System for recovering waste gas heat of soybean meal drying tower to prepare steam

Abstract

The utility model discloses a system for recovering waste gas heat of a bean pulp drying tower to prepare steam. The system comprises a waste gas circulating device, a waste heat recovery device and a steam preparation device, heat in waste gas discharged during drying of the soybean meal drying tower is recovered; a secondary refrigerant absorbs heat in waste gas through dividing wall heat exchange in the multi-stage evaporator and then is changed into gas in a phase mode, the compressor sucks the gas, a small amount of electric energy is input to push the compressor to do work, the gas is compressed into high-temperature and high-pressure gas, the high-temperature and high-pressure gas enters the heat exchanger, and when the high-temperature and high-pressure gas releases heat to a medium (such as water) in the heat exchanger, the high-temperature and high-pressure gas enters the heat exchanger. The temperature of the medium rises to form high-temperature pressurized water, and the high-temperature pressurized water is separated by a steam-water separator to prepare steam; and the gas-phase secondary refrigerant is condensed into liquid, is cooled and pressurized by the expansion valve, and then returns to the waste heat recoverer to repeat the circulation. Therefore, the purpose of preparing steam from the waste gas of the drying tower is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a steam system technology field, especially relates to a system for recovering waste heat of a soybean meal drying tower to produce steam. BACKGROUND

[0002] Energy saving and emission reduction in the industrial field is of great significance to the national double carbon strategy. As a major energy consumer, the edible oil processing industry has high energy consumption and large primary energy consumption, with unit processing energy consumption exceeding 200 kg of steam per ton (bean), and urgently needs to develop new technologies for energy saving, consumption reduction, pollution reduction and carbon reduction.

[0003] Around the heat link for oil production, there are problems such as low energy utilization efficiency, dependence on primary energy, and serious waste of waste heat. Exploring how to use large temperature cross high temperature heat pump and deep waste heat recovery low carbon technology to recover waste heat in the drying section of the soybean meal production process has become the goal of energy saving and carbon reduction in oil production. SUMMARY

[0004] The utility model aims at providing a system for recovering waste heat of a soybean meal drying tower to produce steam, to solve the problems of low energy utilization efficiency, dependence on primary energy, and serious waste of waste heat in the heat link for oil production.

[0005] To solve the above technical problems, the utility model provides a system for recovering waste heat of a soybean meal drying tower to produce steam, which comprises a waste gas circulating device, a waste heat recovery device and a steam production device.

[0006] The waste gas circulating device circulates and introduces high temperature waste gas above the drying tower into the waste heat recovery device, and completes heat exchange with the multi-stage evaporator arranged in the waste heat recovery device.

[0007] The waste heat recovery device introduces the cold carrier into the multi-stage evaporator inside through the compressor, carries out interwall heat exchange with the multi-stage evaporator, and introduces the high temperature cold carrier into the heat exchanger inside.

[0008] The steam production device comprises a steam-water separator and a steam output pump connected with the heat exchange pipe inside the heat exchanger. By introducing cold water into the heat exchange pipe inside the heat exchanger, interwall heat exchange is carried out with the high temperature cold carrier inside the heat exchanger to produce high temperature pressurized water. The steam separated by the steam-water separator is output by the steam output pump.

[0009] Preferably, the waste heat recovery device comprises a recovery device shell and a multi-stage evaporator installed inside the recovery device shell.

[0010] Preferably, the inlet and outlet of the recovery device shell are communicated with the drying tower through a circulating waste gas pipe, so that the high temperature waste gas in the drying tower circulates through the inside of the recovery device shell and carries out interwall heat exchange with the multi-stage evaporator.

[0011] Preferably, the multi-stage evaporator is a structure in which multiple evaporators are connected in series in terms of airflow and in parallel in terms of cooling side.

[0012] Preferably, a blower is provided on the circulating waste gas pipe, and the waste gas in the drying tower is circulated in the waste heat recovery unit by the blower.

[0013] Preferably, the heat exchanger includes a heat exchanger housing and heat exchange tubes installed inside the heat exchanger housing.

[0014] Preferably, the outlet side of the multi-stage evaporator is connected to the interior of the heat exchanger shell via a first refrigerant connecting pipe; and the compressor is mounted on the first refrigerant connecting pipe.

[0015] The inlet side of the multi-stage evaporator is connected to the interior of the heat exchanger shell through a second refrigerant connecting pipe; under the action of the compressor, the refrigerant obtains heat through indirect heat exchange in the multi-stage evaporator and then enters the interior of the heat exchanger shell to release heat through indirect heat exchange with the heat exchange tubes.

