Cab cooler by applied R515B in the steel mill

Abstract

The present invention provides a cap cooler for a steel plant using high-temperature R515B refrigerant, comprising a cabin with an evaporator located on the upper part of a ceiling crane in a steel plant and an outdoor unit with a condenser located thereon; wherein the refrigerant of the refrigerant system formed by the evaporator and condenser is R515B; wherein the discharge refrigerant of the compressor forming the refrigerant system passes through an oil separator, passes through the condenser of the outdoor unit, passes through a receiver, passes through a filter dryer, passes through a sight glass, and a portion of the liquid refrigerant is branched, passes through a solenoid valve and an injection to spray the liquid refrigerant, thereby cooling the motor inside the compressor, converting it into a gaseous refrigerant, and then being drawn back into the compressor; and the remaining refrigerant is supplied to an electronic expansion valve, converting it into a low-temperature, low-pressure refrigerant, passing through the evaporator inside the cabin, thereby creating a comfortable air environment for the worker. This is because the evaporation temperatures of R22 and R410a, which are widely used as air conditioner refrigerants, are not suitable for the ambient conditions where the air temperature of a steel plant is approximately 100°C, but since the present invention uses the refrigerant R515B, which has a relatively high condensation temperature, it has a favorable effect on the air environment of the cabin room of a steel plant. In addition, by adopting R515B refrigerant and adding an injection function to address the problem of subcooling on the evaporator outlet side that may occur, the liquid refrigerant in the compressor suction side is converted into gaseous refrigerant, thereby increasing the efficiency of the refrigerant cycle. In addition, to solve the problem where the efficiency of the refrigerant cycle is reduced and the evaporation and condensation temperatures of the refrigerant cycle become unstable due to excessive air temperature conditions inside the steel mill, an electronic expansion valve is connected to the control unit to stabilize the unstable evaporation and condensation temperatures, and the operation is controlled to correspond to preset evaporation and condensation temperatures.

Description

Technology Field

[0001] The present invention relates to a cap cooler for a steel plant for high-temperature refrigerant R515B, wherein the indoor temperature of the high-temperature steel plant is a significant temperature environment of around 100°C, and the working environment inside the cabin where the worker works is very poor because it is located above the overhead crane, so in order to create an appropriate cabin environment, a high-temperature refrigerant must be applied to the air conditioner, and at the same time, a refrigerant system to which a high-temperature refrigerant is applied is applied, and a refrigerant system suitable for the significant high-temperature environment of the steel plant is applied. Background Technology

[0002] In general, overhead cranes are widely used as conveying equipment in iron and steel plants.

[0003] Because the internal temperature of the cabin of such overhead cranes rises from 40°C to 90°C during the summer due to the working environment, the working conditions for workers deteriorate and problems such as various errors in the operation of the equipment occur.

[0004] In order to improve these problems, conventional overhead crane cabin coolers, also known as cab coolers, are being applied, which consist of a compressor, a condenser, an expansion valve, and an evaporator to form a cooling cycle while circulating refrigerant.

[0005] Overhead crane cabin coolers play an important role in improving efficiency by providing a comfortable environment for workers inside the cabin, while also ensuring smooth operation of various electrical components.

[0006] However, the indoor air temperature of a steel mill where a blast furnace and produced hot iron ore are located is around 100°C, and it is very difficult to form a supply temperature from an evaporator suitable for workers inside a cabin using conventional refrigerants suitable for air temperatures that are approximately two to three times higher than the outdoor air temperature of a conventionally used air conditioner. Furthermore, as for conventional patented technologies, Patent No. 10-1085034 and Patent No. 10-1821383 both relate to technologies for providing positive pressure to a cabin or clearing air accumulated in a steel mill in a condenser, and do not relate to refrigerant systems that correspond to the high air temperatures of a steel mill. Therefore, there is an urgent need to apply high-temperature refrigerants suitable for the high temperatures of a steel mill, and also an urgent need to develop an optimal refrigerant system that adapts to the high air temperatures provided to the evaporator. Prior art literature

[0007] Korean Patent Publication No. 10-1821383 Korean Patent Publication No. 10-1085034 The problem to be solved

