JPS5826906A - High-temperature air mixed steam generator - 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 The present invention relates to a device for generating steam by transmitting heat generated by combustion of fuel to a liquid such as water, and an object of the present invention is to reduce dryness with an extremely rational and inexpensive configuration. By obtaining high quality dry steam 2, it is possible to save fuel and downsize the entire device.

Currently, the steam generated from small standard steam boilers, which are most commonly used as steam heat sources in factories, etc.
Warehouses are saturated steam with extremely poor dryness, which indicates the proportion by weight of steam (gas) in the wet steam. This wet saturated steam with a high water content is supplied to steam-using equipment such as presses and dryers that use steam to perform work, processing, or drying in factories, etc., and the steam depends on the air inside the equipment. Latent heat is taken away and condensation occurs, which further deteriorates the dryness.The amount of heat held by wet saturated steam is greatly affected by its dryness, so the amount of heat held per constant amount of steam decreases significantly, and the dryness becomes worse. The moisture generated by steam forms a thick drain layer on the heat exchange and heat transfer surfaces of equipment, and this saturated water has very poor thermal conductivity. Therefore,
K because the heat absorption efficiency of steam-using equipment will be significantly reduced.
This wastes a lot of fuel and is a factor that hinders miniaturization of the entire device. On the other hand, steam boilers in recent years have tended to be smaller, but they hold less water and are prone to carryover when they need the most heat. hold the amount,
Since the amount of latent heat required during heat exchange is reduced, it is usually uneconomical to use several steam boilers in parallel.

In view of the above-mentioned conventional problems, the present invention has an extremely rational and inexpensive configuration that mixes high-temperature air heated using exhaust gas heat with moist saturated steam, and which combines high-temperature air and moist saturated steam. By mixing each at an appropriate mixing ratio using a pressure regulating valve, there are problems with conventional methods. - The high-temperature air mixed steam generator of the present invention will be explained in detail below based on the drawings showing one embodiment thereof.

That is, the configuration of the embodiment apparatus is such that a two-thick heated air pipe 3 having a substantially meandering shape in the horizontal direction is connected to an air communication chamber 4 at an exhaust gas discharge port 2 at the top of a boiler body 1 which has the same form as a conventionally known steam boiler.
The insulated housing 5 is installed in a communicating manner, and is connected to the inlet of the heating air pipe 3 by a compressor 6, which serves as a pressure air delivery source, through a pressure air pipe 7. An air pressure regulating valve 8 (f- is inserted into the air pipe 7, and a steam pipe 9 of the boiler main body 1 is connected to a suction mixer 10, and a steam pressure regulating valve 11 is installed in the steam pipe 9. The gist is that the outlet of the air pipe 3 is connected to the mixer 1G via a heated air pressure feed pipe 12.

In the figure, 13 is a water pipe body, 14.15 is a lower drum and an upper drum of the water pipe body 13, a steam chamber formed above the water surface of the 16 #i upper drum 15, 17 is a water level gauge, and 18 boilers. The oil burner 2 (l combustion chamber) is attached to the water pipe body 13 and the oil burner 2 (l combustion chamber) is attached to the water tube body 13 and is attached to the combustion chamber 20 to generate the combustion power of the combustion chamber 20.

A force field rest 22 is formed horizontally in the heat insulating casing 5 to guide the exhaust gas so that it evenly contacts the heat transfer surface of the heated air pipe 3. Baffle board to guide,
23 is an exhaust pipe connected to the exhaust port 24 of the heat insulating housing ε, 26 and 26 are a steam valve and a check valve respectively installed in the steam pipe 9, and 27Vi is a check valve installed in the pressure air pipe 7. valve, 2
8゜29.30 is a check valve, a heated air release adjustment valve, a check valve, and a check valve provided in the heated air pressure feed pipe 12, respectively, and hot water from a 31-piece hot well tank (not shown) is connected to the lower part through the water supply pipe 32. The water supply pumps that supply the drum 14 are shown.

Next, to explain the operation of the embodiment configured as described above, heavy oil and air are mixed by the oil burner 18 and blown into the firebox 191C in the form of mist to be burned. As shown by the solid line arrow, the combustion gas generated at 20 heats the water in the water tube body 13, becomes exhaust gas, enters the heat insulating casing 5, and is further discharged to the outside through the exhaust pipe 23t. Ru. Then, as the water in the water pipe body 13 placed in the passage of the high-temperature combustion bus is heated, moist saturated steam is generated in the steam chamber 16, as shown by the dashed-dotted line arrow.
The steam is fed into a mixer 10 through a steam pipe 9. If the request is refused, the steam pressure of the saturated steam sent to the mixer 10 is always reduced to a constant level by the steam pressure regulating valve 11.

