JP3258280B2 - Sampling device for measuring exhaust gas components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a component for measuring sampling apparatus for exhaust gas, the sample part of exhaust gases, particularly for measuring the concentration of such O _2, CO and SO ₂ in the high flue gas of the dust-containing concentration The present invention relates to a sampling device that can be suitably used when sampling as a gas.

[0002]

2. Description of the Related Art In recent years, for example, in a melting furnace or an incinerator, a component in an exhaust gas of a furnace is measured in order to increase a processing capacity of the furnace, and a result of the measurement is fed back to a combustion control to control the combustion under optimum conditions. Attempts have been made to do so.

Conventionally, O ₂ , C in exhaust gas having a high
The measurement of the concentration of O, SO _{2 and the} like is carried out by the measuring method (JIS
7951) is used. FIG. 5 shows an example of the configuration of a measuring device that performs this measuring method.

That is, in FIG. 5, a measuring device 100 includes a dust filter 102, a pump 103, a switching valve 104, a humidifier 105, a dehumidifier 106, a throttle valve 107, and a flow meter 108.
And a analyzer 110. First, a sample gas such as exhaust gas is supplied to the sampler 1
09 and the sample gas inlet 1
From 01, it is taken into the sampling section 109. After the sample gas is dust-removed by the dust filter 102, the humidifier 105 and the dehumidifier 106 further remove liquid and gaseous moisture and residual dust. The exhaust gas from which dust and liquid and gaseous moisture have been removed is supplied to the throttle valve 107 and the flow meter 10.
At 8, a predetermined amount is supplied to the analyzer 110. The analysis result is displayed on the instruction recorder 111. A calibration gas is supplied to the sample collection unit 109 as needed, and the sample gas is switched by the switching valve 104 to the sample gas, and calibration is appropriately performed.

[0005] In the present specification, "dust" refers to fine oxides, chlorides, sulfides, and the like generated in a furnace, and those gases, which are reduced in temperature in a flue and become gases. To fine solids, and fine particles mainly composed of solid carbon generated by combustion in a furnace.

[0006]

As a result of many research experiments by the present inventors, it has been found that the conventional measuring device 100 can be used at the outlet of a furnace, that is, before exhaust gas passes through a dust removal device or an exhaust gas treatment facility. When the exhaust gas is sampled as a sample gas and the concentration of O ₂ , CO, SO ₂ or the like in the exhaust gas having a high dust content is measured, the dust filter 102 is immediately clogged and the pressure loss is reduced. It was found to be large and hinder the measurement.

On the other hand, if the sample gas is collected from the exhaust gas after passing through a dust removing device or an exhaust gas treatment facility and the component concentration is measured, the dust filter 102 is not clogged and the measuring device 100 Can be suitably used. However, in this case, free air enters the exhaust gas in the dust removal device or the exhaust gas treatment facility,
O _{2 and the} like are water-soluble, and the components of the exhaust gas from the furnace cannot be measured accurately.

Therefore, instead of the dust filter 102,
It is conceivable to use a cyclone having a small pressure loss or an impinger having no pressure loss and a large dust-removing effect. However, these cyclones and the impinger have the following problems. (2) The initial cost is large. (3) Running costs such as power costs are large. (4) Maintenance costs are high. There is such a problem.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a sampling device for measuring components of exhaust gas, which has a small pressure loss, a high dust removal rate, and can easily discharge dust removed from a sample gas out of the system. It is.

Another object of the present invention is to provide a sampling device for measuring the components of exhaust gas, which can realize a reduction in the size of the device and can reduce initial costs, running costs, maintenance costs, and the like.

Another object of the present invention is to remove the residual dust slightly contained in the exhaust gas after dust removal to such an extent that the gas does not affect the measuring device before the gas reaches the measuring device. It is an object of the present invention to provide a sampling device for measuring the components of exhaust gas, which can greatly reduce the amount of exhaust gas.

Another object of the present invention is to measure the concentration of O ₂ , CO, SO _2, etc. in exhaust gas having a high dust content with high accuracy without damaging measuring equipment. It is an object of the present invention to provide a sampling device for measuring components of exhaust gas which can be used.

Still another object of the present invention is to collect a sample gas from an exhaust gas having a high dust content at an outlet of a furnace, measure the concentration of O ₂ , CO, SO _{2 and the} like in the exhaust gas, and measure the measurement result. The present invention provides a sampling device for measuring the components of exhaust gas, which can feed back to the combustion control to perform the combustion control under the optimum conditions of the furnace and increase the processing capacity.

