JPH10185777A - Device for taking-in sample gs for analysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a filter from clogging up for a long period. SOLUTION: An ejector 12 wherein the air supplied from a pressure gas source placed externally is blown out into a chimney 11 of a combustion furnace for a negative pressure to be generated is provided, and an introduction pipe 13 which incorporates a filter 14 communicated to a negative pressure chamber of the ejector 12 and provided in the chimney 11, a combustion gas is taken-in through the introduction pipe 13, and filtered fine particles out with the filter 14, supplied to an analyzing device, while provided in the introduction pipe 13 so that a filtering surface of the filter 14 is sucked by the ejector 12 so as to be parallel to the flow direction of the combustion gas flowing in the introduction pipe 13, and fast flow of combustion gas parallel to the filtering surface of the filter 14 is generated so that relatively large fine-particles contained in the combustion gas ride on the fast flow of combustion gas, for discharge from the ejector 12 to the chimney 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for introducing a test gas for analysis, and more particularly to a device for extracting a part of a gas containing fine particles by filtering through a filter and analyzing the components of the gas. The filter is disposed in the flow path of the gas and the temperature of the filter is set to the same temperature as the gas to be analyzed, and the gas containing fine particles flows at high speed by the ejector in parallel with the filtration surface of the filter. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for taking a test gas for analysis, which is capable of preventing clogging of a filtration filter due to fine particles for a long period of time by performing filtration while performing the filtration.

[0002]

2. Description of the Related Art Combustion gas generated in a combustion furnace is one of the causes of pollution, and its emission components are legally regulated. Dioxin, hydrochloric acid, chlorine gas, carbon monoxide, nitrogen oxide, sulfide Emission of harmful components such as hydrogen above a certain concentration is prohibited.

[0003] Therefore, in order to control harmful components in the exhaust gas from the combustion furnace to a certain concentration or less, it is common practice to analyze the components by appropriately sampling the exhaust gas during combustion.

A conventional exhaust sampling device 1 is shown in FIG.
1, a sampling hole 2a is provided in a chimney 2 of a combustion furnace (not shown), and a lid 3 to which a pipe 4 penetrating through and communicating with the inside and outside of the chimney 2 is fixed with bolts 6 via a packing 5, A filter 8 is disposed in the middle of the pipe 4 and a combustion gas 9 generated by combustion is sucked from the chimney 2 into the pipe 4 in the direction of arrow A, and is filtered by the filter 8 to remove dust having a size of 1 to 5 μm or more. After being removed, it is sent in the direction of arrow B and analyzed by a combustion gas component analyzer (not shown) connected to one end of the pipe 4.

[0005] All dust having a size of 1 to 5 µm or more contained in the combustion gas 9 supplied to the analyzer is collected by the filter 8, and therefore the filter 8 is easily clogged and must be replaced frequently. There was a disadvantage that it did not.

The filter 8 is made of, for example, filter paper, and is disposed outside the chimney 2 so that the filter 8 can be easily replaced. However, disposing the filter 8 outside the chimney 2 actually causes a serious problem. That is, the temperature of the filter 8 is usually low, such as about room temperature, and when the combustion gas 9 is sucked into the pipe 4 for analysis, the high-temperature combustion gas 9 comes into contact with the low-temperature filter 8 to filter the filter 8. Water is condensed on the surface and clogging is likely to occur, so that it becomes impossible to filter the combustion gas 9 at an early stage.

[0007] Therefore, the filter 8 must be replaced frequently, so that not only the maintenance of the filter 8 is expensive, but also the analysis work requires many man-hours.
There are many drawbacks, such as the need to constantly monitor the clogging condition of the device.

In order to prevent the above-mentioned condensation on the filter 8, a heater (not shown) is provided on the outer periphery of the pipe 4 outside the chimney 2.
Has been proposed to keep the temperature of the filter 8 at a high temperature, however, it is difficult to keep the temperature of the filter 8 at the same temperature as the temperature of the combustion gas 9. Even if the temperature is kept warm and dew condensation is prevented, the direction of gas flow to the filter 8 is always constant, and only the flow of gas to be sucked is always present around the filter 8. There is no function to remove dust trying to adhere to
The disadvantage that clogging of the filter 8 occurs at an early stage could not be eliminated.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned drawbacks of the prior art, and has as its object to dispose in a flow path for flowing a gas containing fine particles. The introduction pipe communicates with the negative pressure chamber of the ejector, the test gas is taken in from the introduction pipe by the suction action of the ejector, and further filtered by a filtration filter disposed in the introduction pipe to remove fine particles, and then analyzed. Supply to the analyzer to prevent clogging of the filtration filter for a long period of time, and to enable supply of a test gas containing no fine particles to the analyzer, thereby adversely affecting the analyzer. It is to be able to perform accurate analysis continuously without using it.

It is another object of the present invention to dispose an ejector for generating a negative pressure by ejecting a gas supplied from a pressure gas source disposed outside the combustion furnace in the chimney and to incorporate a filter. After the introduction pipe is communicated with the negative pressure chamber of the ejector and disposed in the chimney, the combustion gas is taken in from the introduction pipe together with the fine particles contained in the combustion gas, and the fine particles are removed by filtration with a filtration filter. By supplying to the analyzer, it is possible to supply combustion gas that does not contain fine particles to the analyzer, and thereby to prevent clogging of the filtration filter for a long time,
An object of the present invention is to enable continuous sampling and analysis of combustion gas, and to optimally control the combustion state so as to minimize harmful substances in the combustion gas.

Still another object is to dispose the introduction pipe together with the filtration filter in the chimney so that the temperature of the filtration filter can be filtered at the same temperature as the combustion gas as the test gas. In addition, it is intended to prevent dew condensation when the combustion gas touches the filtration filter and to prevent clogging of the filtration filter due to moisture contained in the combustion gas.

Another object of the present invention is to dispose a filtration surface in parallel with a flow direction of combustion gas sucked by an ejector and flowing through an introduction pipe, and dispose a filtration filter in the introduction pipe. A high-speed flow of the combustion gas parallel to the plane, so that the test gas can be filtered by passing through a filtration filter in a direction perpendicular to the high-speed flow of the combustion gas. The relatively large dust contained in the exhaust gas is discharged from the ejector into the chimney without contacting the filtration filter through the high-speed flow of combustion gas, preventing clogging of the filtration filter and maintaining the filtration performance for a long time At the same time, the frequency of replacing the filtration filter is significantly reduced as compared with the conventional example.