[0008] The present invention was devised to solve the above-mentioned problems, and the objective of the present invention is to provide a cap cooler for a steel plant using a high-temperature refrigerant, which applies a refrigerant system that applies a high-temperature refrigerant and simultaneously applies a refrigerant system suitable for the high-temperature environment of the steel plant, as the indoor temperature of the high-temperature steel plant is a significant temperature environment of around 100°C, and the working environment inside the cabin where the worker works is very poor, so in order to create an appropriate cabin environment, a high-temperature refrigerant must be applied to the air conditioner. means of solving the problem

[0009] The present invention provides a cap cooler for a steel plant using high-temperature R515B refrigerant as a means to solve the above-mentioned problems. The invention comprises a cabin with an evaporator located on the upper part of a ceiling crane in a steel plant and an outdoor unit with a condenser located thereon; the refrigerant of the refrigerant system formed by the evaporator and condenser is R515B; the discharge refrigerant of the compressor forming the refrigerant system passes through an oil separator and the condenser of the outdoor unit, passes through a receiver and a filter dryer, passes through a sight glass, and a portion of the liquid refrigerant is branched, passes through a solenoid valve and an injection to spray liquid refrigerant, which then sprays and cools the motor inside the compressor, converts into a gaseous refrigerant, and is then sucked back into the compressor; the remaining refrigerant is supplied to an electronic expansion valve, converted into a low-temperature, low-pressure refrigerant, passes through the evaporator inside the cabin, and creates a comfortable air environment for the worker. Effects of the invention

[0010] As seen above, the evaporation temperatures of R22 and R410a, which are widely used as air conditioner refrigerants, are not suitable for the surrounding conditions where the air temperature of a steel plant is approximately 100°C. However, since the present invention uses R515B, a refrigerant with a relatively high condensation temperature, it has a favorable effect on the air environment of the cabin room of a steel plant.

[0011] In addition, by adopting R515B refrigerant and adding an injection function to address the problem of subcooling on the evaporator outlet side that may occur, the liquid refrigerant in the compressor suction side is converted into gaseous refrigerant, thereby increasing the efficiency of the refrigerant cycle.

[0012] In addition, to solve the problem where the efficiency of the refrigerant cycle is reduced and the evaporation and condensation temperatures of the refrigerant cycle become unstable due to excessive air temperature conditions inside the steel mill, an electronic expansion valve is connected to the control unit to stabilize the unstable evaporation and condensation temperatures, and the operation is controlled to correspond to preset evaporation and condensation temperatures. Brief explanation of the drawing

[0013] FIG. 1 is a schematic diagram showing a cap cooler for a steel plant for high-temperature refrigerant of R515B according to the present invention. FIG. 2 is a schematic diagram showing a capillary and orifice type injection according to the present invention. FIG. 3 is a schematic diagram showing a cap cooler for a steel plant for a high-temperature R515B refrigerant located on a ceiling train of a steel plant according to the present invention. Specific details for implementing the invention

[0014] Before describing various embodiments of the present invention in detail, it will be understood that the application is not limited to the details of the configuration and arrangement of components described in the following detailed description or illustrated in the drawings. The present invention may be embodied and practiced in other embodiments and may be carried out in various ways. Furthermore, it will be understood that the expressions and terms used herein regarding device or element orientations (e.g., "front," "back," "up," "down," "top," "bottom," "left," "right," "lateral") are used merely to simplify the description of the present invention and do not indicate or imply that the related device or element must simply have a specific orientation. Additionally, terms such as "first" and "second" are used in this and the appended claims for illustrative purposes and are not intended to indicate or imply relative importance or intent.

[0015] The present invention has the following features to achieve the above objective.

[0016] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe his invention, they should be interpreted in a meaning and concept consistent with the technical spirit of the present invention.

