JP2599653B2 - Indirect steam humidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an indirect steam humidifier for use in an air conditioner of a building which can be supplied with high-pressure primary steam as a heat source, such as a district air conditioner, a hospital, a factory, and the like.

[0002]

2. Description of the Related Art As a humidification method used for building air conditioning equipment, there are methods such as water spray humidification, ultrasonic humidification, and vaporization humidification, but the steam humidification method is economically and controllable. Excellent in terms of surface. Conventional steam humidification method
A method has been adopted in which the supplied steam is guided to a steam spray pipe provided in an air conditioner via a control valve or the like, and is humidified as it is to the flowing air in the air conditioner.

However, in this method, when the distance of the steam pipe is long, iron rust in the pipe, a sediment scale, or a cleaning agent used for adjusting the water quality of a high-pressure boiler may be mixed into the spray steam. However, there is a problem that it is not preferable for health and hygiene. Also, if the primary steam is directly sprayed for humidification, it becomes impossible to collect condensed water close to pure water,
There is also a problem that it is not a good measure in boiler water quality management.

[0004] In view of these problems, a drain trap is attached to the condensed water discharge port of the primary steam of a general steam-heated heat exchanger to take out the secondary steam, and the secondary steam is used for humidification. It is possible to do.

[0005]

However, if a humidifier is constructed by attaching a drain trap to the condensed water discharge port of the primary steam of a general steam-heated heat exchanger to take out the secondary steam, Condensed water flows out intermittently from the drain trap. This means that the steam flow per unit area of the heating coil is limited, so that in order to obtain a certain amount of secondary steam, the heating coil must be lengthened, and the device becomes bulky. There is a problem. Further, since the outflow of the condensed water from the drain trap is intermittent, the generation of secondary steam is also intermittent, and there is a problem that humidification control becomes difficult.

The present invention has been made in view of the above-mentioned problems of the conventional apparatus,
Enables clean steam humidification that does not include cleaning agent contained in primary steam and iron rust in the middle of piping, makes the entire humidifier compact and economically practical, and furthermore continuously discharges secondary steam. It is an object of the present invention to provide a novel indirect steam type humidifying device which can generate proportional humidification and control it.

[0007]

According to the present invention, there is provided:
A heating tank that stores water therein, is connected to a primary heating steam supply pipe having a control valve, and has a heat exchanger such as a heating coil that circulates the primary heating steam and heats and evaporates the water. A level tank having a level sensor for communicating and adjusting a water level of the heating tank, a steam spray pipe connected to the heating tank for spraying secondary steam generated in the heating tank into the air conditioner, a heating coil, etc. A condensed water continuous discharge block provided at the outlet of the heat exchanger, a water supply pipe provided with a water supply solenoid valve and supplying water to the steam heating tank and the level tank, and a drain pipe connected to the heating tank and provided with a drainage electromagnetic valve. It is characterized by having.

[0008]

[Function] To a heat exchanger such as a heating coil, a primary steam for heating adjusted to a pressure of usually 2 kg / square cm is supplied as a heat source, and the steam releases heat of condensation in the heat exchanger to become condensed water. The water is continuously returned to the boiler through the condensed water continuous discharge block. The water in the heating tank is heated to become low-pressure secondary steam, and this secondary steam humidifies the air flowing in the air conditioner from the steam spray pipe.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the indirect steam humidifier of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes a heating tank for storing water therein, and a heating coil as a heat exchanger 2 is provided therein. The heating coil 2 is connected to a primary heating steam supply pipe 4 provided with a control valve 3 and exchanges heat by flowing primary heating steam from a boiler. The primary heating steam releases heat of condensation to form condensed water, which is returned from a condensed water continuous discharge block 5 provided at an outlet of the heating coil 2 from the heating tank 1 through a circulation pipe 6 to a boiler. .

In the figure, reference numeral 7 denotes a heating coil 2 in the heating tank 1.
A steam spray tube for spraying secondary steam generated by heat exchange into the air conditioner is connected to the heating tank 1. Further, reference numeral 8 in the figure denotes a level tank having a level sensor 9 which is connected to the heating tank 1 by a communication pipe 10.
A water supply pipe 12 having a water supply electromagnetic valve 11 is connected to the level tank 8, and the water is automatically supplied from the water supply pipe 12 to the heating tank 1 and the level tank 8 so that the water level is constant.

In the figure, reference numeral 13 denotes a pressure equalizing pipe connecting the upper portions of the heating tank 1 and the level tank 8 so as to equalize the tank internal pressure. In the figure, 14 is the heating tank 1
And a drain pipe connected to the level tank 8 and a drain solenoid valve 1
5 The water in the heating tank 1 is concentrated and the scale adheres to the heating coil 2. In order to suppress the adhesion of the scale, the drainage electromagnetic valve 15 is opened to periodically drain the water from the tank.

FIG. 2 shows a block 5 for continuously discharging condensed steam. The block 5 has an inlet 16 for connecting a pipe end constituting an outlet of the heating coil 2, and an outlet 17 for connecting the circulation pipe 6, and a communication hole 18 passing through the inlet 16 and the outlet 17. It is formed. A strainer 19 and an orifice 20 are removably mounted in the communication hole 18. The orifice 20 is detachably attached so that it can be replaced with an orifice having a different diameter.

