Two-stage regulation control device

Abstract

The utility model provides a two-stage regulation control device, which belongs to the technical field of sludge drying and comprises a refrigerant circulating system, and the refrigerant circulating system comprises a compressor, a condensing mechanism, a plate heat exchanger, a filter, a throttling device, an evaporator and a gas-liquid separator which are sequentially connected. The air circulation system comprises a drying chamber, and an upper fan, a lower fan, a first-layer mesh belt, a second-layer mesh belt and a third-layer mesh belt are arranged in the drying chamber; the cooling water system is a two-stage adjusting assembly and comprises a surface air cooler, a plate heat exchanger, a first proportional valve and a second proportional valve; the problems of pipeline breakage, compressor liquid impact and the like caused by frequent start and stop can be avoided, the high pressure and the low pressure of a refrigerant system can be adjusted, a unit can stably run within an efficient range all the time, the temperature of air entering a heat pump can be adjusted, an evaporator is in a high latent heat ratio state all the time, and system power consumption is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sludge drying, in particular to a two-stage regulating control device. Background Art

[0002] Sludge drying is one of the most effective methods for rapid sludge volume reduction. It is the key to sludge reduction and harmless treatment, and the prerequisite for resource utilization. Therefore, sludge belt low-temperature drying equipment is needed to dry the sludge.

[0003] At present, most of the sludge belt low-temperature drying equipment on the market, when in use, has a small amount of sludge input (low load), the heat consumption of sludge evaporation is reduced, the return air temperature of the drying chamber is very likely to exceed the set temperature, the compressor will start and stop frequently, and the equipment performance fluctuates greatly; when the outdoor ambient temperature is too high and the sludge inlet temperature is high, the heat consumption of sludge water evaporation is reduced, the heat in the drying chamber cannot be effectively discharged, and it is very easy to cause the compressor to report high pressure.

[0004] The consequences of this phenomenon include: The compressor experiences significant vibration upon startup, and frequent startups can easily crack pipelines. Liquid hammer is also very likely to occur during startup, directly damaging the compressor. Frequent high-pressure alarms also shorten the compressor's lifespan, especially in the harsh operating conditions of sludge drying.

[0005] Therefore, the present application provides a two-stage regulation control device to solve the above technical problems. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a two-stage regulating control device to solve the problem that the compressor of the existing sludge belt type low-temperature drying equipment is prone to frequent start and stop during use, causing adverse effects such as pipeline rupture and compressor liquid hammer.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A two-stage regulating control device, comprising:

[0009] A refrigerant circulation system, comprising a compressor, a condensing mechanism, a plate heat exchanger, a filter, a throttling device, an evaporator and a gas-liquid separator connected in sequence, for circulating the refrigerant, wherein the condensing mechanism comprises an upper condenser and a lower condenser;

[0010] An air circulation system includes a drying chamber equipped with an upper fan, a lower fan, a first-layer mesh belt, a second-layer mesh belt, and a third-layer mesh belt, configured to transfer heat and mass between the high-temperature, low-humidity air and the wet sludge on the mesh belt in the drying chamber, evaporating the moisture in the sludge and condensing and discharging the moisture in the sludge in cooperation with a condensing mechanism;

[0011] The cooling water system is a two-stage regulating component, including a surface cooler, a plate heat exchanger, a first proportional valve and a second proportional valve, which is used to respectively regulate the high pressure of the refrigerant circulation system and the temperature of the air entering the heat pump through cooling water. The cooling water system includes two water inlet routes: one for entering the plate heat exchanger to exchange heat with the refrigerant, and the other for entering the surface cooler to exchange heat with the circulating air.

[0012] As a further preferred solution, the output end of the compressor is connected in series with the upper condenser and the lower condenser, the output end of the lower condenser is connected to the input end of the plate heat exchanger, the output end of the plate heat exchanger is connected to the input end of the filter, the output end of the filter is connected to the input end of the throttling device, the output end of the throttling device is connected to the input end of the evaporator, the output end of the evaporator is connected to the input end of the gas-liquid separator, and the output end of the gas-liquid separator is connected to the input end of the compressor, forming a refrigerant cycle.

