JPS633101A - Boiler - 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 Field of Application) This invention relates to a boiler, and more particularly, a heating medium pipe to be heated is heated in a high boiling point, low freezing point liquid such as ethylene glycol in a boiler. The present invention relates to a boiler with excellent thermal efficiency that allows a heat medium to be taken out at high temperature near normal pressure by heating the liquid through which it passes.

(Prior art) Boilers are generally of the type that stores water in the can body and heats the water using the heat of a combustion furnace or flue pipe and then takes it out, or of the type that heats the water by passing it through a pipe inside the can body. There are many things.

There are also high-pressure boilers that generate superheated steam in order to increase thermal efficiency or require high-temperature steam.

However, high-pressure boilers require the bodies and pipes to be strong enough to withstand high pressures, which not only increases equipment costs but also imposes stricter legal safety standards.

(Structure of the Invention) An object of the present invention is to solve the above-mentioned problems and to obtain superheated air or high-temperature heat medium at an internal pressure near normal pressure. A liquid with a high boiling point and a low freezing point, such as 100% ethylene glycol liquid, is stored in the liquid, and a burner combustion furnace is installed through a heat transfer wall to heat this liquid, or a flue pipe is disposed inside the liquid, The present invention also provides a boiler that can obtain superheated steam or high-temperature heat medium by passing a separately heated heat medium pipe through the liquid.

(Function) That is, with the above configuration, the liquid inside the can can be heated to a temperature far exceeding 100°C near normal pressure, so when the heat medium is water, superheated steam can be obtained, If the heating medium is a overnight body with a high boiling point, it can be taken out at a high temperature exceeding 100°C.

The mechanical strength of the can body does not have to be that great, as long as it can withstand pressure around normal pressure (safety standards are not strict either. Therefore, equipment costs are not high and management costs are also reduced. It also has good fuel efficiency.

Also, since the liquid has a low freezing point, it will not freeze even under cold conditions.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

10 is a can body containing a liquid with a high boiling point and a low freezing point.

Liquids with high boiling points and low freezing points include ethylene glycol (197.6°C, -13°C), propylene glycol (187.4°C, -60°C), diethylene glycol (
245℃, -8℃), triethylene glycol (287
, 4"C, -7,2℃), polyethylene glycol (grade 200-600), polypropylene glycol, hexylene glycol (195-197c,
Glycols such as -50'c), glycerin (290
(°C 118°C), paraffinic hydrocarbons with a carbon number of 20 or less (product name: Crystol, product name: Primol, product name: Markol, product name: liquid paraffin such as Baycol), biphenyl diphenyl ether as the main ingredients. Thermal medium (257°C, 12°C), Thermal medium mainly composed of alkylbenzene (176°C, -70°C), Thermal medium mainly composed of alkyl biphenyl (290-340°C)
, -30°C), a heating medium mainly composed of triaryldimethane (390°C, -35°C), a heating medium mainly composed of alkylnaphthalene (270 to 320°C, -3O to -5
0°C), a heating medium mainly composed of hydrogenated terphenyl (3
40°C, -10°C), a heat medium containing diarylalkane as a main component (295"C, -50°C), etc. The boiling point and freezing point are shown in parentheses in that order.

Reference numeral 12 denotes a burner, and a flue pipe 14 following the burner snakes upward and descends from the top to connect with the bottom of the chimney 16.

18 is a flue cleaning hole leading to the outside.

The flue pipe 14 is formed flat and is set to have a large heat transfer area.

20 is a pipe for hot water or other heat medium, as shown in the diagram.
After descending straight from the top surface of the can body 10 to the inner bottom of the can body 10, it meanders within a substantially horizontal plane within the meandering space a at the lowest part of the flue pipe 14, and then approximately within the next meandering space a. After meandering within the horizontal plane and further meandering within the spaces c, d, and e, it protrudes outward from the top surface of the can body 10 and is led out to the required location. In each space aXb, cXd, pipe 2
0 is located away from the upper surface of the lower flue pipe 14 and close to the lower surface of the upper flue pipe 14. In the space e, the pipe 20 is away from the upper surface of the flue pipe 14 and close to the upper surface of the can body 10.

