JPS592802Y2 - Deaerator - Google Patents

Description

[Detailed description of the invention] Degassed water is usually used as make-up water for boilers to prevent corrosion of equipment.

Water without deaeration usually lasts for 6 to 10 seconds at atmospheric pressure and room temperature.
ppm of oxygen is dissolved, which is the main cause of corrosion.

Depending on the size of the boiler and the amount of make-up water, the make-up water deaerator may be a heating deaerator or a normal temperature vacuum deaerator, or both may be used in combination.

In addition, room temperature vacuum deaerators include those that use relatively large-scale water ring vacuum pumps and those that use oil rotary vacuum pumps that have a small capacity but require high degassing performance (high degree of vacuum). be.

The present invention relates to a deaerator that employs an oil rotary vacuum pump.

A conventional deaerator will be explained with reference to FIGS. 1 and 2.

The water stored in the lower part of the deaeration tower 01 is injected from the spray nozzle 04 at the top of the deaeration tower via the check valve 03 by the circulation pump 02, and the dissolved gas is discharged out of the system by the oil rotary vacuum pump 05.

The oil rotary vacuum pump 05 has a rotor 010 and a cylinder 011 built therein, and is filled with lubricating oil 012.

As the rotor 010 rotates in the direction of the arrow, gas is sucked through the intake hole 013, passes through the oil through the exhaust check valve 014, and is exhausted to the outside of the oil rotary vacuum pump 05 through the exhaust hole 015.

By repeating this circulation, the dissolved gas in the water, mainly air, is degassed and the water is stored in the lower part of the degassing tower 01.

In this case, the higher the degree of vacuum in the deaeration tower 01 is maintained, the better the deaeration performance is, so the oil rotary vacuum pump 05 must be continuously operated to maintain a high degree of vacuum.

However, the current oil rotary vacuum pump 05 contains water vapor equivalent to the degree of vacuum in the intake air from the degassing tower 01, so the vacuum performance deteriorates over time and problems such as seizure of the oil rotary vacuum pump 05 occur. It happened frequently.

The reason for this is that although two stages of mist separators 06 are provided in the intake line of the intake hole 013, the intake velocity is low, so the removal effect of moisture corresponding to the vapor pressure in the degassing tower 01 is extremely insufficient. These moistures are directly mixed into the lubricating oil 012 of the oil rotary vacuum pump 05 and are emulsified.

As a result, the oil film lubrication between the impeller and cylinder 011 of the oil rotary vacuum pump 05 is destroyed, and the roller 0 due to heat generation.
10 seizure troubles and increase in lubricating oil temperature (viscosity decrease)
This resulted in a decrease in vacuum performance.

Therefore, in order to maintain vacuum performance, it is necessary to frequently stop the oil rotary vacuum pump 05 and replace the lubricating oil 012, which causes an extreme decrease in the water production performance of the deaerator itself. was.

Therefore, the present invention improves the above-mentioned drawbacks of the conventional deaerator,
The purpose was to provide a degassing device with improved performance. An oil-water separator with a temperature controller is built into or combined with an oil rotary vacuum pump to separate and discharge water in the oil and maintain a constant temperature. To provide a degassing device that maintains

Next, the present invention will be specifically explained based on an embodiment shown in FIGS. 3 and 4.

A discharge pipe equipped with a valve 7 in the middle is connected to the lower part of the degassing tower 1, and the pipe on the upstream side of the valve 7 is branched in the middle to install a circulation pipe. It is connected to a spray nozzle 4 that opens inside the degassing tower 1 above.

A circulation pump 2 and a check valve 3 are arranged in order from the upstream side in the middle of the circulation pipe, and a make-up water pipe equipped with a check valve 8 in the middle is connected to the downstream side of the check valve 3. ing.

An intake line is connected to the upper part of the degassing tower 1, and the intake line is connected to an intake hole 13 of an oil rotary pump 5.

Furthermore, two mist separators 6 are arranged in the middle of the intake line.

As shown in FIG. 4, the oil rotary pump 5 has a cylinder 11 attached inside a main body 9, and the cylinder 11 is surrounded by lubricating oil 12.

A rotor 10 is arranged within the cylinder 11.

The intake hole 13 passes through the main body 9 and is connected to the cylinder 11.