[0016] Preferably, the second refrigerant connection pipe is also equipped with an expansion valve, through which the refrigerant is cooled and pressurized before returning to the multi-stage evaporator.

[0017] Preferably, the heat exchange tubes are arranged in a serpentine pattern inside the heat exchanger shell, with the inlet connected to a cold water source and the outlet connected to the steam-water separator.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This steam generation system recovers heat from the exhaust gas discharged from the soybean meal drying tower. The refrigerant absorbs heat from the exhaust gas through heat exchange within a multi-stage evaporator, transforming into a gas. This gas is then drawn into the compressor, which, with a small amount of electrical energy, compresses it into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas enters the heat exchanger, where it releases heat to a medium (such as water), causing the medium's temperature to rise and forming high-temperature, pressurized water. This water is then separated by a steam-water separator to produce steam. Meanwhile, the gaseous refrigerant condenses into a liquid, passes through an expansion valve for cooling and pressurization, and returns to the waste heat recovery unit to repeat the cycle. This achieves the goal of generating steam from the drying tower exhaust gas. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the system for recovering heat from waste gas in a soybean meal drying tower to produce steam, provided by this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the waste gas recirculation device provided by this utility model;

[0022] Figure 3 This is a schematic diagram of the waste heat recovery device provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the steam generation device provided by this utility model.

[0024] In the diagram: 10. Waste gas recirculation device; 20. Waste heat recovery device; 30. Steam generation device; 1. Drying tower; 2. Waste heat recovery unit; 3. Compressor; 4. Heat exchanger; 5. Steam-water separator; 6. Steam output pump; 7. Circulating waste gas pipe; 8. Blower; 9. Expansion valve; 201. Recovery unit shell; 202. Multi-stage evaporator; 401. Heat exchanger shell; 402. Heat exchanger tube; 100. First refrigerant connection pipe; 200. Second refrigerant connection pipe. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0026] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example

[0028] This utility model provides a system for recovering heat from waste gas in a soybean meal drying tower to produce steam. Please refer to [link / reference]. Figures 1-4 The system includes a waste gas recirculation device 10, a waste heat recovery device 20, and a steam generation device 30. The waste gas recirculation device 10 circulates the high-temperature waste gas above the drying tower 1 into the waste heat recovery device 2, and completes heat exchange with the multi-stage evaporator installed in the waste heat recovery device 2. The waste heat recovery device 20 introduces the refrigerant into the multi-stage evaporator through the compressor 3, and performs indirect heat exchange with the multi-stage evaporator, and introduces the high-temperature refrigerant into the heat exchanger 4. The steam generation device 30 includes a steam-water separator 5 connected to the heat exchange tubes inside the heat exchanger 4 and a steam output pump 6. By introducing cold water into the heat exchange tubes inside the heat exchanger 4, high-temperature pressurized water is produced through indirect heat exchange with the high-temperature refrigerant inside the heat exchanger 4. The steam after separation by the steam-water separator 5 is output through the steam output pump 6.

[0029] For details, please refer to Figure 2 The inlet and outlet of the recovery unit shell 201 are connected to the drying tower 1 through the circulating waste gas pipe 7, so that the high-temperature waste gas in the drying tower 1 circulates through the interior of the recovery unit shell 201 and exchanges heat with the multi-stage evaporator 202.

[0030] Furthermore, the multi-stage evaporator 202 is a structure in which the air ducts of multiple evaporators are connected in series and the cooling side is connected in parallel.

[0031] Furthermore, a blower 8 is provided on the circulating waste gas pipe 7, and the waste gas in the drying tower 1 is circulated in the waste heat recovery unit 2 by the blower 8.

[0032] For details, please refer to Figure 3 The heat exchanger 4 includes a heat exchanger housing 401 and heat exchange tubes 402 installed inside the heat exchanger housing 401.

[0033] The outlet side of the multi-stage evaporator 202 is connected to the interior of the heat exchanger housing 401 via a first refrigerant connecting pipe 100; and the compressor 3 is installed on the first refrigerant connecting pipe 100; the inlet side of the multi-stage evaporator 202 is connected to the interior of the heat exchanger housing 401 via a second refrigerant connecting pipe 200; under the action of the compressor 3, the refrigerant obtains heat through indirect heat exchange in the multi-stage evaporator 202 and then enters the interior of the heat exchanger housing 401 to release heat through indirect heat exchange with the heat exchange tubes 402.

