TWI591303B - Heat recovery storage - Google Patents

Description

Heat recovery storage device

The present invention relates to a heat recovery storage device, and more particularly to a heat recovery device which is low in cost, high in safety, and excellent in heat exchange efficiency.

The conventional heat recovery storage device, as shown in FIG. 1, mainly includes a main container 10 having a heat exchange medium (which may be purified water) and a heat exchanger 20 disposed outside the main container 10. The front side of the main container 10 is provided with at least a hot water outlet 104 having a higher position, a hot water inlet 103 located at the middle portion, and a cold water inlet 101 and a cold water outlet 102 having a lower position. The heat exchanger 20 has at least one of the foregoing. a cold end inlet 201 communicating with the cold water outlet 102, a hot end outlet 202 communicating with the hot water inlet 103, and a heat source inlet 203 connected to the waste heat source 4 (which can be introduced into waste heat) and a heat source outlet capable of exporting waste heat 204.

When the above structure is in operation, the heat exchanger 20 can be introduced into the external waste heat source 4 by the heat source inlet 203, while the water flowing out of the cold water outlet 102 of the main container 10 can be exchanged by the cold end inlet 201 through a pump M. In the device 20, the heat energy introduced into the heat exchanger 20 is absorbed to become hot water of high temperature, and then the hot water is discharged from the hot end outlet 204 and flows into the main container 10 through the cold water inlet 203. A flow cycle of cold and hot water may be formed, and at the same time, hot water inside the main container 10 may flow out from the hot water outlet 104 for external (battery stack), and the hot water is cooled after external application. It is then returned to the main container 10 by the cold water inlet 101; however, this structure has the following drawbacks in practical use:

1. Since the heat exchanger 20 is disposed outside the main container 10, heat is easily lost during transportation, resulting in a decrease in heat recovery efficiency.

2. Since the heat exchanger 20 is disposed outside the main container 10, a connected pipe must be provided between the two, which not only increases the cost of the construction but also increases the volume thereof.

3. Since the connecting pipe is provided between the heat exchanger 20 and the main container 10, the overall structure is complicated, and it is not easy to connect and expand.

4. In order to avoid boiling of the hot water caused by the heat exchanger 20 itself being overheated, the heating temperature of the main container 10 (about 70 to 75 ° C) is often limited, so that the application is also limited.

5. Longer heat exchange path causes excessive pressure loss on the low temperature side, and it is difficult to form a natural circulation. It is necessary to use forced circulation to avoid overheating of the cold end outlet, resulting in additional power consumption and ineffective performance.

6. The long heat exchange path causes the high temperature side pressure loss to be too large, causing excessive back pressure on the battery stack and the burner of the front end fuel cell, which limits the application.

In view of the above-mentioned shortcomings of the heat recovery storage device, the inventors have made research on the improvement of these disadvantages, and finally the present invention has been produced.

The main object of the present invention is to provide a heat recovery storage device which replaces a conventional external shell-and-tube heat exchanger with an in-line plate heat exchanger, wherein the plate heat exchanger has a small volume and a low pressure loss, and the inside is matched. The in-line combination can effectively improve the overall heat exchange efficiency.

Another object of the present invention is to provide a heat recovery storage device which directly installs a low-pressure-loss plate heat exchanger in the device, so that natural circulation can be performed without additional circulation pumping and external pipe fittings, and no energy consumption is required at all. Under the conditions, the heat can be stored by itself, which greatly improves the overall efficiency of the SOFC. In addition, the low-pressure loss design can eliminate the difficulty of high back pressure on the operation of the front-end equipment of the system to improve the reliability of the equipment.

It is still another object of the present invention to provide a heat recovery storage device that utilizes a cold-end outlet temperature of a heat exchanger for bypass gas release control to perform partial heat exchange to avoid partial boiling, and when a preset water temperature is reached , can completely isolate the hot air, does not make the heat exchanger empty, has excellent Safety, while eliminating the need for a pressure relief valve on the heat exchanger end, reduces production costs and increases safety.

The technical means adopted by the present invention include: a main container having an accommodating space for storing a heat exchange medium, and at least one hot water outlet and one cold water outlet on the front side of the main container; The heat exchanger is disposed in the accommodating space of the main container. The heat exchanger has at least one heat source inlet extending to the outside of the accommodating space, and the heat source inlet is connected to a waste heat source.

According to the above structure, the heat exchanger has two cold end inlets and a hot end outlet facing the inside of the accommodating space. In a preferred embodiment of the invention, the height of the hot end outlet to the bottom of the manifold is preferably from 15 cm to 25 cm.

According to the above structure, the heat source inlet of the heat exchanger is further connected to a condenser.

According to the above structure, the condenser and the heat source outlet of the heat exchanger are respectively connected to a temperature control valve, and the temperature control valve performs the outgassing control by the heat source outlet temperature feedback of the heat exchanger.

As for the detailed construction, application principle, function and effect of the present invention, a complete understanding can be obtained by referring to the following description according to the drawings:

1, 10‧‧‧ main container

11, 101‧‧‧ cold water inlet

12, 104‧‧‧ hot water outlet

102‧‧‧ cold water outlet

103‧‧‧ hot water inlet

2, 20‧‧ ‧ heat exchanger

21, 201‧‧‧ cold end entrance

22, 202‧‧‧ hot end exit

221‧‧‧hot end outlet manifold bottom

23, 203‧‧‧ heat source entrance

24, 204‧‧‧ heat source export

241, 31‧‧‧ temperature control valve

3‧‧‧Condenser

4‧‧‧ Waste heat source

M‧‧‧ pump

Figure 1 is a schematic view showing the structure of a heat recovery storage device.