Further, an exhaust check valve 14 that opens in the lubricating oil 12 is attached to the cylinder 11, and an exhaust hole 15 is provided in the upper part of the main body 9.

A drain pipe 17 having a drain cock 16 in the middle is connected to the lower part of the main body 9, and a pipe branching from the middle of the drain pipe 17 and having an oil column feed pump 18 in the middle to supply oil to the drain separator 19 is arranged. has been done.

The drain separator 19 includes a first chamber 22 separated by a partition wall 20 and a perforated plate 21, a temperature detector 23, and a heater 24.
and a second chamber 26 containing a cooler 25.

A pipe communicating with the inside of the second chamber 26 and having a solenoid valve 27 in the middle is connected so as to open inside the main body 9.

The solenoid valve 27 is operated by a signal from an oil detector 28 attached to the main body 9.

According to this device, the inside of the deaeration tower 1 is made into a vacuum by the oil rotary pump 5, and deaeration is performed by the same phenomenon as in conventional devices, but as the rotor 10 rotates, gas is sucked through the intake hole 13, The lubricating oil 12 is passed through the exhaust check valve 14 and exhausted to the outside of the main body 9 through the exhaust hole 15.

When gas passes through the lubricating oil 12, moisture gets mixed into the lubricating oil 12, but the lubricating oil 12 is transferred from the drain pipe 17 to the oil transfer pump 18 (the amount of transfer can be adjusted with a stroke pump).
The lubricating oil is transferred to the drain separator 19, where moisture, sludge, etc. are separated and settled in the first chamber 22 due to the difference in specific gravity, and the purified lubricating oil is floated to the second chamber 26.

The partition wall 20 and the perforated plate 21 suppress the flow of lubricating oil and accelerate the separation of water while the oil temperature is relatively high.

In the second chamber 26, the separated and regenerated lubricating oil is adjusted to an oil temperature of 20 to 30°C, which provides the best vacuum performance.

During continuous operation, the oil temperature increases due to the sliding of the rotor 10 and the viscosity decreases, which adversely affects the degree of vacuum. Therefore, the temperature controller 29 opens and closes the cooling water solenoid valve 30 of the cooler 25 to cool the oil. let

Alternatively, although the heater 24 is not normally needed, the temperature regulator 29
The switch 31 is turned on to operate the heater 24 in response to the signal.

The temperature of the oil thus regenerated in the first chamber 22 is adjusted in the second chamber 26, and the oil supply solenoid valve 27 is actuated in response to a signal from the level meter 28 to circulate and supply clean lubricating oil into the main body 9.

Note that new lubricating oil is introduced into the drain separator 19 through the injection hole 32 to replenish the lubricating oil.

According to this device, the lubricating oil is transferred to the drain separator 19, moisture, sludge, etc. are separated and removed, and the temperature of the regenerated clean oil is adjusted to continuously circulate and supply the oil, so moisture is contained in the intake air. It is possible to continuously maintain the performance of the oil rotary vacuum pump 5 even if the oil rotary vacuum pump 5 is

Therefore, even if it is used in the degassing tower 1 and operated continuously, the degassing performance will not deteriorate as in the conventional case.

Next, the operating performance of a conventional deaerator and a deaerator according to the present invention will be compared and explained based on a specific experimental example.

As for the experimental apparatus, a conventional apparatus shown in FIG. 1 and an apparatus according to the present invention shown in FIG. 3 were compared.

The specifications of the experimental equipment are as follows.

Deaerator specifications Oil rotary vacuum position 05,5
Specifications Deaerated water capacity 707 Displacement filter 60t/m1
yt feed water inlet temperature 20℃ Ultimate pressure -a
x1cr' Tor r Circulating water flow rate 150 ports t/H Oil amount 2.3 to dissolved oxygen saturation → 10 ppb or less Electric motor 0.
75kW degassing tower 01,1 internal pressure 17.5 Torr 70 liters of raw water is injected into the degassing tower 01゜1 using the water supply pumps 08,8, and when the level reaches H level on the level meter, the water pumps 08,8 stop. .

The circulation pumps 02, 2 are operated, and the spray nozzles 04, 2 at the top are operated.
Water is injected from 4 and the oil rotary vacuum pumps 05 and 5 are operated.

Dissolved oxygen in the water is removed by maintaining the degree of vacuum in the degassing tower 01.1.

