JPS62261872A - Manufacture of heating medium by heat pump system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a method for producing an industrial heat medium (hot and cold water). More specifically, the present invention is a method for producing a heat medium using a heat pump system that can cope with temporal fluctuations in demand for hot and cold water. [Prior Art] Conventionally, the production of industrial heat medium has centered on hot water production using boiler steam or steam injection, and direct expansion or cold water production using a refrigerator. Although heat pump systems have attracted attention in recent years and plans are being made to introduce them, they are still in the process of becoming widespread for industrial use. Examples of industrial heat pumps include, for example, the ``FY1980 Research Report on the Rationalization of Energy Use in Low Heat Source Production Processes'' published by the Japan Machinery Federation and the Japan Refrigeration Machine Industry Association. Examples of its use include cultivation facilities, sewerage systems, etc. However, in many cases, heat pumps are used as a heating source, and there are few industrial heat medium production operations on a large scale, and there are also few examples of large-scale and comprehensive use of heat pumps for the production of hot and cold water as a heat medium. However, as a countermeasure against seasonal fluctuations, there are examples of using outside air heat exchangers to process unnecessary hot and cold heat, but when the scale is large, the heat exchangers also have a large capacity, which causes problems in terms of installation space, noise, etc. On the other hand, no system has been considered to deal with temporal fluctuations (excluding seasonal fluctuations) in the use of hot and cold water when using heat media. In particular, there are many heating and cooling processes in the production of photographic materials. For example, heating (including heat retention) includes heating various reaction vessels and additive vessels in the photographic emulsion process, as well as heating air for moisturizing and drying. For cooling, there are various uses such as cooling various cans, dehumidifying drying air, cooling the cold air used to set the emulsion after applying photographic emulsion to a support, and other general indoor air conditioning. It is used. Hot water is mainly used as the heating medium for the heating, but since the required temperature differs depending on each process and reaction vessel, steam from the heating source boiler is blown into the hot water tank for each process to reach the desired temperature. It is used to prepare hot water. In some cases, direct heating using boiler steam from the reaction vessel is also carried out. When applying a photographic emulsion to a support, the sol-gel change of a gelatin solution is utilized, and after being applied to the support, it is immediately gelled by cold air, which is called setting. Furthermore, low-humidity air is used to dry coated emulsions in the photographic industry, but these conditions have a great effect on photographic performance and physical properties, and dry air must be used under strictly controlled conditions. As mentioned above, there are many heating and cooling processes in the photographic industry, and hot and cold water is mainly used as the heat medium. Hot water is usually produced by blowing steam produced by a boiler into tanks installed for each process. Depending on the process, steam may be directly blown into a heat exchanger, such as a heating jacket, for heating, but this is generally less controllable than when hot water is used. In the case of cold water, a large capacity cold water tank is installed, and a large amount of cold water is produced by heat exchange of refrigerant with a refrigerator, and this is sent to each process for use. [Problems to be Solved by the Invention] As mentioned in the previous section, heating and cooling in the manufacturing process of photographic light-sensitive materials can be said to be relatively balanced when viewed from a broader perspective. Moreover, the required temperature is about 56°C for hot water and 7°C for cold water, which can be said to be extremely effective conditions for applying a heat pump system. The current system, which uses refrigerators and boilers, takes time to start and stop, and requires manual labor for maintenance. Therefore, operating such a large-capacity refrigerator and boiler separately is significantly inferior to a heat pump system in terms of economy and operation management. Furthermore, it is known that heat exchange using steam is inferior in terms of temperature control, so hot water control is better. However, in actual use, heating and cooling demands are not always balanced. For example, there is a change in the manufacturing type of photographic emulsion, which is called a type changeover, and the timing is different between the emulsion process and the coating process, and there are also changes in air conditioning conditions in summer and winter, and the influence of outside temperature. It is necessary to respond to changes in these heating and cooling demand conditions. The present invention aims to save energy by employing a heat pump system. In particular, in order to make the system work effectively, instead of the traditional individual production of hot water using boiler steam, apart from adjusting the individual temperature conditions of each hot water, basically it is possible to set an efficient temperature and produce a large amount of hot and cold water. The system is to manufacture the products in bulk and send them to each process. For this purpose, heat storage tanks for hot and cold water are provided. Furthermore, the heating and cooling demand in various processes, specifically the amount of hot and cold water used, fluctuates over time and cannot be absorbed by the heat storage tank, making it a comprehensive and effective heat pump. This is a method of manufacturing a heat medium using a system. That is, the first object of the present invention is to save energy by using a heat pump system, in particular to solve the problem of time imbalance in heating and cooling, and to achieve a system that is significantly more economical and manageable than the conventional individual systems using boilers and refrigerators. , to improve efficiency through control. [Means for Solving the Problems] As described above, in the present invention, 1.
By providing separate heating and cooling heat storage tanks for salt water and cold water, we were able to absorb the fluctuations and fully utilize the efficiency of the heat pump system. In addition, a heat exchange system will be introduced in this hot water/cold water supply system, and a hot water circuit will be installed to supply conditioning hot water to the cold water tank in order to deal with temporal fluctuations in demand for hot and cold water, thereby further improving efficiency. I was able to do that. Generally, the amount of heat required per unit time in the production of photographic materials varies considerably. For example, the reduction in the amount of heat required for each process during the product changeover time is very large, and it is not a good idea to cover all of this variation by the size of the heat storage tank. - As an example, fluctuations in demand for heating and cooling as shown in FIG. 5 can be considered. Regarding heating and cooling, as mentioned above, the conditions for heating and keeping warm vary depending on each process, reaction vessel, and addition container. Therefore steam,
Some control by supplementary heat sources in flooded areas is necessary. When considering the balance between cooling and heating, the following four cases can be considered. Warm -+-+ Cold -1++ +: Excess -: Insufficient (1) is undercapacity, and (4) is overcapacity. (2)
, Case (3) may occur over time in the process. Therefore, as mentioned above, it is preferable to use cold heat as a reference since heat requires some control and adjustment is relatively easy. In other words, it is designed to have some leeway in terms of cooling and heating capacity. In addition, the cooling and heating tank is made larger than the heating tank to ensure stable control and sufficient capacity. The extent of this differs depending on the design scale and concept. Therefore, it is sufficient to take measures for cases (3) and (4), including temporal fluctuations. For this reason, the present invention is designed to be a system that can exchange heat between hot and cold water as needed, and is designed to prevent the temperature of cold water from dropping more than necessary, for example, when the demand for cold water temporarily decreases. Furthermore, depending on the use of hot and cold water, hot water may be added to the cold water tank via a valve to maintain the humidity of the cold water tank as necessary. This heat exchange and hot water injection into the cold water tank may be used together or may be used alone. Furthermore, when the temperature of the cold water tank decreases, it is possible to control the flow rate, but this control becomes complicated. Therefore, it is more efficient to maintain the temperature of the cold water tank at a predetermined level when considering its use in various processes. Research on heat storage tanks has been progressing in recent years, and for example, stratified heat storage tanks can also be used. Next, the present invention will be specifically explained with reference to the drawings. FIG. 1 is a system diagram showing a method for producing a heat medium using a heat pump system according to the present invention. [0 is a cold water tank, and 0 is a wet water tank, and each tank is filled with a heat medium, such as water, to be distributed to each process. This water is supplied from pipe 35. A refrigerant evaporating coil 11 and a condensing coil 21 are immersed in the cold water tank and the hot water tank, respectively, and the water in the cold water tank [0 and the hot water tank 20 is cooled and heated by these heat exchanges to make cold water or hot water. The refrigerant gas that has evaporated and released heat in the refrigerant evaporation filter 11 passes through a heat interchanger 31 and is compressed in a compressor 30 that exchanges heat with the cooled refrigerant liquid that has been mixed with a condenser. As a result, the high-temperature gas liquefies and radiates heat in the condenser 21, and the temperature of the hot water in the hot water tank 20 rises. Next, this refrigerant liquid passes through a heat interchanger 31, a liquid reservoir 32, and a cold water tank.