[0014]

The above object is achieved by the sampling apparatus for measuring the components of exhaust gas according to the present invention.
In summary, the present invention removes dust in the exhaust gas with a dust remover, further cools the exhaust gas with a steam separator provided downstream of the dust remover, and removes liquefied water and residual dust. after at least O ₂ meter a predetermined amount of the exhaust gas as a sample gas, a sampling device for delivering any one of instrument CO meter and SO ₂ meter, the dust removing device, the exhaust gas A plurality of baffle plates, the outer periphery of which is partially cut away, are arranged at predetermined intervals in a housing constituting a flow path, and the housing is formed in a straight line.
A circular tube, wherein the baffle plate is smaller than the inner diameter of the tube.
A part of the outer periphery of a disk with a diameter is cut off,
The baffles are arranged alternately so that the cutouts are located above or below
A sampling device for measuring the component of exhaust gas , wherein the steam-water separator contains a saturated sodium chloride solution or a saturated sodium sulfate solution.

According to one embodiment of the present invention, the plurality of baffle plates are integrally held by a holding member that penetrates each baffle plate. Also, the pipe is arranged in a horizontal state and is connected to an exhaust gas source via an inclined exhaust gas collecting pipe.

According to another embodiment of the present invention, a cooler for removing gaseous moisture and a filter means for removing residual dust are provided downstream of the steam / water separator.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a sampling apparatus for measuring the components of exhaust gas according to the present invention will be described in more detail with reference to the drawings.

First, an embodiment of a dust removing device constituting a sampling device of the present invention will be described with reference to FIGS.

In this embodiment, the exhaust gas source is the exhaust gas flowing through the flue 2 and the sampling device 1 of the present invention converts the exhaust gas passing through the flue 2 at the outlet of the furnace, that is, the exhaust gas from the furnace. It shall be collected before passing through conventional dust removal equipment and exhaust gas treatment equipment. Exhaust gas passing through the flue 2 is partially collected as a sample gas into the sampling device 1 through a first exhaust pipe 3 connected to the flue 2 for collecting exhaust gas. The first sampling pipe 3 of the sampling device 1 is preferably at a predetermined angle α with respect to the horizontal, in this embodiment 45 °.
It is arranged at an inclination. That is, the first sampling pipe 3 is cooled by the outside air, and thus the exhaust gas introduced into the sampling pipe 3 is cooled by the first sampling pipe 3. Therefore, when the gas moisture in the exhaust gas is large and reaches saturation at the ambient temperature of the sampling device, the gas moisture in the exhaust gas condenses. As described above, when the first collection pipe 3 is inclined, the condensed moisture flows down the collection pipe 3 and the flue 2
It has the advantage of being returned inside.

The second end of the first collection tube 3, that is, the second
One end of the collection tube 4 is connected, and the other end of the second collection tube 4 is closed by a cleaning flange 5. This second sampling tube 4
One end of the third collection tube 6 is connected orthogonally to. The other end of the third collection tube 6 is connected to one end of a horizontal tube 7a of a fourth collection tube 7 which is a T-shaped tube. The other end of the horizontal pipe 7a is closed by a cleaning flange 8. The cleaning flanges 5 and 8 are used to clean the inside of the pipe by removing it from the pipe end at an appropriate time.

A dust removing device 10 is connected to the other end of the vertical tube 7b, one end of which is connected to the horizontal tube 7a of the T-shaped tube 7. In the present embodiment, the dust removing device 10 includes a tube 11 that is straight and horizontally arranged as a housing, and one end of the tube 11 is connected to the vertical tube 7b. Inside the pipe 11, a lamella plate device 12 is disposed as dust removing means as best shown in FIG. Tube 1 of lamellar plate device 12
The attachment / detachment to the inside of the tube 1 can be performed via a flange 61 detachably provided at the other end of the tube 11.

A lamellar plate device 1 constituting the dust removing means
2 shows one embodiment shown in FIG.
(15a to 15f) and a holding member 16 for holding these baffle plates 15 at a predetermined interval (P). Each baffle plate 15 has a shape in which a part of a disk having a diameter (D) slightly smaller than the inner diameter of the tube 11 is cut off at a position (H) which is １ ／ to の of the diameter, and a holding member 16 is provided. Are alternately mounted such that the cutouts are located above or below. In this embodiment, the inner diameter (D ₀ ) of the tube is 80 mm, and each baffle plate (disk) 15 is a stainless steel plate (SUS304) having a plate thickness (T) of 1 mm and a diameter (D) of 75 mm.
And a part thereof was cut off at a position (H) 20 mm from the outer periphery.