[0034] Furthermore, the second refrigerant connection pipe 200 is also equipped with an expansion valve 9, through which the refrigerant is cooled and pressurized before returning to the multi-stage evaporator 202.

[0035] In some embodiments, the heat exchange tube 402 is arranged in a serpentine pattern inside the heat exchanger housing 401, with its inlet connected to a cold water source and its outlet connected to the steam-water separator 5.

[0036] This steam generation system recovers heat from the exhaust gas discharged from the soybean meal drying tower. The refrigerant absorbs heat from the exhaust gas through heat exchange within a multi-stage evaporator, transforming into a gas. This gas is then drawn into the compressor, which, with a small amount of electrical energy, compresses it into a high-temperature, high-pressure gas. This high-temperature, high-pressure gas enters the heat exchanger, where it releases heat to a medium (such as water), causing the medium's temperature to rise and forming high-temperature, pressurized water. This water is then separated by a steam-water separator to produce steam. Meanwhile, the gaseous refrigerant condenses into a liquid, passes through an expansion valve for cooling and pressurization, and returns to the waste heat recovery unit to repeat the cycle. This achieves the goal of generating steam from the drying tower exhaust gas.

[0037] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A system for recovering heat from waste gas in a soybean meal drying tower to produce steam, characterized in that, It includes a waste gas recirculation device (10), a waste heat recovery device (20), and a steam generation device (30). The waste gas circulation device (10) circulates the high-temperature waste gas above the drying tower (1) into the waste heat recovery unit (2) and completes heat exchange with the multi-stage evaporator set in the waste heat recovery unit (2); The waste heat recovery device (20) introduces the refrigerant into the multi-stage evaporator through the compressor (3) to exchange heat with the multi-stage evaporator through the wall, and introduces the high-temperature refrigerant into the heat exchanger (4). The steam generation device (30) includes a steam-water separator (5) connected to the heat exchange tube inside the heat exchanger (4) and a steam output pump (6); by introducing cold water into the heat exchange tube inside the heat exchanger (4), high-temperature pressurized water is generated through indirect heat exchange with the high-temperature refrigerant inside the heat exchanger (4), and the steam after separation by the steam-water separator (5) is output through the steam output pump (6).

2. The system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 1, characterized in that, The waste heat recovery unit (2) includes a recovery unit housing (201) and a multi-stage evaporator (202) installed inside the recovery unit housing (201).

3. The system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 2, characterized in that, The inlet and outlet of the recovery unit housing (201) are connected to the drying tower (1) through the circulating waste gas pipe (7), so that the high-temperature waste gas in the drying tower (1) circulates through the interior of the recovery unit housing (201) and exchanges heat with the multi-stage evaporator (202) through the wall.

4. The system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 3, characterized in that, The multi-stage evaporator (202) is a structure in which multiple evaporators are connected in series in terms of airflow and in parallel in terms of cooling side.

5. A system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 3, characterized in that, A blower (8) is installed on the circulating waste gas pipe (7), and the waste gas in the drying tower (1) is circulated in the waste heat recovery unit (2) by the blower (8).

6. A system for recovering heat from waste gas in a soybean meal drying tower to produce steam, as described in claim 2, characterized in that, The heat exchanger (4) includes a heat exchanger housing (401) and heat exchange tubes (402) installed inside the heat exchanger housing (401).

7. A system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 6, characterized in that, The outlet side of the multi-stage evaporator (202) is connected to the interior of the heat exchanger housing (401) via a first refrigerant connecting pipe (100); and the compressor (3) is installed on the first refrigerant connecting pipe (100); The inlet side of the multi-stage evaporator (202) is connected to the interior of the heat exchanger shell (401) through the second refrigerant connecting pipe (200); under the action of the compressor (3), the refrigerant enters the interior of the heat exchanger shell (401) after obtaining heat through the indirect heat exchange of the multi-stage evaporator (202) and then enters the interior of the heat exchanger shell (401) to release heat through indirect heat exchange with the heat exchange tube (402).

8. The system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 7, characterized in that, The second refrigerant connection pipe (200) is also equipped with an expansion valve (9). The refrigerant is cooled and pressurized by the expansion valve (9) and then returned to the multi-stage evaporator (202).

9. A system for recovering heat from waste gas in a soybean meal drying tower to produce steam as described in claim 6, characterized in that, The heat exchange tube (402) is arranged in a serpentine pattern inside the heat exchanger shell (401), with the inlet connected to a cold water source and the outlet connected to the steam-water separator (5).

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