CN212272365U - Waste heat recovery device for engine - Google Patents

Abstract

The application discloses a waste heat recovery device for engine belongs to waste heat recovery technical field. This waste heat recovery device includes: the waste heat recovery device comprises a waste heat recovery main body, a safety valve, a temperature sensor, a cooling circulating water tank, a liquid level sensor and a relay. This application is through setting up the main separator between the outer box and the interior box at the waste heat recovery main part, has the liquid circulation passageway that is formed by first liquid passage, second liquid passage and third liquid passage in making the waste heat recovery main part, compares in original waste heat recovery main part, has prolonged the length of liquid circulation passageway, and it is long when the liquid that has prolonged the same volume stays in the waste heat recovery main part, can improve heat exchange efficiency, has higher economic benefits.

Description

Waste heat recovery device for engine

The present application claims priority from chinese patent application No. 201920979200.4 entitled "waste heat recovery device for engine" filed on 26.06.2019, the entire contents of which are incorporated herein by reference.

Technical Field

The application relates to the technical field of waste heat recovery, in particular to a waste heat recovery device for an engine.

Background

The engine generates a large amount of heat during operation, and if the heat is directly discharged, the energy is greatly wasted, so that a waste heat recovery device is required to be arranged at an exhaust port of the engine.

The current waste heat recovery device generally includes: the waste heat recovery main body is communicated with an exhaust port of the engine and performs waste heat recovery in a cold water heat exchange mode.

However, the waste heat recovery main body in the waste heat recovery device has low efficiency of recovering waste heat, and has low economic benefit.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a waste heat recovery device for an engine, and the problem can be solved.

The technical scheme is as follows:

provided is a waste heat recovery device for an engine, including: the waste heat recovery system comprises a waste heat recovery main body, a safety valve, a temperature sensor, an electromagnetic valve, a pressure sensor, a cooling circulating water tank, a liquid level sensor arranged on the cooling circulating water tank and a relay electrically coupled with an engine;

this waste heat recovery main part includes: the liquid container comprises an outer box body and an inner box body positioned in the outer box body, wherein a first liquid channel, a second liquid channel and a third liquid channel are formed between the outer box body and the inner box body;

the outer box body is provided with a liquid inlet and a liquid outlet pipeline, and the liquid inlet is communicated with a liquid outlet of the cooling circulation water tank;

a main partition board is arranged between the outer box body and the inner box body, so that liquid flowing into the waste heat recovery main body from the liquid inlet flows out of the waste heat recovery main body through the first liquid channel, the second liquid channel and the third liquid channel;

the safety valve, the temperature sensor, the electromagnetic valve and the pressure sensor are all arranged on the outer box body;

the inner box body is provided with an air inlet and an air outlet, the air inlet and the air outlet both extend to the outside of the outer box body, and the air inlet is used for being communicated with the air outlet of the engine.

In one possible design, a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the inner box body along the gas flow direction, so that the inner box body is divided into a first chamber, a second chamber, a third chamber and a fourth chamber;

this waste heat recovery main part still includes: a first pipe, a second pipe, a third pipe and a fourth pipe;

the first pipeline is communicated between the first chamber and the third chamber;

the second pipeline is communicated between the second chamber and the fourth chamber;

the third pipeline is communicated between the second chamber and the exhaust port of the inner box body;

the fourth pipeline is communicated between the third chamber and the fourth chamber.

In one possible design, the first duct and the fourth duct are located in the same horizontal plane.

In one possible design, the third pipe and the second pipe are arranged in sequence from bottom to top.

In one possible design, the air inlet of the inner box extends to the outside of the liquid inlet of the outer box.

In one possible design, the air inlet of the inner box extends to the outside of the liquid outlet pipe of the outer box.