[0013] As a further preferred embodiment, a refrigerant cycle of low-temperature low-pressure refrigerant vapor, high-temperature high-pressure refrigerant vapor, medium-temperature low-pressure refrigerant liquid, low-temperature low-pressure refrigerant liquid, and low-temperature low-pressure condensing agent vapor is formed in the refrigerant cycle system.

[0014] As a further preferred embodiment, the air circulation system is divided into an upper circulation system corresponding to the upper condenser and a lower circulation system corresponding to the lower condenser, and both the upper circulation system and the lower circulation system are used to transfer heat and mass between the high-temperature and low-humidity air and the wet sludge on the mesh belt in the drying chamber, evaporate the moisture in the sludge, and cooperate with the condensing mechanism to condense and discharge it;

[0015] As a further preferred solution, the upper circulation system includes the upper fan and the first layer of mesh belt arranged at the upper end of the drying chamber, and the lower circulation system includes the lower fan, the third layer of mesh belt and the second layer of mesh belt arranged at the lower end of the drying chamber, and the lower circulation system is also equipped with a heat regenerator.

[0016] As a further preferred solution, one path of cooling water in the cooling water system enters the plate heat exchanger through the first proportional valve to exchange heat with the refrigerant, and another path of cooling water in the cooling water system enters the surface cooler through the second proportional valve to exchange heat with the circulating air.

[0017] As a further preferred solution, the cooling water from the two heat exchange paths in the cooling water system are mixed together and release heat to the environment by entering a cooling tower.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] In the above solution, thanks to the refrigerant circulation system formed by the compressor, condensing mechanism, plate heat exchanger, filter, throttling device, evaporator and gas-liquid separator, combined with the two-stage regulation of the two-stage regulation component, problems such as pipe rupture and compressor liquid hammer caused by frequent starting and stopping can be avoided;

[0020] At the same time, thanks to the setting of the cooling water system, through the relevant settings of the two-stage adjustment components, and in conjunction with the air circulation system, the high and low pressures of the refrigerant system can be adjusted, so that the unit can always operate stably within the high-efficiency range, and the air temperature entering the heat pump can be adjusted so that the evaporator is always in a high latent heat ratio state, reducing system power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the invention and, together with the description, further serve to explain the principles of the invention and enable those skilled in the relevant art to make and use the invention.

[0022] Figure 1 It is a structural diagram of a two-stage regulating control device;

[0023] Figure 2 It is a structural diagram of a two-stage regulating component;

[0024] 1. Compressor; 2. Upper condenser; 201. Lower condenser; 3. Two-stage regulating assembly; 301. Surface cooler; 302. Plate heat exchanger; 303. First proportional valve; 304. Second proportional valve; 4. Filter; 5. Throttling device; 6. Evaporator; 7. Gas-liquid separator; 8. Regenerator; 9. Drying chamber; 901. Upper fan; 902. Lower fan; 903. First-layer mesh belt; 904. Second-layer mesh belt; 905. Third-layer mesh belt.

[0025] As shown in the figure, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, devices and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0026] The following describes a two-stage regulating control device provided by the present invention in detail with reference to the accompanying drawings and specific embodiments. It is also noted that, in order to provide a more detailed description, the following embodiments are best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement the invention for some known technologies. Furthermore, the accompanying drawings are only for the purpose of describing the embodiments in more detail and are not intended to limit the present invention in any specific manner.

[0027] It should be noted that references in the specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," etc. indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes such specific features, structures, or characteristics. In addition, when specific features, structures, or characteristics are described in conjunction with an embodiment, it is within the knowledge of persons skilled in the relevant art to implement such features, structures, or characteristics in conjunction with other embodiments (whether or not explicitly described).

[0028] In general, terms can be understood, at least in part, from their use in context. For example, depending at least in part on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey an exclusive set of factors, but can instead, depending at least in part on the context, allow for the presence of other factors that are not necessarily explicitly described.

[0029] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” means not only “directly on” something but also includes the meaning of being “on” something with intervening features or layers, and “on” or “above” means not only “on” or “above” something but also includes the meaning of being “on” or “above” something with no intervening features or layers.

