JPH0252177B2 - - Google Patents

Description

Detailed Description of the Invention [Industrial Application Field] The present invention heats gas or liquid using the latent heat of condensation of steam, and circulates the condensed working fluid in a steam generator without using a circulation pump. This invention relates to a heating steam (working fluid) circulation device in a steam heating device that employs a liquid heating system.

[Configuration of conventional example and its problems] A circulating liquid device consisting of a liquid receiving container 03 and a liquid supply container 09 via a check valve 04 shown in FIG. 2 and a steam generator 01 which is a once-through boiler are supplied In a device having a structure in which a liquid pipe 010 and a pressure equalizing pipe 011 are connected, when the steam generator 01 is heated by the heater 05, the liquid temperature in the liquid supply container 09 is at the boiling point, or the pressure equalizing pipe 0
Unless the diameter of 11 is extremely large, the liquid supply container 0
It is known that no water is supplied from 9 to the steam generator 01 and therefore no steam can be generated.

When self-supplying water to the steam generator using such a reflux device, it is effective to fill the upper space of the liquid supply container 09 with non-condensable gas, such as air, in order to maintain the water supply normally. Become. In other words, when air at about atmospheric pressure is filled in the upper space of the liquid supply container 09 at startup, and the steam generator 01 is heated by the heater 05, a part of the generated steam flows into the liquid supply container 09 via the pressure equalization pipe 011. do. The inflowing steam warms the enclosed air and increases the pressure in the liquid supply container 09, so that the temperature in the liquid supply container 09 is lower than the header temperature of the steam generator 01 and the header pressure of the steam generator 01 is lowered. The pressure of the liquid supply container 09 can be made equal to the pressure of the liquid supply container 09. Therefore, the water level in the heating tube of the steam generator 01 is lowered by the evaporation loss of the steam generator 01, creating a water level difference with the liquid level in the liquid supply container 09, and water is supplied using the head difference.

In this way, water supply to the steam generator and generation of steam are guaranteed by the partial pressure effect of the air sealed in the upper space of the liquid supply container 09, but in this device, the liquid supply container 09
When the water level decreases and reaches the lower limit water level of the liquid level detection device 012, the heater 05 is stopped, the liquid supply container 09 is cooled and depressurized, and the liquid receiving container 03 is cooled through the check valve 04.
The working fluid is allowed to fall back into the liquid supply container 09, and when the water level reaches a high level, the heater 05 is re-ignited to generate steam. Repeating such a cycle causes the amount of sealed air to become insufficient and the operating performance to deteriorate, so it is necessary to replenish the air.

In addition, there is a steam generator connected to a liquid return device as shown in FIG. 3 in order to automatically replenish air.

The liquid return device of this device has a configuration in which a cylindrical air suction pipe 012 with a small hole is placed in a liquid receiving container 02 above a liquid return pipe 010 that has a built-in float valve 11 in a liquid supply container 01. be.

In this liquid return device, the heater 04 is stopped when the lower limit water level is detected by the liquid level detection device 013 of the liquid supply container 01.
The liquid supply container 01 is cooled and depressurized. As a result, the hydraulic fluid in the air suction pipe 012 is caused to fall preferentially into the fluid supply container 01 by pushing down the float valve 011 due to gravity. At this time, the upper space of the liquid supply container 01 communicates with air through the air suction pipe 012, so that air can be sucked and sealed into the liquid supply container 01. Then, the working fluid in the liquid receiving container 02 falls through the small hole of the air suction pipe 012 and returns until the upper limit water level is reached in the liquid supply container 01, pushing up the float of the float valve 011. When the upper limit water level is reached, the heater 05 is re-ignited and the steam generator 03 is heated to generate steam, a part of which flows into the upper space of the liquid supply container 01 through the pressure equalization pipe 08, adding sealed air. Warm up. As a result, water will be supplied. In this way, air can be automatically sucked and sealed when the working fluid falls back from the liquid receiving container 02 to the supplying liquid container 01, allowing water to be supplied to the once-through boiler as a steam generator without using a pump. However, in this method, the liquid return operation is performed by temporarily stopping the heater 05 and cooling and depressurizing the liquid supply container 01, so the generation of steam is discontinuous (intermittent). ),
This will be disadvantageous in practical terms.

[Object of the present invention] The object of the present invention is to provide a liquid return device that can automatically suck and enclose air without using a pump, and in a system that enables water supply to a once-through boiler operating at high pressure, the above-mentioned method is provided. An object of the present invention is to propose a liquid return device that can eliminate the discontinuous generation of steam and can continuously generate steam even during liquid return.

[Configuration of the present invention and its operation] The present invention employs the following configuration as a means for achieving the above object.