In one possible design, a secondary waste heat recovery cavity is arranged between the waste heat recovery main body and the cooling circulating water tank;

this second grade waste heat recovery chamber includes: the secondary exhaust pipeline is positioned in the outer cavity;

the first end of the secondary exhaust pipeline is connected with the exhaust port of the inner box body, and the second end of the secondary exhaust pipeline extends to the outside of the secondary waste heat recovery cavity.

In one possible design, a water suction pump is arranged in the secondary waste heat recovery cavity.

In one possible design, the safety valve is a mechanical safety valve.

In one possible design, the outer box and the inner box are made of boiler steel.

This application is through setting up the main separator between the outer box and the interior box at the waste heat recovery main part, has the liquid circulation passageway that is formed by first liquid passage, second liquid passage and third liquid passage in making the waste heat recovery main part, compares in original waste heat recovery main part, has prolonged the length of liquid circulation passageway, and it is long when the liquid that has prolonged the same volume stays in the waste heat recovery main part, can improve heat exchange efficiency, has higher economic benefits.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a waste heat recovery device for an engine according to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a waste heat recovery body provided in an embodiment of the present application;

fig. 3 is a schematic diagram of an equivalent circuit between a relay and an engine provided in an embodiment of the present application.

Wherein the various reference numbers in the drawings are described below:

1-a waste heat recovery main body;

11-outer box, 11 a-outlet pipeline, 11 b-inlet, 11 c-main baffle;

12-inner box, 12 a-air inlet, 12B-air outlet, 121-first partition board, 122-second partition board, 123-third partition board, A-first chamber, B-second chamber, C-third chamber, D-fourth chamber;

13-a first liquid channel;

14-a second liquid channel;

15-a third liquid channel;

2-safety valve;

3-a temperature sensor;

4-cooling the circulating water tank;

5-a liquid level sensor;

6-a controller;

7-a relay;

71-switch, 72-moving contact, 73-normally closed contact, 74-iron core, 75-coil, 76-armature, 77-normally open contact, 78-spring;

8-a wireless signal transmission module;

91-first conduit, 92-second conduit, 93-third conduit, 94-fourth conduit;

10-a secondary waste heat recovery cavity;

10 a-an outer cavity, 10 b-a secondary exhaust duct;

m-engine.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the present application provides a waste heat recovery device for an engine, as shown in fig. 1, the waste heat recovery device includes: the waste heat recovery system comprises a waste heat recovery main body 1, a safety valve 2, a temperature sensor 3, an electromagnetic valve, a pressure sensor, a cooling circulating water tank 4, an engine M, a liquid level sensor 5 arranged on the cooling circulating water tank 4, and a relay 7 electrically coupled with the engine M; this waste heat recovery main part 1 includes: an outer box body 11, an inner box body 12 positioned in the outer box body 11, and a first liquid channel 13, a second liquid channel 14 and a third liquid channel 15 are formed between the outer box body 11 and the inner box body 12; the outer box body 11 is provided with a liquid inlet 11b and a liquid outlet pipeline 11a, and the liquid inlet 11b is communicated with a liquid outlet of the cooling circulation water tank 4; a main partition 11c is arranged between the outer box 11 and the inner box 12, so that the liquid flowing into the waste heat recovery main body 1 from the liquid inlet 11b flows out of the waste heat recovery main body 1 through the first liquid passage 13, the second liquid passage 14 and the third liquid passage 15; the safety valve 2, the temperature sensor 3, the electromagnetic valve and the pressure sensor are all arranged on the outer box body 11; the inner casing 12 has an inlet 12a and an outlet 12b, the inlet 12a and the outlet 12b both extend to the outside of the outer casing 11, and the inlet 12a is used for communicating with an outlet of the engine M.

The following describes the operation principle of the waste heat recovery device provided in the embodiment of the present application:

during the operation of the device, high-temperature gas from the engine M flows into the inner case 12 through the inlet port 12a, and this high-temperature gas is cooled in the inner case 12 and then flows out through the outlet port 12 b. Outside the inner case 12 is a liquid flow passage formed by a first liquid passage 13, a second liquid passage 14, and a third liquid passage 15, and a flowing liquid for exchanging heat with the high-temperature gas inside the inner case 12 is contained in the liquid flow passage.