[0017] Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0018] Looking at an embodiment according to the present invention, a cabin (200) with an evaporator (10) and an outdoor unit (210) with a condenser (50) are installed on the upper part of a ceiling crane (400) of a steel plant, and the refrigerant of the refrigerant system (300) formed by the evaporator (10) and the condenser (50) is formed as R515B; the discharge refrigerant of the compressor (30) forming the refrigerant system (300) passes through an oil separator (40) and the condenser (50) of the outdoor unit (210), passes through a receiver (60) and a filter dryer (70), passes through a sight glass (80), and some of the liquid refrigerant is branched and passes through a solenoid valve (90) and an injection (91) to spray liquid refrigerant, thereby spraying and cooling the motor (35) inside the compressor (30), converting it into a gaseous refrigerant, and then sucking it back into the compressor (30); The remaining refrigerant is supplied to an electronic expansion valve (100), converted into a low-temperature, low-pressure refrigerant, passes through an evaporator (10) inside the cabin (200), and is configured to create a comfortable air environment for the worker; the control unit (500) is configured to adjust the opening of the electronic expansion valve (100) so that the evaporation temperature of the evaporator (10) and the condensation temperature of the condenser (50) correspond to the evaporation temperature and condensation temperature set in advance; the refrigerant supplied from the electronic expansion valve (100) to the evaporator (10) and the remaining liquid refrigerant are branched; and are formed to be further branched into a refrigerant injected into the compressor (30) via the injection (91) and a refrigerant supplied to the outlet side of the evaporator (10) via a separate injection (92). The above injection (91) is formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant tube, functions as a normal expansion valve when the refrigerant passes through, is converted into a low-temperature, low-pressure refrigerant, and has an injection valve (91a) attached in the middle so that the amount of liquid refrigerant injected is controlled through the control unit (500);The injection (92) is also formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant pipe, functions as a normal expansion valve when the refrigerant passes through, and is converted into a low-temperature, low-pressure refrigerant, and an injection valve (92a) is attached in the middle and connected to the outlet side of the evaporator (10), so as to be mixed with the liquid refrigerant coming out of the evaporator (10) and converted back into a gaseous state before being sucked into the compressor (30); the evaporation pressure (p1) and temperature (T1) are measured at the outlet side of the evaporator (10), and the degree of subcooling and superheating are calculated based on the data stored in the control unit (500) for the evaporation temperature corresponding to the evaporation pressure, and when the degree of subcooling is less than or equal to the preset degree of subcooling, the respective injection valves (91a, 92a) are opened or closed to spray liquid refrigerant from the respective injections (91, 92) so as to reach the preset degree of subcooling range; This relates to a cap cooler for a steel mill for high-temperature R515B refrigerant.

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[0039] Hereinafter, a cap cooler for a steelmaking plant for a high-temperature refrigerant of R515B according to the present invention will be described in detail with reference to FIGS. 1 to 3.

[0040] The invention relates to a cap cooler for a steel plant for high-temperature refrigerants, which applies a refrigerant system that applies high-temperature refrigerants and simultaneously applies a refrigerant system suitable for the high-temperature environment of the steel plant. This is because the indoor temperature of the high-temperature steel plant is located at the top of the overhead crane and the working environment inside the cabin where the worker works is very poor, so in order to create an appropriate cabin environment, a high-temperature refrigerant must be applied to the air conditioner.

[0041] Generally, the evaporation temperatures of R22 and R410a, which are widely used as air conditioner refrigerants, are not suitable for the ambient conditions where the air temperature of a steel plant is approximately 100°C, so the present invention uses the refrigerant R515B, which has a relatively high condensation temperature.

[0042] R515B refrigerant is non-toxic, non-explosive, and non-flammable (A1) with a low GWP, and can be used to replace R134a and R1234ze (E) refrigerants in medium-temperature applications, air conditioning, heat pumps, process air conditioning, and process heating.

[0043] R515B is a mixed refrigerant of 91.1% R1234ze(E) and 8.9% R227ea, classified as Class A1 according to DIN EN378-1, meaning it is non-flammable and non-toxic. In terms of thermodynamics, R515B is similar to pure R1234ze(E), and the mixed R227ea suppresses flammability. In terms of refrigeration capacity and performance, it is almost identical to pure R1234ze(E), and notably, R515B has a GWP (Global Warming Potential) of 299, which is 80% lower than that of R134a.

[0044] In addition, the characteristics of the R515B refrigerant mentioned above are particularly suitable for screw compressor applications where R134a is currently used but cannot be changed to flammable refrigerants or refrigerants with low GWP, such as R1234ze(E) or R1234yf.

[0045] The present invention has technical features in applying R515B refrigerant to a refrigerant system, and

[0046] The refrigerant system to which this is applied is as follows.

[0047] As shown in Fig. 3, generally

[0048] A cabin (200) with an evaporator (10) and an outdoor unit (210) with a condenser (50) are installed on the upper part of the ceiling crane (400) of the steel plant.