A steam generator with a heating source attached, a heat exchanger that guides the steam generated by the steam generator to give latent heat of condensation to the gas or liquid, and a condensed liquid condensed in the heat exchanger that is pumped into the heat exchanger. A liquid return pipe that returns liquid into a liquid receiving container open to the atmosphere due to the vapor pressure generated by the liquid is connected to the liquid receiving container via a condensate delivery pipe equipped with a float valve, and is connected to the steam generator. In a heating steam circulation system consisting of a condensate supply pipe and a supply liquid container connected by a pressure equalization pipe and equipped with a liquid level detection device, the upper space of the liquid receiving container and the upper space of the liquid supply container are kept under pressure. A pressure equalizing valve is connected to the pressure equalizing pipe, and the pressure equalizing valve is opened when a lower water level is detected in the liquid level detection device attached to the liquid supply container. A heating steam circulation device in a steam-type heating device, which closes a pressure relief valve and opens a pressure equalization valve when an upper water level is detected. In the above device, the steam generated by the steam generator is condensed by imparting latent heat of condensation to the surroundings in the radiator, and the condensed liquid is stored in the liquid receiving container. When the steam generator continues to generate steam and the water level in the liquid supply container falls to the lower water level, the liquid level detection device detects this and opens the pressure relief valve to equalize the inside of the liquid receiving container and the liquid supply container. Pressure. When the pressure in both containers becomes equal, the condensate stored in the receiving container pushes the float valve open with its gravity.
Flows down into the liquid supply container. In this way, the condensate enters the liquid supply container, and when the water level in the condensate rises to the upper water level, the liquid level detection device detects this, closes the pressure relief valve, and opens the pressure equalization valve. At the same time, the float valve closes the liquid return pipe between the liquid receiving container and the liquid supply container. By repeating this process, the condensed liquid stored in the liquid receiving container is returned to the liquid supplying container.

[Embodiments and their effects] In FIG. 1, 1 is a liquid supply container, 2 is a liquid receiving container,
Reference numeral 3 designates a once-through type steam generator, in which the liquid supply container 1 and the steam generator 3 are connected to a liquid supply pipe 5 and a pressure equalization valve 12 with a check valve 11 interposed therebetween, which allows flow only in the direction of the steam generator 3. It is connected with an intervening pressure equalizing pipe 6.
A steam pipe 7 receives the thermal energy of the heater 4 and sends out the steam generated by the steam generator 3. A condensing pipe 8 and an air release pipe 15 are attached to the upper part of the liquid receiving container 2. At the top of the liquid supply container 1, there is a float valve 1 connected to the bottom of the liquid receiving container 2.
A return liquid pipe 9 containing 0 is attached. The upper space of the liquid receiving container 2 and the upper space of the liquid supply container 1 are connected to an air suction pipe 1 which also serves as a pressure relief pipe with a pressure relief valve 14 interposed therebetween.
Connected by 3. Further, a liquid level detection device 16 is installed inside the liquid supply container 1. This liquid level detection device 16 operates to close the pressure equalizing valve 12 and open the pressure relief valve 14 with the low water level detection section 16b, and operates to open the pressure equalization valve 12 and open the pressure relief valve 14 with the high water level detection section 16a. Works to close.