Figure 2 is a schematic view showing the construction of the present invention.

Referring to FIG. 2, the structure of the present invention mainly includes: a main container 1, a heat exchanger 2, and the like, wherein the main container 1 contains a heat exchange medium (which may be clean water) inside the front side of the main container 1. At least one hot water outlet 12 having a higher position and a cold water inlet 11 having a lower position are provided; the heat exchanger 2 is disposed inside the main container 1, and the heat exchanger 2 has an extension outside the main container 1. a heat source inlet 23 and a heat source outlet 24 are simultaneously connected to an external waste heat source 4 and one end of a condenser 3, and the other end of the condenser 3 is provided with a temperature control valve 31, the heat source A temperature control valve 241 is disposed on the outlet 24, and the heat exchanger 2 is further provided with a cold end inlet 21 for supplying heat exchange medium (clean water) into the interior of the main container 1, and a heat exchange medium (net). Water) exits the hot end outlet 22. In a preferred embodiment of the invention, the height of the hot end outlet 22 to the hot end outlet manifold bottom 221 is preferably from 15 cm to 25 cm.

In practical applications, the heat exchanger 2 can be introduced into the external waste heat source 4 by the heat source inlet 23, and the heat exchange medium (purified water) inside the main tank 1 can enter the heat exchanger 2 directly via the cold end inlet 21. To absorb the waste heat energy introduced into the heat exchanger 2 to become a high temperature fluid (water), and then the high temperature fluid (water) flows back into the main vessel 1 from the hot end outlet 22 to make the main vessel 1 interior The heat exchange medium (purified water) gradually rises in temperature and forms a heat exchange cycle of cold and hot water flow; during the heat exchange cycle, a temperature sensing element can be disposed at the heat source outlet 24 of the heat exchanger 2. (not shown), in order to detect the temperature of the heat source outlet 24, and then separately control the temperature control valve 31 and the temperature control valve 241 to perform a gas release (heat removal) operation, thereby controlling the heat exchange in the main container 1. The medium (purified water) maintains an accurate working temperature.

If there is a need for module expansion, the plurality of main containers 1 can be directly connected to each other in parallel with the hot water outlet 12 and the cold water inlet 11, so that the main containers 1 can be internally connected to achieve a larger capacity heat exchange. The effect of storage.

The above structure of the present invention has the following features: 1. The design of the present invention by placing the heat exchanger 2 in the main container 1 eliminates the need for external piping design, saves space and reduces cost, and reduces heat loss. And improve efficiency. 2. The invention can realize safe and efficient heat energy recovery operation by using a simple temperature control switch, and is designed to be fully heat exchanged with the heat exchange medium (clean water) in the main container 1, and is not easy to make the water boil. Increase the maximum water temperature. 3. Due to the simplified overall structure (single container), it is easy to carry out modular expansion, the expansion module can be built with heat exchanger 2 or without heat exchanger 2 (empty container), until each main container 1 reaches the highest water temperature, and then bypasses outgassing. 4. Due to its simple structure and convenient operation, the overall failure rate and low risk are suitable for various types of heat energy recovery, and it has the characteristics of low cost, safety and reliability, and is easy to be commercialized and highly accepted by the client. 5. The invention can carry out natural circulation in the container, and does not need additional forced driving energy consumption, has economical and environmental protection characteristics; and the hot end pressure loss is extremely low, and can be used for a device with large back pressure limitation, and has wide application range. .

As apparent from the above, the heat recovery storage device of the present invention has the effects of reducing cost, improving heat exchange efficiency, and improving safety, and has industrial useability, novelty, and advancement.

The above description is only a preferred embodiment of the invention and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made by the scope of the patent application of the present invention are covered by the scope of the invention.

1‧‧‧ main container

11‧‧‧ cold water inlet

12‧‧‧hot water outlet

2‧‧‧ heat exchanger

21‧‧‧ cold end entrance

22‧‧‧hot end exit

23‧‧‧Hot source entrance

24‧‧‧Hot source export

241, 31‧‧‧ temperature control valve

3‧‧‧Condenser

4‧‧‧ Waste heat source

Claims (4)

A heat recovery storage device comprising at least: a main container having an accommodating space for storing a heat exchange medium, at least one hot water outlet and a cold water inlet on the front side of the main container; and a heat exchanger disposed at the main In the accommodating space of the container, the main container has at least one heat source inlet extending to the outside of the accommodating space, and the heat source inlet is connected to a waste heat source; wherein the heat source inlet and the heat exchanger hot end outlet are connected to each other a tube to maintain at least a certain height difference between the hot end outlet and the heat source inlet to prevent local boiling in the heat exchanger. The heat recovery storage device of claim 1, wherein the heat exchanger has a cold end inlet and a hot end outlet facing the inside of the accommodating space, wherein the height of the hot end outlet to the bottom of the manifold is 15 Centimeters to 25 cm. The heat recovery storage device of claim 1, wherein the heat source inlet of the heat exchanger is further connected to a condenser. The heat recovery storage device of claim 1, wherein the condenser and the heat source outlet of the heat exchanger are respectively connected to a temperature control valve, and the temperature control valve is returned by the heat source outlet temperature of the heat exchanger. Conduct gas release control.