[0030] Additionally, spatially relative terms such as "below," "beneath," "lower," "above," and "upper" may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as illustrated in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein should be similarly interpreted accordingly.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a two-stage regulating control device, including a refrigerant circulation system, an air circulation system and a cooling water system.

[0032] Refrigeration cycle system: The refrigerant cycle system includes a compressor 1, a condensing mechanism, a plate heat exchanger 302, a filter 4, a throttling device 5, an evaporator 6, and a gas-liquid separator 7, which are connected in sequence, and is used to circulate the refrigerant, and the condensing mechanism includes an upper condenser 2 and a lower condenser 201. The output end of the compressor 1 is connected in series with the upper condenser 2 and the lower condenser 201, the output end of the lower condenser 201 is connected to the input end of the plate heat exchanger 302, the output end of the plate heat exchanger 302 is connected to the input end of the filter 4, the output end of the filter 4 is connected to the input end of the throttling device 5, the output end of the throttling device 5 is connected to the input end of the evaporator 6, the output end of the evaporator 6 is connected to the input end of the gas-liquid separator 7, and the output end of the gas-liquid separator 7 is connected to the input end of the compressor 1, forming a refrigerant cycle.

[0033] During actual use of this embodiment, the low-temperature, low-pressure refrigerant vapor is compressed into high-temperature, high-pressure refrigerant vapor in the compressor 1 and enters the upper condenser 2 and the lower condenser 201 in sequence. The high-temperature, high-pressure refrigerant vapor releases heat to the circulating air in the upper condenser 2 and the lower condenser 201, and then condenses into medium-temperature, low-pressure refrigerant liquid and enters the plate heat exchanger 302. In the plate heat exchanger 302, the medium-temperature, low-pressure refrigerant liquid determines whether it needs to exchange heat with cooling water according to control conditions (in this embodiment, if the high-pressure side pressure of the refrigerant system is higher than 2.5 MPa, the first proportional valve 303 is adjusted to control the high pressure of the refrigerant system). Then, the impurities in the system are filtered through the filter 4, and the refrigerant is throttled and reduced in pressure through the throttling device 5 to become a low-temperature, low-pressure refrigerant liquid and enter the evaporator 6. The low-temperature, low-pressure refrigerant liquid absorbs heat and evaporates into low-temperature, low-pressure refrigerant vapor in the evaporator 6 and then enters the gas-liquid separator 7. The low-temperature, low-pressure refrigerant vapor is separated from a small amount of refrigerant liquid in the gas-liquid separator 7 and then enters the compressor 1, thereby completing the refrigerant cycle.

[0034] In the above process, in the refrigerant circulation system, the refrigerant in the upper condenser 2 and the lower condenser 201 releases heat to the circulating air, the refrigerant in the evaporator 6 absorbs heat from the circulating air, and the plate heat exchanger 302 adjusts the high pressure of the refrigerant system.

[0035] Air circulation system: The air circulation system includes a drying chamber 9, in which an upper fan 901, a lower fan 902, a first-layer mesh belt 903, a second-layer mesh belt 904 and a third-layer mesh belt 905 are provided. The air circulation system is used to transfer heat and mass between the high-temperature and low-humidity air and the wet sludge on the mesh belt in the drying chamber 9, evaporate the moisture in the sludge and condense and discharge it in conjunction with the condensation mechanism. Specifically, the air circulation system is divided into an upper circulation system corresponding to the upper condenser 2 and a lower circulation system corresponding to the lower condenser 201. The upper circulation system includes the upper fan 901 and the first-layer mesh belt 903 located at the upper end of the drying chamber 9, while the lower circulation system includes the lower fan 902, the third-layer mesh belt 905, and the second-layer mesh belt 904 located at the lower end of the drying chamber 9. Both the upper and lower circulation systems are used to transfer heat and mass between the high-temperature, low-humidity air and the wet sludge on the mesh belt within the drying chamber 9, evaporating the moisture in the sludge and condensing it for discharge in conjunction with the condensation mechanism. In this embodiment, the lower circulation system is also equipped with a regenerator 8.