The main partition board 11c connected between the outer box body 11 and the inner box body 12 is connected in a welding mode, so that a gap between a liquid inlet 11b of the outer box body 11 and a liquid outlet pipeline 11a of the outer box body 11 can be avoided, and further, condensed water can be prevented from directly flowing out without passing through an annular cavity between the outer box body 11 and the inner box body 12; the air inlet 12a of the inner box 12 is connected with the liquid inlet 11b of the outer box 11 in a welding mode, so that a gap between the air inlet 12a of the inner box 12 and the liquid inlet 11b of the outer box 11 can be avoided.

This application is through setting up main baffle 11c between outer box 11 and the interior box 12 at waste heat recovery main part 1, the liquid circulation passageway that has in making waste heat recovery main part 1 and is formed by first liquid passage 13, second liquid passage 14 and third liquid passage 15, compare in original waste heat recovery main part, the length of liquid circulation passageway has been prolonged, it is long when the stay of the liquid of the same volume in waste heat recovery main part 1 has been prolonged, can improve heat exchange efficiency, higher economic benefits has.

In order to further improve the heat exchange effect between the condensed water and the high-temperature gas, in one possible design, as shown in fig. 2, a first partition plate 121, a second partition plate 122, and a third partition plate 123 are sequentially disposed inside the inner box 12 along the gas flowing direction, so that the inner box 12 is divided into a first chamber a, a second chamber B, a third chamber C, and a fourth chamber D; this waste heat recovery main part 1 still includes: a first duct 91, a second duct 92, a third duct 93, and a fourth duct 94; the first conduit 91 is communicated between the first chamber a and the third chamber C; the second conduit 92 communicates between the second chamber B and the fourth chamber D; the third duct 93 is communicated between the second chamber B and the exhaust port 12B of the inner case 12; the fourth conduit 94 communicates between the third chamber C and the fourth chamber D.

With the arrangement, when the high-temperature gas (700-800 ℃) in the engine M flows out through the exhaust port of the engine M, the high-temperature gas firstly enters the first chamber a of the inner box 12, flows into the third chamber C through the first pipeline 91, fills the third chamber C, and then flows into the fourth chamber D. Then, the high-temperature gas flows into the second chamber B through the second duct 92, and then flows out from the exhaust port 12B of the inner case 12 through the third duct 93. It can be seen that, by setting the distribution positions of the first pipeline 91, the second pipeline 92, the third pipeline 93 and the fourth pipeline 94, the flowing time of the high-temperature gas in the inner box body 12 can be increased, sufficient heat exchange can be performed with the condensed water, and the heat exchange effect of the condensed water and the high-temperature gas can be further improved.

The first partition plate 121, the second partition plate 122 and the third partition plate 123 may be respectively disposed in the inner case 12 by welding.

In addition, as shown in fig. 2, in a possible design, the first pipe 91 and the fourth pipe 94 are located in the same horizontal plane or are arranged in a staggered manner from top to bottom, and the third pipe 93 and the second pipe 92 are arranged in sequence from bottom to top. By such arrangement, the high-temperature gas in the inner box body 12 can be effectively subjected to heat exchange.

The inlet end of the first duct 91 is welded to the first separator 121, and the outlet end of the first duct 91 is welded to the second separator 122. The fourth pipe 94 is welded to the third partition 123, and has an inlet end in the third chamber C and an outlet end in the fourth chamber D; the inlet end of the second duct 92 is welded to the second separator 122, and the outlet end of the second duct 92 is welded to the third separator 123. The air inlet end of the third duct 93 is welded to the second partition 122, and the air outlet end of the third duct 93 is welded to the third partition 123 and the air outlet 12b of the inner case 12.

