JPH0733957B2 - Particle circulation heat exchange method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat exchange method for collecting heat from the atmosphere, and more specifically, when collecting heat from the atmosphere in a cold region where the outside air temperature is below freezing. The present invention relates to a suitable particle circulation heat exchange method.

[Conventional technology and its problems]

In a cold region where the outside air temperature is below freezing, if a fin-tube type heat collecting heat exchanger that is generally used is used, the heat transfer surface is frosted and heat cannot be collected. For this reason, heat is intermittently applied to the heat transfer surface for defrosting, but in this case, reduction in energy efficiency cannot be avoided.

In addition, when heat is collected using a heat exchanger that uses a widely used bubbling fluidized bed heat exchange method, frost formation can be prevented by the action of fluidized particles under some conditions, but pressure loss including the air disperser can be prevented. Is large, which is disadvantageous in terms of energy. Further, the bubbling fluidized bed has a problem that it cannot sufficiently respond to a load change due to a change in outside temperature.

[Problems to be Solved by the Invention]

The present invention solves the problems of the conventional techniques as described above, prevents frost formation on the heat transfer surface, reduces pressure loss, and reduces energy efficiency even in cold regions where the outside air temperature is below freezing. It is an object of the present invention to provide a heat exchange method capable of improving the temperature.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, according to the present invention, a partition wall is provided between the rising portion where the mixed flow of air and circulating particles rises, and a moving layer of circulating particles, and a separator and air exhaust are provided above the moving portion. An air diffusing section having an outlet, a heat transfer member inside the moving bed, a discharge valve in a communication section with the rising section below the moving bed, and an air inlet port below the rising section. Using a particle circulation type heat exchanger having, the air in the atmosphere from the air inlet is taken in as a high-speed upward flow such that the circulating particles supplied into the air are in a turbulent or high-speed fluidized state, Circulating particles are supplied from the moving bed into the high-speed air rising flow while controlling the circulation amount thereof with the discharge valve, and air and circulating particles are generated in the ascending process of the supplied circulating particles and a mixed flow of air. Heat exchange between The mixed flow of particles and air is separated into circulating particles and air while preventing the circulating particles from flowing out to the outside in the air diffusion unit, and the separated air is discharged to the outside from the air discharge port. In addition, there is provided a particle circulation type heat exchange method comprising collecting the separated circulating particles in the moving bed and collecting the heat of the collected circulating particles by a heat transfer body provided in the moving bed.

[Action]

The circulating particles, which are supplied to the ascending section by adjusting the circulation amount from the discharge valve, rise in a turbulent or high-speed fluidized state due to the high-speed air taken in from the air inlet. In the process, heat is exchanged between the air and the circulating particles to collect heat. The mixed flow of air and circulating particles is separated into air and circulating particles in the air diffusing section, the circulating particles flow into the moving bed, and the air is discharged from the outside through the air outlet.

Therefore, a disperser that causes a large pressure loss is not necessary, and the pressure loss of the heat exchanger can be reduced by causing the circulating particles to flow into the moving bed by the air diffusion section without using a cyclone or the like.

The heat-heated circulating particles that have flowed into the moving bed exchange heat with the heat transfer member while moving in the moving bed according to the amount of particle circulation discharged from the discharge valve to the rising portion.

In this case, since the heat exchanger is provided in the moving bed in which the air containing water vapor that causes frost is hardly present, frost does not occur on the heat transfer surface.

〔Example〕

FIG. 1 shows a heat exchanger used in the method of the present invention, in which the body 1 of the heat exchanger installed upright has a rising part 3 and a moving bed 4 which are partitioned by partition walls 2 and above them. An air diffuser 5 is provided, an air inlet 6 opening to the rising portion 3 is provided in the lower portion of the main body 1, and an air outlet 7 is opened above the air diffuser 5, respectively. , 7 are provided with separators 9, 9 for preventing the circulating particles 8 described later from flowing out of the main body.

The moving bed 4 has a heat transfer body 10 in the middle and an opening at the lower end that opens below the rising portion 3, and an exhaust valve 12 for discharging the circulating particles 8 to the rising portion 3 is provided in the opening. It is provided.

