Boiler heat recovery device for combined heat and power generation

Abstract

The invention belongs to the technical field of energy recovery, and particularly relates to a boiler heat recovery device for combined heat and power generation, heat recovery mechanisms with different heights can be flexibly started for heat exchange according to the liquid level height in a tank body through the arrangement of a floating valve, and the heat exchange effect is fully ensured; the conversion assembly can further change the output path of the gas path according to the waste heat temperature and pressure of the input waste heat steam, and therefore the effect that heat exchange is more efficient is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of energy recovery, and in particular relates to a boiler heat recovery device for cogeneration of heat and power. Background Art

[0002] Cogeneration is the use of heat engines or power stations to generate electricity and useful heat at the same time. In order to make full use of energy, this part of waste heat is often recycled. At present, waste heat is mostly reflected in waste heat steam, that is, high-temperature exhaust gas generated after the combustion of energy in the process of burning power generation. In order to recover this part of heat, most of this waste heat steam is currently input into boiler water for heat recovery. The heated water is then used for central heating, secondary power generation, etc. However, the current general boilers are not flexible enough when recovering heat energy. It is difficult to make flexible adjustments in real time according to the status in the boiler and the input waste heat steam, which can easily lead to insufficient heat recovery of waste heat steam, resulting in waste of resources and insufficient cooling of exhaust gas, which pollutes the environment. Summary of the invention

[0003] The purpose of the present invention is to provide a boiler heat recovery device for cogeneration of heat and power, so as to solve the problems mentioned in the background technology.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A heat recovery device for a boiler used in cogeneration of heat and power, comprising a tank body and a control panel, wherein the upper end and the lower end of the tank body are respectively provided with a water inlet and a water outlet, the upper end of the tank body is also provided with a steam outlet, and a heat recovery mechanism is provided in the tank body;

[0006] The heat recovery mechanism includes an air intake pipe, an exhaust pipe, a floating valve and several groups of heat exchange components, one end of the air intake pipe is connected to an external steam outlet, the floating valve is located in the tank body and connected to the other end of the air intake pipe, several groups of heat exchange component arrays are arranged in the tank body and connected to the outlet of the floating valve, and the exhaust pipe is arranged on the other side of the tank body relative to the air intake pipe and connected to the exhaust ports of several heat exchange components in the same group;

[0007] The floating valve includes a first tube body, a floating plate, a connecting rod, a first plug body and a first spring. The first tube body is integrally formed with the intake pipe and is distributed in a cross structure with the axis of the first tube body perpendicular to the ground. The first plug body is slidingly sealed in the first tube body. One end of the connecting rod is concentrically connected to the first plug body and extends out of the upper end of the first tube body. The floating plate is connected to the other end of the connecting rod. The first spring is sleeved on the connecting rod and is located in the first tube body. A first annular groove is opened on the side of the first plug body and is offset from the intake pipe in an initial state.

[0008] The heat exchange component comprises a connector and a serpentine air pipe, wherein the connectors are two in number and are respectively arranged at two ends of the serpentine air pipe.

[0009] A conversion component is also provided between the connecting head and the serpentine air pipe, and the conversion component includes an active valve, a conversion valve and a long rod. When the conversion component is provided, the number of serpentine air pipes is two, and the active valve is provided at the connecting head corresponding to the side of the air inlet pipe. A U-shaped airway is opened in the connecting head and corresponds to two serpentine air pipes. A return air pipe is provided between the two serpentine air pipes. The number of the active valves is two and they are respectively provided in the two connecting heads and in the U-shaped airway on the side of the connecting end corresponding to the return air pipe. The long rod is connected to the two conversion valves.

[0010] The movable valve includes a sealing plate and a second spring. An inner cavity connected to the U-shaped airway is opened in the middle of the connecting head. The sealing plate is slidably sealed in the inner cavity. One end of the long rod slides into the inner cavity and is connected to the sealing plate. The second spring is sleeved on the long rod and located in the inner cavity.