In one possible design, the gas inlet 12a of the inner box 12 extends to the outside of the liquid inlet 11b of the outer box 11, so that the gas flowing direction in the inner box 12 is the same as the liquid flowing direction in the outer box 11.

In a possible design, the air inlet 12a of the inner box 12 extends to the outside of the outlet pipe 11a of the outer box 11, so that the air flowing direction in the inner box 12 is the same as the liquid flowing direction in the outer box 11, and the heat exchange efficiency is high.

In one possible design, a secondary waste heat recovery cavity 10 is arranged between the waste heat recovery main body 1 and the cooling circulation water tank 4; this second grade waste heat recovery chamber 10 includes: the secondary exhaust pipeline 10b is positioned in the outer cavity 10 a; the first end of the secondary exhaust duct 10b is connected to the exhaust port 12b of the inner box 12, and the second end extends to the outside of the secondary waste heat recovery chamber 10. By such arrangement, the flow direction of the condensed water in the outer box body 11 can be the same as the flow direction of the gas in the inner box body 12, and the heat exchange effect between the condensed water and the high-temperature gas is improved.

Above-mentioned liquid outlet pipeline 11a between outer box 11 and the second grade waste heat recovery chamber 10 is connected with the welded mode, can avoid having the gap between liquid outlet pipeline 11a and the second grade waste heat recovery chamber 10 of outer box 11 like this, and then can prevent that the comdenstion water in the outer box 11 from flowing out.

In a possible design, a water suction pump is arranged in the secondary waste heat recovery cavity 10, and the water suction pump is used for pumping the heated condensed water to the downstream circulating heat tracing equipment, and the condensed water flows to the cooling circulating water tank 4 after being circularly cooled.

With the above arrangement, when high-temperature gas (700 to 800 ℃) in the engine M flows into the inner case 12 of the waste heat recovery main body 1 through the exhaust port of the engine M, heat exchange with the condensed water in the outer case 11 is performed. The heated condensed water flows into the secondary waste heat recovery cavity 10 through the liquid outlet pipeline 11a of the outer box body 11, and then flows to downstream equipment for heat recycling.

In one possible design, the safety valve 2 is a mechanical safety valve. In the embodiment of the present application, the safety valve 2 is a mechanical safety valve. Through so setting up, not only reducible waste heat recovery device's preparation cost still does benefit to the installation of relief valve 2.

As an example, the mechanical safety valve may include: the valve comprises a valve body, a spring and a valve core, wherein the spring and the valve core are arranged in the valve body; the valve body is provided with a first port and a second port, a gas channel is formed between the first port and the second port in a matching mode, and the first port is also communicated with the waste heat recovery main body 1; the valve core is connected with the spring, and when the spring is in a natural state, the valve core blocks the gas channel.

In the embodiment of the present application, the first predetermined pressure may be 0.35MPa to 0.45MPa, and may be, for example, 0.35MPa, 0.36MPa, 0.37MPa, 0.38MPa, 0.39MPa, 0.40MPa, 0.41MPa, 0.42MPa, 0.43MPa, 0.44MPa, 0.45MPa, or the like. The second predetermined pressure is 0.75MPa to 0.85MPa, and may be, for example, 0.75MPa, 0.76MPa, 0.77MPa, 0.78MPa, 0.79MPa, 0.80MPa, 0.81MPa, 0.82MPa, 0.83MPa, 0.84MPa, 0.85MPa or the like. Through so setting up, can prevent effectively that waste heat recovery main part 1 from exploding because of inside vapor pressure is too big, can prolong waste heat recovery main part 1's life.

In the embodiment of the present application, the first predetermined temperature is 94 ℃ to 96 ℃, and for example, 94 ℃, 94.5 ℃, 95 ℃, 95.5 ℃, 96 ℃ and the like can be used; the second predetermined temperature is 99-101 deg.C, for example, 99 deg.C, 99.5 deg.C, 100 deg.C, 100.5 deg.C, 101 deg.C, etc. Through so setting up, can prevent effectively that waste heat recovery main part 1 from exploding because of inside vapor pressure is too big, can prolong waste heat recovery main part 1's life.