The circulating particles 8 are formed of solid particles that are not easily crushed by collision or friction, while the discharge valve 12 can control the amount of circulating particles.

In FIG. 1, → indicates the flow of air and ⇒ indicates the flow of circulating particles 8.

In the present invention, the air to be heat-exchanged is supplied as a high-speed flow into the rising part 3 through the separator 9 installed near the inflow port 6, and the circulating particles 8 are discharged from the discharge valve 12 into the rising part 3. Supplied. In this case, since the separator 9 is installed above the air diffusing unit 5, the circulating particles 8 never flow out to the outside despite the high-speed air flow.

The circulating particles supplied to the rising part 3 are violently mixed and heat-exchanged with air in a turbulent or high-speed fluidized state, and the rising part 3
It rises inside and is carried to the air diffusing section 5, where it is decelerated and separated from the air, and falls onto the moving layer 4. On the other hand, the air is discharged from the discharge port 7 to the outside of the main body.

The circulating particles 8 dropped on the moving layer 4 move to the lower valve side according to the circulation amount discharged from the discharge valve 12, and transfer the heat from the air to the heat transfer body 10 provided in the moving layer 4.

In the above, by adjusting the circulation amount of the particles by the discharge valve 12 and changing the flow velocity of the air, the rising portion 3
By controlling the residence time of the circulating particles 8 in the above, the heat transfer rate is adjusted by this, and it becomes possible to easily cope with the fluctuation of the outside air temperature.

Also, since there is a temperature distribution in the moving direction within the moving bed 4,
The amount of heat exchanged can be increased by causing the fluid inside the heat transfer body 10 to flow countercurrently.

〔The invention's effect〕

According to the present invention, heat is taken from the air in the process of raising the circulating particles as a turbulent flow or a high-speed fluidized state by a high-speed air flow, and heat is exchanged with the heat transfer body in the moving bed. It is possible to improve the energy efficiency of the heat exchanger by collecting heat even from the winter atmosphere of a cold region having a temperature without frost formation on the heat transfer surface and with low pressure loss.

Further, since the residence time of the circulating particles in the rising portion can be controlled by changing the circulating amount of the circulating particles or the flow velocity of the air, it is possible to easily cope with the fluctuation of the outside air temperature.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing a heat exchanger used in the method of the present invention. 3 ... Ascending part, 4 ... Moving layer 5 ... Air diffusing part, 6 ... Air inlet 7 ... Air outlet, 8 ... Circulating particles 10 ... Heat transfer element, 12 ... Exhaust valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Syogo Sayama, Hokkaidou, Sapporo-shi, Hokkaido, Tsukikanto Nijo 17-chome 22-1-1, Hokkaido Industrial Development Laboratory (72) Inventor Hidetoshi Aoki Hachinohe City, Aomori 1 of Daiji 88 (56) Bibliographic Reference Sho 58-82845 (JP, U) Actual 58-116037 (JP, U)

Claims (1)

[Claims] 1. A partition wall is divided into an ascending section where a mixed flow of air and circulating particles rises, and a moving layer of circulating particles,
An air diffusion part having a separator and an air discharge port is provided on the upper side thereof, a heat transfer member is provided inside the moving layer, and an exhaust valve is provided at a communication part with the rising part below the moving layer, and Using a particle circulation type heat exchanger having an air inlet below the ascending portion, the air in the atmosphere from the air inlet is such that the circulating particles supplied into the air are in a turbulent or high-speed fluidized state. Taking in as a high-speed upward flow, supplying circulating particles from the moving bed into the high-speed air upward flow while controlling the circulation amount with the discharge valve, and raising the supplied mixed flow of circulating particles and air. The heat exchange between the air and the circulating particles is performed in the process, and the rising mixed flow of the circulating particles and the air is circulated particles while preventing the outflow of the circulating particles to the outside by the separator in the air diffusion section. Separated into air and minutes The collected air is discharged to the outside through the air outlet, the separated circulating particles are collected in the moving bed, and the heat of the collected circulating particles is collected by a heat transfer body provided in the moving bed. Particle circulation heat exchange method.