Still another object is to provide a washing circuit in which a compressed air source is connected via an on-off valve at a downstream side in a filtration direction of a filtration filter provided in a chimney, and the cleaning circuit is provided at predetermined intervals by a timer device. By supplying compressed air from the compressed air source to the filtration filter and flowing the compressed air in the opposite direction to the normal filtration, it is possible to remove fine particles adhering to the filtration filter, and thereby the clogging of the filtration filter is performed. Therefore, the frequency of replacing the filtration filter is greatly reduced as compared with the conventional example, and the maintenance work of the filtration filter is facilitated.

Still another object is to provide a three-way valve between the filtration filter and the analyzer, to close a sampling circuit or an intake pipe for communicating the filter with the analyzer, and to open the sampling pipe to the atmosphere. It is to be able to switch to an open circuit, and by this, at the time of backwashing supplying compressed air to the filtration filter from the opposite direction, the intake pipe was closed and the three-way valve was operated to open the sampling pipe to the atmosphere. After that, compressed air for backwashing is supplied to the analyzer so as to perform backwashing, and the suction side of the analyzer is prevented from being in a vacuum state, so that there is no influence of backwashing on the analyzer, Further, at the time of analysis, the three-way valve is operated without any support to connect the filtration filter with the analyzer so that the test gas can be supplied to the analyzer.

Still another object of the present invention is to make it possible to automatically perform analysis of a test gas and backwashing of a filtration filter by controlling and operating a three-way valve and an on-off valve by a timer device. Yes, and this allows the analyzer to operate in good condition with very little maintenance of the filter for very long periods of time.

Another object of the present invention is to provide an ejector that protrudes and is disposed in a mixture gas supply pipe for mixing particulate fuel with a gas and supplying the mixed gas with the gas to a combustion chamber of a combustion furnace for combustion. The filter surface is arranged in parallel with the flow direction of the gas sucked by the ejector in the introduction pipe which communicates with the negative pressure chamber at the other end and opens into the mixture supply pipe. Is filtered by the filtration filter and then supplied to the analyzer to generate a high-speed flow of the fuel gas in parallel with the filtration surface around the filtration filter to prevent the particulate fuel from adhering to the filtration surface. In addition, the clogging of the filtration filter is minimized, the frequency of replacing the filtration filter is significantly reduced as compared with the conventional example, and the maintenance work of the filtration filter is facilitated.

Still another object is to provide a washing circuit in which a pressure gas source is connected via an on-off valve on the downstream side in the filtration direction of a filtration filter provided in a mixture gas supply pipe, and a predetermined interval by a timer device. By supplying the pressure gas from the pressure gas source to the filtration filter and flowing the pressure gas in the opposite direction to the normal filtration, it is possible to remove the particulate fuel attached to the filtration filter, and An object of the present invention is to prevent clogging of a filtration filter and to greatly reduce the frequency of replacement of the filtration filter as compared with a conventional example.

[0018]

SUMMARY OF THE INVENTION In summary, the present invention (claim 1) relates to an analysis system for extracting a part of the gas from a flow path through which a gas containing fine particles flows to analyze components of the gas. In the sample gas intake apparatus, one end is opened in the flow path, and a nozzle for ejecting a gas supplied from a pressure gas source provided outside the flow path, and the nozzle is disposed so as to surround the nozzle. An ejector comprising a negative pressure chamber for generating a negative pressure by a jet flow from a nozzle, and the gas flowing through the flow path with one end communicating with the negative pressure chamber and the other end opening into the flow path. An introduction pipe for guiding a part of the gas to the negative pressure chamber by the negative pressure of the negative pressure chamber, and a part of the gas disposed in the introduction pipe and guided to the negative pressure chamber was filtered to remove the fine particles. After that, supply it to the analyzer installed outside the flow path It is characterized in that a peroxide filter.

According to the present invention (claim 2), there is provided a chimney which is attached to a combustion furnace and discharges combustion gas generated by combustion to the outside, and a pressurized gas which is disposed inside the chimney and is provided outside. An ejector comprising a nozzle for ejecting a gas supplied from a source into the chimney, a negative pressure chamber disposed surrounding the nozzle and generating a negative pressure by a jet flow from the nozzle, and one end of the ejector having the negative pressure An inlet pipe communicating with the chamber and having the other end opened into the chimney and sucking the combustion gas to lead to the negative pressure chamber; and the combustion gas disposed in the inlet pipe and guided to the negative pressure chamber. And a filtration filter for removing a fine particle contained in the combustion gas by filtering a part thereof and supplying the particulate matter to the analyzer.

According to a third aspect of the present invention, there is provided a chimney provided in a combustion furnace for discharging combustion gas generated by combustion to the outside, and a pressure gas protruding into the chimney and provided outside. An ejector comprising a nozzle for emitting gas supplied from a source into the chimney, a negative pressure chamber surrounding the nozzle and generating a negative pressure by a jet flow from the nozzle, and an ejector provided in the chimney. An introduction pipe having one end communicating with the negative pressure chamber and the other end opening into the chimney, sucking the combustion gas and guiding the combustion gas to the negative pressure chamber; and a flow direction of the combustion gas in the introduction pipe. A filtration filter that is provided in parallel with the filter, and that filters a part of the combustion gas guided to the negative pressure chamber to remove fine particles contained in the combustion gas, and then supplies the particulate to an analyzer. The combustion parallel to the filter surface By causing scan fast flow is characterized in that it has configured to prevent clogging by the fine particles of the filtration filter.