It should be noted that, in the embodiment of the present application, the setting of the first preset liquid level and the second preset liquid level may be set according to the volume of the cooling circulation water tank 4 and the amount of water required for cooling the exhaust gas of the engine M.

In the embodiment of the present application, both the outer case 11 and the inner case 12 may be formed in a cylindrical shape.

In addition, in the embodiment of the present application, the outer box 11 and the inner box 12 may be made of boiler steel, and the outer box 11 and the inner box 12 made of such materials have the characteristic of strong corrosion resistance.

In the embodiment of the present application, the cooling circulation water tank 4 may be disposed in a barrel structure, and a liquid discharge port is disposed at the bottom of the cooling circulation water tank 4. The material of the cooling circulation tank 4 may be boiler steel.

It should be noted that the relay 7 according to the embodiment of the present application is a transfer-type relay, as shown in fig. 3, the switch 71 of the relay 7 may be manually controlled or electrically coupled to the controller 6, the controller 6 is configured to control the switch 71 to open and close, and the movable contact 72 and the normally closed contact 73 of the relay 7 are electrically coupled to the terminals of the engine M, respectively. Wherein an equivalent circuit between the relay 7 and the engine M is shown in fig. 3. When the switch 71 of the relay 7 is in an open state, the armature 76 moves upward under the action of the spring to be attracted with the normally closed contact 73, and the working circuit of the engine M is in a conducting state. When the switch of the relay 7 is in the off state, the coil 75 with the iron core 74 outputs a corresponding magnetic field to attract the armature 76, the armature 76 is attracted with the normally open contact 77, the working circuit of the engine M is forcibly disconnected, and the engine M stops working. Once the switch state of the relay 7 is changed from the closed state to the open state, the armature 76 of the relay 7 pulls the armature 76 into the normally closed contact 73 under the action of the restoring force of the spring 78, and at this time, the working circuit of the engine M is in the conducting state again.

When in use, the waste heat recovery body 1 is first installed on the engine M, the air inlet 12a of the waste heat recovery body 1 is communicated with the air outlet of the engine M, and the relay is electrically coupled to the connection terminal of the engine M.

When the water vapor pressure in the waste heat recovery main body 1 is smaller than a first preset pressure, the safety valve 2 is in a closed state. When the pressure of the water vapor in the waste heat recovery main body 1 exceeds a first preset pressure, the safety valve 2 is in an open state, the waste heat recovery main body 1 is decompressed, and the water vapor in the waste heat recovery main body 1 is discharged.

In the operation process of the waste heat recovery device, the pressure sensor acquires the pressure information of the water vapor in the waste heat recovery main body 1 in real time, and the pressure information of the water vapor can be read by workers, or the pressure sensor can transmit the pressure information of the water vapor to the controller 6. When the pressure of the water vapor in the waste heat recovery main body 1 exceeds a second preset pressure, the controller 6 opens the electromagnetic valve to release the pressure of the waste heat recovery main body 1, and the water vapor in the waste heat recovery main body 1 is discharged, so that the problem that the water vapor in the waste heat recovery main body 1 cannot be discharged in time due to the failure of the safety valve 2 can be avoided.

During the operation of the waste heat recovery device, the temperature sensor 3 acquires temperature information in the waste heat recovery main body 1, which can be read by a worker, or the temperature sensor 3 can transmit the temperature information to the controller 6. When the temperature in the waste heat recovery main body 1 exceeds a first preset temperature, the controller 6 sends an alarm signal, so that the terminal equipment (such as a mobile phone or a computer) receives the alarm signal, and an operator can be ensured to timely master the working state of the waste heat recovery device. When the temperature in the waste heat recovery main body 1 exceeds the second preset temperature, the controller 6 closes the switch of the relay 7 according to the temperature information, the armature 76 of the relay 7 is attracted with the normally open contact 77, the working circuit of the engine M is forcibly disconnected, the engine M stops working, the temperature in the waste heat recovery main body 1 is prevented from being continuously increased, the pressure relief of the safety valve 2 is added, the explosion of the waste heat recovery main body 1 due to the fact that the pressure of water vapor in the waste heat recovery main body 1 is too large can be effectively prevented, and the cost is greatly saved.