[0049] The discharge refrigerant of the compressor (30) forming the refrigerant system (300) formed by the evaporator (10) and condenser (50) of the present invention passes through the oil separator (40) and the condenser (50) of the outdoor unit (210), passes through the receiver (60) and the filter dryer (70), passes through the sight glass (80), and some of the liquid refrigerant is branched and passes through the solenoid valve (90) and the injection (91) to spray the liquid refrigerant, thereby spraying and cooling the motor (35) inside the compressor (30), converting it into a gaseous refrigerant, and then being sucked back into the compressor (30).

[0050] The present invention adopts R515B refrigerant, thereby addressing the problem of subcooling at the evaporator outlet that may occur by adding an injection function to inject the liquid refrigerant at the compressor suction side, converting the suction liquid refrigerant of the compressor into gaseous refrigerant, and thus increasing the efficiency of the refrigerant cycle.

[0051] The present invention relates to a cap cooler for a steel plant for high-temperature R515B refrigerant, wherein, as a technical feature of the invention, the remaining refrigerant of the refrigerant that is branched and spray-cooled by the motor of the compressor is supplied to an electronic expansion valve (100), converted into low-temperature low-pressure refrigerant, passes through an evaporator (10) inside the cabin (200), and is configured to create a comfortable air environment for the worker.

[0052] The function of the above electronic expansion valve (100) is described in detail as follows.

[0053] In order to solve the problem where the efficiency of the refrigerant cycle is reduced and the evaporation and condensation temperatures of the refrigerant cycle become unstable due to excessive air temperature conditions inside the steel mill, an electronic expansion valve is connected to the control unit to stabilize the unstable evaporation and condensation temperatures, and the system includes a function to operate in response to preset evaporation and condensation temperatures.

[0054] To this end, the control unit (500) is configured to adjust the opening degree of the electronic expansion valve (100) so that the evaporation temperature of the evaporator (10) and the condensation temperature of the condenser (50) correspond to the preset evaporation temperature and condensation temperature.

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[0057] In addition, as shown in FIG. 2, as another embodiment of the present invention,

[0058] The above injection (91) is formed in the shape of a capillary tube with a narrower diameter than the refrigerant tube, functions as a normal expansion valve when the refrigerant passes through, is converted into a low-temperature, low-pressure refrigerant, and has an injection valve (91a) attached in the middle so that the amount of liquid refrigerant sprayed is controlled through the control unit (500).

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[0061] In addition, as another embodiment of the present invention, it is characterized by including a compressor suction side and branching and spraying to a plurality of other refrigerant pipes.

[0062] An injection (92) and an injection valve (92a), separate from the compressor suction side, are additionally connected to the outlet side of the evaporator (10) to mix with the liquid refrigerant coming out of the evaporator (10) and to convert the refrigerant back into a gaseous state before being sucked into the compressor (30).

[0063] This adds a function to the compressor suction side injection system that increases compressor efficiency by additionally injecting liquid refrigerant when the evaporation and condensation temperatures are higher than preset temperatures, thereby converting all the refrigerant drawn into the compressor suction side into gaseous refrigerant.

[0064] As shown in FIGS. 1 and 2, this can be summarized as follows. There is a refrigerant that passes through the condenser (50) and receiver (60), and is supplied to the evaporator (10) via the electronic expansion valve (100), and some of the liquid refrigerant is branched. As a technical feature of the present invention, the branched liquid refrigerant is further branched into two refrigerant pipes. The two refrigerant pipes are a refrigerant that is injected into the compressor (30) via an injection (91) and a refrigerant that is supplied to the outlet side of the evaporator (10) via a separate injection (92). Here, the injection (91) is formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant tube, functions as a normal expansion valve when the refrigerant passes through, converts into a low-temperature, low-pressure refrigerant, and has an injection valve (91a) attached in the middle so that the amount of liquid refrigerant injected is controlled through the control unit (500). Additionally, the injection (92) is also formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant tube, functions as a normal expansion valve when the refrigerant passes through, converts into a low-temperature, low-pressure refrigerant, has an injection valve (92a) attached in the middle, is connected to the outlet side of the evaporator (10), mixes with the liquid refrigerant coming out of the evaporator (10), and converts the refrigerant back into a gaseous state before being sucked into the compressor (30). Furthermore, as another embodiment of the present invention,

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[0066] By measuring the evaporation pressure (p1) and temperature (T1) at the outlet side of the above evaporator (10),

[0067] The evaporation temperature corresponding to the above evaporation pressure is calculated based on the data of R515B stored in the control unit (500) for the degree of subcooling and superheating, and

[0068] If the calculated subcooling and superheating degrees are less than or equal to the preset subcooling and superheating degrees,

[0069] The above injection valves (91a, 92a) are opened to spray liquid refrigerant from the injection (91, 92) so as to reach a preset range of supercooling and superheating.

