Waste heat recovery energy-saving system of steam dryer for spinning

Abstract

The utility model discloses a steam dryer waste heat recovery energy-saving system for spinning, which relates to the technical field of energy recycling and comprises a dryer, a high-temperature air source heat pump, a flash tank and a steam ejector. Fresh steam is connected to the dryer through a first pipeline; fresh steam is connected to the steam ejector through a second pipeline; the dryer is connected to the high-temperature air source heat pump through a third pipeline; the high-temperature air source heat pump is connected to the flash tank through a fourth pipeline; the flash tank is connected to the steam ejector through a fifth pipeline; the dryer is connected to the flash tank through a sixth pipeline; the flash tank is connected to the high-temperature air source heat pump through a seventh pipeline; and the steam ejector is connected to the dryer through an eighth pipeline. The device can improve the grade of hot water and further recover waste heat of condensate water.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery and utilization, in particular to a waste heat recovery and energy-saving system for a textile steam dryer. Background Art

[0002] In the textile industry, steam dryers are mainly used for drying and fixing textile fabrics. Steam is introduced into the drum, and the drum is used to transfer the heat of the steam to the fabric outside the drum. After the fabric is heated, the moisture evaporates into the flowing air outside the drum and is discharged with the hot air flow or the dehumidification air flow. The steam introduced into the drum is liquefied into condensed water and discharged. Both the wet and hot waste gas and the steam condensed water contain a large amount of waste heat. In order to achieve energy conservation and emission reduction, it is necessary to recover the waste heat of the wet and hot waste gas and the condensed water. Some of the existing waste heat recovery technologies condense the wet and hot waste gas to dehumidify, filter it, and then return it to the dryer to recover the heat of the wet and hot waste gas; some use the wet and hot waste gas to heat fresh air, or use the wet and hot air to produce hot water to recover the waste heat of the wet and hot waste gas; some use condensed water to heat fresh air to recover the waste heat of the condensed water. Although the existing waste heat recovery technology recovers the waste heat of the dryer to a certain extent, either the quality of the produced hot water is too low or the waste heat is not fully recovered. Utility Model Content

[0003] In view of the fact that the quality of hot water is too low and the waste heat is not fully recovered in the prior art, the utility model provides a waste heat recovery and energy-saving system for a textile steam dryer, which can improve the quality of hot water and further recover the waste heat of condensed water.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A waste heat recovery and energy-saving system for a textile steam dryer, comprising: a dryer, a high-temperature air source heat pump, a flash tank and a steam ejector;

[0006] Among them, fresh steam is connected to the dryer through a first pipeline; the fresh steam is connected to the steam ejector through a second pipeline; the dryer is connected to the high-temperature air source heat pump through a third pipeline; the high-temperature air source heat pump is connected to the flash tank through a fourth pipeline; the flash tank is connected to the steam ejector through a fifth pipeline; the dryer is connected to the flash tank through a sixth pipeline; the flash tank is connected to the high-temperature air source heat pump through a seventh pipeline; the steam ejector is connected to the dryer through an eighth pipeline.

[0007] The waste heat recovery and energy-saving system for the textile steam dryer as described above further includes a fresh air heater, the flash tank is connected to the fresh air heater through a ninth pipeline, the dryer is connected to the fresh air heater through a tenth pipeline, and the fluids in the ninth pipeline and the tenth pipeline are heat exchanged in the fresh air heater.

[0008] As described above, the waste heat recovery and energy-saving system for the textile steam dryer, further, the high-temperature air source heat pump includes a circulation loop formed by connecting an evaporator, a condenser, a compressor and a throttle valve, and the third pipeline is connected to the evaporator of the high-temperature air source heat pump.

[0009] As described above, in the waste heat recovery and energy-saving system for a textile steam dryer, further, the third pipeline is provided with a filter box, and the filter box is arranged upstream of the evaporator.

[0010] As described above, the waste heat recovery and energy-saving system for a textile steam dryer, further, the second pipeline is provided with a first steam valve.

[0011] As described above, the waste heat recovery and energy-saving system for a textile steam dryer, further, the first pipeline is provided with a second steam valve and a temperature and pressure reduction valve.

[0012] The waste heat recovery and energy-saving system for a textile steam dryer as described above, further, the eighth pipeline is provided with a third steam valve.