In the present embodiment, the holding member 16 is
Spacing (W) as shown in the figure with stainless steel rods with a diameter of 8 mm
These baffle plates 1 are bent in a U-shape at 40 mm and penetrate through the respective baffle plates 15 arranged at a predetermined interval (P).
5 was integrally held. In this embodiment, six baffle plates 15 are installed at intervals of P = 60 mm. The shape and the number of the baffle plates 15 are not limited to those in the above embodiment, and the diameter (D) is usually 30 to 100 mm and the number is 4 to 10 pieces. In addition, the U-shaped connecting portion 16a of the holding member 16 can be used as a handle, facilitating attachment and detachment in the pipe. Of course, the holding member 16 can have any shape as long as it can hold each baffle plate 15, and is not limited to the above-described embodiment.

As described above, according to the configuration of the dust removing device 10 disposed in the flow path of the exhaust gas, the exhaust gas introduced into the dust removing device 10 from one end of the pipe 11 flows to the other end of the pipe 11. While colliding with each baffle plate 15, it flows while changing its flow direction in the vertical direction so as to pass through the cutout portion of each baffle plate 15. In other words, according to the dust removing device 10 of the present invention, the exhaust gas introduced into the dust removing device 10 separates dust particles from the air current by repeating collision and direction change of the air flow many times, thereby, Is accumulated at the bottom of the tube 11.

The pressure loss when the dust removing device 10 according to the present invention having the above-described structure is used is negligible as compared with the case where a conventional dust removing filter is used. The amount of dust in the purified exhaust gas discharged from the dust removal device 10 is as follows:
The amount does not hinder the measuring device, and is a sufficiently acceptable amount, and can be significantly reduced as compared with the case where a conventional dust filter is used. Generally, when the dust removing device 10 of the present invention is used, the amount of dust in exhaust gas is 1
/ 100 or less.

When removing dust accumulated in the dust removing device 10, the flange 61 at the end of the tube is removed, and the handle 16a of the lamella plate device 12 is held, and a series of the baffle plates 1 are removed.
By drawing 5 out of the tube, the dust in the tube can be easily removed to the outside of the tube. When the dust removing device 10 of the present embodiment is used, the dust removing device 1 is provided once every three months.
It was sufficient to clean the inside of 0, and sufficient dust removal performance (dust removal rate) that did not hinder the measurement device could be exhibited.
In a sampling device using a conventional dust filter,
The filter was severely clogged, the pressure loss was large, and the dust filter had to be replaced several times a day or more, which hindered the measurement. Also in this respect, the present invention is remarkably superior to the conventional apparatus.

The dust removing apparatus 10 of the present invention having the above configuration.
May be provided in the exhaust gas flow path, if necessary, by connecting a plurality of them in series or arranging a plurality of them in parallel.

According to the present invention, a sample gas for measuring not only the concentration of O ₂ and CO in the exhaust gas but also the concentration of SO _{2 and the} like is collected by using the exhaust gas purified by the dust removing device 10. It has the characteristic that it can be used. That is, O
Unlike ₂ and CO gas, SO ₂ gas in order to be water-soluble, it is not possible to use the exhaust gas sampling means utilizing a water ejector pump.

According to the present invention, a flange 61 to which the connecting pipe 60 is connected is detachably attached to the end of the pipe 11 of the dust removing device 10 as understood with reference to FIG. The other end of the connection pipe 60 communicates with a steam separator 63 in which the cleaning liquid 62 is stored. As the cleaning liquid 62, a liquid having a small SO ₂ gas absorption loss is selected. For example, a saturated sodium chloride (NaCl) solution can be used, and a saturated sodium sulfate (Na ₂ S) solution is more preferable.
O ₄ ) solution.

The connecting pipe 60 is used to prevent dew condensation of gaseous water and to avoid dissolving SO ₂ in the condensed liquid water.
It is heated by a heater H provided around 0. Therefore, the exhaust gas which has been cleaned by the dust removing device 10 and passed through the connecting pipe 60 is cooled by the steam separator 63 to remove liquefied water and residual dust.

Furthermore, since the sample exhaust gas from the steam separator 63 preferably contains residual dust and vaporized water, a cooler 64 and a dust filter 65 are provided downstream of the steam separator 63. Connected in series. As the dust removal filter 65, a sintered metal, ceramic, or the like is used in addition to an element using fiber such as paper as an element.

The arrangement order of the cooler 64 and the dust filter 65 can be reversed. However, cooling and dew condensation of the gaseous moisture gives an error to the SO ₂ measurement. It is necessary to arrange the device 64 as close as possible to the steam separator 63 or to heat the pipe between the steam separator 63 and the cooler 64 to such an extent that condensation does not occur.

Exhaust gas as a sample gas from which liquid and gaseous moisture and dust have been removed is an O ₂ , CO, SO ₂ measuring device 5
The O ₂ , CO, and SO ₂ concentrations are measured by feeding them to 0, 51, and 52. Dust filter 65 as filter means
It is sufficient to exchange them once every two months.