According to a fourth aspect of the present invention, there is provided a chimney provided in a combustion furnace for discharging combustion gas generated by combustion to the outside, and compressed air protruding into the chimney and disposed outside. An ejector comprising a nozzle for ejecting compressed air supplied from a source into the chimney, and a negative pressure chamber disposed surrounding the nozzle and generating a negative pressure by a jet flow from the nozzle; and An introduction pipe having one end communicating with the negative pressure chamber and the other end opening into the chimney, sucking the combustion gas and guiding the combustion gas to the negative pressure chamber; and a flow of the combustion gas in the introduction pipe. A filter provided with a filter surface parallel to the direction and filtering a part of the combustion gas guided to the negative pressure chamber to remove fine particles contained in the combustion gas and supplying the filtered gas to an analyzer; The combustion gas filtered by Is switched to a sampling circuit that connects the filtration filter and the analyzer via an air sampling tube and a sampling pipe so as to supply the filter to the analysis device, or an open circuit that closes the air sampling tube and opens the sampling pipe to the atmosphere. A three-way valve, a washing circuit that communicates with the filtration filter via an on-off valve and supplies compressed air from the compressed air source to the filtration filter, and switches the three-way valve at predetermined intervals to bring the sampling pipe to atmosphere. A timer device for opening the open / close valve after opening the open / close valve, supplying the compressed air from the compressed air source to the filtration filter, and removing the fine particles attached to the filtration filter by backwashing. It is characterized by having.

According to the present invention (claim 5), the present invention provides a gas mixture supply pipe in which a particulate fuel is mixed with a gas, the gas flows, and the gas is supplied to a combustion chamber of a combustion furnace for combustion. In the apparatus for taking in a gas for analysis for taking in a gas, a gaseous mixture supply pipe for supplying the particulate fuel to the combustion chamber together with the gas, and a gaseous mixture supply pipe protruding into the gaseous mixture supply pipe and disposed outside. An ejector comprising a nozzle for injecting a compressed gas supplied from the compressed gas source into the air-fuel mixture supply pipe, and a negative pressure chamber disposed surrounding the nozzle and generating a negative pressure by the jet flow from the nozzle. An introduction pipe disposed in the mixture gas supply pipe, one end of which communicates with the negative pressure chamber, and the other end of which opens into the mixture gas supply pipe, sucks the gas containing the fuel, and guides the gas to the negative pressure chamber. And the introduction pipe A filtration surface is provided in parallel with the flow direction of the gas, and a part of the gas containing the fuel guided to the negative pressure chamber is filtered to remove the particulate fuel, and then supplied to the analyzer. And a filter.

According to the present invention (claim 6), there is provided a mixture supply pipe in which a particulate fuel is mixed with a gas, the gas flows, and the mixture is supplied to a combustion chamber of a combustion furnace for combustion. In the apparatus for taking in a gas for analysis for taking in a gas, a gaseous mixture supply pipe for supplying the particulate fuel to the combustion chamber together with the gas, and a gaseous mixture supply pipe protruding into the gaseous mixture supply pipe and disposed outside. An ejector comprising a nozzle for injecting a compressed gas supplied from a pressurized gas source into the air-fuel mixture supply pipe, and a negative pressure chamber disposed surrounding the nozzle and generating a negative pressure by the jet flow from the nozzle. An introduction pipe disposed in the mixture gas supply pipe, one end of which communicates with the negative pressure chamber, and the other end of which opens into the mixture gas supply pipe, sucks the gas containing the fuel, and guides the gas to the negative pressure chamber. And the introduction pipe A filtration surface is provided in parallel with the flow direction of the gas, and a part of the gas containing the fuel guided to the negative pressure chamber is filtered to remove the particulate fuel, and then supplied to the analyzer. A filter, and a sampling circuit or the gas collection tube for communicating the filtration filter and the analysis device via a gas collection tube and a sampling pipe so as to supply the gas filtered by the filtration filter to the analysis device. A three-way valve that switches to an open circuit that opens the sampling pipe to the atmosphere, and a pressure gas from a pressure gas source that communicates with the filtration filter via an on-off valve and supplies the pressure gas from the pressure gas source to the filtration filter. And a washing circuit for removing the particulate fuel adhering to the filtration filter by flowing the filter, and switching the three-way valve at predetermined intervals to switch the sampler. A timer device for opening the on-off valve after opening an open circuit for opening the pressure pipe to the atmosphere, supplying the pressure gas to the filtration filter, and removing the particulate fuel adhering to the filtration filter by back washing. It is characterized by having.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. 1 to 5, an apparatus 10 for taking a test gas for analysis according to a first embodiment of the present invention includes a chimney 11, an ejector 12, an introduction pipe 13, a filtration filter 14, a three-way valve 15, The apparatus includes a cleaning circuit 16, a timer device 18, a nozzle 23, and a blower 26 as an example of a pressure gas source.

The chimney 11 transfers a combustion gas 21 containing fine particles 20 generated during combustion in the combustion furnace 19 to the outside 22 of the combustion furnace 19.
A conduit made of metal, refractory brick, concrete, etc., disposed continuously above the combustion furnace 19 to remove various harmful substances on the way. A plurality of filters (not shown) are respectively provided above and below the apparatus 10 for taking in a test gas for analysis according to the present invention.

The ejector 12 is for generating a negative pressure around the nozzle 23 by ejecting a gas such as compressed air from the nozzle 23, and is, for example, a metal pipe 24 having an inner diameter of 1 inch. And a nozzle 23 surrounding the nozzle 23 and having a tapered tip.
Negative pressure chamber 2 in which a test gas supply passage 25a is formed on the side of
And 5.

The nozzle 23 is for ejecting compressed air supplied in the direction of arrow C from the blower 26 which is an example of a pressure gas source disposed on the outside 22 in the direction of arrow D. 11a is screwed to the tip of a pipe 24 that penetrates a sealing plate 30 that is hermetically attached by bolts 29 via a packing 28 to an opening 11b provided in the opening 11b, and the inner diameter portion 23a is formed into a tapered shape. , Blower 26
Compressed air supplied from the stack 11 at high speed in the direction of arrow E.
It is designed to squirt in.

The pipe 24 is substantially threadedly fixed to both ends of a through flange 31 screwed by a fixing nut 32 through the sealing plate 30.

The negative pressure chamber 25 is for generating a negative pressure by the action of compressed air ejected from the nozzle 23, and is screwed to the nozzle 23 so as to surround the nozzle 23. The inner diameter 25a is formed so as to be gradually tapered as it goes forward in the direction in which the compressed air is ejected, so that the jet from the nozzle 23 is guided into the chimney 11.
The surrounding gas is discharged from the negative pressure chamber 25 by a high-speed jet of compressed air that is jetted out of the negative pressure chamber 25 to make the inside of the negative pressure chamber 25 a negative pressure.

