 1 is a smoke exhaust pipe, 2 is a baffle, 3 is a water tank, 4 is an annular pipe, 5 is a radial hole, 6 is an inner heating pipe, 7 is a hollow pipe, 8 is a fixed plate, 9 is a slide plate, 10 is a spring, 11 is an outer heating pipe, 12 is a water inlet valve, 13 is a water outlet valve, and 14 is a heat exchange pipe. DETAILED DESCRIPTION

[0034] The application will be further described below in combination with the accompanying drawings, and the protection scope of the application is not limited to the following description:

[0035] As shown in Figures 2-6 , a multi-stage device for recycling the heat of flue gas, which comprises a baffle 2 welded on the right end face of a smoke exhaust pipe 1, a water tank 3 welded on the outer wall of the right end port of the smoke exhaust pipe 1, an annular pipe 4 welded on the inner wall of the smoke exhaust pipe 1 and located on the left side of the baffle 2, a plurality of radial holes 5 evenly distributed on the inner wall of the annular pipe 4 and arranged along the circumferential direction of the annular pipe 4, each radial hole 5 being in communication with the inner cavity of the annular pipe 4, and a plurality of inner heating pipes 6 welded on the outer cylindrical surface of the annular pipe 4 along the circumferential direction of the annular pipe 4, one end of each inner heating pipe 6 being in communication with the inner cavity of the annular pipe 4, and the other end of each inner heating pipe 6 sequentially penetrating through the outer wall of the smoke exhaust pipe 1, the inner wall of the water tank 3, and the right side wall of the water tank 3.

[0036] ​​The left end face of the baffle 2 is welded with a hollow tube 7 penetrating through the center hole of the annular tube 4 to the left, the smoke exhaust pipe 1, the annular tube 4, the hollow tube 7 and the water tank 3 are coaxially arranged, the cylindrical surface of the hollow tube 7 is welded with a fixed plate 8 located at the right side of the annular tube 4, the hollow tube 7 is sleeved with a sliding plate 9, the sliding plate 9 is in sliding fit with the center hole of the annular tube 4 and covers each radial hole 5, the hollow tube 7 is further sleeved with a spring 10, one end of the spring 10 is fixedly arranged on the left end face of the fixed plate 8 and the other end is fixedly arranged on the right end face of the sliding plate 9; a plurality of outer heating tubes 11 are welded on the cylindrical surface of the hollow tube 7 along the circumference thereof and located at the right side of the fixed plate 8, the outer heating tubes 11 are uniformly distributed on the hollow tube 7, one end of the outer heating tube 11 is in communication with the inner cavity of the hollow tube 7, the other end of the outer heating tube 11 is welded on the inner wall of the smoke exhaust pipe 1 and has a port penetrating through the baffle 2 to the right.

[0037] The top and bottom of the water tank 3 are respectively provided with a water inlet valve 12 and a water outlet valve 13 in communication with the inner cavities thereof. The top port of the water inlet valve 12 is connected with a water pipe, the other end of the water pipe is connected with a water pump. The device further comprises a controller, the controller is electrically connected with the water inlet valve 12, the water outlet valve 13 and the water pump through signal lines, the starting or closing of the water inlet valve 12 and the water outlet valve 13 can be controlled through the controller, and the starting or closing of the water pump can also be controlled, which facilitates the operation of workers.

[0038] A method for multi-stage recycling of furnace smoke heat, comprising the following steps:

[0039] S1, the water inlet valve 12 is opened through the controller, and then the water pump is started, the tap water in the water tank is pumped out, the pumped-out tap water sequentially passes through the water pump, the pipeline and the water inlet valve 12, and finally is pumped into the water tank 3, when the pumping time is set, the water pump is closed through the controller, at this time, the tap water completely floods all the inner heating tubes 6;

[0040] S2, when the waste incinerator is incinerating household garbage, the furnace smoke generated is introduced into the smoke exhaust pipe 1 through the lower port of the smoke exhaust pipe 1, one-way furnace smoke A acts on the sliding plate 9 to push the sliding plate 9 to the right, the sliding plate 9 moves to the right along the hollow tube 7 and compresses the spring 10 to the right, as shown in Figure 7 , when moving to the right for a distance, the sliding plate 9 no longer covers the radial holes 5 of the annular tube 4, the one-way furnace smoke A sequentially passes through the radial holes of the annular tube 4, the inner cavity of the annular tube 4, one port of the inner heating tube 6 and the inner heating tube 6, and finally is discharged to the outside from the other port of the inner heating tube 6, the movement direction of the furnace smoke A is shown by the solid arrow in Figure 7 , wherein, when the furnace smoke A flows through the inner heating tube 6, the furnace smoke A transmits heat to the inner wall of the inner heating tube 6, the heat on the inner heating tube 6 is transmitted to the tap water, thereby realizing the gradual heating of the tap water in the water tank 3 from the inside to the outside, that is, realizing the first-stage heating of the tap water;

[0041] Simultaneously, another stream of flue gas, B, enters the inner cavity of the hollow tube 7, then sequentially passes through one port of the external heating tube 11, the other port of the external heating tube 11, and finally is discharged to the outside. The direction of movement of flue gas B is as follows: Figure 7 As shown by the hollow arrow, when the flue gas B flows through the external heating pipe 11, the flue gas B transfers heat to the inner wall of the external heating pipe 11, and the heat on the external heating pipe 11 is then transferred to the inner wall of the water tank 3. The inner wall of the water tank 3 then transfers heat to the tap water, thus realizing the gradual heating of the tap water in the water tank 3 from the outside to the inside, that is, realizing the second stage of tap water heating.

[0042] After a period of time, all the tap water in water tank 3 can be heated, thereby recovering some of the heat from the flue gas into the tap water;

[0043] S3. When the worker controls the water outlet valve 13 to open, the hot water in the water tank 3 can flow out through the water outlet valve 13 and can be used by the worker for daily life.

[0044] In step S2, the inner heating pipe 6 gradually heats the tap water from the inside out, while the outer heating pipe 11 gradually heats the tap water from the outside in, achieving two-stage heating of the tap water. Compared to... Figure 1 The heat recovery device shown heats tap water via a single path, enabling the tap water to be thoroughly heated in a short time, thereby greatly improving the heat recovery efficiency of the flue gas.

[0045] Furthermore, in step S2, as the flue gas A pushes open the sliding plate 9 to the right, its flow rate is slowed down. As the flue gas A flows from the radial hole 5 into the inner cavity of the annular pipe 4, its flow rate is further slowed down. This ensures that the flue gas A passes through the inner heating pipe 6 at a low speed, ensuring that the heat from the flue gas A can be transferred to the tap water in a timely manner. Therefore, compared to other methods, this device... Figure 1 The heat recovery device shown can completely heat the tap water in the water tank 3 in a short time, thereby greatly improving the heat recovery efficiency of the flue gas.

[0046] Furthermore, as the flue gas B flows from the inner cavity of the hollow tube 7 into the external heating tube 11, its flow rate is slowed down. This ensures that the flue gas B passes through the external heating tube 11 at a low speed, guaranteeing that the heat from the flue gas B can be transferred to the tap water in a timely manner. Therefore, compared to other methods, this device... Figure 1 The heat recovery device shown can completely heat the tap water in the water tank 3 in a short time, thereby greatly improving the heat recovery efficiency of the flue gas.

[0047] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that the technical solutions described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalent ones. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for multi-stage recovery of flue gas heat, characterized in that: It includes the baffle (2) welded on the right end face of the smoke exhaust pipe (1), the water tank (3) welded on the outer wall of the right end port of the smoke exhaust pipe (1), the inner wall of the smoke exhaust pipe (1) is welded with the annular pipe (4) located on the left side of the baffle (2), a plurality of radial holes (5) are formed on the inner cylindrical surface of the annular pipe (4) along the circumferential direction thereof, each radial hole (5) is in communication with the inner cavity of the annular pipe (4), a plurality of inner heating pipes (6) are welded on the outer cylindrical surface of the annular pipe (4) along the circumferential direction thereof, one end of the inner heating pipe (6) is in communication with the inner cavity of the annular pipe (4), the other end of the inner heating pipe (6) penetrates the outer wall of the smoke exhaust pipe (1), the inner wall of the water tank (3) and the right side wall of the water tank (3) in sequence; The left end face of the baffle (2) is welded with the hollow tube (7) penetrating the center hole of the annular pipe (4) to the left, the cylindrical surface of the hollow tube (7) is welded with the fixed plate (8) located on the right side of the annular pipe (4), the hollow tube (7) is sleeved with the sliding plate (9), the sliding plate (9) is in sliding fit with the center hole of the annular pipe (4) and covers each radial hole (5), the hollow tube (7) is further sleeved with the spring (10), one end of the spring (10) is fixedly arranged on the left end face of the fixed plate (8), the other end is fixedly arranged on the right end face of the sliding plate (9); A plurality of outer heating pipes (11) are welded on the cylindrical surface of the hollow tube (7) along the circumferential direction thereof and located on the right side of the fixed plate (8), one end of the outer heating pipe (11) is in communication with the inner cavity of the hollow tube (7), the other end of the outer heating pipe (11) is welded on the inner wall of the smoke exhaust pipe (1) and has a port penetrating the baffle (2) to the right.