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The humidity in the cold water tank is lowered by evaporating and dissipating heat in the refrigerant evaporation coil 1 in the refrigerant tank. Due to this refrigerant cycle, the tank to,
The water in 20 is cooled and heated to produce cold water and hot water, which serve as heat media, and store and accumulate heat respectively. With a heat pump system like this! The hot and cold water produced is set at a temperature that is efficient for each process and is balanced by the heat pump, but for the reasons mentioned above, it is appropriate to use the cold heat standard in Photo 1. For this reason, when the cooling demand temporarily decreases, that is, when the temperature of the cold water tank 1 falls below the predetermined temperature due to excess cooling, the hot/cold water heat exchanger 34 with built-in cold water delivery pipe 13 and hot water delivery pipe O is used. to adjust the cold water temperature. Of course, the opening degree of the pulp 5.26 can also be automatically adjusted based on the signal from the temperature sensor of the cold water flowing through the cold water delivery pipe 13. If necessary, an appropriate amount of hot water can be fed to the cold water tank by controlling the opening of the cutting valve 24°. This heat exchange and supply of hot water to the cold water tank 0 may be carried out independently or in combination. Of course, when the humidity of the cold water is at a predetermined temperature, the pulps 24 and 26 are closed without performing such an operation, and the pulps 24 and 26 are closed and enters the pipe I3 through the valve 5, and is supplied to each process. In this way, the cold water is kept at a predetermined temperature and the hot water is kept at a certain temperature for each process.
For example, if necessary for humidifying the reaction vessel, an auxiliary heat source such as steam is used. Of course, automation including the use of various sensors can be considered for these controls. Hot water tank 4 has a steam blowing vibrator opening for temperature control if necessary. Figure 2 shows a conventional method, in which hot water and cold water are produced and supplied to the process using steam from the boiler 36 and refrigerant from the refrigerator using a steam pipe. In this case, a considerable amount of heat is wasted from the cooling tower 39. FIG. 3 shows a conventional example in which a heat pump is used for indoor air conditioning. This example is a method of circuit setting the outside air heat exchanger 33 to function as an evaporator or a condenser by performing pulp operation during heating or cooling and circulating hot or cold water, and 12 is a supercooling coil. . [Example] An example in a photosensitive material manufacturing factory is shown below. The humidity in the hot water tank is 56゛''C1 The temperature in the cold water tank is 7℃.A 594 KwH refrigerator will be used as the heat pump, and the capacity will be reduced to approximately 7% of the conventional capacity as a steam boiler as an auxiliary heat source. It was possible to sufficiently absorb and cope with time-series fluctuations.On the other hand, conventionally a 20t boiler unit and a 530 KWH refrigerator unit were used.The energy and cost ratios of these two are shown in Table 1. , Installation 0: FI costs, etc. are shown in Table 2.As can be understood from these data, installation costs, space, and costs can be significantly reduced, and energy conservation can be achieved. There is a demand for cooling, and the required capacity is generally very large.Moreover, the energy for heating and cooling is balanced in a specific axis.Therefore, it is very suitable for the application of a heat pump system.According to the present invention , solves the problem of temporal imbalance in heating and cooling demands in the photographic industry, enables the application of heat pump systems to the photographic industry, and is significantly more economical and manageable than conventional individual systems using boilers and refrigerators. , we were able to improve control efficiency.