The negative pressure chamber 25 is provided with a test gas supply passage 25a which is opened to the side. The introduction pipe 13 is connected through an elbow 33, and the combustion gas 21 is discharged from the introduction pipe 13. It is configured to be sucked and exhausted into the chimney 11.

The introduction pipe 13 is for supplying a combustion gas 21 which is an example of a test gas to be analyzed to the filter 14, and one end 13a is connected to an elbow 33 connected to the negative pressure chamber 25. The other end 13b is opened in the chimney 11, and the combustion gas 21 flowing in the chimney 11 is sucked from the open end 13c, and the compressed air ejected from the nozzle 23 through the negative pressure chamber 25 is injected into the chimney 11. The combustion gas 21 is always sucked from the opening end 13c toward the negative pressure chamber 25 while there is a jet flow from the nozzle 23.

The filtration filter 14 filters the combustion gas 21 in the chimney 11 and removes the fine particles 20 contained in the combustion gas 21.
Is a metal filter having a diameter of, for example, 20 mm and a length of about 180 mm, which blocks particles having a size of 5 μm or more. The filter surface 14a is disposed in the introduction pipe 13 in a direction perpendicular to the flow direction of the combustion gas 21 flowing through the introduction pipe 13, the front end 14b is closed, and the rear end 14c Has a sealing plate 30
A connecting pipe 35 having one end fixed to a through flange 33 screwed by a fixing nut 34 is connected therethrough, and the combustion gas 21 sucked from the open end 13 c is filtered by the filter surface 14.
While flowing as a high-speed flow parallel to a, a part of the combustion gas 21 is filtered by the filtration filter 14 to remove the fine particles 20,
It is designed to be supplied to an analyzer.

A T-shaped pipe 38 is connected to the outside of the chimney 11 of the through flange 47 through a connecting pipe 36, and one connecting port 38a of the T-shaped pipe 38 is connected to a compressed air source (FIG. The cleaning circuit 16 is formed by connecting a compressed air supply pipe 39 connected to a filter (not shown) to filter compressed air having a pressure of, for example, 2 kg / cm ³ from a compressed air source.
The inside of the filter 14 is supplied, and so-called "backwashing" is performed, in which compressed air flows from the inside to the outside of the filtration filter 14 in the direction opposite to the normal filtration. In the illustrated embodiment, the T-shaped pipe 38 is disposed outside the chimney 11. However, in order to prevent dew condensation in the gas flow path part having such a complicated structure, the chimney 11 is required. It is desirable to arrange inside.

A three-way valve 15 is connected to the other connection port 38b of the T-shaped tube 38 by an air collection tube 40.
A sampling pipe 41 communicating with the analyzer is connected to one of the ports 15a to form a sampling circuit 27, and a suction pump (not shown) mounted on the analyzer.
Of the combustion gas 21 flowing through the introduction pipe 13 at a flow rate of, for example, 5 L / min through the filter 14 in the direction of arrow H by the suction operation of the sampling circuit 2.
7 to the analyzer in the direction of arrow I.

A suction pipe 42 is connected to the other port 15b of the three-way valve 15 to form an open circuit 37. The suction pipe 40 is closed at the time of backwashing, and the sampling pipe 41 and the suction pipe 42 are connected to each other. The air supplied from the compressed air source to the filtration filter 14 is confined in the air collection tube 40, the air is sucked from the open circuit 37 and supplied to the analyzer, and the suction side of the analyzer is evacuated. To prevent and protect.

The timer device 18 includes a blower 26, a three-way valve 1
5 and an electric device such as the open / close valve 17. The blower 26 is connected to the power supply unit 43 via the open / close switch 44 by the conducting wire 45.
And an on-off valve 17 via a timer 46 via a lead 48,
49, and the timer 46 is
For example, inactive state to open the electric circuit for 57 minutes,
For three minutes, the system is operated so as to close the electric circuit.

When the open / close switch 43 is operated to close the blower 26, the blower 26 is energized and rotates in the direction of arrow K, compresses air and blows out from the nozzle 23 into the chimney 11 through the pipe 24. When the timer 46 is not operated, the on-off valve 17 is closed, and the three-way valve 15 is
0 and the sampling pipe 41 communicate with each other. When the timer 46 operates, the on-off valve 17 is opened and the air collection pipe 40 is closed, so that the suction pipe 42 and the sampling pipe 41 communicate with each other. I have.

6 and 7, when sampling the test gas, compressed air is blown from the blower 26 by an arrow C.
In the direction of arrow D from the nozzle 23 to generate a negative pressure in the negative pressure chamber 25, and the combustion gas 21 is discharged from the opening end 13 c of the introduction pipe 13 communicating with the negative pressure chamber 25 in the direction of arrow F. , And the area around the filter 14 is
4a, flow in the direction of arrow G at high speed,
, And is discharged into the chimney 11 in the direction of the arrow E together with the compressed air which is ejected from the nozzle 23 in the direction of the arrow D.

By flowing the combustion gas 21 at high speed in parallel with the filtration surface 14a of the filtration filter 14, relatively large fine particles 20 contained in the combustion gas 21 are removed from the filtration surface 1a.
This is for blowing back in the direction of arrow E into the chimney 11 without adhering to the chimney 4a, thereby preventing the filter 14 from being clogged.

A part of the combustion gas 21 sucked by the suction pump mounted on the analyzer and flowing at high speed around the filtration filter 14 is sucked through the filtration filter 14 in the direction of arrow H, and After the contained fine particles 20 are filtered by the filtration filter 14, the fine particles 20 are supplied to the analyzer in the direction of arrow I.