[0036] During the actual use of this embodiment, the upper circulation system is driven by the upper fan 901 to complete the circulation. The high-temperature and low-humidity air that absorbs the heat of the refrigerant and is heated in the upper condenser 2 passes through the upper fan 901 and enters a layer of mesh belt 903. After heat and mass transfer with the wet sludge on the mesh belt, it becomes medium-temperature and high-humidity air and then mixes with the medium-temperature and high-humidity air of the lower circulation to enter the heat pump system. After entering the heat pump system, part of the air continues to enter the upper condenser 2 to complete the upper circulation system.

[0037] The lower circulation system is driven by the lower fan 902 to complete the circulation. The high-temperature and low-humidity air that absorbs the heat of the refrigerant and isohumidified in the lower condenser 201 passes through the lower fan 902 and enters the three-layer mesh belt 905 and the second-layer mesh belt 904 in turn. After heat and mass transfer with the wet sludge on the mesh belt, it becomes medium-temperature and high-humidity air and then mixes with the medium-temperature and high-humidity air in the upper circulation and enters the heat pump system. After entering the heat pump system, another part enters the surface cooler 301, and it is determined whether it needs to exchange heat with the cooling water according to the control conditions (in this embodiment, if the air temperature entering the heat pump system is higher than 65°C (settable), the second proportional valve 304 is adjusted to control the air temperature), and then enters the regenerator 8. The air in the regenerator 8 that has passed through the surface cooler 301 exchanges heat and cools down with the low-temperature air that has been cooled and dehumidified by the evaporator 6 (isohumidification cooling, increasing the relative humidity of the air entering the evaporator 6, thereby improving the latent heat ratio of heat exchange in the evaporator 6, and reducing the cooling capacity required to remove air moisture).

[0038] Then it enters the evaporator 6, and the refrigerant in the evaporator 6 absorbs the heat in the medium-temperature and high-humidity air, and the temperature of the medium-temperature and high-humidity air decreases. At the same time, the water vapor releases heat and condenses into water. The cooled and dehumidified air enters the regenerator 8 and exchanges heat with the air passing through the surface cooler 301 to increase its temperature (isothermal heating, recovering air heat, and reducing the amount of heat that the heat pump needs to provide during the sludge dehumidification process), and then enters the lower condenser 201 to complete the lower circulation system.

[0039] Therefore, the air circulation system mainly uses high-temperature, low-humidity hot air to evaporate the water in the sludge in the drying chamber 9, and then condenses the evaporated water in the evaporator 6 and discharges it from the equipment, ultimately achieving the purpose of sludge drying.

[0040] Cooling water system: The cooling water system is a two-stage regulating component 3, including a surface cooler 301, a plate heat exchanger 302, a first proportional valve 303 and a second proportional valve 304, which is used to respectively adjust the high pressure of the refrigerant circulation system and the air temperature entering the heat pump through cooling water, and the cooling water system includes two water inlet routes for entering the plate heat exchanger 302 to exchange heat with the refrigerant, and entering the surface cooler 301 to exchange heat with the circulating air, wherein one cooling water enters the plate heat exchanger 302 through the first proportional valve 303 to exchange heat with the refrigerant, and the other cooling water of the cooling water system enters the surface cooler 301 through the second proportional valve 304 to exchange heat with the circulating air, and the two cooling waters after heat exchange are mixed together and release heat to the environment by entering the cooling tower.

[0041] During the actual use of this embodiment, the cooling water inlet is divided into two routes. One route passes through the first proportional valve 303 and enters the plate heat exchanger 302 to exchange heat with the refrigerant (regulating the high pressure of the refrigerant system), and then mixes with the cooling water after heat exchange in the other route and enters the cooling tower to release heat to the environment; the other route passes through the second proportional valve 304 and enters the surface cooler 301 to exchange heat with the circulating air (regulating the temperature of the air entering the heat pump), and then mixes with the cooling water after heat exchange in the first route and enters the cooling tower to release heat to the environment.

[0042] Therefore, the cooling water system mainly regulates the high pressure of the refrigerant system and the temperature of the air entering the heat pump through cooling water, ultimately making the system operate stably and reliably within a wider range of operating conditions.