[0011] The conversion valve includes a second plug body and a side rod, the connecting head is provided with a through cavity, the through cavity is arranged on one side of the connection point of the adjacent return air pipe corresponding to the air paths on both sides of the U-shaped airway, the second plug body is slidingly sealed in the through cavity, one end of the side rod is connected to the long rod and the other end is connected to the second plug body, the side of the second plug body is provided with a second annular groove, and when the second spring is in the extended state, the second annular groove of the second plug body corresponds to the air path of the U-shaped airway.

[0012] The chamber of the first tube body, the inner cavity and the through cavity of the connector are all connected to the space inside the tank.

[0013] Compared with the prior art, the present invention has at least the following advantages:

[0014] Through the setting of the floating valve, the heat recovery mechanism at different heights can be opened flexibly for heat exchange according to the liquid level in the tank, fully ensuring the effect of heat exchange. The conversion component can further change the output path of the gas circuit according to the waste heat temperature and pressure of the input waste heat steam, thereby achieving a more efficient heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further illustrated by means of the non-limiting examples given in the accompanying drawings.

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a structural cross-sectional view of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the heat recovery mechanism of the present invention.

[0019] Figure 4 It is a structural cross-sectional view of the heat recovery mechanism of the present invention.

[0020] Figure 5 for Figure 4 A magnified schematic diagram of center A.

[0021] Figure 6 for Figure 4 A magnified schematic diagram of point B in the middle.

[0022] Tank body 1, water inlet 11, water outlet 12, steam outlet 13, air inlet pipe 14, exhaust pipe 15, first tube body 2, floating plate 21, connecting rod 22, first plug body 23, first spring 24, first annular groove 25, connector 3, serpentine air pipe 4, long rod 5, U-shaped airway 51, return air pipe 52, sealing sheet 6, second spring 61, inner cavity 62, second plug body 7, side rod 71, through cavity 72, second annular groove 73. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Example 1: Figure 1-6 As shown, a heat recovery device for a boiler used in cogeneration of heat and power comprises a tank body 1 and a control panel. A water inlet 11 and a water outlet 12 are respectively arranged at the upper and lower ends of the tank body 1. A steam outlet 13 is also arranged at the upper end of the tank body 1. A heat recovery mechanism is arranged inside the tank body 1.

[0025] The heat recovery mechanism includes an air inlet pipe 14, an exhaust pipe 15, a floating valve and several groups of heat exchange components. One end of the air inlet pipe 14 is connected to an external steam outlet. The floating valve is located in the tank body 1 and connected to the other end of the air inlet pipe 14. Several groups of heat exchange component arrays are arranged in the tank body 1 and connected to the outlet of the floating valve. The exhaust pipe 15 is arranged on the other side of the tank body 1 relative to the air inlet pipe 14 and connected to the exhaust ports of several heat exchange components in the same group.

[0026] The floating valve includes a first tube body 2, a floating plate 21, a connecting rod 22, a first plug body 23 and a first spring 24. The first tube body 2 and the intake pipe 14 are integrally formed and distributed in a cross structure, and the axis of the first tube body 2 is perpendicular to the ground. The first plug body 23 is slidingly sealed in the first tube body 2. One end of the connecting rod 22 is concentrically connected to the first plug body 23 and extends out of the upper end of the first tube body 2. The floating plate 21 is connected to the other end of the connecting rod 22. The first spring 24 is sleeved on the connecting rod 22 and is located in the first tube body 2. A first annular groove 25 is opened on the side of the first plug body 23 and is offset from the intake pipe 14 in the initial state.

[0027] When recovering waste heat, the hot steam generated by the cogeneration is input through the air inlet pipe 14, and the heat energy is converted to the water in the tank body 1 without pollution through the floating valve and the heat exchange component, thereby realizing the transfer and conversion of heat energy. The heated water can be used for other purposes such as central heating, and the clean hot steam evaporated in the tank body 1 can be used for secondary power generation to achieve waste heat recovery. According to the amount of waste heat steam input, in order to meet the efficiency of waste heat recovery, the amount of water in the tank body 1 is often flexibly adjusted. At this time, the liquid level in the tank body 1 and the water consumption during waste heat recovery will fluctuate. In this case, the floating plate 21 in the floating valve will fluctuate according to the liquid level, that is, the heat recovery mechanism at different heights in the tank body 1 will be opened according to the liquid level to ensure that the waste heat steam can effectively exchange heat with water, while avoiding the useless work of the heat exchange component in the tank body 1, and also avoiding the problems of the heat exchange structure being too long and easy to be damaged and the heat exchange efficiency being affected due to the wide distribution in the tank body 1.