In FIG. 10, an apparatus 50 for taking in a test gas for analysis according to a second embodiment of the present invention includes a combustion furnace 5 for burning pulverized coal 51, which is an example of a particulate fuel, as fuel.
2 is an example applied to the analysis of the component of the fuel supplied to the combustion furnace 52 provided in the mixture gas supply pipe 53 of the second embodiment. In the first embodiment, the component is provided in the chimney 11 to analyze the component of the combustion gas 21. In order to prevent the discharge of harmful substances, the oxygen concentration of the gas supplied to the combustion furnace 52 together with the pulverized coal 51 is detected, and the oxygen concentration is controlled to a predetermined value or less to control the pulverized coal 5
1 is the same as the first embodiment except that it is configured to prevent the accidental explosion and to safely supply the fuel to the combustion furnace 52. Omitted.

The present invention is configured as described above,
Hereinafter, the operation will be described. The sample gas intake apparatus 10 for analysis according to the first embodiment of the present invention is shown in FIGS.
In the above, the combustion gas 21 incinerated in the combustion furnace 19 is guided into the chimney 11 and discharged to the outside 22. In order to control the harmful substances contained in the combustion gas 21 to a minimum, the combustion gas 21 A component analysis of 21 is performed.

That is, when the open / close switch 44 is operated and closed in the direction of the arrow J, the blower 26 is energized through the conducting wire 45 to rotate the blower 26 in the direction of the arrow K. It flows in the direction of arrow C, and gushes from the nozzle 23 in the direction of arrow D.

The gas in the negative pressure chamber 25 is discharged from the negative pressure chamber 25 into the chimney 11 with the jet of compressed air in the direction of arrow D from the nozzle 23, and the pressure in the negative pressure chamber 25 becomes negative. The combustion gas 21 flowing in the chimney 11 is sucked in the direction of arrow F from the open end 13c of the introduction pipe 13 and flows into the negative pressure chamber 25 in the direction of arrow G, and further together with the compressed air ejected from the nozzle 23 into the chimney 11. It is gushing.

While the blower 26 is rotating, the flow of the combustion gas 21 from the introduction pipe 13 to the negative pressure chamber 25 is continuously generated.

When the component analysis of the combustion gas 21 is being performed, the timer 46 is in a non-operating state, the on-off valve 17 is closed, and the three-way valve 15 is in a state where the intake pipe 40 and the sampling pipe 41 are communicated. When the analyzer is operated here, the suction pump mounted on the analyzer is operated to suck the gas in the filtration filter 14 in the direction of arrow I, and the pressure in the filtration filter 14 is reduced. The combustion gas 21 flowing in the introduction pipe 13 in the direction of arrow G passes through the filtration surface 14a of the filtration filter 14, flows into the filtration filter 14 in the direction of arrow H, and has a size of 5 μm or more contained in the combustion gas 21. The fine particles 20 are filtered and removed.

The combustion gas 21 after being filtered by the filtration filter 14 is sucked in the direction of arrow I at a flow rate of, for example, 5 liter / min, and comprises a connecting pipe 35, a T-shaped pipe 38, an intake pipe 40 and a sampling pipe 41. The sample is supplied to the analyzer via the sampling circuit 27 and the component analysis is performed.

Based on the analysis result, the temperature inside the combustion furnace 19, the amount of supplied air, and the like are controlled by a control device (not shown) so that the harmful substances contained in the combustion gas 21 are minimized. This analysis is also performed on the downstream side of the filter 57 in the chimney 11 and the like.

At this time, in FIG. 7 and FIG. 8, since the high-speed flow of the combustion gas 21 flows in the arrow G direction on the filtration surface 14a of the filtration filter 14 in parallel with the filtration surface 14a, Among the contained fine particles 20, relatively large fine particles 20 do not adhere to the filtration surface 14a,
The air is discharged from the negative pressure chamber 25 into the chimney 11 through the vicinity of the filtration filter 14, and does not needlessly adhere to the filtration surface 14a to prevent clogging.

Since the filter 14 is disposed in the chimney 11, the temperature of the filter 14 is always the same as the temperature of the combustion gas 21. Clogging is also prevented.

Therefore, the filter 14 hardly causes clogging, and the component of the combustion gas 21 can be analyzed by sampling continuously for an extremely long period of time. Control can be performed in a safe range with higher precision than before.

In FIG. 9, as described above, the component analysis of the combustion gas 21 is continuously performed, and after a predetermined time, for example, 57 minutes, the timer device 18 is operated to activate the three-way valve 1.
5 closes the intake pipe 40 and switches the suction pipe 42 and the sampling pipe 41 to communicate with each other to make the open circuit 37 effective. Then, the on-off valve 17 is opened and the compressed air source is opened, for example, at 2 kg / cm ³ . The compressed air is supplied to the inside of the filtration filter 14 in the direction of arrow L through the compressed air supply pipe 39.

The compressed air supplied to the inside of the filtration filter 14 flows through the filtration filter 14 in the direction of arrow M from the inside to the outside in the direction opposite to the normal filtration direction.
The fine particles 20 attached to the filter a are removed from the opening end 13c of the introduction pipe 13 in the direction indicated by the arrow F.
4 flows into the negative pressure chamber 25 together with the combustion gas 21 flowing in the direction of the arrow G at a high speed, is discharged into the chimney 11, and the filter 14 is backwashed.

At this time, the three-way valve 15 and the suction pipe 42
From the open circuit 37 composed of
The analyzer is protected by preventing the air from being sucked into the vacuum side of the analyzer.

The backwashing time of the filtration filter 14 is, for example, 3
When the particulates 20 adhered to the filtration filter 14 are removed after a predetermined time, the timer device 18 is operated again to close the on-off valve 17 and switch the three-way valve 15. The collection pipe 40 and the sampling pipe 41 are connected to each other to return to the original state, and the analysis of the combustion gas 21 is restarted.

Thereafter, the above-described operation is repeatedly performed at predetermined time intervals set in the timer device 18 so that the filtration filter 14 is not clogged and the combustion gas
One analysis can be performed.

The test gas intake device 50 of the second embodiment.
Performs an analysis of a gas mixture 54 supplied to a combustion furnace 52 that burns pulverized coal 51 as fuel in FIG.
The mixed gas 54 is burned so as to be most efficiently burned in the combustion furnace 52.
Is controlled.

