JPH0225660A - Heat delivery device - Google Patents

Abstract

PURPOSE:To safely retrieve heat as hot water or steam by incorporating a check valve and a safety valve in the line between the main valve disposed in the fluid supply pipe to the heat exchanger and a cock disposed in the fluid discharge pipe, and providing a bypass pipe which has a stop valve in its way and is connected at its one end to the line ahead of the main valve or behind the cock. CONSTITUTION:The main valve 7 is disposed in the feed water pipe 5 to the heat exchanging section 4, and a cock 8 is disposed in the hot water discharge pipe 6. A safety valve 10 is provided between a check valve 9 disposed on the downstream side of the main valve 7 and said cock 8, and a bypass pipe 11 which is connected to the downstream of the cock 8 at one end has a stop valve 12. Under the normal operating condition, the main valve 7 and cock 8 stay open, and the bypass valve 11 is closed. When water runs at the specified speed through the heat exchanging section 4 of the heating device 2, it receives heat from the heat storage material to become hot water, which is delivered from the hot water discharge pipe 6 at a constant temperature. By changing the opening of the valve to change the flow speed in the heat exchanging section, the temperature of hot water can be changed. Further, by throttling the main valve 7 and opening the cock 8 wide, steam can be delivered at any desired temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat extraction device that heats and extracts fluid flowing through a heat exchange section provided in a heating section that retains thermal energy at a temperature below a certain temperature. Regarding.

As an effective means of utilizing unsteady energy such as industrial waste heat and late-night electricity where there is a time lag between supply and demand, this energy is stored in a heat storage material and a heat exchanger installed in it is used whenever necessary. 2. Description of the Related Art A heat extraction device is known that heats a fluid or a heat medium to be used through a section and extracts the heat stored in the form of a high-temperature fluid.

Such a heat extraction device from a heat storage device utilizes latent heat during solid/liquid phase change of a substance to prevent the temperature of the heat storage material from decreasing as heat is extracted. , it is advantageous to use a latent heat storage device that stores heat at a constant temperature. However, even with a heat storage device that uses sensible heat, if it retains heat at a temperature considerably higher than the temperature of the heating fluid used, it may not be possible to use it for a considerable period of time even if the temperature drops by extracting the heat. I can do it.

Now, in such a heat extraction device from a heat storage device, when the heated fluid is not used, the main valve installed in the fluid supply pipe to the heat exchange section is closed to stop the supply of heated fluid to the heat exchange section. It is common to stop.

However, if the main valve is closed and the fluid does not flow through the heat exchanger, the temperature of the fluid will gradually rise due to the heat of the heat storage material, and if the heat storage temperature is higher than the vaporization temperature of the fluid, the fluid will eventually rise. evaporates, the fluid in the heat exchanger decreases, and a dry-out state is reached. Therefore, the heat of the heat storage device is applied to the tube wall of the heat exchanger, causing it to overheat. When the fluid is supplied to the heat exchanger for next use, a phenomenon occurs in which the fluid rapidly evaporates in contact with the overheated heat exchanger wall. The fluid expands and puts pressure on the tube, which could cause it to break. On the other hand, in order to prevent this, it is necessary to keep the fluid in the heat exchange section at all times, and for this purpose, it is desirable to close the stop valve provided in the fluid extraction pipe. In this case as well, the fluid vaporizes and the pressure within the heat exchange section rises, slowly rising to a point where it is in equilibrium with the heat storage temperature of the heat storage device. Therefore, in order to prevent backflow of fluid, a check valve is provided downstream of the main valve, and the pressure inside the pipe between the check valve and the first check valve is maintained at a high pressure when heat extraction is stopped, but when the next time it is used If the stop valve is opened at times, high-temperature fluid may be pushed out by the vaporized fluid in the pipe and cause an unexpected disaster.

The 11th season has passed! In order to achieve the above object, the present invention provides a heat extraction device from a heat storage device having the above-described configuration, in which a main valve is provided in the fluid supply pipe to the heat exchanger, and a stop valve is provided in the fluid extraction pipe. In addition, a check valve and a safety valve are installed in the pipe line between the main valve and the stop valve, and a stop valve is provided in the middle, and the other end is installed in the pipe line upstream from the main valve or downstream from the stop valve. It is characterized by the provision of connected bypass piping.

Since the heat extraction device of the present invention is constructed as described above, when the extraction of heat is to be stopped, at least the stop valve is closed, and the pipe line therebetween including the heat exchange section is temporarily closed. The liquid becomes a closed space and accumulates. This liquid receives heat from the heat storage material and some of it evaporates, increasing the pressure inside the sealed pipe, but when it reaches equilibrium with the temperature of the heat storage material, evaporation stops. , the liquid stays in the piping and dry-out is avoided.

When restarting operation, slightly open the stop valve installed in the bypass piping to slowly release the pressure to about the supply pressure, and then open the stop valve to prevent the liquid in the heat exchange section from flowing out suddenly. The fluid to be heated flows through the heat exchange section at a predetermined flow rate, and the heated fluid at a predetermined temperature can be taken out.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows the case where the present invention is applied to a heat storage device using late-night electricity and water is used as the heat extraction fluid. The configuration of the embodiment is shown and is shown in normal use.

FIG. 6 is a diagram showing the open and closed states of the valve at the time of stopping and restarting the operation.