[0028] When the floating plate 21 is acted upon by buoyancy, it will float upward and pull the connecting rod 22, thereby causing the first plug body 23 to slide upward in the first tube body 2. At this time, the annular groove on the first plug body 23 will gradually correspond to the intake pipe 14, so that the waste heat steam in the intake pipe 14 will be input into the heat recovery mechanism of the corresponding height. When the liquid level changes, the first spring 24 will push the first plug body 23 downward for reset. The maximum compression thrust of the first spring 24 is less than the buoyancy of the floating plate 21. At the same time, in order to ensure the normal circulation of waste heat steam, the heat recovery mechanism at the bottom of the tank body 1 may not be provided with a floating valve to ensure that the waste heat steam can flow in real time.

[0029] The heat exchange component includes a connector 3 and a serpentine air pipe 4. There are two connectors 3, which are respectively arranged at both ends of the serpentine air pipe.

[0030] Example 2: Figure 2-6 As shown, a further improvement on the basis of Example 1, a conversion component is further provided between the connector 3 and the serpentine air pipe 4, the conversion component includes an active valve, a conversion valve and a long rod 5, when the conversion component is provided, the number of the serpentine air pipes 4 is two, the active valve is provided at the connector 3 corresponding to the side of the air inlet pipe 14, a U-shaped airway 51 is opened in the connector 3 and corresponds to the two serpentine air pipes 4, a return air pipe 52 is provided between the two serpentine air pipes 4, the number of the active valves is two and they are respectively provided in the two connectors 3 and provided in the U-shaped airway 51 on the side of the connecting end corresponding to the return air pipe 52, and the long rod 5 is connected to the two conversion valves.

[0031] The movable valve includes a sealing plate 6 and a second spring 61. An inner cavity 62 connected to the U-shaped airway 51 is opened in the middle of the connecting head 3. The sealing plate 6 is slidingly sealed in the inner cavity 62. One end of the long rod 5 slides into the inner cavity 62 and is connected to the sealing plate 6. The second spring 61 is sleeved on the long rod 5 and is located in the inner cavity 62.

[0032] The conversion valve includes a second plug body 7 and a side rod 71. The connecting head 3 is provided with a through cavity 72. The through cavity 72 is arranged on one side of the connection point of the adjacent return air pipe 52 corresponding to the air paths on both sides of the U-shaped air channel 51. The second plug body 7 is slidingly sealed in the through cavity 72. One end of the side rod 71 is connected to the long rod 5 and the other end is connected to the second plug body 7. A second annular groove 73 is opened on the side of the second plug body 7. When the second spring 61 is in the extended state, the second annular groove 73 of the second plug body 7 corresponds to the air path of the U-shaped air channel 51.

[0033] The chamber of the first tube body 2, the inner cavity 62 and the through cavity 72 of the connector 3 are all connected to the inner space of the tank body 1.

[0034] Furthermore, when the waste heat energy of the input hot steam is high, in order to ensure that the waste heat can be fully absorbed and the temperature of the waste heat steam can be reduced, the waste heat steam input can be pressurized. At this time, since the conditions affecting the pressure such as the pipe diameter and length of the heat exchange component have not changed, the sealing plate 6 in the movable valve will be affected by the pressurization and slide in the inner cavity 62 and compress the second spring 61. At this time, the movement of the sealing plate 6 will push the long rod 5 to move. When the long rod 5 moves, it will simultaneously pull the second plug body 7 in the connecting head 3 through the side rod 71. At this time, the second plug bodies 7 in the two connecting heads 3 are displaced, that is, the second annular groove 73 opened on the side of the second plug body 7 will be offset in the air path of the U-shaped airway 51, thereby cutting off the air path. At the same time, since a return air pipe 52 is provided between the two serpentine air pipes 4, and the second plug body 7 is relative to the U-shaped The air paths on both sides of the air duct 51 are correspondingly arranged on one side of the connection point of the adjacent return air pipe 52, so the two serpentine air pipes 4 will cut off an air inlet and an air outlet respectively, and cooperate with the return air pipe 52 to extend the passage. At this time, the waste heat steam is switched from being output after heat exchange through a single serpentine air pipe 4 to being output after heat exchange through a single serpentine air pipe 4 and then flowing back to another serpentine air pipe 4 for heat exchange and then output. This can ensure that the waste heat recovery of the waste heat steam with a higher temperature is more sufficient, thereby improving the effect of waste heat recovery. Compared with directly setting a longer heat exchange loop, on the one hand, it can reduce the solidification of the waste heat steam after the corrosive material in the pipeline is cooled, thereby reducing the difficulty and frequency of loop maintenance. On the other hand, it can perform adaptive adjustment and switching under high and low pressure and high and low temperature input steam environments to improve the efficiency and effect of heat exchange.