The pulverized coal 51 is mixed with the mixed gas 54 in the combustion furnace 5.
If the pulverized coal 51 is transported in a state containing excessive oxygen when supplied to the pulverized coal 2, the pulverized coal 51 may react with the pulverized coal 51 and burn explosively in an extreme case. Is supplied to the combustion furnace 52 in a safe state in which the oxygen concentration is controlled to a certain value or less.

The mixed gas 54 containing the pulverized coal 51 is mixed with nitrogen gas from a nitrogen gas supply device (not shown), and is sent through the mixed gas supply pipe 53 in the direction of arrow O by the pressure feed device, and is burned in the combustion furnace 52. However, the test gas intake device 50 disposed in the mixture gas supply pipe 53 operates in the same manner as described in the first embodiment, and the blower 26 rotating in the arrow K direction causes the ejector 12 to move in the arrow P direction. Is discharged into the air-fuel mixture supply pipe 53 in the direction of arrow Q, and accordingly, the mixed gas 5 containing the pulverized coal 51 in the air-fuel mixture supply pipe 53 is discharged.
4 is sucked in the direction of the arrow R from the opening end 13c of the introduction pipe 13 and further flows into the negative pressure chamber 25 in the direction of the arrow S so that the nozzle 2
3 and is discharged in the direction of arrow Q after being mixed with the jet air.

Here, the analyzer is operated, and the mixed gas 54 containing the pulverized coal 51 is sucked through the filter 14, whereby the pulverized coal 51 is filtered by the filter 14, and only the mixed gas 54 is analyzed. Is supplied in the direction of arrow T via a gas collection tube 40 and a sampling pipe 41 to analyze the oxygen concentration.

When the measured oxygen concentration is higher than a predetermined value, a larger amount of nitrogen gas is supplied from the nitrogen gas supply device to control the oxygen concentration of the mixed gas 54 to a predetermined oxygen concentration. I do.

At this time, the mixed gas 54 containing the pulverized coal 51 sucked from the introduction pipe 13 flows at high speed in parallel with the filtration surface 14a of the filter 14, so that the pulverized coal 51
Is less likely to adhere to the filtration surface 14a, and only the pulverized coal 51 contained in the mixed gas 54 sucked by the analyzer is filtered, so that the filter 14 does not become clogged for a long time. .

The filtration filter 14 is connected to the air-fuel mixture supply pipe 5.
3, the temperature is the same as that of the mixed gas 54, and when the mixed gas 54 comes into contact with the filtration filter 14, there is no condensation, and clogging occurs due to moisture contained in the mixed gas 54. Not even.

When the analysis of the gas mixture 54 has been performed for a predetermined time, for example, 57 minutes, the timer device 18 is operated to activate the three-way valve 1.
5 closes the intake pipe 40, switches the suction pipe 42 to communicate with the sampling pipe 41, and activates the open circuit 37. After that, the on-off valve 17 is opened and the compressed air source compresses, for example, 2 kg / cm ³ . Air is supplied to the inside of the filter 14 in the direction of arrow U through the compressed air supply pipe 39.

The compressed air supplied to the inside of the filtration filter 14 in the direction of arrow U flows through the filtration filter 14 from the inside to the outside in the direction opposite to the normal filtration direction, and
The pulverized coal 51 adhering to a is removed, flows into the negative pressure chamber 25 in the direction of the arrow S together with the gas mixture 54 sucked from the opening end 13c of the introduction pipe 13 and flowing around the filter 14 at a high speed, and further supplies the gas mixture. After being discharged into the pipe 53, the filtration filter 14 is backwashed.

At this time, although the air collection tube 40 is closed, external air is sucked from the suction pipe 42 as shown by the arrow V and flows to the sampling pipe 41, so that the suction side of the analyzer does not become a vacuum state. , The analyzer is protected.

When the backwashing time set in the timer device 18, for example, three minutes, elapses, the timer device 18 is operated again to close the on-off valve 17, and the three-way valve 15 is switched to switch the air sampling pipe 40 and the sampling pipe 41. Are returned to the original state, and the analysis of the mixed gas 54 is restarted.

In the above embodiment, the test gas intake apparatus analyzes the components of the combustion gas in the chimney of the combustion furnace or the mixture gas containing pulverized coal in the mixture supply pipe supplied to the combustion furnace. Although described as a sample gas intake device is not limited to the above embodiment, for example, a gas containing fine particles, such as a device for measuring the concentration of oxygen, carbon monoxide and the like in a kiln of a cement manufacturing plant. It can be used everywhere in the apparatus for taking in the test gas for analysis that is filtered and taken out of the apparatus.

[0069]

As described above, according to the present invention, the introduction pipe is communicated with the negative pressure chamber of the ejector disposed in the flow path for flowing the gas containing fine particles as described above, and the sample gas is introduced from the introduction pipe by the suction action of the ejector. After removing the fine particles by filtering through a filtration filter arranged in the introduction pipe, and then supplying the same to the analyzer, clogging of the filtration filter can be prevented for a long time and fine particles are contained. There is an effect that an untested gas can be supplied to the analyzer, and as a result, accurate analysis can be continuously performed without adversely affecting the analyzer.

In addition, an ejector for emitting a gas supplied from a pressure gas source provided outside the combustion furnace to generate a negative pressure is provided in the chimney, and an introduction pipe having a built-in filtration filter is connected to the ejector. After being connected to the negative pressure chamber and disposed in the chimney, the combustion gas is taken in from the introduction pipe together with the fine particles contained in the combustion gas, filtered to remove the fine particles, and then supplied to the analyzer. Therefore, there is an effect that combustion gas containing no fine particles can be supplied to the analyzer, and as a result, clogging of the filtration filter can be prevented for a long time, so that combustion gas can be continuously sampled and analyzed, and combustion can be performed. There is an effect that the combustion state can be optimally controlled so as to minimize harmful substances in the gas.

Further, since the introduction pipe is arranged in the chimney together with the filter, the temperature of the filter can be filtered at the same temperature as the combustion gas which is the test gas. As a result, the combustion gas passes through the filter. Since dew condensation when touched can be prevented, there is an effect that clogging of the filtration filter by moisture contained in the combustion gas can be prevented.