[0013] In the waste heat recovery and energy-saving system for a textile steam dryer as described above, further, the refrigerant of the high-temperature air source heat pump is R245FA or R1233ZD or R1234ZE.

[0014] As described above, in the waste heat recovery and energy-saving system for a textile steam dryer, further, the tenth pipeline supplies air from the bottom of the dryer, and a hood is provided at the air supply port.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] 1. The utility model not only effectively increases the inlet temperature of fresh air and the drying efficiency of the dryer through the cascade utilization and integrated optimization of the waste heat of humid waste gas and the waste heat of condensed water, but also converts the waste heat into high-quality steam through a high-temperature heat pump, thereby effectively reducing the consumption of fresh steam.

[0017] 2. Textile mills have a huge demand for steam, but not much demand for hot water below 80°C produced by ordinary heat pumps. Using high-temperature heat pumps to recover waste heat from humid waste air can effectively reduce the use of fresh steam and reduce the company's steam costs.

[0018] 3. The condensed water and the steam-water mixture produced by the condenser are sent to the flash tank to produce steam, which can effectively recover the steam leaked from the steam trap. In addition, the flash tank with condensed water replenishment replaces the traditional tap water replenishment, and there is no need to use the refrigerant of the high-temperature air source heat pump condenser to heat the water replenishment, which can achieve high-quality utilization of the high-temperature refrigerant of the high-temperature air source heat pump condenser.

[0019] 4. Using the condensed water after steam recovery to heat fresh air can greatly increase the air's moisture absorption capacity, speed up the drying efficiency of the dryer, and further recover the waste heat of the condensed water. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of a waste heat recovery and energy-saving system for a textile steam dryer according to the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of the high-temperature air source heat pump of the utility model.

[0023] In the figure: 1. Dryer; 2. High-temperature air source heat pump; 3. Flash tank; 4. Fresh air heater; 5. Steam ejector; 6. Filter box; 21. Evaporator; 22. Condenser; 23. Compressor; 24. Throttle valve; 11. First steam valve; 12. Second steam valve; 13. Third steam valve; 14. Temperature and pressure reduction valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] Example:

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" in the embodiments of the utility model and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] See also Figure 1 to Figure 2 , the present embodiment provides a waste heat recovery and energy-saving system for a textile steam dryer, which includes: a dryer 1, a high-temperature air source heat pump 2, a flash tank 3 and a steam ejector 5; specifically, fresh steam is connected to the dryer 1 through a first pipeline; the fresh steam is connected to the steam ejector 5 through a second pipeline; the dryer 1 is connected to the high-temperature air source heat pump 2 through a third pipeline; the high-temperature air source heat pump 2 is connected to the flash tank 3 through a fourth pipeline; the flash tank 3 is connected to the steam ejector 5 through a fifth pipeline; the dryer 1 is connected to the flash tank 3 through a sixth pipeline; the flash tank 3 is connected to the high-temperature air source heat pump 2 through a seventh pipeline; the steam ejector 5 is connected to the dryer 1 through an eighth pipeline.

[0029] In the above embodiment, fresh steam circulates in the first and second pipelines, hot and humid exhaust gas circulates in the third pipeline, water vapor mixture circulates in the fourth pipeline, low-pressure steam circulates in the fifth pipeline, condensed water circulates in the sixth pipeline, high-temperature hot water circulates in the seventh pipeline, and medium-pressure steam circulates in the eighth pipeline.

[0030] As an optional implementation, the second pipeline is provided with a first steam valve 11. The first pipeline is provided with a second steam valve 12 and a temperature and pressure reduction valve 14. The eighth pipeline is provided with a third steam valve 13.

[0031] In the system provided by the above embodiment, the condensed water from the dryer 1 is first sent to the flash tank 3 together with the water vapor mixture produced by the condenser 22 of the high-temperature air source heat pump 2 to produce steam, and the outlet steam above the flash tank 3 is sent to the steam ejector 5 to mix with the fresh steam to the pressure required by the process, and part of the high-temperature hot water below the flash tank 3 returns to the condenser 22 of the high-temperature air source heat pump 2, and part is sent to the fresh air heater 4 to heat the fresh air. The dryer 1 is also provided with a bypass pipe to introduce fresh steam, and a temperature reduction and pressure reduction valve 14 is provided on the bypass pipe.