On the other hand, as shown by the two-dot chain arrow, the compressed air sent out from the compressor 6 is reduced to a pressure slightly lower than the steam pressure of the wet saturated steam by the pressure air regulating valve 8, and then sent to the heated air pipe 3. The air absorbs heat from the exhaust gas flowing in from the exhaust gas outlet 2 of the boiler body 1, becomes high temperature air, and is sent to the mixer 10 through the heated air pressure pipe 12, and is heated by the wet saturated steam flowing into the mixer 10. It is sucked in and mixed into wet saturated steam, then sent to steam-using equipment for heating and equipment operation, and the steam drain that is discharged after heat exchange is stored in a hot well tank. At the same time, the water is circulated to the water pipe 13 by the water supply pump 31.

Next, the effects of the above embodiment will be explained.

By mixing the moist saturated steam from the boiler body 1 with high-temperature air heated using exhaust gas heat, it becomes dry steam with good dryness, which increases its heat capacity and increases the flow rate of steam. Not only does this have the great advantage of increasing the amount of heat supplied to steam-using equipment, but also the following remarkable effects can be obtained in terms of heat absorption in steam-using equipment.

That is, the temperature of the steam drain discharged from the steam-using equipment after heat exchange is considerably lower than the temperature of the steam drain when moist saturated steam is supplied as in the conventional case. This shows that the supplied heat is absorbed very effectively in the steam-using equipment, and the fuel consumption of the steam-using equipment is reduced by about 20%. Although this phenomenon could not be clearly explained theoretically, the results from various measurements suggest that high-temperature air probably absorbs the moisture that would otherwise condense in the steam, depending on its retained temperature and amount of heat. This prevents liquefaction, maintains the heat content of saturated water within the operating temperature range of steam-using equipment, promotes effective heat absorption, and minimizes the drain layer that forms on the heat transfer surface of steam-using equipment. This seems to be due to the fact that the heat absorption efficiency of the equipment is increased by doing so.

To explain in more detail, since air has an insulating effect, mixing air with steam is considered a taboo in equipment because it will cause air problems in equipment that uses steam, but this example When installed, it is heated to almost the same temperature as wet saturated steam and mixed with air that has a low moisture content, thereby preventing the problems that occur with conventional methods. In addition, simply mixing heated air with moist saturated steam would result in a larger amount of air than necessary, which would cause trouble in the steam-using equipment, so a pressure regulating valve (8.11t) was installed to adjust the air pressure and steam pressure. each constant, and the air pressure is set slightly lower than the steam pressure,
In the mixer 10, high-temperature air is sucked in and mixed with moist saturated steam, so the air pressure between the check valves 28 and 30 of the heated air pressure pipe 12 is almost the same as the steam pressure of the moist saturated steam. The mixture is then mixed at an appropriate mixing ratio. Moreover, since the heated air is sucked in with moist saturated steam, the heated air is sucked and mixed according to the amount of steam used, and an appropriate mixing ratio is always maintained. Also, even if the temperature of the high-temperature air is slightly lower than the temperature of the moist saturated steam, a thermometer etc. will show that after mixing, a high-temperature air mixed steam is generated that is slightly higher than the temperature of the moist saturated steam. Obtained from actual measurement results. However, it is desirable that the temperature of the high-temperature air be higher than the temperature of moist saturated steam.

In addition, the heated air release adjustment valve 29t is a regular KFM valve to release a small amount of high-temperature air to the atmosphere, and even when the amount of steam used is small, the flow rate of the air in the heated air pipe 3 can be controlled. This completely prevents the air temperature from dropping due to air temperature drop.

In the above embodiment, the shape of the heating air pipe 3 is meandering in the horizontal direction, but it goes without saying that the same effect as in the embodiment can be obtained even if the heating air pipe 3 is spirally wound from the bottom to the top. It is.

As mentioned above, according to the high-temperature air mixed steam generator of the present invention, it is possible to heat the air using the residual heat, which conventionally resulted in heat loss, as a heat source, and to remodel an existing steam boiler. It is an extremely rational and inexpensive structure that can be constructed by simply attaching the necessary parts to the outside of the boiler body without any problems, and it is possible to significantly reduce fuel consumption f and downsize the entire device. Therefore, the present invention has extremely high industrial value and remarkable practical effects.

[Brief explanation of drawings]

FIG. 1 is a cutaway front view of an embodiment of an uninvented high-temperature air mixed steam generator. 1... Boiler body, 2... Exhaust gas outlet, 3
...Heating air pipe, 5...Insulated casing, 6...Compressor, 7...Pressure air pipe, 8...Air pressure regulating valve, 9...Steam pipe, 10...Mixing Equipment% 1
1...Steam pressure regulating valve. Patent application Tenjyo Shibuyuki Male agent Patent attorney Iwaodo Sugi Patent attorney Katsunori Sugi

Claims (1)

[Claims] α) An insulating cylinder with a heated air pipe inside is connected in communication with the exhaust gas discharge port of the boiler body, and an air pressure is applied to the pipe line connecting the inlet of the heated air pipe and the pressurized air delivery source. Insert a regulating valve and connect the outlet of the heated air pipe and the steam pipe of the boiler body to the mixer. A high temperature air mixed steam generator characterized in that the steam pipe is equipped with a KM air pressure regulating valve.