Further, since the filtration surface is arranged in parallel with the flow direction of the combustion gas sucked by the ejector and flowing through the introduction pipe, and the filtration filter is arranged in the introduction pipe, the combustion gas is parallel to the filtration surface of the filtration filter. The high-speed flow of the combustion gas has the effect of allowing the test gas to be filtered by passing through a filter in a direction perpendicular to the high-speed flow of the combustion gas. As a result, relatively large dust contained in the combustion gas is burned. Since the gas is discharged from the ejector into the chimney without contacting the filter with the high-speed flow of gas, clogging of the filter can be prevented, filtration performance can be maintained for a long time, and the frequency of replacement of the filter is reduced. There is an effect that it can be significantly reduced as compared with the conventional example.

Further, a washing circuit is connected to a compressed air source via an on-off valve at a downstream side of the filtration filter arranged in the chimney in the filtering direction, and the timer is connected to the compressed air source at a predetermined interval. Compressed air is supplied to the filtration filter from above, so that the compressed air flows in the opposite direction to the normal filtration, which has the effect of removing fine particles adhering to the filtration filter. As a result, the clogging of the filtration filter is more effectively prevented. As a result, there is an effect that the frequency of replacing the filtration filter can be significantly reduced as compared with the conventional example, and the maintenance work of the filtration filter can be facilitated.

Since the three-way valve is provided between the filtration filter and the analyzer, a sampling circuit for communicating the filtration filter with the analyzer or an open circuit for closing the sampling pipe and opening the sampling pipe to the atmosphere are provided. It can be switched, and as a result, at the time of backwashing in which compressed air is supplied to the filtration filter from the reverse direction, the air intake pipe is closed, the three-way valve is operated to open the sampling pipe to the atmosphere, and then backwashing is performed. Therefore, it is possible to prevent the compressed air for backwashing from being supplied to the analyzer and to prevent the suction side of the analyzer from being in a vacuum state, so that there is no influence of the backwash on the analyzer, and there is no support during analysis. However, there is an effect that the test gas can be supplied to the analyzer by operating the three-way valve to communicate the filtration filter with the analyzer.

Further, since the three-way valve and the on-off valve are controlled and operated by the timer device, the analysis of the test gas and the backwashing of the filtration filter can be performed automatically. There is an effect that the analyzer can be operated in a good state with almost no labor required for maintenance of the filter during the period.

Further, an ejector is provided so as to protrude in a mixture gas supply pipe for mixing the particulate fuel into a gas, supplying the gas to the combustion chamber of the combustion furnace and burning the gas together with the gas, and having one end connected to the negative pressure chamber of the ejector. A filtration surface is disposed in parallel with the flow direction of the gas sucked by the ejector in an introduction pipe communicating with the other end of the mixture gas supply pipe, and a filter is disposed. Since the filter is supplied to the analyzer after filtration, a high-speed flow of the fuel gas is generated around the filter in parallel with the filter surface, thereby preventing the particulate fuel from adhering to the filter surface, As a result, clogging of the filtration filter can be minimized, the frequency of replacement of the filtration filter can be significantly reduced as compared with the conventional example, and the maintenance work of the filtration filter can be facilitated.

Further, a washing circuit is connected to a pressure gas source via an on-off valve on the downstream side in the filtration direction of the filtration filter provided in the mixture gas supply pipe. Since the pressurized gas is supplied from the gas source to the filtration filter and the pressure gas is caused to flow in a direction opposite to the normal filtration, there is an effect that particulate fuel adhering to the filtration filter can be removed. There is an effect that clogging can be prevented and the frequency of replacing the filter can be significantly reduced as compared with the conventional example.

[Brief description of the drawings]

FIGS. 1 to 9 relate to a first embodiment of the present invention, and FIG. 1 is a longitudinal sectional view including an apparatus for taking in a test gas for analysis and its electric circuit.

FIG. 2 is a partial longitudinal sectional view of the ejector device.

FIG. 3 is a partial longitudinal sectional side view of an apparatus for taking in a test gas for analysis attached to a chimney.

FIG. 4 is a vertical sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is an exploded perspective view of a main part of an apparatus for taking in a test gas for analysis.

FIG. 6 is a partial vertical cross-sectional view showing a gas flow state in an apparatus for taking in a test gas for analysis at the time of sampling the test gas.

FIG. 7 is an enlarged partial longitudinal sectional view showing a gas flow state near a filter at the time of sampling a test gas.

FIG. 8 is a vertical cross-sectional view including an electric circuit of an apparatus for taking in a test gas for analysis, showing an operation at the time of backwashing of a filtration filter.

FIG. 9 is an enlarged longitudinal sectional view of a main part showing a gas flow state at the time of backwashing of the filtration filter.

FIG. 10 relates to a second embodiment of the present invention, in which a particulate gaseous fuel is mixed with a gas, supplied, and burned. It is a longitudinal cross-sectional view including the electric circuit.

FIG. 11 is a longitudinal sectional view of an apparatus for taking a test gas for analysis attached to a chimney according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Intake apparatus of test gas 11 Chimney which is an example of a flow path 12 Ejector 13 Introducing pipe 13a One end 13b The other end 14 Filtration filter 14a Filtration surface 15 Three-way valve 16 Cleaning circuit 17 On-off valve 18 Timer device 19 Combustion furnace 20 Fine particles 21 Combustion Gas 22 External 23 Nozzle 25 Negative pressure chamber 26 Blower as an example of a pressurized gas source 27 Sampling circuit 40 Suction pipe 41 Sampling pipe 37 Open circuit 50 Intake apparatus for test gas 51 Pulverized coal as an example of particulate fuel 52 Combustion furnace 53 Mixture supply pipe

Claims (6)