[0043] This invention encompasses any alternatives, modifications, equivalents, and solutions that do not depart from the spirit and scope of this invention. To provide a thorough understanding of this invention, specific details are described in detail in the following preferred embodiments of this invention, but those skilled in the art will be able to fully understand this invention without these detailed descriptions. Furthermore, to avoid unnecessary confusion regarding the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A two-stage regulating control device, characterized in that: include: A refrigerant circulation system, comprising a compressor (1), a condensing mechanism, a plate heat exchanger (302), a filter (4), a throttling device (5), an evaporator (6), and a gas-liquid separator (7) connected in sequence, for circulating the refrigerant, and the condensing mechanism comprising an upper condenser (2) and a lower condenser (201); An air circulation system, the air circulation system comprising a drying chamber (9), wherein an upper fan (901), a lower fan (902), a first-layer mesh belt (903), a second-layer mesh belt (904), and a third-layer mesh belt (905) are provided in the drying chamber (9), for transferring heat and mass between the high-temperature and low-humidity air and the wet sludge on the mesh belt in the drying chamber (9), evaporating moisture in the sludge and cooperating with a condensing mechanism to condense and discharge the moisture; A cooling water system, the cooling water system is a two-stage regulating component (3), including a surface cooler (301), a plate heat exchanger (302), a first proportional valve (303) and a second proportional valve (304), for regulating the high pressure of the refrigerant circulation system and the temperature of the air entering the heat pump respectively through cooling water, and the cooling water system includes two water inlet routes, one for entering the plate heat exchanger (302) to exchange heat with the refrigerant, and the other for entering the surface cooler (301) to exchange heat with the circulating air.

2. The dual-stage regulating control device according to claim 1, characterized in that: The output end of the compressor (1) is connected in series with the upper condenser (2) and the lower condenser (201), the output end of the lower condenser (201) is connected to the input end of the plate heat exchanger (302), the output end of the plate heat exchanger (302) is connected to the input end of the filter (4), the output end of the filter (4) is connected to the input end of the throttling device (5), the output end of the throttling device (5) is connected to the input end of the evaporator (6), the output end of the evaporator (6) is connected to the input end of the gas-liquid separator (7), and the output end of the gas-liquid separator (7) is connected to the input end of the compressor (1), forming a refrigerant cycle.

3. The dual-stage regulating control device according to claim 2, characterized in that: A refrigerant cycle of low-temperature low-pressure refrigerant vapor, high-temperature high-pressure refrigerant vapor, medium-temperature low-pressure refrigerant liquid, low-temperature low-pressure refrigerant liquid, and low-temperature low-pressure condensing agent vapor is formed in the refrigerant cycle system.

4. The dual-stage regulating control device according to claim 1, characterized in that: The air circulation system is divided into an upper circulation system corresponding to the upper condenser (2) and a lower circulation system corresponding to the lower condenser (201), and both the upper circulation system and the lower circulation system are used to transfer heat and mass between the high-temperature and low-humidity air and the wet sludge on the mesh belt in the drying chamber (9), evaporate the moisture in the sludge, and condense and discharge it in conjunction with the condensation mechanism.

5. The dual-stage regulating control device according to claim 4, characterized in that: The upper circulation system includes the upper fan (901) and the first-layer mesh belt (903) arranged at the upper end of the drying chamber (9), and the lower circulation system includes the lower fan (902), the third-layer mesh belt (905) and the second-layer mesh belt (904) arranged at the lower end of the drying chamber (9). The lower circulation system is also equipped with a heat regenerator (8).

6. The dual-stage regulating control device according to claim 1, characterized in that: One path of cooling water in the cooling water system enters the plate heat exchanger (302) through the first proportional valve (303) to exchange heat with the refrigerant, and another path of cooling water in the cooling water system enters the surface cooler (301) through the second proportional valve (304) to exchange heat with the circulating air.

7. The dual-stage regulating control device according to claim 6, characterized in that: The cooling water from the two heat exchange paths in the cooling water system is mixed together and releases heat into the environment by entering the cooling tower.

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