Waste heat recycling device of air compressor for threshing and redrying

Abstract

The utility model relates to an air compressor waste heat recycling device for threshing and redrying. The device comprises an air compressor, an oil-gas separator, a heat recovery system, an original temperature control valve and an oil cooler. The air compressor, the oil-gas separator, the heat recovery system and the original temperature control valve are connected in series through an oil pipe; the air compressor is connected with the original temperature control valve through an oil pipe; and the oil cooler is connected in parallel with the original temperature control valve through an oil pipe. The device is scientific and reasonable in structure, convenient to manufacture, time-saving and labor-saving in part maintenance and replacement, and capable of saving production cost of enterprises; according to the device, energy consumption is well reduced, the use efficiency of low-temperature waste heat is improved, and the device is very worthy of popularization.

Description

Technical Field

[0001] The utility model belongs to the technical field of waste heat recovery device structures, in particular to the technical field of waste heat recovery and utilization devices of air compressors for leaf threshing and re-baking. Background Art

[0002] Green and low-carbon development has become the main theme of the industry's development. We will comprehensively promote clean production, strengthen the innovative application of green and low-carbon technologies and energy-saving and emission reduction technologies, accelerate the elimination of old equipment with high energy consumption, high pollution and backward technology, and strengthen energy-saving transformation of infrastructure such as buildings, lighting and heating, which has pointed out the direction for the development of the industry.

[0003] Compressed air is widely used in all aspects of tobacco production and processing due to its unique advantages such as cleanliness, safety, and ease of use. The air compressor that produces compressed air is itself a power device with high energy consumption. For redrying enterprises, the air compressors used in their production process are generally oil-injected screw compressors. About 75% of the energy is consumed in the hot oil circuit. In order to reduce the oil temperature of the air compressor, it is also necessary to consume electricity to start the cooling fan or circulate cooling water to reduce the oil temperature to ensure the normal operation of the air compressor. In addition to part of the input power being converted into the potential energy of the compressed air, most of the other energy is discharged into the air in the form of waste heat, resulting in a large waste of heat energy, which is not in line with the future development trend of the industry. Summary of the invention

[0004] The utility model is to solve the above-mentioned problems and defects and provides a waste heat recovery and utilization device of an air compressor for leaf threshing and re-drying.

[0005] The present invention provides a waste heat recovery and utilization system of an air compressor for leaf threshing and re-drying, and specifically relates to the production link of leaf threshing and re-drying. The waste heat of the air compressor is recovered to heat soft water and then used for moistening leaves, for rehumidifying roasted slices, or for boilers.

[0006] The utility model is implemented by the following technical solution.

[0007] A waste heat recovery device for an air compressor used for leaf threshing and re-drying, the device comprising an air compressor, an oil-gas separator, a heat recovery system, an existing temperature control valve, and an oil cooler;

[0008] The air compressor, oil-gas separator, heat recovery system and original temperature control valve are connected in series through oil pipes;

[0009] The air compressor is connected to the original temperature control valve through an oil pipe;

[0010] The oil cooler is connected in parallel with the original temperature control valve through an oil pipe.

[0011] Furthermore, an oil filter is provided between the air compressor of the utility model and the original temperature control valve; the air compressor is connected to the oil pipe of the original temperature control valve through the oil filter.

[0012] Furthermore, the heat recovery system of the utility model includes a plate heat exchanger, an oil temperature control valve, a valve A, a valve B, and a valve C; the valve C is arranged between the oil-gas separator and the original temperature control valve;

[0013] One end of valve A is connected to an oil pipe on one side of the oil inlet end of valve C;

[0014] One end of valve B is connected to the oil pipe on the oil outlet side of valve C;

[0015] The other end of valve A is connected to the oil side of the plate heat exchanger through an oil temperature control valve;

[0016] One end of valve B is connected to the oil side of the plate heat exchanger through an oil pipe;

[0017] The oil pipe between valve B and the oil side of the plate heat exchanger is also connected to the oil temperature control valve.

[0018] Furthermore, a temperature sensor is fixedly connected to the oil pipe between the oil temperature control valve and the plate heat exchanger of the utility model.

[0019] Furthermore, a temperature sensor is fixedly connected to the oil pipe between the valve B and the plate heat exchanger of the utility model.

[0020] Furthermore, the water side of the plate heat exchanger of the utility model is connected to the application end through a water pipe; a temperature sensor or a temperature sensor and a water temperature control valve are fixedly arranged between the water side of the plate heat exchanger and the application end.

[0021] Furthermore, the plate heat exchanger described in the present invention is a waste heat recovery plate heat exchanger HRS.

[0022] Furthermore, the oil-gas separator described in the utility model is an oil-gas separation barrel or an oil-gas separation filter barrel or an oil-gas separation tank, all of which are existing product devices.

[0023] The heat dissipation principle of air compressor is:

[0024] When the air compressor is running, the high-pressure air generated in the compression chamber mixes with the circulating oil to form a high-pressure and high-temperature oil-gas mixture, which enters the oil-gas separator and is separated into oil gas and compressed air. The compressed air enters the gas circuit system and is cooled by the air cooler before being supplied to the gas-using equipment at the lower end. After separation, the oil and gas condense into high-temperature liquid oil and then enter the oil circuit system. After being cooled by the oil cooler, it returns to the compression chamber, completing a compressed air supply and demand cycle.

[0025] The purpose of adding a waste heat recovery device to this system is to exchange heat between the high-temperature circulating oil and the normal-temperature water in the heat recovery system unit, so that the water temperature rises, and the heat energy in the oil and gas is fully absorbed and cooled before returning to the compression chamber machine; during implementation, the oil circuit of the original air compressor's cooling system needs to be simply modified: a new oil circuit system is added, so that the high-temperature lubricating oil after the oil-gas separator no longer enters the crude oil cooler but is introduced into the newly added oil circuit system to enter the heat exchange end of the heat recovery system, and exchanges heat with the normal-temperature water in the heat recovery device. The water heated by heat exchange enters the application end through the interface outside the heat exchange device; the lubricating oil after heat exchange and cooling is guided by the oil temperature control valve or enters the crude oil cooler (when the temperature of the lubricating oil coming out of the heat recovery system is higher than 70°C) or directly returns to the compression chamber of the oil-injected screw air compressor (when the temperature of the lubricating oil coming out of the heat recovery system is lower than 70°C), to ensure the normal operation of the air compressor.

[0026] The beneficial effects of the utility model are that the utility model has a scientific and reasonable structure, is easy to manufacture, saves time and effort in repairing and replacing parts, and saves production costs for enterprises; the device of the utility model effectively reduces energy consumption and improves the utilization efficiency of low-temperature waste heat, and is very worthy of promotion.

[0027] The utility model is further explained below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the utility model.

[0029] The numbers in the figure are: 1-oil-injected screw air compressor; 2-oil-gas separator; 3-oil filter; 4-original temperature control valve; 5-oil cooler; 6-oil temperature control valve; 7-plate heat exchanger; 8-temperature sensor; 9-water temperature control valve. DETAILED DESCRIPTION

[0030] The following embodiments are only a part of the technical solution of the present utility model, and are not intended to limit the entire technical solution of the present utility model. The embodiments of the present utility model are provided to further explain and illustrate the details of the technical solution of the present utility model.

[0031] See Figure 1 A waste heat recovery device for an air compressor used for leaf threshing and re-drying, the device comprising an air compressor, an oil-gas separator, a heat recovery system, an existing temperature control valve, and an oil cooler;

[0032] The air compressor, oil-gas separator, heat recovery system and original temperature control valve are connected in series through oil pipes;

[0033] The air compressor is connected to the original temperature control valve through an oil pipe;

[0034] The oil cooler is connected in parallel with the original temperature control valve through an oil pipe.

[0035] Furthermore, an oil filter is provided between the air compressor of the utility model and the original temperature control valve; the air compressor is connected to the oil pipe of the original temperature control valve through the oil filter.

[0036] Furthermore, the heat recovery system of the utility model includes a plate heat exchanger, an oil temperature control valve, a valve A, a valve B, and a valve C; the valve C is arranged between the oil-gas separator and the original temperature control valve;

[0037] One end of valve A is connected to an oil pipe on one side of the oil inlet end of valve C;

[0038] One end of valve B is connected to the oil pipe on the oil outlet side of valve C;

[0039] The other end of valve A is connected to the oil side of the plate heat exchanger through an oil temperature control valve;

[0040] One end of valve B is connected to the oil side of the plate heat exchanger through an oil pipe;

[0041] The oil pipe between valve B and the oil side of the plate heat exchanger is also connected to the oil temperature control valve.

[0042] Furthermore, a temperature sensor is fixedly connected to the oil pipe between the oil temperature control valve and the plate heat exchanger of the utility model.

[0043] Furthermore, a temperature sensor is fixedly connected to the oil pipe between the valve B and the plate heat exchanger of the utility model.

[0044] Furthermore, the water side of the plate heat exchanger of the utility model is connected to the application end through a water pipe; a temperature sensor or a temperature sensor and a water temperature control valve are fixedly arranged between the water side of the plate heat exchanger and the application end.

[0045] Furthermore, the plate heat exchanger described in the present invention is a waste heat recovery plate heat exchanger HRS.

[0046] Furthermore, the oil-gas separator described in the utility model is an oil-gas separation barrel or an oil-gas separation filter barrel or an oil-gas separation tank, all of which are existing product devices.

[0047] The specific working principle is:

[0048] The motor drives the screw machine to rotate, and the air is sucked into the oil-injected screw compressor through the filter, compressed into high-pressure air, and mixed with the circulating oil to form a high-pressure and high-temperature oil-gas mixture, which then enters the oil-gas separator. After the oil-gas mixture is separated into oil and gas, the compressed air is supplied to the user after heat dissipation; and after the circulating oil and gas are separated and condensed into liquid oil, they return to the oil-injected screw compressor through the radiator, completing a cycle. The air compressor thermal energy hot water unit introduces high-temperature circulating oil into the unit, exchanges heat with water, and raises the water temperature. At the same time, because the heat energy in the oil and gas is fully absorbed by the thermal energy hot water unit, the oil-injected screw compressor can be cooled.

[0049] The specific embodiments are:

[0050] One of the Ingersoll Rand 160KW air-cooled screw air compressors in the air compressor station of the 12000KG / h production line of the Shizong Redrying Plant was transformed for energy saving, and a waste heat recovery device was added to fully utilize the heat energy of the lubricating oil in the form of hot water through heat exchange, while improving the operating conditions of the air compressor. The soft water for production was introduced into the heat exchange end of the air compressor waste heat recovery device to exchange heat with the high-temperature lubricating oil, increase the temperature of the soft water for production, and play a role in auxiliary heating; the operation data showed that under the premise of ensuring that the water consumption was 3 tons per hour, the temperature rise of the soft water for Runye was not less than 23℃ before being heated by steam using the waste heat of the air compressor. The increase in the temperature of the soft water for production actually reduced the consumption of steam for heating. According to calculations, it is equivalent to saving 8.1176 cubic meters of natural gas per hour and saving 40.58 yuan in natural gas costs per hour; based on the calculation that the air compressor runs for 3000 hours in a baking season, it can save about 24,352 cubic meters of natural gas and reduce carbon dioxide emissions by about 48 tons, which has good energy-saving and social benefits.

[0051] The above is only a specific embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A waste heat recovery and utilization device for air compressor used for leaf threshing and re-drying, characterized in that: The device includes an air compressor, an oil-gas separator, a heat recovery system, an existing temperature control valve, and an oil cooler; The air compressor, oil-gas separator, heat recovery system and original temperature control valve are connected in series through oil pipes; The air compressor is connected to the original temperature control valve through an oil pipe; The oil cooler is connected in parallel with the original temperature control valve through an oil pipe.

2. The waste heat recovery and utilization device of an air compressor for leaf threshing and re-roasting according to claim 1 is characterized in that: An oil filter is arranged between the air compressor and the original temperature control valve; the air compressor is connected to the oil pipe of the original temperature control valve through the oil filter.

3. The waste heat recovery and utilization device of an air compressor for leaf threshing and re-roasting according to claim 1 is characterized in that: The heat recovery system includes a plate heat exchanger, an oil temperature control valve, a valve A, a valve B, and a valve C; the valve C is arranged between the oil-gas separator and the original temperature control valve; One end of valve A is connected to an oil pipe on one side of the oil inlet end of valve C; One end of valve B is connected to the oil pipe on the oil outlet side of valve C; The other end of valve A is connected to the oil side of the plate heat exchanger through an oil temperature control valve; One end of valve B is connected to the oil side of the plate heat exchanger through an oil pipe; The oil pipe between valve B and the oil side of the plate heat exchanger is also connected to the oil temperature control valve.

4. The waste heat recovery device for air compressor used for leaf threshing and re-roasting according to claim 3 is characterized in that: A temperature sensor is fixedly connected to the oil pipe between the oil temperature control valve and the plate heat exchanger.

5. The waste heat recovery and utilization device of an air compressor for leaf threshing and re-roasting according to claim 3 is characterized in that: A temperature sensor is fixedly connected to the oil pipe between the valve B and the plate heat exchanger.

6. The waste heat recovery and utilization device of an air compressor for leaf threshing and re-roasting according to claim 3 is characterized in that: The water side of the plate heat exchanger is connected to the application end through a water pipe; a temperature sensor or a temperature sensor and a water temperature control valve are fixedly arranged between the water side of the plate heat exchanger and the application end.

7. The device for recovering waste heat from an air compressor for leaf threshing and re-roasting according to claim 3, 4, 5 or 6, characterized in that: The plate heat exchanger is a waste heat recovery plate heat exchanger HRS.

8. The waste heat recovery and utilization device of an air compressor for leaf threshing and re-roasting according to claim 1 or 3, characterized in that: The oil-gas separator is an oil-gas separation barrel or an oil-gas separation filter barrel or an oil-gas separation tank.

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