Reference numeral 22 denotes a shrinkage tank, and the hollow tank is connected to the outside air of the can body 10 via a communication pipe 24.

26 is the above-mentioned high boiling point, low freezing point liquid, and the flue pipe 1
4 and a heat medium pipe 20 are stored in the can body 10 so as to be immersed therein.

With the above structure, the flame of the burner 12 turns into hot air inside the flue pipe 14 and rises while meandering upwards, and then descends from the top of the chimney 16 to the top from the bottom of the chimney 16. escape into the air.

On the other hand, the hot water and other heat medium in the pipe 20 gradually rises upward from the lower part and is taken out from the upper part.

The temperature of the flue pipe 14 becomes lower toward the top. However, the temperature of the liquid 26 becomes higher toward the upper part of the can body 10 due to thermal convection. In this way, the temperature gradients of the flue pipe 14 and the liquid 26 in the can body 10 are opposite, resulting in a relatively uniform temperature distribution. In addition, if we look at the details, in each of the spaces a, b, c, d, and e, the liquid 26 has a higher temperature toward the upper part, and since the pipe 20 is disposed in this high temperature area, the hot water in the pipe 20 Other heat media can be heated efficiently.

Also, due to the presence of the liquid 26, the inside of the can is maintained at a high temperature well over 100°C, so the flue pipe 14 and the pipe 2
0, heat exchange is reliably performed, and even if the flue pipe 14 and the pipe 20 are not in contact with each other, heat exchange is sufficient depending on the conditions.

Even if the temperature of the liquid 26 rises and volumetric expansion occurs, the contraction tank 22 contracts by that amount to absorb the volumetric expansion,
The increase in pressure inside the can body 10 is adjusted to approximately normal pressure. By placing the shrink tank 22 at the lower part of the can body 10, the volume of the portion of the liquid 26 where the temperature does not rise the least can be replaced by the volume of the shrink tank 22, so that the amount of the liquid 26 can be saved.

Furthermore, if a thin box-shaped expansion tank (not shown) is attached to the outside of the can body 10 and communicated with the liquid 26 inside the can body 10,
Even if there is temperature expansion of the liquid 26, the pressure inside the can body 10 can be prevented from increasing due to expansion of the expansion tank, and can be used as a normal pressure boiler.

Note that the pipe 20 may be wound around the flue pipe 14 in a coil shape, or may be arranged so that hot water or other heat medium flows through the pipe 20 in the opposite direction to that described above.

(Effects of the invention) As described above, this invention can raise the temperature of the liquid inside the can to far more than 100°C at around normal pressure, so when the heat medium is water, it is possible to obtain superheated steam. is possible,
If the heat medium has a high boiling point, it can be taken out at a high temperature exceeding 100°C.

Since it is sufficient that the can body can withstand pressure near normal pressure, the mechanical strength of the can body does not need to be very high, and the safety standards are not strict. Therefore, equipment costs are not high, management costs can be reduced, and fuel economy is good.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of an internal structure showing an embodiment of the present invention. 10... Can body, 12... Burner, 14... Flue pipe, 18... Cleaning hole, 20... Pipe,
22... Shrinkage tank, 24... Communication pipe,
26...Liquid.

Claims (1)

[Claims] 1. A boiler in which a heat medium pipe that is heated by exchanging heat with burner heat is built into the can, and a liquid with a high boiling point and a low freezing point, such as ethylene glycol, exists in the can at normal pressure. . 2. The boiler according to claim 1, wherein the burner combustion furnace and the high boiling point, low freezing point liquid chamber are separated by a heat transfer wall. 3. The boiler according to claim 1, wherein the heating pipe leading from the burner to the flue and the heat medium pipe coexist within the liquid sealed in the can.