Using the sampling apparatus of the present invention having the above structure, a sample gas is sampled from exhaust gas having a high dust content at the outlet of the melting furnace in smelting and smelting, and O ₂ , C
O and SO ₂ concentrations were measured, the measurement results were fed back to combustion control, and combustion control was performed under optimum furnace conditions. As a result, the processing capacity of the furnace could be improved by 25%.

[0035]

As described above, the sampling device for measuring the components of exhaust gas according to the present invention removes dust in the exhaust gas by the dust removing device, and further removes the dust by the steam separator provided downstream of the dust removing device. After cooling the exhaust gas to remove liquefied water and residual dust, a predetermined amount of the exhaust gas is sent as a sample gas to at least one of an O ₂ measuring instrument, a CO measuring instrument, and an SO ₂ measuring instrument. In the sampling device for, the dust removal device is configured by arranging at a predetermined interval a plurality of baffle plates whose outer periphery is partially cut off in a housing constituting a flow path of exhaust gas, and the housing is , Linear break
It is a tube with a circular surface, and the baffle is a disk with a smaller diameter than the inner diameter of the tube.
A part of the outer periphery is cut off, and each baffle
Are arranged alternately so that the cutouts are located above or below
Since the steam-water separator is configured to contain a saturated sodium chloride solution or a saturated sodium sulfate solution, (1) the pressure loss is small, a high dust removal rate is obtained, and the steam-water separator is removed from the sample gas. Dust can be easily discharged out of the system. (2) The size of the apparatus can be reduced, and the initial cost, running cost, maintenance cost, and the like can be reduced. (3) Residual dust contained in the exhaust gas after dust removal can be removed to a level that does not affect the measuring device before the gas reaches the measuring device, and the dust concentration in the exhaust gas can be significantly reduced. it can. (4) dust-containing O ₂ concentration high in the exhaust gas, CO, the concentration measurement, such as SO _2, without damaging the measuring instrument can be measured with high accuracy. (5) At the outlet of the furnace, sample gas is sampled from the exhaust gas with a high dust content, the concentration of O ₂ , CO, SO _2, etc. in the exhaust gas is measured, and the measurement result is fed back to the combustion control, and the Combustion control under optimal conditions can be performed to increase the processing capacity. The effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of an embodiment of a sampling device for measuring components of exhaust gas according to the present invention.

FIG. 2 is a front view of the sampling device for exhaust gas component measurement according to the present invention shown in FIG. 1;

FIG. 3 is a perspective view of one embodiment of a lamellar plate device provided in the dust removing device.

FIG. 4 is a schematic overall configuration diagram of an embodiment of a sampling device for measuring components of exhaust gas according to the present invention.

FIG. 5 is an overall configuration diagram for explaining a conventional method for measuring the component concentration of exhaust gas.

[Explanation of symbols]

Reference Signs List 1 sampling device 2 flue 3, 4, 6, 7 first, second, third, fourth
Extraction tube 5,8 closure flange 10 filtration apparatus 11 housing (tube) 12 dust dumping member (lamellar plate device) 50 O ₂ meter 51 CO meter 52 SO ₂ meter 60 connection pipe 61 flange 62 cleaning liquid 63 steam-water separator 64 Cooler 65 Dust removal filter (filter means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model Sho 62-126213 (JP, U) Japanese Utility Model Utility Model Hei 4-41709 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) G01N 1/22 JICST file (JOIS)

Claims (4)

(57) [Claims] 1. A method for removing dust in an exhaust gas by a dust remover, and further cooling the exhaust gas by a steam separator provided downstream of the dust remover to remove liquefied water and residual dust. Using a fixed amount of exhaust gas as a sample gas, at least an O ₂ measuring instrument, C
A sampling device for feeding to any one of an O measuring device and an SO ₂ measuring device, wherein the dust removing device cuts a part of an outer periphery into a housing constituting a flow path of exhaust gas. A plurality of baffle plates arranged at predetermined intervals, the housing is a straight pipe with a circular cross section,
The baffle plate is a part of the outer periphery of a disk having a diameter smaller than the inner diameter of the tube.
Has been cut off, and each baffle has a cutout
Are arranged alternately so as to be positioned below, and the steam-water separator contains a saturated sodium chloride solution or a saturated sodium sulfate solution. 2. The sampling device according to claim 1 , wherein the plurality of baffle plates are integrally held by a holding member that penetrates each of the baffle plates. Wherein the tube is disposed horizontally, inclined gas collection tube according to claim 1 or 2 components measurement sampling device of the exhaust gas, characterized in that it is connected to the exhaust gas source via. Downstream of claim 4, wherein the steam-water separator of claim 1, 2 or 3, characterized in that a filter means for removing condenser and residual dust for removing gaseous water
Sampling device for measuring exhaust gas components.