JP3067543B2 - Smoke gas sampling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to sampling of flammable gas generated from an incinerator or the like, and more particularly to a sampling apparatus for analyzing the composition of flammable gas containing tar components and the like.
About the.

[0002]

2. Description of the Related Art In the case of analyzing the composition of a flammable gas, if the sampled gas is directly introduced into an analyzer, dust in the gas,
Accurate analysis is not possible due to fouling of mist, tar, moisture, etc., and it may cause a failure.In general, use some kind of sampling device before introducing gas into the analyzer.
Necessary preprocessing is performed.

As shown in FIG. 2, this type of sampling apparatus is such that a cleaning liquid pumped by a cleaning liquid pump 24 is passed through an ejector 23, and a sample gas drawn out of a collection pipe 22 of an incinerator 21 by its suction action. After mixing, the dust and mist in the gas are dissolved in the cleaning liquid and transferred to the gas-liquid separation tank 25, and the cleaning liquid is directly discharged from the discharge port 26, while the separated sample gas is sucked by the gas suction pump 27. There is a device that is introduced into the analyzer 28 and performs analysis and measurement.

[0004]

The above-mentioned ejector 23
In the method of dissolving and cleaning by mixing the cleaning solution and the sampled gas with only the cleaning solution, the cleaning effect is not obtained due to insufficient mixing of the two, and particularly, the remaining tar component which cannot be completely dissolved is measured by the analyzer 28.
The sample adhered to the inner wall portion of the sample gas introduction pipe and the surface of the sensor portion to cause measurement failure, and further caused a failure.

Further, since the piping from the gas-liquid separation tank 25 to the gas suction pump 27 has a negative pressure, air flows in from a joint of the piping and mixes with the sampled gas, thereby accurately analyzing the oxygen concentration and the like. There was a problem that can not be.

[0006]

[MEANS FOR SOLVING THE PROBLEMS] Apparatus for analyzing smoke gas
Connected to a small hole provided in the furnace wall of an incinerator etc.
Gas that sucks smoke gas from the sampling pipe and mixes it with the cleaning liquid
An ejector with a suction port and a liquid suction port is placed at the front stage
Then, in the subsequent stage, a rectangular plate was twisted 180 ° in the pipeline
Mixing elements with different shapes
Stir dissolution cleaning by placing a static mixer
After that, place a gas-liquid separation tank and turn to the liquid layer.
Gas-liquid separation is performed and one of the separated cleaning liquids
Is arranged so as to suck from the bottom of the gas-liquid separation tank
The constant pressure / quantity is determined by the
It has a circulating mechanism that is pumped and reused. further
Connect a water bubbling device between the gas-liquid separation tank and the analyzer.
Placed in the gas layer of the gas-liquid separation tank.
The other sampling gas is bubbled with positive pressure
Dive into the water of the equipment and then the head with excess gas exhaust
Has a mechanism to be introduced into the analyzer after being pumped to the
You.

[0007]

[Function] In the sampling of flammable gas, in order to enhance the washing effect of the contained tar, the stirring and dissolving effect is improved by disposing a static mixer in the subsequent stage connected to the ejector in the preceding stage. Are formed into finer bubbles, and sufficient gas-liquid contact is performed, whereby a sufficient dissolving and cleaning action can be obtained.

Further, by circulating the cleaning liquid, a positive pressure corresponding to the amount of the sample gas sucked by the ejector is obtained in the gas layer in the gas-liquid separation tank. The sample gas can be introduced into the analyzer at a positive pressure from the gas layer, and the inflow of external air can be prevented.

Further, a water bubbling device is disposed to remove the cleaning liquid droplets mixed in the sample gas, and the water droplets are removed by immersing in the water, and the excess and the pulsating flow of the pumped sample gas are removed by a header. And exhausted from the excess gas exhaust pipe to supply a fixed amount of sample gas to the analyzer.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a block diagram of a smoke gas sampling apparatus according to the present invention. Reference numeral 1 denotes an incinerator, and reference numeral 2 denotes a sampling pipe for sampling smoked gas attached to a small hole provided in the wall of the furnace. Reference numeral 3 denotes an ejector, and reference numeral 7 denotes a high-pressure water turbo type cleaning liquid circulation pump.

The cleaning liquid circulation pump 7 has a suction port connected to the liquid layer portion 6 of the gas-liquid separation tank 5 via a pipe, and one discharge port connected to the ejector 3 via a flow control valve 8 via a pipe. I have. The ejector 3 is connected by a pipe to a static mixer 4 (trade name: water jet mixer manufactured by Noritake Co., Ltd.), and the static mixer 4 is connected by a pipe to the liquid layer 6 of the gas-liquid separation tank 5. ing. The gas layer 9 of the gas-liquid separation tank 5 is further connected to a water bubbling device 10, a header 11, and an analyzer 13 in this order.

