JPS6073219A - Heat accumulation type heating device - Google Patents

Abstract

PURPOSE:To provide a heat accumulation type heating device which heats a room by making use of the solar heat or waste heat by using a latent heat accumulating material that is made up by granular object that generates the heat when adsorbing the moisture. CONSTITUTION:In the case of a heat accumulation operating mode, the air which has been heated by a heater 4 to approximately 100 deg.C passes through a switch valve 9, and is directed to an air inlet 20 of the heating device by a blower 10. The air that flows into a tank 22 moves upward in fluid layers 24, 24 as fine air bubbles via dispersion plates 23, 23 where it takes moisture away from heat accumulating granules as it contacts said granules, and the air eventually flows to an outlet 21 side. The air that has exchanged heat with and has taken the moisture away from the heat accumulating granules in the respective fluid layers flows into a cyclone 13 from the outlet 21 where the granules contained in the air flow are returned to the tank through a pipe 26, and the air is again recirculated to the heater 4. In the case of a heating mode, the air humidified by a humidifier 15 is supplied to the fluid layer 24 where it contacts the heat accumulating granules to allow the granules to adsorb the moisture so as to generate the heat. The air warmed by said heat is supplied to a heater 6 after the heat accumulating granules are removed by the cyclone 13.

Description

Detailed description of the invention (a) Industrial application field This invention uses a latent heat storage material made of granules of a substance that generates heat when it adsorbs moisture, and uses solar heat and waste heat to heat indoor rooms. This invention relates to a heat storage type heating device.

(B) Prior art Substances that generate heat when adsorbing moisture include solutions such as lithium bromide and zinc chloride, and solid substances such as silica gel and alumina, both of which can be used as latent heat storage materials. No attempt has been made to use it.

However, since the solution-type latent heat storage material stores and radiates heat through a heat exchanger, it is difficult to make it using such a heat storage material. Such heating systems have a complicated structure, are prone to liquid leakage and equipment failure, and have the disadvantage of high heating efficiency because they rely mainly on indirect heat exchange.

In addition, although solid latent heat storage materials do not have the disadvantages of M-acid type heat storage materials, they are able to distribute moisture sufficiently even into the interior of the heat storage materials, and they also have a composition that can gradually absorb moisture. However, due to the low thermal conductivity, the rate of heat storage and heat dissipation is slow, which means that the heating performance is poor.

(c) Purpose of the Invention In view of the above points, the present invention improves the heat transfer characteristics between the heating medium that performs heat storage and heat exchange, improves the efficiency of heat storage and heat recovery, and improves the efficiency of heat storage and heat recovery. The purpose of the present invention is to provide a heating device that can supply warm air in a short period of time, and that can store heat for a long time with a simple system.

B) Structure of the Invention The heating device of the present invention uses a solid substance that generates heat when adsorbing moisture as a heat storage material, and forms a fluidized bed of latent heat storage material by granulating such a heat storage material. At times, heated gas is sent to this fluidized bed to remove moisture from the heat storage material, and during heating, the gas with added moisture is introduced into the fluidized bed and from this gas, moisture is added to the heat storage material. It is designed to obtain thermal energy for heating.

(e) Examples A regenerative heating device according to the present invention will be described below with reference to the drawings.

The figure shows a heat source device (4) that obtains heat from a solar heat collector (2), a factory exhaust heat source (3), etc., and hot air is supplied from this heating device (1) to the device (1) of the present invention. Room (5) heater (6)
), in which the equipment is connected by a duct (7), and a switching valve (81 (9)
), the heat obtained by the heat source device (4) is stored in the regenerative heating device (1) or is radiated from the heating device (1) to the heater (6). 00)
021 is a blower for blowing air through the duct (7), 11) is a controller that controls the amount of air blown by this blower Ω゛0), and 021 is an airflow meter that provides control input to the controller (11). (131 is a cyclone that separates solid matter from the air flowing out of the heating device (1) and returns it to the heating device (1), (14) is a filter for air purification, (151 is a humidifier that adds moisture to the air passing through the duct (7).

The heat source device (4) and the solar heat collector (2) are
) is connected to the tube (161) that leads the heat medium (ethylene glycol, dowsum, etc.) heated by the tube (16)
A disposed pump (17) transfers this heat medium to a heat exchanger (I
The air introduced into the duct (7) is heated by circulating between the l19 and the solar heat collector (2).

In addition, the factory exhaust heat source (3+) and the heat source device (1) are connected via a rotating heat storage type heat exchanger α9, etc., and a structure is used that heats the air in the duct (7) without polluting it. .

The heat storage heating device is formed on the tank (22) provided above the outlet (21)', the plurality of air distribution plates □□□ installed in this tank, and this distribution plate CI!3). Fluidized bed of granular heat storage material (
24) It is composed of male.

The granular heat storage material used is silica gel, activated alumina, etc., made into fine sand. A metal mesh (c) is attached to suppress the coalescence and growth of air bubbles formed on the surface.