2. A multi-stage heat recovery device according to claim 1, wherein: The top and bottom of the water tank (3) are respectively provided with the water inlet valve (12) and the water outlet valve (13) in communication with the inner cavity thereof.

3. A multi-stage heat recovery device according to claim 2, wherein: The smoke exhaust pipe (1), the annular pipe (4), the hollow tube (7) and the water tank (3) are coaxially arranged.

4. A multi-stage heat recovery device according to claim 3, wherein: The radial holes (5) are uniformly distributed on the inner wall of the annular pipe (4).

5. A multi-stage heat recovery device according to claim 4, wherein: The outer heating pipes (11) are uniformly distributed on the hollow tube (7).

6. A multi-stage heat recovery device according to claim 5, wherein: The top port of the water inlet valve (12) is connected with a water pipe, and the other end of the water pipe is connected with a water pump.

7. A multi-stage heat recovery device according to claim 6, wherein: The device further comprises a controller, and the controller is electrically connected with the water inlet valve (12), the water outlet valve (13) and the water pump through signal lines.

8. A method for recovering heat from flue gas in multiple stages using the apparatus for recovering heat from flue gas in multiple stages according to claim 7, characterized by: It comprises the following steps: S1, open the water inlet valve (12) through the controller, then start the water pump, the water pump pumps out the tap water in the water tank, the pumped out tap water sequentially passes through the water pump, the pipeline and the water inlet valve (12), and finally is pumped into the water tank (3), when the pumping time is set, the controller controls the water pump to be closed, at this time the tap water will submerge all the inner heating pipes (6); S2, when the garbage incinerator is burning domestic waste, the flue gas generated by the incineration enters the exhaust pipe (1) through the lower end of the exhaust pipe (1), one way of flue gas A acts on the sliding plate (9) to push the sliding plate (9) to the right, the sliding plate (9) moves to the right along the hollow pipe (7) and compresses the spring (10) to the right, when moving a distance to the right, the sliding plate (9) no longer blocks the radial hole (5) of the annular pipe (4), the flue gas A passes through the radial hole of the annular pipe (4), the inner cavity of the annular pipe (4), one end of the inner heating pipe (6), the inner heating pipe (6) in turn, and finally discharged from the other end of the inner heating pipe (6) to the outside, wherein when the flue gas A flows through the inner heating pipe (6), the flue gas A transfers heat to the inner wall of the inner heating pipe (6), and the heat on the inner heating pipe (6) is transferred to the tap water, thereby gradually heating the tap water in the water tank (3) from the inside out, that is, realizing the first stage of heating the tap water; At the same time, another way of flue gas B enters the inner cavity of the hollow pipe (7), and then sequentially passes through one end of the outer heating pipe (11), the outer heating pipe (11), the other end of the outer heating pipe (11), and finally is discharged to the outside, wherein when the flue gas B flows through the outer heating pipe (11), the flue gas B transfers heat to the inner wall of the outer heating pipe (11), and the heat on the outer heating pipe (11) is transferred to the inner wall of the water tank (3), and the inner wall of the water tank (3) is transferred to the tap water, thereby gradually heating the tap water in the water tank (3) from the outside in, that is, realizing the second stage of heating the tap water; After a period of time, the tap water in the water tank (3) can be heated, and part of the heat on the flue gas is recovered into the tap water; S3, the worker controls the opening of the water outlet valve (13), and the hot water in the water tank (3) can flow out through the water outlet valve (13), and the flowing hot water can be used for daily life of workers.

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