[Brief explanation of drawings]

FIG. 1 is a process diagram of the method for producing a heat transfer medium of the present invention,
Figure 2 is a diagram of hot and cold water production in the conventional photographic industry;
The figure is a diagram of another conventional production of hot and cold water using a heat pump system, and FIG. 4 is a graph showing temporal fluctuations in the demand for hot and cold water. 10: Cold water tank 11: Refrigerant evaporation coil 12: Supercooling coil 13: Cold water vibrator 20: i-crystal water tank 21: Condensing coil 2; 3; Wet water pipe 28: Steam blowing pipe 30: Pressure f? I machine (for refrigerant) 33; Outside air heat conversion term 34: Hot and cold water heat exchanger 3G: ; I boiler 38: Refrigerator 39: Cooling tower Applicant Konishiroku Photo Industry Co., Ltd. Figure 2

Claims (3)

[Claims] (1) A method for producing a heat medium using a heat pump system, characterized in that the heat pump system is provided with a heat storage tank for hot and cold water in the process of supplying hot water and cold water for heating and cooling treatments. (2) The method for producing a heat medium according to claim 1, characterized in that a heat exchange system is provided in the hot and cold water supply process. (3) The method for producing a heat medium according to claim 1 or 2, wherein in the hot and cold water supply process, a valve for adding hot water to the cold water tank is provided in the hot water circuit.