In order to sample the smoke gas in the furnace, first, the sampling pipe 2 is connected to a small hole provided in the furnace wall, and the cleaning liquid circulation pump 7 is operated. Cleaning liquid circulation pump 7
Sucks the liquid layer 6 of the gas-liquid separation tank 5 and sends the cleaning liquid to the ejector 3 under pressure.

In the ejector 3, a back pressure is generated due to the flow rate of the cleaning liquid, and the smoke gas from the incinerator 1 is sucked from the sampling pipe 2 and mixed with the cleaning liquid at the preceding stage. Subsequently, the mixture of the flammable gas and the cleaning liquid sampled by the ejector 3 is introduced into the static mixer 4 to be further stirred and dissolved, and the sample gas becomes fine and uniform bubbles to provide sufficient cleaning liquid. Gas-liquid contact is performed, and tar and the like are dissolved in the cleaning liquid and discharged to the gas-liquid separation tank 5.
The mixture is separated into a sample gas and a cleaning liquid in the gas-liquid separation tank 5.

The flow rate of the cleaning solution passing through the ejector 3 is
It is adjusted by the opening degree of the flow control valve 8. By increasing or decreasing the flow rate of the cleaning liquid, the amount of gas to be suctioned is increased or decreased, and the size of bubbles generated by mixing changes, and the degree of cleaning is adjusted. The flow rate of the cleaning liquid may be adjusted by controlling the rotation speed of the cleaning liquid circulation pump 7 with an inverter instead of the flow rate adjusting valve 8.

Further, the cleaned sample gas in the gas layer 9 of the gas-liquid separation tank 5 is pumped into the water of the water bubbling device 10 by the positive pressure in the gas-liquid separation tank 5.

The purpose of the water bubbling device 10 is to remove the washing liquid droplets. To enhance the effect, a baffle plate or a perforated plate is provided in the water bubbling device 10 to increase the amount of bubbling. In addition, the effect of removing the cleaning liquid droplets can be improved.

The sample gas is further sent to the header 11 under pressure. Here, an excess gas exhaust pipe 12 is provided in the header 11 for removing excess gas and pulsating flow, and only a certain amount of the sample gas is sent to the analyzer 13. The surplus sample gas is discharged from the surplus gas exhaust pipe 12 to the atmosphere.

The cleaning liquid in the liquid layer section 6 of the gas-liquid separation tank 5 is sucked by the cleaning liquid circulation pump 7 and returned to the gas-liquid separation tank 5 through the ejector 3 and the static mixer 4 for recycling. Is done. In addition, when the cleaning liquid in the liquid layer part 6 of the gas-liquid separation tank 5 becomes more polluted,
Replace the washing solution.

By selecting water, an aqueous solution of caustic soda, an alkaline cleaning solution, a surfactant solution, a neutral detergent solution, etc. according to the properties of the sample gas, a further cleaning effect can be achieved.

[0020]

According to the present invention, since the cleaning ability is improved by connecting the ejector and the static mixer, the sampling of the smoky gas containing a large amount of tar and the like cannot be performed by the conventional method using only the ejector. Can respond to.

Further, since the gas is introduced into the analyzer by using the positive pressure of the gas-liquid separation tank instead of the conventional gas suction pump, air does not flow in from the pipe connection. Further, since a gas suction pump is not required, the number of locations requiring maintenance can be reduced and the apparatus can be simplified, so that an inexpensive sampling apparatus can be provided.

Further, by installing the water bubbling device, the effect of separating the washing liquid in the sample gas and the effect of stabilizing the supply of the sample gas to the analyzer by installing the header can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a smoke gas sampling device of the present invention.

FIG. 2 is a configuration diagram showing a conventional smoke gas sampling device.

[Explanation of symbols]

 1,21 Incinerator 2,22 Sampling pipe 3,23 Ejector 4 Static mixer 5,25 Gas-liquid separation tank 6 Liquid layer part 7 Cleaning liquid circulation pump 8 Flow control valve 9 Gas layer part 10 Water bubbling device 11 Header 12 Surplus Gas exhaust pipe 13,28 Analyzer 24 Cleaning liquid pump 26 Outlet 27 Gas suction pump

Claims (1)

(57) [Claims] A small hole provided in a furnace wall of an incinerator (1) or the like.
Smoke gas is absorbed from the sampling pipe (2) connected to the
An ejector (3) that mixes with the smoky gas
A static mixer (4) for further stirring the washing solution,
Separates the smoke gas into the cleaning solution and the sample gas
Gas-liquid separation tank (5), gas layer of gas-liquid separation tank (5)
Cleaning mixed in sample gas transferred from section (9)
A water bubbling device (10) for removing liquid droplets and a sump
Header (1) for exhaust adjustment of excess gas and pulsating flow
1) and excess gas exhaust pipe (12)
And further washed from the liquid layer (6) of the gas-liquid separation tank (5).
Cleaning by sucking the purified liquid and pumping it to the ejector (3)
A smoke gas comprising a liquid circulation pump (7).
Sampling equipment.