When dissolved oxygen (DO2) is below 10 pI)b, valve O is closed.
7 and 7 are opened to feed degassed water to the lower limit of the level meter, and raw water is replenished by the water supply pumps 08 and 8 again.

FIG. 5 is a comparison of the degassing performance of the conventional device and the device of the present invention, showing the operating time and the decrease in dissolved oxygen in water (solid line).

With the conventional device, it took about 18 hours for the dissolved oxygen (DO2) to drop to 10 ppb or less, but with the device of the present invention, it took only about 2 hours, which was a short time.

Furthermore, as shown by the solid line in the figure, the temperature of the oil is approximately 30°C in the device of the present invention, but reaches 60°C in the conventional method, and the amount of water mixed into the oil is approximately 300 to 500 m1/h, 1 ~2
Water had to be drained and fresh oil added every hour.

Table 1 shows a performance comparison of the conventional device of the present invention.

As can be seen from the above table, (1) the degassed water production capacity is approximately 10 times greater, and water can be collected in a shorter time than conventional methods.

(2) Oil deterioration is extremely small and consumption is low.

Therefore, continuous operation is possible without the need for oil changes.

(3) Failures and performance deterioration of the oil rotary vacuum pump 5 are almost eliminated.

(Conventionally, the rotor 010 was made of synthetic resin due to the moisture in the oil.
The vanes of the engine swelled, reducing vacuum performance, and the lubricating oil film was destroyed due to emulsion, resulting in frequent failures due to burning of rotating sliding parts.) (4) Easy to start in cold regions.

The present invention has been explained in detail above, and the present invention consists of a degassing tower that stores a predetermined amount of water in the lower part, circulates the water, and sprays it from the top; A degassing device consisting of an oil rotary vacuum pump in which lubricating oil is stored inside the lubricating oil, a cylinder is arranged in the lubricating oil, an intake port connected to the cylinder is opened outside the main body, and an exhaust port is opened in the lubricating oil. Provided is a degassing device, characterized in that the degassing device is equipped with a temperature adjustment means for adjusting the temperature of the lubricating oil, and a drain separator is disposed for taking out the lubricating oil from the main body, separating the oil and water, and circulating the oil into the main body. The drain separator removes water mixed into the lubricating oil, which prevents emulsions formed by mixing water and oil, prevents oil rotary vacuum pumps from seizing, and prevents deterioration of pump performance. Furthermore, since the lubricating oil is kept at a constant temperature, the oil rotary vacuum pump can be operated continuously, and the deaeration time can be greatly shortened.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional degassing device, Figure 2 is an enlarged view of section A in Figure 1, Figure 3 is a diagram showing an embodiment of the present invention, and Figure 4 is an enlarged view of part A in Figure 3. FIG. 5, an enlarged view of part B, is a graph comparing the performance of the conventional device and the device of the present invention. 01.1...Deaeration tower, 02,2...Circulation pump, 03,3゜8...Check valve, 04,4
...... Spray nozzle, 05,5... Oil rotary vacuum pump, 06,6... Mist separator,
7...Valve, 9...Body, 010,10
...Rotor, 011,11...Cylinder, 012,12...Lubricating oil, 013,13
...Intake hole, 014.14...Exhaust check valve, 015,15...Exhaust hole, 16...
...Drain, cock, 17...Drain pipe, 18
... Oil column feed pump, 19 ... Drain, separator, 20 ... Bulkhead, 21 ...
・Perforated plate, 22...First chamber, 23...
Temperature detector, 24... Heater, 25...
・Cooler, 26...Second chamber, 27...
Solenoid valve, 28...Oil detector, 29...
Temperature controller, 30...Cooling water solenoid valve, 31...
····switch.

Claims (1)

[Scope of utility model registration request] A degassing tower stores a predetermined amount of water at the bottom, circulates the water, and sprays it from the top, and the gas in the degassing tower is sucked in. Lubricating oil is stored inside the main body, and Sino Adder is contained in the lubricating oil. placed,
A deaerator comprising an oil rotary vacuum pump having an intake port connected to the cylinder opened outside the main body and an exhaust port opened in the lubricating oil, the deaerator comprising a temperature adjusting means for adjusting the temperature of the lubricating oil inside the main body. A degassing device characterized in that a drain separator is disposed to take out lubricating oil, separate it from oil and water, and circulate it into the main body.