[Claims] An apparatus for taking in a sample gas for analysis for extracting a part of said gas to the outside from a flow path for flowing a gas containing fine particles and analyzing a component of said gas, one end of which is located inside said flow path. A nozzle for discharging gas supplied from a pressure gas source disposed outside the flow path, and a negative pressure chamber surrounding the nozzle and generating a negative pressure by the discharge flow from the nozzle And one end of which is communicated with the negative pressure chamber and the other end is opened in the flow path, and a part of the gas flowing in the flow path is negatively charged by the negative pressure of the negative pressure chamber. An introduction pipe leading to the pressure chamber, and a part of the gas disposed in the introduction pipe and led to the negative pressure chamber is filtered to remove the fine particles, and then supplied to an analyzer disposed outside the flow path. Analysis filter, comprising: Gas of the intake system. 2. A chimney provided in a combustion furnace for discharging combustion gas generated by combustion to the outside, and a gas supplied from a pressure gas source protruding into the chimney and provided outside. An ejector including a nozzle to be ejected into the chimney and a negative pressure chamber disposed to surround the nozzle and generating a negative pressure by an ejected flow from the nozzle; one end communicating with the negative pressure chamber; An introduction pipe that opens into the chimney and sucks the combustion gas to lead to the negative pressure chamber, and a part of the combustion gas that is disposed inside the introduction pipe and is guided to the negative pressure chamber and is filtered. An apparatus for taking in a test gas for analysis, comprising: a filter for removing fine particles contained in the combustion gas and supplying it to the analyzer. 3. A chimney provided in a combustion furnace for discharging combustion gas generated by combustion to the outside, and a gas supplied from a pressurized gas source protruding into the chimney and provided outside. An ejector including a nozzle to be ejected into the chimney and a negative pressure chamber disposed to surround the nozzle and generating a negative pressure by the jet flow from the nozzle; and an ejector disposed in the chimney and having one end disposed at the negative pressure chamber. The other end is opened in the chimney, and an inlet pipe is provided for sucking the combustion gas and leading it to the negative pressure chamber, and a filter surface is provided in the inlet pipe in parallel with the flow direction of the combustion gas. A filtration filter for filtering a part of the combustion gas guided to the negative pressure chamber and removing fine particles contained in the combustion gas, and then supplying the filtered gas to an analyzer.
An apparatus for introducing a test gas for analysis, wherein a high-speed flow of the combustion gas is generated in parallel with a filtration surface of the filtration filter to prevent clogging of the filtration filter with the fine particles. 4. A chimney provided in a combustion furnace for discharging combustion gas generated by combustion to the outside, and compressed air supplied from a compressed air source protruded into the chimney and provided outside. An ejector including a nozzle to be ejected into the chimney and a negative pressure chamber surrounding the nozzle and generating a negative pressure by an ejection flow from the nozzle; and an ejector disposed in the chimney and having one end provided with the negative pressure. An inlet pipe communicating with the chamber and having the other end opened into the chimney, sucking the combustion gas and guiding the suction gas to the negative pressure chamber; and a filtration surface disposed in the introduction pipe in parallel with the flow direction of the combustion gas. A filtration filter for filtering a part of the combustion gas introduced to the negative pressure chamber to remove fine particles contained in the combustion gas, and then supplying the filtered gas to an analyzer; and Supply to the analyzer A three-way valve for switching the filtration filter and the analyzer to a sampling circuit that connects the sampling filter and the analysis pipe via a sampling pipe or an open circuit that closes the sampling pipe and opens the sampling pipe to the atmosphere, and an opening and closing valve. A cleaning circuit that communicates with the filtration filter and supplies compressed air from the compressed air source to the filtration filter, and an opening circuit that switches the three-way valve at predetermined intervals to open the sampling pipe to the atmosphere. And a timer device for opening the on-off valve and supplying the compressed air from the compressed air source to the filtration filter to remove the fine particles attached to the filtration filter by backwashing. Sample gas intake device. 5. A test gas for analysis which incorporates a gas in a mixture gas supply pipe which mixes a particulate fuel with a gas, flows the gas, and supplies the gas together with the gas to a combustion chamber of a combustion furnace for combustion. And an air-fuel mixture supply pipe that supplies the particulate fuel together with the gas to the combustion chamber, and is supplied from a compressed gas source that protrudes into the air-fuel mixture supply pipe and is externally provided. An ejector comprising a nozzle for injecting the compressed gas into the air-fuel mixture supply pipe, a negative pressure chamber surrounding the nozzle and generating a negative pressure by the jet flow from the nozzle, and an ejector provided in the air-fuel mixture supply pipe. An introduction pipe having one end communicating with the negative pressure chamber and the other end opening into the air-fuel mixture supply pipe, sucking the gas containing the fuel, and leading the gas to the negative pressure chamber; Gas flow direction and flatness And a filtration filter for filtering a part of the gas containing the fuel guided to the negative pressure chamber to remove the fuel in the form of fine particles and supplying the filtered fuel to an analyzer. A sample gas intake device for analysis. 6. A test gas for analysis which incorporates a gas in a gas mixture supply pipe which mixes a particulate fuel with a gas, makes the gas flow, and supplies the gas together with the gas to a combustion chamber of a combustion furnace for combustion. And an air-fuel mixture supply pipe that supplies the particulate fuel together with the gas to the combustion chamber, and is supplied from a pressure gas source that protrudes into the air-fuel mixture supply pipe and is externally provided. An ejector comprising a nozzle for injecting the compressed gas into the air-fuel mixture supply pipe, a negative pressure chamber surrounding the nozzle and generating a negative pressure by the jet flow from the nozzle, and an ejector provided in the air-fuel mixture supply pipe. An introduction pipe having one end communicating with the negative pressure chamber and the other end opening into the air-fuel mixture supply pipe, sucking the gas containing the fuel, and leading the gas to the negative pressure chamber; Gas flow direction and flatness A filter for disposing a filter surface, filtering a part of the gas containing the fuel guided to the negative pressure chamber to remove the particulate fuel, and then supplying the filtered gas to the analyzer; A sampling circuit or a sampling circuit that connects the filtration filter and the analysis device via an air collection tube and a sampling pipe so as to supply the sampled gas to the analysis device, or the gas collection tube is closed to open the sampling pipe to the atmosphere. A three-way valve that switches to an open circuit, and communicates with the filtration filter via an on-off valve to supply a pressure gas from a pressure gas source to the filtration filter and flow the gas in a direction opposite to the normal filtration to the filtration filter. A cleaning circuit for removing the adhered particulate fuel, and switching the three-way valve at predetermined intervals to open the sampling pipe to the atmosphere. A timer device for opening the on-off valve after supplying the discharge circuit, supplying the pressurized gas to the filtration filter, and removing the particulate fuel adhering to the filtration filter by backwashing. A sample gas intake device for analysis.