Meanwhile, in the operation process of the waste heat recovery device, the liquid level sensor 5 acquires the liquid level information of the cooling circulation water tank 4, and the liquid level information can be read by a worker, or the liquid level sensor 5 can transmit the liquid level information to the controller 6. When the liquid level in the cooling circulation water tank 4 is lower than a first preset liquid level, the controller 6 sends an alarm signal, so that the terminal equipment (such as a mobile phone or a computer) receives the alarm signal, and further, an operator can be ensured to timely master the working state of the waste heat recovery device. When the liquid level in the cooling circulation water tank 4 is lower than the second preset liquid level, the controller 6 closes the switch of the relay 7 according to the temperature information, the armature 76 of the relay 7 is attracted with the normally open contact 77, the working circuit of the engine M is forcibly disconnected, the engine M stops working, the temperature in the waste heat recovery main body 1 can be prevented from continuously rising due to insufficient cooling water capacity in the cooling circulation water tank 4, the explosion of the waste heat recovery main body 1 due to overlarge internal water vapor pressure can be effectively prevented, and the cost is greatly saved.

Therefore, according to the waste heat recovery device provided by the embodiment of the application, when a downstream device (for example, a water pump communicated with a liquid outlet of the waste heat recovery main body 1) fails to cause cold water in the waste heat recovery main body 1 to stop flowing, so that the pressure of water vapor in the waste heat recovery main body 1 exceeds a first preset pressure or a second preset pressure, the safety valve 2 or the electromagnetic valve can be used for relieving the pressure of the waste heat recovery main body 1, the water vapor in the waste heat recovery main body 1 is discharged, and the waste heat recovery main body 1 is prevented from being exploded; when the temperature in the waste heat recovery main body 1 exceeds a first preset temperature or when the liquid level in the cooling circulation water tank 4 is lower than a first preset liquid level due to the fault of the engine M, the controller 6 can be used for sending an alarm signal in a wired or wireless mode, for example, the alarm signal is sent to terminal equipment (such as a mobile phone or a computer), and further, an operator can be ensured to timely master the working state of the waste heat recovery device; when the temperature in the waste heat recovery main body 1 exceeds the second preset temperature or the liquid level in the cooling circulation water tank 4 is lower than the second preset liquid level due to the fault of the engine M, the engine M can be stopped through the matching of the controller 6 and the relay 7, the temperature in the waste heat recovery main body 1 is prevented from continuously rising, the cooling water liquefaction speed in the waste heat recovery main body can be reduced, the explosion of the waste heat recovery main body 1 due to the overlarge pressure of the internal water vapor can be effectively prevented, and the waste heat recovery cost of the engine M is greatly saved.

In the embodiment of the present application, as shown in fig. 3, the waste heat recovery device further includes: a wireless signal transmitting module 8 electrically coupled to the controller 6; the controller 6 is used for sending an alarm signal through the wireless signal sending module 8.

Through setting up as above, when the temperature in the waste heat recovery main part 1 exceeded first predetermined temperature or the liquid level in the cooling circulation water tank 4 was less than first predetermined liquid level, usable wireless signal transmission module 8 sent alarm signal to terminal equipment (for example cell-phone or computer), so not only in time reminded staff waste heat recovery device trouble, can in time maintain waste heat recovery device, can need not be connected with the signal transmission electric wire between wireless signal transmission module 8 and terminal equipment moreover.

All the above optional technical solutions may be combined arbitrarily to form optional embodiments of the present application, and are not described herein again.