[0070] Typically, the standard subcooling and superheating degrees are within 5 to 10°C. As a technical feature of the present invention, when the subcooling degree is negative, the refrigerant state discharged from the evaporator outlet is a mixture of liquid and gaseous phases. Even in this case, the refrigerant is precisely sprayed from a capillary-shaped injection (91, 92) to increase the performance of the cooling efficiency.

[0071] In addition, the opening rate of the injection valves (91a, 92a) is controlled by the control unit (500) to control the amount of refrigerant injected, thereby increasing the performance of the cooling efficiency despite the high air temperature inside the steel plant.

[0073] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto and it is obvious that various modifications and changes are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0074] 10: Evaporator 30: Compressor 35: Motor 40: Oil separator 50: Condenser 60: Receiver 70: Filter dryer 80: Sight glass 90: Solenoid valve 91, 92: Injection 91a: Injection valve 100: Electronic expansion valve 200: Kevin 210: Outdoor unit 300: Refrigerant system 400: Overhead crane 500: Control unit

Claims

Claim 1 A cabin (200) with an evaporator (10) and an outdoor unit (210) with a condenser (50) are installed on the upper part of a ceiling crane (400) of a steel mill, and the refrigerant of the refrigerant system (300) formed by the evaporator (10) and the condenser (50) is formed as R515B; the discharge refrigerant of the compressor (30) forming the refrigerant system (300) passes through an oil separator (40) and the condenser (50) of the outdoor unit (210), passes through a receiver (60) and a filter dryer (70), passes through a sight glass (80), and some of the liquid refrigerant is branched and passes through a solenoid valve (90) and an injection (91) to spray liquid refrigerant, thereby spraying and cooling the motor (35) inside the compressor (30), converting it into a gaseous refrigerant, and then sucking it back into the compressor (30); The remaining refrigerant is supplied to an electronic expansion valve (100), converted into a low-temperature, low-pressure refrigerant, passes through an evaporator (10) inside the cabin (200), and is configured to create a comfortable air environment for the worker; the control unit (500) is configured to adjust the opening of the electronic expansion valve (100) so that the evaporation temperature of the evaporator (10) and the condensation temperature of the condenser (50) correspond to the evaporation temperature and condensation temperature set in advance; the refrigerant supplied from the electronic expansion valve (100) to the evaporator (10) and the remaining liquid refrigerant are branched; and are formed to be further branched into a refrigerant injected into the compressor (30) via the injection (91) and a refrigerant supplied to the outlet side of the evaporator (10) via a separate injection (92). The above injection (91) is formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant tube, functions as a normal expansion valve when the refrigerant passes through, is converted into a low-temperature, low-pressure refrigerant, and has an injection valve (91a) attached in the middle so that the amount of liquid refrigerant injected is controlled through the control unit (500);The injection (92) is also formed in the shape of a capillary tube with a diameter narrower than that of the refrigerant pipe, functions as a normal expansion valve when the refrigerant passes through, and is converted into a low-temperature, low-pressure refrigerant, and an injection valve (92a) is attached in the middle and connected to the outlet side of the evaporator (10), so as to be mixed with the liquid refrigerant coming out of the evaporator (10) and converted back into a gaseous state before being sucked into the compressor (30); the evaporation pressure (p1) and temperature (T1) are measured at the outlet side of the evaporator (10), and the degree of subcooling and superheating are calculated based on the data stored in the control unit (500) for the evaporation temperature corresponding to the evaporation pressure, and when the degree of subcooling is less than or equal to the preset degree of subcooling, the respective injection valves (91a, 92a) are opened or closed to spray liquid refrigerant from the respective injections (91, 92) so as to reach the preset degree of subcooling range; Cap cooler for a steel mill for high-temperature R515B refrigerant, characterized by being formed. Claim 2 delete Claim 3 delete Claim 4 delete

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