JPH0318910Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a sampling device for a gas analyzer, and its purpose is to provide safety against load fluctuations in the front stage of the suction pump due to dust adhesion to the sampling probe or primary filter. The structure is simple and reliable, in order to perform the function of preventing condensate in the condensate discharge line from flowing into the gas analyzer line when the pressure inside the condensate separator decreases due to an increase in the load on the front stage of the suction pump. to provide high quality sampling equipment.

For load fluctuations in the front stage of the suction pump, probes and
There is a gradual increase in load due to dust adhesion to the secondary filter, and a rapid increase in load due to blockage of the sample gas conduit.

Conventional sampling devices have a safety function against sudden increases in load, but due to gradual increases in load, condensate from the drain discharge line could flow into the gas analyzer line.

That is, in the conventional sampling device, as shown in FIG. The sample gas is passed through a large volume drain separator A to separate the drain, and the separated drain is allowed to flow down to the drain pot 19 via the connecting pipe 16.The sample gas is passed through the mist catcher 8 and the filter 9, and then After dehumidifying and drying by cooling with a cooler 10, the pressure is maintained at a constant level with a constant pressure trap 14, and the drain is supplied to a gas analyzer 12 via a needle valve 11, and the drain in the drain pot 19 is connected to a drain discharge line. 15 supplies the low pressure trap 14, and the constant pressure trap 1
It was used as supplementary water for 4.

Therefore, due to blockage of the sample gas conduit 3, etc.
When the load on the front stage of the suction pump P suddenly increases, the atmosphere is sucked through the drain discharge line 15 and the drain in the drain pot 19 is sucked up into the drain separator A through the connecting pipe 16.
The volume of the drain separator A is set to be large enough to accommodate the sucked up drain, so after the drain is sucked up, only the atmosphere is sucked in and flows into the gas analyzer line 13. The safety function is demonstrated.

However, in response to a gradual increase in the load on the front stage of the suction pump P, the negative pressure inside the drain separator A increases (that is, the pressure decreases), and the water level in the connecting pipe 16 with the drain pot 19 gradually rises. , the drain separated in the drain separator A is not automatically discharged by gravity, and the connecting pipe 16 and the drain separator A are filled with drain. and,
Eventually, this will lead to an accident in which the condensate leaks into the gas analyzer line 13, and a great deal of time and money will be wasted in restoring each part of the sampling device and the gas analyzer to normal conditions.

As a configuration to eliminate the above conventional drawbacks, the second
As shown in the figure, a safety trap mechanism consisting of a water tank 20 and a vent pipe 21 with one end open to the atmosphere and the other end opened below the water surface is installed in the sample gas conduit 3 on the upstream side of the suction pump P. The first thing to consider is to provide one.

According to this configuration, due to a gradual increase in the load on the front stage of the suction pump P, the negative pressure inside the drain separator A increases and the drain in the drain pot 19 is sucked up, but the negative pressure inside the water tank 20 also increases and the water level rises. The water level in the ventilation pipe 21 drops and the drain pot 1
Immediately before the drain in the drain separator 9 flows into the drain separator A, air is sucked in from the vent pipe 21 and bubbling occurs, so the pressure in the drain separator A becomes almost equal to atmospheric pressure, and the drain that has been sucked up flows into the drain pot 19. Returning to , the atmosphere will flow through the gas analyzer line 13.

However, in the case of the above configuration, water in the water tank 20 may evaporate or conversely, condensate may be mixed in.
In order to reliably and stably perform the intended safety function, a means to maintain a constant water level is required, which inevitably increases the number of parts and complicates the structure of the device.

In view of the above points, the present invention has an extremely simple structure that exhibits a safety function.A drain separator is provided in the sample gas conduit upstream of the sampling suction pump, and the In a sampling device for a gas analyzer in which a cooler equipped with a constant pressure trap is provided in the sample gas conduit downstream of the suction pump, one tank is divided into upper and lower parts by funnel-shaped partition plates, and the upper compartment is divided into upper and lower compartments. is the drain separator, and this drain separator is provided with a gas inlet and a gas outlet, while the lower compartment is a drain storage chamber, and this drain storage chamber is provided with an overflow port, and one end is located above the overflow port. A vent pipe is provided which opens into the atmosphere at the top and opens into the drain at the other end, and further, the overflow port and the constant pressure trap are connected by a drain discharge line.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 3 shows a sampling device in the exhaust gas analyzer. In the figure, 1 is a probe installed with its tip facing the flue or other combustion exhaust gas flow path, 2 is a primary filter, and A is a drain separator inserted in the sample gas conduit 3 upstream of the suction pump P. A drain storage chamber B equipped with an overflow port b is integrally provided below it. The doluene storage chamber B is provided with a ventilation pipe 4 whose one end opens into the atmosphere at a position higher than the overflow port b and whose other end opens into the drain. This constitutes a safety trap mechanism against load fluctuations.

The drain separator A and the drain storage chamber B
The details are as follows.