A heating device 2 filled with a heat storage material 1 is provided with a heater 3 that generates heat using late-night electricity, and a heat exchange section 4 through which water flows to heat the inside. The heat exchange section 4 is connected to a water supply pipe 5 that supplies water at room temperature and a hot water extraction pipe 6 that is heated and taken out as hot water. The water supply pipe 5 is provided with a main valve 7, and the hot water outlet pipe 6 is provided with a stop valve 8. A check valve 9 is provided downstream of the main valve 7 of the water supply pipe 5, and a safety valve 10 is provided between the check valve 9 and the stop valve 8 of the hot water outlet pipe 6, and the other end is located downstream of the stop valve 8. One end of a bypass pipe 11 connected to is attached.

A stop valve 12 is provided in the bypass pipe 11 .

FIG. 1(a) is a diagram showing the state of this device during normal use. Of the symbols indicating valves, those shown in white are in the open state, and those in black are in the closed state. In the normal state, the main valve 7 And the stop valve 8 is opened, and the bypass valve 11 is closed.

In this state, water flows through the heat exchange part 4 in the heating device 2 at a predetermined flow rate, receives heat from the heat storage material 1 filled in the heating device 2, and becomes hot water from the hot water extraction pipe 6 at a constant temperature. hot water can be taken out.

By changing the opening degree of the valve, the temperature of the hot water taken out can be changed by changing the flow rate within the heat exchange section 4. Again 1
It is also possible to extract steam at an arbitrary temperature by throttling the main valve 7 and widening the stop valve 8.

Next, to stop taking out hot water, all three valves 7, 8, and 11 are closed, as shown in FIG. 1(b). However, depending on the stop period, the main valve 7 may not be closed. In this state, water is trapped in the pipe including the heat exchange section 4 between the check valve 9 and the stop valve 8, but the water is heated by the heat storage material 1 through the heat exchange section 4 and gradually rises. Eventually, a portion of the liquid evaporates and the pressure increases, and when the water vapor pressure reaches a level that is in equilibrium with the heat storage temperature, vaporization stops, and the liquid accumulates in the piping, avoiding dryout.

Of course, if the pressure inside the pipe exceeds a predetermined safety valve setting pressure, the safety valve 10 opens and prevents the pressure from rising above that level.

Next, when restarting the operation, as shown in figure (c), the main valve 7
(while the stop valve 8 is closed), only the bypass valve 12 is slightly opened, and the pressure in the pipe between the valves 7 and 8 is slowly released, reducing it to about the water supply pressure. As a result, the vaporization temperature of the water decreases, and some of the water in the heat exchanger 4 begins to evaporate. However, by opening the main valve 7 and stop valve 8 and supplying water, the temperature decreases and the water is returned to the normal state. to return to. When the normal use state returns, the bypass valve 12 is closed.

In the embodiment shown in FIG. 1, the bypass 11 is provided between one point upstream and one point downstream of the stop valve 8;
) as shown in FIG.
As shown in b), one point on the downstream side of the check valve 9 and one point on the upstream side
1 on the downstream side of the check valve 9.
It is also possible to provide it between the point and one point on the downstream side of the stop valve 8. In short, it is sufficient if the pressure in the pipe between the check valve 9 and the first stop valve 8 can be released to a pipe having a pressure lower than the water supply pressure.

Therefore, the position of the safety valve is not limited to the position shown in Figure 1, and it may be installed anywhere in the piping between it and the check valve 9, and its drain can be drained to a water supply pipe or a drain receiver in the atmosphere, etc. It is also possible.

Note that in the above embodiments, the heat insulating instrumentation accessories and the like of the apparatus are omitted to simplify the explanation. Furthermore, although the above embodiment relates to a heat storage device that uses late-night electricity, it can also be used for industrial heat storage, such as waste heat storage, in which case the heater will be in the form of a heating tube.

Effects As described above, according to the present invention, dryout can be prevented and heat can be safely extracted as hot water or steam.

It goes without saying that the present invention is also applicable to heating fluids other than water.

[Brief explanation of the drawing]

FIGS. 1(a), (b), and (c) show the configuration of an embodiment of the present invention, and also show the operation of the valve during normal use, when stopped, and when restarting operation, respectively, and FIG. 2(a). (b) and (Q) are system diagrams showing other ways of installing bypass piping, respectively. 3... Heater 4... Heat exchanger 5... Water supply pipe (fluid supply pipe) 6... Hot water outlet pipe (fluid outlet pipe) 7... Main valve 8... Stop valve 9. ...Check valve 10...Safety valve 12...Bypass valve 11...Bypass pipe (1 other person) 1...Heat storage material 2...Heating device

Claims (1)

[Scope of Claims] A fluid to be heated is sent from a fluid supply pipe to a heat exchange section provided in a heating section that retains thermal energy at a temperature below a certain temperature, and is heated by the heat exchange section using the thermal energy inside the heating section. In a heat extraction device that extracts heat from a fluid extraction pipe, a main valve is installed in the fluid supply pipe, a stop valve is installed in the fluid extraction pipe, and a check is installed in the pipeline between the main valve and the stop valve. A heat extraction device comprising: a valve, a safety valve, and a bypass pipe having a stop valve in the middle and having the other end connected to a pipe line upstream of the original valve or downstream of the stop valve.