[0035] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A heat recovery device for a boiler used in cogeneration of heat and power, comprising a tank body and a control panel, wherein the upper and lower ends of the tank body are respectively provided with a water inlet and a drain outlet, and the upper end of the tank body is also provided with a steam outlet, characterized in that: A heat recovery mechanism is provided in the tank body; The heat recovery mechanism includes an air intake pipe, an exhaust pipe, a floating valve and several groups of heat exchange components, one end of the air intake pipe is connected to an external steam outlet, the floating valve is located in the tank body and connected to the other end of the air intake pipe, several groups of heat exchange component arrays are arranged in the tank body and connected to the outlet of the floating valve, and the exhaust pipe is arranged on the other side of the tank body relative to the air intake pipe and connected to the exhaust ports of several heat exchange components in the same group; The floating valve includes a first tube body, a floating plate, a connecting rod, a first plug body and a first spring. The first tube body is integrally formed with the intake pipe and is distributed in a cross structure with the axis of the first tube body perpendicular to the ground. The first plug body is slidingly sealed in the first tube body. One end of the connecting rod is concentrically connected to the first plug body and extends out of the upper end of the first tube body. The floating plate is connected to the other end of the connecting rod. The first spring is sleeved on the connecting rod and is located in the first tube body. A first annular groove is opened on the side of the first plug body and is offset from the intake pipe in an initial state.

2. A heat recovery device for a cogeneration boiler according to claim 1, characterized in that: The heat exchange component comprises a connector and a serpentine air pipe, wherein the connectors are two in number and are respectively arranged at two ends of the serpentine air pipe.

3. A heat recovery device for a cogeneration boiler according to claim 2, characterized in that: A conversion component is also provided between the connecting head and the serpentine air pipe, and the conversion component includes an active valve, a conversion valve and a long rod. When the conversion component is provided, the number of serpentine air pipes is two, and the active valve is provided at the connecting head corresponding to the side of the air inlet pipe. A U-shaped airway is opened in the connecting head and corresponds to two serpentine air pipes. A return air pipe is provided between the two serpentine air pipes. The number of the active valves is two and they are respectively provided in the two connecting heads and in the U-shaped airway on the side of the connecting end corresponding to the return air pipe. The long rod is connected to the two conversion valves.

4. A heat recovery device for a cogeneration boiler according to claim 3, characterized in that: The movable valve includes a sealing plate and a second spring. An inner cavity connected to the U-shaped airway is opened in the middle of the connecting head. The sealing plate is slidably sealed in the inner cavity. One end of the long rod slides into the inner cavity and is connected to the sealing plate. The second spring is sleeved on the long rod and located in the inner cavity.

5. A heat recovery device for a cogeneration boiler according to claim 4, characterized in that: The conversion valve includes a second plug body and a side rod, the connecting head is provided with a through cavity, the through cavity is arranged on one side of the connection point of the adjacent return air pipe corresponding to the air paths on both sides of the U-shaped airway, the second plug body is slidingly sealed in the through cavity, one end of the side rod is connected to the long rod and the other end is connected to the second plug body, the side of the second plug body is provided with a second annular groove, and when the second spring is in the extended state, the second annular groove of the second plug body corresponds to the air path of the U-shaped airway.

6. A heat recovery device for a cogeneration boiler according to claim 5, characterized in that: The chamber of the first tube body, the inner cavity and the through cavity provided by the connector are all communicated with the space inside the tank body.

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