That is, as shown in FIG.
The tanks 5 are divided into upper and lower parts by partition plates 6 in the shape of a funnel.
The upper compartment was provided with a gas inlet 7a and a gas outlet 7b to constitute the drain separator A, and the lower compartment was provided with a vent pipe 4 with an overflow port B to constitute the drain storage chamber B. It is.

In Figure 3, 8 is a mist catcher, 9 is a filter, 10 is an electronic cooler that cools and dehumidifies the sample gas, 11 is a needle valve, 12 is a gas analyzer, and 13 is a gas analyzer line. . 14
is a constant pressure trap that keeps the liquid level constant, and the drain pipe 10a of the electronic cooler is inserted to a certain position below the liquid level. The downstream end of the drain discharge line 15 led out from the drain storage chamber B is opened below the liquid level of the constant pressure trap 14, and the drain in the drain storage chamber B is configured to be used as makeup water for the constant pressure trap 14. It has been done.

According to the above configuration, the drain separated from the sample gas by the drain separator A flows down into the drain storage chamber B, and when the amount exceeds a certain level, it overflows and is supplied to the constant pressure trap 14. The liquid level of B is always kept constant.

When the pressure inside the drain separator A decreases due to a sudden load increase in the front stage of the suction pump P or a gradual load increase due to dust adhesion to the probe 1 or the primary filter 2,
The liquid level in vent pipe 4 drops and drain separator A
When the internal pressure drops to a certain value, the atmosphere is sucked from the vent pipe 4 into the drain storage chamber B, so the inside of the drain separator A is opened to the atmosphere, and the pressure becomes almost equal to atmospheric pressure, and the drain is drained. It can prevent it from flowing into the gas analyzer line.

FIG. 5 shows another embodiment. This embodiment is characterized in that an overflow port b is provided in the middle of the ventilation pipe 4 to further simplify the structure. Since the other configurations are the same as those in the previous embodiment, the same reference numerals are given to the same constituent members and the explanation thereof will be omitted.

As described above, according to the present invention, even if the pressure inside the drain separator decreases due to an increase in the load on the front stage of the suction pump, when the pressure inside the drain separator drops to a certain value, atmospheric air is sucked through the ventilation pipe. Since the inside of the drain separator is opened to the atmosphere, it is possible to prevent the inconvenience that would occur if the drain in the drain storage chamber is sucked up into the drain separator and flows into the gas analyzer line.

Moreover, the drain storage chamber is constantly replenished with drain separated by a drain separator, and excess drain overflows, so the liquid level in the drain storage chamber is automatically kept constant, and the water supply system, liquid level gauge, There is no need for a control device that automatically controls the water supply system based on the detection results of the liquid level gauge, or a complicated device for keeping the liquid level constant, and the simple configuration ensures that the above safety functions are achieved. be able to.

The drain overflowing from the drain storage chamber is supplied to the constant pressure trap via the drain discharge line, and can be used as makeup water to the constant pressure trap, eliminating the need to separately supply makeup water. Since condensate is prevented from being sucked up into the drain, the minimum volume required for the drain separator to separate the sample gas and condensate is sufficient, and this is extremely effective in improving the response of the gas analyzer. .

Furthermore, in the present invention, one tank is divided into upper and lower parts by funnel-shaped partition plates, the upper compartment is used as a drain separator, and this drain separator is provided with a gas inlet and a gas outlet, while the lower compartment is provided with a gas inlet and a gas outlet. Since the chamber is a drain storage chamber and the drain storage chamber is provided with an overflow port and a ventilation pipe, the structure is simple and this type of sampling device can be configured more compactly.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a sampling device in a conventional gas analyzer, Fig. 2 is a schematic diagram of the sampling device of Fig. 1 equipped with a safety trap mechanism, and Fig. 3 is an embodiment of the present invention. A schematic configuration diagram, FIG. 4 is a longitudinal sectional front view of the main part, and FIG. 5 is a longitudinal sectional front view of the main part showing another embodiment. 3...Sample gas conduit, 4...Vent pipe, 5...
...Tank, 6...Partition plate, 7a...Gas inlet, 7b...
...Gas outlet, 10...Electronic cooler, 14...Constant pressure trap, 15...Drain discharge line, P...Suction pump, A...Drain separator, B...Drain storage chamber, b...Overflow port.

Claims (1)

[Claims for Utility Model Registration] (1) A cooler equipped with a drain separator in a sample gas conduit upstream of a sampling suction pump and a constant pressure trap in the sample gas conduit downstream of the suction pump. In a sampling device for a gas analyzer, one tank is divided into upper and lower parts by a funnel-shaped partition plate, the upper compartment is used as the drain separator, and a gas inlet and a gas outlet are connected to the drain separator. At the same time, the lower compartment is a drain storage chamber, and in this drain storage chamber,
An overflow port is provided, and a vent pipe is provided with one end opening into the atmosphere above the overflow port and the other end opening into the drain, and further, a drain discharge line is provided between the overflow port and the constant pressure trap. A sampling device in a gas analyzer, characterized in that the sampling device is connected in a horizontal manner. (2) The sampling device for a gas analyzer according to claim (1), wherein the overflow port is provided in the middle of the vent pipe.