The operation of the indirect steam humidifier of the present invention having the above configuration will be described below. First, water is stored in the heating tank 1 and the level tank 8, and primary heating steam is supplied to the heating coil 2 to heat the water in the heating tank 1. The heated water is supplied as secondary low-pressure steam from the steam spray pipe 7 and is supplied to the circulation air in the air conditioner to perform humidification.

The steam in the heating coil 2 releases condensed heat to become condensed water, is sent out from the condensed water continuous discharge block 5, and is returned to the boiler by the circulation pipe 6. Since the condensed water continuous discharge block 5 is always open, the condensed water is continuously discharged, so that the secondary steam is constantly supplied. Further, if the orifice 20 is detachably attached and replaced with an orifice having a different diameter, a humidifying device having a different humidifying amount per unit time can be obtained.

When the secondary steam is supplied in this way,
Although the water level of the humidification tank 1 and the level tank 8 becomes low,
The level sensor 9 of the level tank 8 senses this, opens the water supply solenoid valve 11 of the water supply pipe 12, and automatically supplies makeup water. In addition, if the water in the heating tank 1 is concentrated, the drainage solenoid valve 15 of the drain pipe 14 is opened to discharge the concentrated water, and if new water is supplied, the adhesion of scale can be suppressed.

The following table shows the results of experiments conducted by the apparatus of the present invention and the results of experiments conducted by using a commercially available drain trap instead of the condensed water continuous discharge block of the apparatus of the present invention. In this experiment, the same heating tank having a diameter of 141 mm and a height of 480 mm was used, the same heating coil was used, and a supply steam of 2 kg / cm 2 was used.

The experimental results of the apparatus of the present invention are shown in Table 1 below. In this experiment, three types of orifices having a diameter of 1.0 mm, 1.2 mm, and 1.5 mm were used. In Table 1, A measured water supply amount is the amount of water supplied to the heating tank, and the unit is gram.
The measurement time is the experiment time, and the C measurement drain amount is
The amount of condensed water discharged from the steam spray tube, in gram. And the D humidification amount is: Q = AC / 1000 ×
Humidification amount per unit time represented by the formula of 3600 / B, unit is kg / h. The E average amount is an average value of the humidification amount per unit time.

Next, the F measured condensed water amount is the amount of condensed water of the primary heating steam per the above B measuring time, the unit is gram, and the G condensed water amount is represented by the formula F / 1000 × 360.
The amount of primary heating feed steam per unit time, expressed as 0 / B, in kilograms.

[Table 1]

Next, in the experiment of the apparatus using the drain trap, since the drainage of the condensed water from the drain trap is not continuous but intermittent, the opening and closing experiment time of the drain trap and the amount of the condensed water were obtained by integration. Table 2 below.

[Table 2] Based on this integrated amount, the humidification amount per unit time and the amount of the primary heating supply steam were obtained. The results are shown in Table 3 below.

[Table 3] As can be understood from the above experimental examples, the apparatus of the present invention can effectively use the primary heating steam, and can supply as much secondary humidifying steam as possible.

[0020]

As described above, according to the indirect steam humidifier of the present invention, clean tap water can be supplied as secondary humidified steam by primary heating steam. It has a great effect of steam humidification.
By adopting the condensed water continuous discharge block, the steam flow per unit heat transfer area of the heating coil could be increased, and the amount of secondary steam generated for humidification could be increased. As a result, the humidifier can be reduced in size and can be supplied in a compact form, which has the effect that practical use has become possible. In addition, since the condensed water of the heating coil is returned to the boiler, pure water is returned to the boiler, so that the water quality of the boiler can be easily controlled and the heat efficiency can be improved. Further, since the secondary steam for humidification can be continuously supplied, the supplied steam has an effect of being able to perform a steady and proportional control.
In addition, by changing the diameter of the orifice, there is an advantage that it is possible to provide a device having the same standard product but a different humidification amount.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of an indirect steam humidifier of the present invention.

FIG. 2 is a sectional view showing a condensed water continuous discharge block used in the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating tank 2 Heat exchanger (heating coil) 3 Control valve 4 Primary heating steam supply pipe 5 Condensed water continuous discharge block 6 Circulation pipe 7 Steam ejection pipe 8 Level tank 9 Level sensor 10 Communication pipe 11 Water supply solenoid valve 12 Water supply pipe 13 equalizing pipe 14 drain pipe 15 drain solenoid valve 16 inlet 17 outlet 18 communication hole 19 strainer 20 orifice

Claims (2)

(57) [Claims] 1. A heating tank which stores water therein, is connected to a primary heating steam supply pipe having a control valve, and has a heat exchanger such as a heating coil which circulates the primary heating steam and heats and evaporates the water. A level tank communicating with the heating tank and having a level sensor for adjusting a water level of the heating tank; and a steam spray pipe connected to the heating tank to spray secondary steam generated in the heating tank into an air conditioner. And a condensed water continuous discharge block provided at an outlet of a heat exchanger such as a heating coil, a water supply pipe provided with a water supply electromagnetic valve and supplying water to a steam heating tank and a level tank, and a drainage electromagnetic valve connected to the heating tank. An indirect steam humidifier having a drain pipe provided with: 2. The indirect steam humidifier according to claim 1, wherein an orifice diameter of the steam condensed water continuous discharge block can be changed.