[0032] The high temperature air source heat pump 2 uses the hot and humid exhaust gas discharged from the dryer 1 as the low temperature heat source, and the hot and humid exhaust gas is sent to the evaporator 21 of the high temperature air source heat pump 2 to heat and evaporate the refrigerant. The exhaust gas from the evaporator 21 is discharged into the atmosphere. The temperature of the low temperature heat source is above 60°C, and the refrigerant of the high temperature air source heat pump 2 is R245FA, and can also be R1233ZD and R1234ZE.

[0033] In the system provided by the above embodiment, this embodiment not only effectively improves the inlet temperature of fresh air and the drying efficiency of the dryer 1 through the cascade utilization and integrated optimization of the residual heat of the wet and hot waste gas and the residual heat of the condensed water, but also converts the waste heat into high-quality steam through the high-temperature heat pump, thereby effectively reducing the consumption of fresh steam. The textile factory has a very large demand for steam, and the demand for hot water below 80°C produced by ordinary heat pumps is not much. The use of high-temperature heat pumps to recover the residual heat of the wet and hot waste air can effectively reduce the amount of fresh steam and reduce the steam cost of the enterprise. The condensed water and the steam-water mixture produced by the condenser 22 are sent to the flash tank 3 to produce steam, which can effectively recover the steam leaked from the steam trap. Moreover, the flash tank 3 is replenished with condensed water to replace the traditional tap water replenishment, and there is no need to use the refrigerant of the condenser 22 of the high-temperature air source heat pump 2 to heat the water, which can achieve high-quality utilization of the high-temperature refrigerant in the condenser 22 of the high-temperature air source heat pump 2. Heating fresh air with the condensed water after steam recovery can greatly increase the moisture absorption capacity of the air, accelerate the drying efficiency of the dryer 1, and realize further recovery of the residual heat of condensed water.

[0034] In one embodiment, a fresh air heater 4 is further included, the flash tank 3 is connected to the fresh air heater 4 through a ninth pipeline, the dryer 1 is connected to the fresh air heater 4 through a tenth pipeline, and the fluids in the ninth pipeline and the tenth pipeline perform heat exchange in the fresh air heater 4. After being heated, the fresh air is supplied from the bottom of the dryer 1 through an air supply pipe, and a hood is provided at the air supply port, so that the hot air is more evenly distributed at the bottom of the dryer 1.

[0035] In one embodiment, the high-temperature air source heat pump 2 includes a circulation loop formed by connecting an evaporator 21, a condenser 22, a compressor 23 and a throttle valve 24, and the third pipeline is connected to the evaporator 21 of the high-temperature air source heat pump 2. The high-temperature air source heat pump 2 uses the hot and humid exhaust gas discharged from the dryer 1 as a low-temperature heat source, and the hot and humid exhaust gas is sent to the evaporator 21 of the high-temperature air source heat pump 2 to heat and evaporate the refrigerant. The exhaust gas from the evaporator 21 is discharged into the atmosphere. The temperature of the low-temperature heat source is above 60°C, and the refrigerant of the high-temperature air source heat pump 2 is R245FA, and can also be R1233ZD and R1234ZE.

[0036] In one embodiment, the third pipeline is provided with a filter box 6, and the filter box 6 is arranged upstream of the evaporator 21. The wet hot exhaust gas is filtered through the filter box 6 before entering the high-temperature heat pump, and the filter box is equipped with two layers of filter screens. An automatic brush is installed next to the filter screen to automatically clean the impurities such as fluff on the filter screen.

[0037] The working process of the utility model is as follows:

[0038] Start the dryer 1, close the first steam valve 11 and the third steam valve 13, open the second steam valve 12, and the fresh steam is sent to the dryer 1 after being cooled and decompressed by the decompression valve 14 on the bypass pipe;

[0039] After the dryer 1 is running, the hot and humid exhaust gas is filtered by the filter box 6 and then sent to the evaporator 21 to provide a heat source. The liquid refrigerant in the evaporator 21 absorbs heat and becomes a gaseous refrigerant. The gaseous refrigerant is compressed into a high-temperature and high-pressure refrigerant by the compressor 23. The high-temperature and high-pressure refrigerant is sent to the condenser 22 to provide a heat source for high-temperature hot water. The high-temperature hot water is vaporized and sent to the flash tank 3 for flash evaporation. The low-pressure steam is sent to the steam ejector 5 from the top of the flash tank 3. The first steam valve 11 and the third steam valve 13 are opened. The low-pressure steam and the fresh steam produce medium-pressure steam through the steam ejector 5. The medium-pressure steam is sent to the dryer 1. At the same time, the second steam valve 12 and the temperature and pressure reduction valve 14 on the fresh steam bypass pipe are closed.

[0040] The condensed water from the dryer 1 is also sent to the flash tank 3 to collect the residual steam in the condensed water. Part of the high-temperature hot water from the bottom of the flash tank 3 is sent to the condenser 22 of the high-temperature air source heat pump 2 to produce steam, and part of it is sent to the fresh air heater 4 to heat fresh air. The heated fresh air is sent to the dryer 1 through the air supply pipe;

[0041] After the dryer 1 is running stably, the second steam valve 12 and the temperature and pressure reducing valve 14 are always in the closed state. The waste heat recovery work of the dryer 1 enters the next cycle.

[0042] In the method provided in the above embodiment, this embodiment not only effectively improves the inlet temperature of fresh air and the drying efficiency of the dryer through the cascade utilization and integrated optimization of the residual heat of wet and hot waste gas and the residual heat of condensed water, but also converts the waste heat into high-quality steam through a high-temperature heat pump, thereby effectively reducing the consumption of fresh steam. The textile factory has a very large demand for steam, and the demand for hot water below 80°C produced by ordinary heat pumps is not much. Using a high-temperature heat pump to recover the residual heat of wet and hot waste air can effectively reduce the amount of fresh steam and reduce the steam cost of the enterprise. The condensed water and the steam-water mixture produced by the condenser are sent to the flash tank to produce steam, which can effectively recover the steam leaked from the steam trap. Moreover, the flash tank with condensed water replenishment replaces the traditional tap water replenishment, and there is no need to use the refrigerant of the high-temperature air source heat pump condenser to heat the water replenishment, which can achieve high-quality utilization of the high-temperature refrigerant of the high-temperature air source heat pump condenser. Heating fresh air with the condensed water after steam recovery can greatly increase the moisture absorption capacity of the air, accelerate the drying efficiency of the dryer, and realize further recovery of the residual heat of condensed water.

[0043] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable ordinary technicians in the field to understand the content of the utility model and implement it accordingly, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the essence of the content of the utility model should be included in the protection scope of the utility model.

Claims

1. A waste heat recovery and energy-saving system for a textile steam dryer. It is characterized in that include: dryers, high temperature air source heat pumps, flash tanks and steam ejectors; Among them, fresh steam is connected to the dryer through a first pipeline; the fresh steam is connected to the steam ejector through a second pipeline; the dryer is connected to the high-temperature air source heat pump through a third pipeline; the high-temperature air source heat pump is connected to the flash tank through a fourth pipeline; the flash tank is connected to the steam ejector through a fifth pipeline; the dryer is connected to the flash tank through a sixth pipeline; the flash tank is connected to the high-temperature air source heat pump through a seventh pipeline; the steam ejector is connected to the dryer through an eighth pipeline.

2. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that A fresh air heater is also included. The flash tank is connected to the fresh air heater through a ninth pipeline. The dryer is connected to the fresh air heater through a tenth pipeline. The fluids in the ninth pipeline and the tenth pipeline perform heat exchange in the fresh air heater.

3. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that The high-temperature air source heat pump includes a circulation loop formed by connecting an evaporator, a condenser, a compressor and a throttle valve, and the third pipeline is connected to the evaporator of the high-temperature air source heat pump.

4. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 3, It is characterized in that The third pipeline is provided with a filter box, and the filter box is arranged upstream of the evaporator.

5. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that The second pipeline is provided with a first steam valve.

6. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that The first pipeline is provided with a second steam valve and a temperature and pressure reducing valve.

7. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that The eighth pipeline is provided with a third steam valve.

8. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 1, It is characterized in that The refrigerant of the high-temperature air source heat pump is R245FA or R1233ZD or R1234ZE.

9. The waste heat recovery and energy-saving system for a textile steam dryer according to claim 2, It is characterized in that The tenth pipeline supplies air from the bottom of the dryer, and a hood is provided at the air supply port.

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