This metal mesh (two is a fluidized bed formed on a dispersion plate (24
) is a cylindrical wire mesh set up on the dispersion plate (23) at about the same height as the particle layer height when it is at rest. By forming a layer on the dispersion plate (23), the bubbles in the fluidized bed are prevented from coalescing, and the boundary layer between the granular heat storage material and the bubbles is expanded. The heat exchange was previously limited to the vicinity of the dispersion plate, but now active IL heat transfer can occur even in the upper part of the fluidized bed.

In addition, the plurality of dispersion plates (23) (23)... reduce the dead zone that cannot be prevented even if such a metal mesh (21) is disposed in the fluidized bed, and allows the granular heat storage material and air to ,!
7) Make the heat transfer characteristics between the same as above and form a heat storage part
The effective thermal conductivity of layer ii is lower than the conventional 3 to 5 (!!fvC
This improves the performance and stabilizes the functionality of the heat storage heating device.

In the system shown in the figure incorporating the heat storage type heating device 7 of the present invention, its function will be explained below.0 When performing heat storage operation, the air heated to about 100°C by the heat source device (4) is heated to about 100°C by the switching valve ( 9), and is guided to the air inlet (20) of the heating device by the blower (t(l+) and fed to the furnace. At this time, the optimum amount of air is supplied from the blower (10) into the fluidized bed (24). To prevent this, the air flow in the duct (7) is measured with a flow meter (1), and the blower is set to 0 using the controller 01.
Air is blown while adjusting 0). The air flowing into tank C21 passes through the dispersion plate CI! 31 (231...), it becomes fine bubbles and rises through the fluidized bed (231...), comes into contact with the heat storage material particles, removes moisture from these particles, and flows toward the outlet (21). In this way, the air exchanges heat with the particles of the heat storage material in the fluidized bed at each stage, and the air that has been dehydrated is sent to the outlet (2).
After flowing into the cyclone (131) from 11 and returning the particles contained in the air stream from the pipe (a) to the tank, the air is returned to the heat source unit (4), where it is dried and heated. After being regenerated, it is sent again to the thermal storage heating device (1).Alternatively, only the sensible heat of the recirculated air is recovered to outdoor air,
This outdoor air heat source device (4) heats the storage heating device (
1) may be supplied.

By continuing to supply dry, high-temperature air in this manner, the particles of the heat storage material forming the fluidized bed are dried to an equilibrium moisture content, and heat storage is completed.

This heat storage state is maintained until moisture is added to the heat storage material, so if moisture is prevented from entering the tank (221), the heat storage state can be maintained for a long period of time.

Next, when heating operation is performed, the humidifier (I9) is operated, and air with increased humidity is supplied to the fluidized bed C24 via the valve (9) by the blower αQ, and the water content is reduced to near the equilibrium water content. When it comes into contact with the particles of the heat storage material, the particles adsorb moisture and generate heat.

This heat is transferred to the air that has carried moisture, and the warmed air is passed through a cyclone (13) to remove particles of the heat storage material, and then supplied to the heater (6) and then into the room (5). is heated and then returns to the fluidized bed via the humidifier (15) again, repeating the cycle. When supplying air to the fluidized bed (24) in this way, the blower is controlled so that the particles of the heat storage material adsorb moisture at a slow rate, and it is better to prevent the particles from scattering as much as possible. Preferably, the fluidization rate is adjusted.

In this heat storage heating device, when activated alumina is used as the heat storage material, the water content is around the equilibrium water content (0,096 kg water
/i (g, dry air ) (y in a certain fluidized bed 20
It has been confirmed that when humidified air at a temperature of 50°C is passed through, hot air at a temperature of about 50°C can be taken out until the moisture content reaches the limit, indicating that it functions satisfactorily as a heating device.

(f) Effects of the invention A solid heat storage material that generates heat when adsorbing moisture is atomized, and the granules are used to form a fluidized bed. In some cases, moisture is added to the heat storage material and the air carrying this moisture is heated and supplied to the room to be heated, so that the heat storage material and the heat storage material that carry heat between the heat storage material and the heat source or the heating load are used. The heat transfer characteristics of the solid heat storage material are improved, and the shortcomings of the solid heat storage material, which has relatively poor thermal characteristics, can be compensated for, thereby providing a regenerative heating device with stable performance and high efficiency.

[Brief explanation of the drawing]

The figure is a schematic diagram showing the main part configuration of a regenerative heating device according to the present invention and a heating system incorporating this device. (4) - heat source device, (22 - heat storage tank, (23) - distribution plate, (24) - fluidized bed.

Claims (1)

[Claims] (11 Silica gel) A solid substance that generates heat when adsorbing moisture is granulated, such as activated alumina, and the granules are filled into a heat storage tank to form a fluidized bed of heat storage material. Heated gas is introduced into this fluidized bed to remove moisture, and during heating, gas with added moisture is introduced into the fluidized bed, and this gas adds moisture to the heat storage material and supplies thermal energy to the heating fluid. The heat storage type heating system (2) characterized in that the fluidized bed is incorporated in the heat storage tank as a multi-stage fluidized bed.