The above description is only exemplary of the present application and should not be taken as limiting the scope of the present application, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. A heat recovery device for an engine, characterized in that the heat recovery device comprises: the waste heat recovery system comprises a waste heat recovery main body (1), a safety valve (2), a temperature sensor (3), an electromagnetic valve, a pressure sensor, a cooling circulating water tank (4), a liquid level sensor (5) arranged on the cooling circulating water tank (4), and a relay (7) electrically coupled with an engine (M);

the waste heat recovery main body (1) comprises: the liquid container comprises an outer box body (11) and an inner box body (12) positioned in the outer box body (11), wherein a first liquid channel (13), a second liquid channel (14) and a third liquid channel (15) are formed between the outer box body (11) and the inner box body (12);

the outer box body (11) is provided with a liquid inlet (11b) and a liquid outlet pipeline (11a), and the liquid inlet (11b) is communicated with a liquid outlet of the cooling circulating water tank (4);

a main partition plate (11c) is arranged between the outer box body (11) and the inner box body (12) so that liquid flowing into the waste heat recovery main body (1) from the liquid inlet (11b) flows out of the waste heat recovery main body (1) through the first liquid channel (13), the second liquid channel (14) and the third liquid channel (15);

the safety valve (2), the temperature sensor (3), the electromagnetic valve and the pressure sensor are all arranged on the outer box body (11);

the inner box body (12) is provided with an air inlet (12a) and an air outlet (12b), the air inlet (12a) and the air outlet (12b) both extend to the outside of the outer box body (11), and the air inlet (12a) is used for being communicated with an air outlet of the engine (M).

2. The waste heat recovery device according to claim 1, wherein a first partition plate (121), a second partition plate (122) and a third partition plate (123) are sequentially arranged in the inner part of the inner case (12) along the gas flow direction, so that the inner case (12) is divided into a first chamber (A), a second chamber (B), a third chamber (C) and a fourth chamber (D);

the waste heat recovery main body (1) further comprises: a first duct (91), a second duct (92), a third duct (93) and a fourth duct (94);

the first duct (91) communicates between the first chamber (A) and the third chamber (C);

the second duct (92) communicating between the second chamber (B) and the fourth chamber (D);

the third pipeline (93) is communicated between the second chamber (B) and an exhaust port (12B) of the inner box body (12);

the fourth conduit (94) communicates between the third chamber (C) and the fourth chamber (D).

3. A waste heat recovery device according to claim 2, characterized in that the first duct (91) and the fourth duct (94) are located in the same horizontal plane.

4. The waste heat recovery device according to claim 2, wherein the third pipeline (93) and the second pipeline (92) are arranged in sequence from bottom to top.

5. The waste heat recovery device according to claim 1, wherein the air inlet (12a) of the inner case (12) extends to the outside of the liquid inlet (11b) of the outer case (11).

6. The waste heat recovery device according to claim 1, wherein the air inlet (12a) of the inner case (12) extends to the outside of the outlet duct (11a) of the outer case (11).

7. The waste heat recovery device according to claim 1, characterized in that a secondary waste heat recovery cavity (10) is arranged between the waste heat recovery body (1) and the cooling circulation water tank (4);

the secondary waste heat recovery cavity (10) comprises: the device comprises an outer cavity (10a) and a secondary exhaust pipeline (10b) positioned in the outer cavity (10 a);

the first end of the secondary exhaust pipeline (10b) is connected with the exhaust port (12b) of the inner box body (12), and the second end of the secondary exhaust pipeline extends to the outside of the secondary waste heat recovery cavity (10).

8. A waste heat recovery device according to claim 7, characterized in that a suction pump is arranged in the secondary waste heat recovery cavity (10).

9. The waste heat recovery device according to claim 1, characterized in that the safety valve (2) is a mechanical safety valve.

10. The waste heat recovery device according to any one of claims 1 to 9, wherein the outer case (11) and the inner case (12) are made of boiler steel.

Images