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

First, when the water level of the liquid supply container 1 is between the high water level and the low water level of the liquid level detection device 16, the pressure equalization valve 12 is in an open state and the pressure relief valve 14 is in a closed state. The steam generator 3 receives thermal energy from the combustion of the heater 4, and the generated steam is passed through the steam pipe 7 to the radiator 17.
sent to. The condensate generated by heat dissipation in the radiator 17 is returned to the liquid receiving container 2 via the condensate return pipe 8 . Since the pressure equalization valve 12 is open in this state, a part of the steam generated in the steam generator 3 flows into the upper space of the liquid supply container 1 via the pressure equalization pipe 6, and during the previous falling liquid return. Heats the sucked and sealed air. At this time, the pressure in the upper space of the liquid supply container 1 is the sum of the partial pressure of the heated air and the partial pressure of the inflowing steam, and this pressure is equal to the steam pressure of the steam generator 3. This pressure creates a pressure difference between the pressure in the liquid receiving container 2, which is open to the atmosphere, and the liquid supply container 1, and the float valve 10 is pushed in the closing direction. Furthermore, the liquid in the liquid supply container 1 does not reach its boiling point, ensuring water supply to the steam generator 3, and is supplied to the steam generator 3 via the liquid supply pipe 5. That is, steam generator 3
The water level in the heating tube of the steam generator 3 decreases by the amount of steam generated, and a difference in water level with the liquid supply container 1 occurs. Therefore, a head difference occurs, and water is continuously supplied to the steam generator 3 from the liquid supply container 1. Liquid supply container 1
The water level decreases as the steam generator 3 continues to operate, and the low water level is detected by the liquid level detection device 16.
The signal is sent to the pressure equalization valve 12 and the pressure relief valve 14, causing the pressure equalization valve 12 to close and the pressure relief valve 14 to open. At this time, when the pressure equalization valve 12 is closed, the steam generator 3 is separated from the liquid supply container 1 by the pressure equalization valve 12 and the check valve 11. continuously generates steam. On the other hand, by closing the pressure equalizing valve 12, the flow of steam into the upper space of the liquid supply container 1 via the pressure equalizing pipe 6 is stopped, and at the same time, by opening the pressure relief valve 14, the pressure in the liquid supply container 1 is reduced via the pressure relief pipe 13. The liquid is introduced into the liquid receiving container 2 and exposed to the atmosphere. Therefore, when the pressure in the liquid supply container 1 becomes equal to the pressure (atmospheric pressure) in the liquid receiving container 2, the float valve 10 in the liquid supply container 1 is pushed down by the gravity of the hydraulic fluid in the liquid receiving container 2, and the receiving liquid is The working fluid in the container 2 falls into the liquid supply container 1 via the liquid return pipe 9 and is refluxed. Also, at this time, the inside of the liquid supply container 1 is cooled to a negative pressure state, and air can be sucked and sealed into the upper space of the liquid supply container 1 through the air suction pipe 13 which also serves as a pressure release pipe. When the water level in the liquid supply container 1 reaches a high water level, the high water level is detected by the liquid level detection device 16, and the signal is sent to the pressure equalization valve 12 and the pressure relief valve 14, and the pressure equalization valve 12 is opened and the pressure relief valve 14 is closed. becomes. Therefore, a part of the steam generated in the steam generator 3 flows into the upper space of the liquid supply container 1 again via the pressure equalization pipe 6, heats the air, and increases the pressure of the liquid supply container 1 and the steam generator. 3 can make the temperature inside the liquid supply container 1 equal pressure (equal pressure) at a temperature lower than the steam temperature of the steam generator 3, and the float valve 10
Press to ensure water supply to the steam generator 3.

[Effects of the present invention] As described above, the present invention provides a water head return system that uses the partial pressure effect of the air sealed in the liquid supply container to supply water from the liquid supply container to the steam generator based on the head difference, and When the working fluid in the container runs out, by combining the gravity return liquid that falls back from the liquid receiving container to the liquid supply container by gravity, without using a pump,
Water can be supplied to the steam generator, which is a high-pressure once-through boiler, from the liquid supply container, and when liquid is returned, the working liquid in the liquid receiving container under atmospheric pressure can be dropped into the high-pressure liquid supply container and returned. Moreover, even during this liquid return, steam can be continuously generated.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a circulation device according to the present invention, and FIGS. 2 and 3 are explanatory diagrams of a conventional circulation device. 1...Liquid supply container, 2...Liquid receiving container, 3...Steam generator, 4...Heater, 5...Liquid supply pipe, 6...Pressure equalization pipe, 7...Steam pipe, 8...Condensation Liquid return pipe, 9...
...Return pipe, 10...Float valve, 11...Check valve, 12...Pressure equalization valve, 13...Pressure relief pipe (air suction pipe), 14...Pressure relief valve, 15...Atmospheric release pipe, 1
6...Liquid level detection device, 17...Radiator.

Claims (1)

[Claims] 1. A steam generator with a heating source attached, a heat exchanger that guides the steam generated by the steam generator to give latent heat of condensation to the gas or liquid, and pumps the condensed liquid condensed in the heat exchanger into the heat exchanger. a liquid return pipe that returns liquid into an atmosphere-open liquid receiving container due to the vapor pressure generated;
It is connected to the liquid receiving container through a condensate delivery pipe equipped with a float valve, and connected to the steam generator through a condensate supply pipe and a pressure equalization pipe, and is connected to a liquid supply pipe equipped with a liquid level detection device. In a heating steam circulation device consisting of a container, the upper space of the liquid receiving container and the upper space of the liquid supply container are communicated through an air suction pipe with a pressure relief valve, and a pressure equalizing valve is attached to the pressure equalizing pipe,
In the liquid level detection device attached to the liquid supply container, the pressure relief valve is opened and the pressure equalization valve is closed when a lower water level is detected, and the pressure relief valve is closed and the pressure equalization valve is opened when an upper water level is detected. A heating steam circulation device in a steam heating device consisting of: