JP2010185619A - Device and method for treating exhaust gas - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust gas treatment device and a method for treating an exhaust gas, capable of stably treating an exhaust gas including an easy polymerizable substance for a long period, and easily controlling combustion reaction temperature. <P>SOLUTION: This exhaust gas treatment device 2 includes a fixed floor heat insulation type combustion reactor 10 to which a mixed gas including the exhaust gas and a susceptible gas is introduced without passing through a heat exchanger to burn the easy polymerizable substance, and part of the gas discharged from the fixed floor heat insulation type combustion reactor 10 is mixed with the exhaust gas, the susceptible gas or the mixed gas by an air blower 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an exhaust gas processing apparatus and an exhaust gas processing method for processing exhaust gas containing an easily polymerizable substance by burning it.

In general, an exhaust gas containing a combustible substance such as an organic substance is subjected to a process of burning the combustible substance for purification. As such an exhaust gas treatment method, for example, Patent Documents 1 and 2 disclose a method in which the exhaust gas is heated and the heated exhaust gas is brought into contact with a combustion catalyst to burn the exhaust gas. In this exhaust gas treatment method, in order to increase energy efficiency, heat is exchanged with the gas generated by the combustion process before the exhaust gas is burned, and the heat is heated.
However, when an easily polymerizable substance such as (meth) acrylic acid is contained in the exhaust gas, the easily polymerizable substance may be polymerized in the heat exchanger to block the heat exchanger. When the heat exchanger is blocked, the exhaust gas process must be stopped and cleaned, but if the exhaust gas process is stopped, the operation of the upstream process where the exhaust gas is generated is hindered. Therefore, the exhaust gas treatment is required to be stable over a long period of time.
Further, in the combustion of exhaust gas by a catalyst, it is required to maintain a high purification rate over a long period of time and to improve the economy by making the catalyst life as long as possible. The control of is important. However, the methods described in Patent Documents 1 and 2 have not been able to easily control the combustion reaction temperature. In particular, in the method described in Patent Document 2, the plate-type heat exchanger is used to stabilize the treatment, but the blockage cannot be eliminated even though there is an effect of extending the time until the blockage. .

JP-A-10-156142 JP 2001-133194 A

  The present invention has been made in view of the above circumstances, and is capable of processing an exhaust gas containing an easily polymerizable substance stably over a long period of time, and can easily control the combustion reaction temperature and an exhaust gas. An object is to provide a processing method.

  As a result of investigations by the present inventors, in controlling the combustion reaction temperature, it is important to independently control the temperature of the exhaust gas supplied to the combustion reactor and the temperature rise width in the combustion reactor. I found out. And as a result of examining the exhaust gas treatment method by combustion based on the knowledge, the following exhaust gas treatment device and exhaust gas treatment method were invented.

The present invention includes the following aspects.
[1] A fixed bed heat insulation type in which a combustion catalyst is charged and a mixed gas containing an easily polymerizable substance containing an exhaust gas and a combustion-supporting gas is introduced without passing through a heat exchanger to burn the easily polymerizable substance A combustion reactor;
A cooler for cooling at least a portion of the gas discharged from the fixed bed adiabatic combustion reactor;
A blower for blowing at least part of the gas discharged from the cooler;
To supply the gas blown by the blower to one or more of a pipe for transferring the exhaust gas, a pipe for transferring the combustion-supporting gas, and a pipe for transferring the mixed gas And an exhaust gas processing apparatus.
[2] At least a part of the gas that does not pass through the cooler out of the gas discharged from the fixed bed adiabatic combustion reactor is supplied to a pipe that transfers at least a part of the gas discharged from the cooler. The exhaust gas treatment device according to [1], further comprising a pipe for the purpose.
[3] A fixed bed heat insulation type that is filled with a combustion catalyst and in which an exhaust gas containing an easily polymerizable substance and a mixed gas containing an inflammable gas are introduced without passing through a heat exchanger to burn the easily polymerizable substance A combustion reactor;
A first blower for blowing part of the gas discharged from the fixed bed adiabatic combustion reactor;
A cooler that cools at least a portion of the remainder of the gas discharged from the fixed bed adiabatic combustion reactor;
A second blower for blowing at least part of the gas discharged from the cooler;
A pipe for transferring the exhaust gas, a pipe for transferring the combustion-supporting gas, and a gas mixture blown by the gas blown by the first blower and the gas blown by the second blower An exhaust gas processing apparatus comprising: a pipe for supplying to one or more of the pipes for performing the operation.
[4] The exhaust gas remained after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance and / or the gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance. The exhaust gas treatment apparatus according to any one of [1] to [3], wherein the exhaust gas treatment apparatus is a gas obtained by evaporating a liquid.
[5] A combustion process in which a gas mixture containing an easily polymerizable substance containing exhaust gas and a combustion-supporting gas is brought into contact with a combustion catalyst without passing through a heat exchanger to burn the easily polymerizable substance,
A cooling step for cooling at least a part of the gas generated in the combustion step;
A blowing step of blowing at least a part of the gas cooled in the cooling step;
And a mixing step of mixing one or more of the exhaust gas, the combustion-supporting gas, and the mixed gas with the gas blown in the blowing step.
[6] In the blowing step, at least a part of the gas generated in the combustion step that does not pass through the cooler is blown together with at least a part of the gas cooled in the cooling step. [5] The exhaust gas treatment method according to [5].
[7] In addition to the exhaust gas and the combustion-supporting gas, the temperature of the mixed gas supplied to the combustion process is further adjusted to 150 to 300 ° C., further including the gas blown in the blowing process [5] ] Or the exhaust gas treatment method according to [6].
[8] A combustion process in which a gas mixture containing an easily polymerizable substance containing exhaust gas and a combustion-supporting gas is brought into contact with a combustion catalyst without passing through a heat exchanger to burn the easily polymerizable substance,
A first blowing step of blowing a part of the gas generated in the combustion step;
A cooling step for cooling at least a part of the remainder of the gas generated in the combustion step;
A second blowing step for blowing at least a part of the gas cooled in the cooling step;
A mixing step of mixing the gas blown in the first blowing step and the gas blown in the second blowing step with one or more of the exhaust gas, the combustion-supporting gas, and the mixed gas. A featured exhaust gas treatment method.
[9] In addition to the exhaust gas and the combustion-supporting gas, the temperature of the mixed gas supplied to the combustion process further includes the gas blown in the first blowing process and the gas blown in the second blowing process It adjusts to 150-300 degreeC, The exhaust-gas processing method as described in [8] characterized by the above-mentioned.
[10] The exhaust gas remained after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance and / or the gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance. The exhaust gas treatment method according to any one of [5] to [9], which is a gas obtained by evaporating a liquid.
[11] The exhaust gas treatment method according to any one of [5] to [10], wherein the temperature of the gas discharged from the combustion process is 400 to 700 ° C.
[12] An easily polymerizable material comprising the exhaust gas treatment method according to any one of [5] to [11], wherein an easily polymerizable material is obtained by a gas phase catalytic oxidation reaction of a raw material for an easily polymerizable material. A method for producing a substance.

  The exhaust gas treatment apparatus and the exhaust gas treatment method of the present invention can treat exhaust gas containing an easily polymerizable substance stably over a long period of time, and can easily control the combustion reaction temperature.

1 is a schematic view showing a first embodiment of an exhaust gas treatment device of the present invention. It is a schematic diagram which shows the 2nd Example of the exhaust-gas processing apparatus of this invention.

<First Embodiment>
(Exhaust gas treatment equipment)
A first embodiment of the exhaust gas treatment apparatus of the present invention will be described.
FIG. 1 shows an exhaust gas treatment apparatus according to this embodiment. The exhaust gas treatment apparatus 2 of the present embodiment is an apparatus for combusting exhaust gas containing an easily polymerizable substance, and includes a combustion reactor 10, a blower 20, and a cooler 30, and the exhaust gas is combusted into a combustion reactor. 10 is not equipped with a heat exchanger for heating before being introduced into the apparatus.

Further, the exhaust gas treatment device 2 of the present embodiment example includes a first pipe 51 for supplying a mixed gas containing exhaust gas to the combustion reactor 10, and a gas discharged from the combustion reactor 10 as a cooler 30. A second pipe 52 for supplying the air to the blower, a fourth pipe 54 for supplying a part of the gas discharged from the cooler 30 to the blower 20, and the first pipe for the gas blown by the blower 20 A sixth pipe (return pipe) 56 for supplying to 51 and a seventh pipe 57 for connecting the fourth pipe 54 to the second pipe 52 are provided.
Further, an exhaust gas supply pipe 11 for supplying exhaust gas to the first pipe 51 is provided.

  Further, the exhaust gas treatment device 2 of the present embodiment includes a first gas temperature measuring device 61 attached to the first pipe 51, a gas flow rate adjusting valve 62 attached to the seventh pipe 57, A first control unit 63 that controls the opening of the gas flow rate adjustment valve 62 according to the gas temperature measured by the first gas temperature measuring device 61, and a second gas temperature measurement attached to the second pipe 52. And a second controller 65 that controls the amount of air blown from the blower 20 in accordance with the gas temperature measured by the second gas temperature measuring device 64.

  Further, the exhaust gas treatment device 2 of the present embodiment example includes a first heat exchanger 71 that heats the remaining portion of the cooling gas discharged from the cooler 30 by heat exchange with water, and a first heat exchanger 71. The gas cooled in step 1 is further cooled by heat exchange with the combustion-supporting gas, and the second heat exchanger 72 that heats the combustion-supporting gas, and the remainder of the cooling gas discharged from the cooler 30 is the first. An eighth pipe 73 for supplying the second heat exchanger 71, a ninth pipe 74 for supplying the gas discharged from the first heat exchanger 71 to the second heat exchanger 72, A discharge pipe 75 for discharging gas from the second heat exchanger 72, and a pipe for supplying combustion-supporting gas for supplying the combustion-supporting gas heated by the second heat exchanger 72 to the first pipe 51. 81, a water supply pipe 82 for supplying water to the first heat exchanger 71, and a first heat exchange 71. Heated water supply pipe 83 for supplying heated water obtained by heating water at 71 to the cooler 30, and steam pipe for transferring steam obtained by heating water at the cooler 30 84, a third gas temperature measuring device 85 attached to the fourth piping 54, a pressure measuring device 86 attached to the steam piping 84, and a downstream side of the pressure measuring device 86 of the steam piping 84. And a third control unit 88 for controlling the steam pressure adjusting valve 87 according to the gas temperature measured by the third gas temperature measuring device 85.

The combustion reactor 10 in the exhaust gas treatment device 2 is filled with a combustion catalyst and introduced with a mixed gas containing exhaust gas and combustion-supporting gas to burn easily polymerizable substances in the exhaust gas. The combustion reactor 10 is an adiabatic reactor that cannot be heated or removed from the outside, and a filled combustion catalyst forms a catalyst layer and is fixed.
In the present embodiment, a sixth pipe 56 to which the gas blown by the blower 20 is supplied is connected to the first pipe 51 for introducing the mixed gas into the combustion reactor 10. Accordingly, the mixed gas introduced into the combustion reactor 10 includes gas blown by the blower 20.

When the space velocity of the mixed gas in the combustion reactor 10 is large (for example, several thousand to several tens of thousands [1 / hour]), in order to reduce the pressure loss, the shape of the catalyst layer in the combustion reactor 10 is changed. In addition, it is preferable to have a flat shape having a large mixed gas passage area and a small thickness (passage distance).
Examples of the combustion catalyst filled in the combustion reactor 10 include a catalyst in which a metal such as platinum is supported on an inert metal oxide such as silica or alumina. The inert metal oxide may be formed into a honeycomb shape or a granular shape.

  The blower 20 blows the remaining hot gas discharged from the combustion reactor 10 and a part of the cooling gas discharged from the cooler 30 to the first pipe 51. Specifically, a blower is used as the blower 20.

  The cooler 30 cools the remaining hot gas discharged from the combustion reactor 10. In this embodiment, a once-through boiler is used as the cooler 30. In the cooler 30 that is a once-through boiler, the heated water supplied by the heated water supply pipe 83 is heated using the high-temperature gas discharged from the combustion reactor 10 as a heat medium. Thereby, the hot gas discharged | emitted from the combustion reactor 10 is cooled.

  In the exhaust gas treatment device 2 of the present embodiment, the cooling gas obtained by cooling a part of the gas discharged from the combustion reactor 10 by the cooler 30 and the remainder of the gas discharged from the combustion reactor 10 are the first. 1 is mixed with the exhaust gas in one pipe 51.

[Function and effect]
In the exhaust gas treatment device 2, the high-temperature gas discharged from the combustion reactor 10 is mixed with the exhaust gas without cooling, so the heat of the high-temperature gas discharged from the combustion reactor 10 is The exhaust gas can be heated without using a heat exchanger while being used. Therefore, the exhaust gas containing the easily polymerizable substance can be treated stably over a long period of time.
Moreover, since the cooling gas and the high temperature gas are mixed with the exhaust gas by the blower 20, the temperature of the mixed gas and the amount of the inert gas in the mixed gas can be easily adjusted. Therefore, the combustion reaction temperature in the combustion reactor 10 can be easily controlled.

(Exhaust gas treatment method)
An embodiment of an exhaust gas processing method using the exhaust gas processing apparatus 2 will be described.
The exhaust gas treatment method according to the present embodiment includes a combustion process, a cooling process, a blowing process, and a mixing process.

[Combustion process]
In the combustion process, the mixed gas is supplied to the combustion reactor 10 through the first pipe 51 without passing through the heat exchanger, and is brought into contact with the combustion catalyst in the combustion reactor 10 to combust the exhaust gas.
In this embodiment, the gas blown by the blower 20 is added to the mixed gas. Therefore, the mixed gas introduced into the combustion reactor 10 includes exhaust gas, combustion-supporting gas, and gas blown by the blower 20.

The exhaust gas is a gas containing a gas-like or mist-like easily polymerizable substance. Examples of the easily polymerizable substance include (meth) acrolein, (meth) acrylic acid, (meth) acrylic acid ester, and the like. Among exhaust gases, the effect of the present invention is particularly exerted from the gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance and / or from the mixture containing the easily polymerizable substance. A gas obtained by evaporating the liquid remaining after separating the easily polymerizable substance is preferred. The easily polymerizable substance is preferably obtained by a gas phase catalytic oxidation reaction of the raw material for the easily polymerizable substance.
As a gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance obtained by the gas phase catalytic oxidation reaction of the raw material for the easily polymerizable substance (or the gas obtained by evaporating the liquid), for example, propylene And (meth) acrolein, isobutylene, tert-butyl alcohol and methyl-tert-butyl ether are separated and recovered after gas phase catalytic oxidation of at least one of isobutylene, tert-butyl alcohol and methyl-tert-butyl ether Gas (or gas from which the liquid was evaporated), (meth) acrolein was vapor-phase contact oxidized, and (meth) acrylic acid and (meth) acrolein were separated and recovered, and the remaining gas (or gas from which the liquid was evaporated) ) And the like.
After vapor-phase catalytic oxidation of (meth) acrolein, (meth) acrylic acid is produced, and as by-products, carbon monoxide, carbon dioxide, low-boiling by-products, medium-boiling by-products (for example, Carboxylic acids such as formic acid, acetic acid and propionic acid, carbonyl compounds such as formaldehyde, acetaldehyde, propional aldehyde and acetone), high-boiling by-products (oligomers or polymers of (meth) acrolein, oligomers of (meth) acrylic acid or Polymer). Therefore, the exhaust gas from which (meth) acrylic acid has been removed from the gas produced by the gas phase catalytic oxidation reaction of (meth) acrolein is composed of carbon monoxide, low-boiling byproducts, and medium-boiling byproducts as flammable substances. Contains high-boiling by-products. It also contains (meth) acrylic acid remaining without being recovered.
In addition, although a high boiling point by-product is a liquid at normal temperature, the one part can be included in exhaust gas by heating at 100-250 degreeC.
Specifically, exhaust gas generated when synthesizing (meth) acrylic acid by gas phase catalytic oxidation reaction includes methacrolein, acrylic acid, methacrylic acid, isobutylene, oxygen, nitrogen, carbon monoxide, carbon dioxide, acetic acid. And water. Moreover, the waste liquid generated when synthesizing (meth) acrylic acid by the gas phase catalytic oxidation reaction includes methacrolein, acrylic acid, methacrylic acid, acetic acid, water, and the like.

  The combustion-supporting gas is a gas containing oxygen, and examples thereof include molecular oxygen, air, and oxygen-enriched air.

  The mixed gas is preferably heated to an appropriate temperature according to the concentration of the easily polymerizable substance in the mixed gas, the oxygen concentration, the concentration of other substances, and the like. Specifically, it is preferable to adjust the temperature of the mixed gas to 150 to 300 ° C. If the mixed gas is adjusted to 150 ° C. or higher, the easily polymerizable substance in the mixed gas can be easily burned in the combustion reactor 10, and if it is 300 ° C. or lower, it is caused by the combustion of the easily polymerizable substance. The temperature rise in the combustion reactor 10 can be suppressed, and thermal deterioration of the combustion catalyst can be prevented.

In this embodiment, in order to adjust the temperature of the mixed gas introduced into the combustion reactor 10 to an appropriate range, the temperature of the mixed gas in the first pipe 51 is measured by the first gas temperature measuring device 61. The first control unit 63 controls the opening of the gas flow rate adjustment valve 62 so that the temperature of the mixed gas becomes the target value.
Specifically, when the temperature of the mixed gas is higher than the target value, the opening degree of the gas flow rate adjusting valve 62 is decreased to reduce the amount of high-temperature gas mixed into the exhaust gas, thereby lowering the temperature of the mixed gas. On the other hand, when the temperature of the mixed gas is lower than the target value, the degree of opening of the gas flow rate adjustment valve 62 is increased to increase the amount of high-temperature gas mixed into the exhaust gas and raise the temperature of the mixed gas.

In the combustion process, the temperature of the gas rises as the easily polymerizable substance burns.
The temperature of the hot gas discharged from the combustion reactor 10 is preferably 400 to 700 ° C. If the temperature of the high-temperature gas discharged from the combustion reactor 10 is 400 ° C. or higher, the easily polymerizable substance is sufficiently combusted and the purification rate of the exhaust gas is increased. Can be prevented.

In this embodiment, the gas temperature in the second pipe 52 is measured by the second gas temperature measuring device 64 in order to adjust the temperature of the gas discharged from the combustion reactor 10 to an appropriate range. Then, the air volume of the blower 20 is controlled by the second control unit 65 so that the temperature of the gas in the second pipe 52 becomes the target value.
Specifically, when the temperature of the gas in the second pipe 52 is higher than the target value, the amount of air blown from the blower 20 is increased to increase the amount of gas mixed with the gas inactivated by combustion. The concentration of the easily polymerizable substance is lowered to suppress the combustion in the combustion reactor 10. When the temperature of the gas in the second pipe 52 is lower than the target value, the amount of air blown from the blower 20 is reduced to reduce the amount of gas deactivated by combustion into the mixed gas, and the easily polymerizable material Increasing the concentration activates combustion in the combustion reactor 10.

[Cooling process]
The cooling process is a process in which the remaining hot gas generated by the combustion process is supplied to the cooler 30 via the second pipe 52 and cooled.
In the present embodiment, as the cooler 30, a once-through boiler that heats water and generates steam is used. In the once-through boiler, in order to heat the water, the heat of the hot gas can be taken and cooled.
Specifically, the cooler 30 cools the high-temperature gas with the heated water that is the cooling medium supplied from the first heat exchanger 71 and further heats the heated water to obtain steam. The obtained steam is supplied to other equipment using steam via the steam pipe 84.

  In this embodiment, the temperature of the gas after the cooling process is adjusted. That is, the temperature in the fourth pipe 54 is measured by the third gas temperature measuring device 85, and the steam pressure is adjusted by adjusting the opening of the steam pressure adjusting valve 87 so that the temperature becomes the target value. The amount of heat that the heated water takes from the gas in the cooler 30 is adjusted. Specifically, when the temperature in the fourth pipe 54 is higher than the target value, the opening degree of the steam pressure adjustment valve 87 is increased. When the opening of the steam pressure adjusting valve 87 increases, the steam pressure decreases (that is, the amount of steam generated increases), so the amount of heat taken by the heated water from the gas increases, and the temperature of the gas after the cooling step increases. descend. When the temperature in the fourth pipe 54 is lower than the target value, the opening degree of the steam pressure adjusting valve 87 is reduced. When the opening of the steam pressure adjusting valve 87 is reduced, the steam pressure increases (that is, the amount of steam generated decreases), so the amount of heat taken from the gas by the heated water decreases, and the temperature of the gas after the cooling step is reduced. To rise.

[Blower process]
The blowing process is a process in which the blower 20 blows a part of the cooling gas cooled by the cooler 30 and the remaining hot gas discharged from the combustion reactor 10. The gas blown by the blower 20 is supplied to the first pipe 51 via the sixth pipe 56.

[Mixing process]
The mixing step is a step of mixing the gas blown by the blower 20 through the sixth pipe 56 with the exhaust gas in the first pipe 51.

[Other processes]
In the exhaust gas processing method using the exhaust gas processing device 2, the remaining portion of the cooling gas cooled by the cooler 30 is supplied to the first heat exchanger 71 via the eighth pipe 73. The first heat exchanger 71 exchanges heat between the remaining portion of the gas cooled by the cooler 30 and the water supplied to the first heat exchanger 71 via the water supply pipe 82, thereby cooling the cooler 30. While cooling the remainder of the gas cooled by (1), water is heated to obtain heated water. The heated water is supplied to the cooler 30 via the heated water supply pipe 83.

  Further, in the present embodiment, the gas discharged from the first heat exchanger 71 is supplied to the second heat exchanger 72 via the ninth pipe 74. The second heat exchanger 72 exchanges heat between the gas discharged from the first heat exchanger 71 and the combustion-supporting gas to cool the gas discharged from the first heat exchanger 71, and Heat the combustion-supporting gas. The gas cooled in the second heat exchanger 72 is discharged from the exhaust gas processing device 2 through the discharge pipe 75, and the heated combustion-supporting gas is supplied to the first through the combustion-supporting gas supply pipe 81. To the pipe 51.

[Function and effect]
In the above exhaust gas treatment method, the high-temperature gas after the combustion process is mixed with the exhaust gas without cooling, so the exhaust gas is heated without using a heat exchanger while utilizing the heat of the high-temperature gas after the combustion process. it can. Therefore, the exhaust gas containing the easily polymerizable substance can be treated stably over a long period of time.
Moreover, optimal heat exchange can be performed by the heat exchange system of the cooler 30, the first heat exchanger 71, and the second heat exchanger 72.

<Second Embodiment>
(Exhaust gas treatment equipment)
A second embodiment of the exhaust gas treatment apparatus of the present invention will be described.
FIG. 2 shows an exhaust gas processing apparatus of this embodiment. The exhaust gas treatment apparatus 1 of the present embodiment is an apparatus for combusting exhaust gas containing an easily polymerizable substance, and is a fixed bed adiabatic combustion reactor 10 (hereinafter abbreviated as a combustion reactor 10) and a first. The air blower 40, the cooler 30, and the second air blower 90 are provided, and the heat exchanger for heating the exhaust gas before being introduced into the combustion reactor 10 is not provided. Note that the combustion reactor 10 and the cooler 30 in the present embodiment are the same as the combustion reactor 10 and the cooler 30 in the first embodiment, and a description thereof will be omitted.

In addition, the exhaust gas treatment apparatus 1 of the present embodiment example includes a first pipe 51 for supplying a mixed gas containing exhaust gas to the combustion reactor 10, and a high-temperature gas discharged from the combustion reactor 10 (hereinafter, A second part of the pipe 52 for supplying a part of the hot gas to the cooler 30 and a part of the second pipe 52 for supplying the remainder of the hot gas from the second pipe 52 to the first blower 40. 3, a fourth pipe 54 for supplying a part of gas discharged from the cooler 30 (hereinafter also referred to as cooling gas) to the second blower 90, and the first blower A fifth pipe (return pipe) 55 for supplying the high temperature gas blown by 40 to the first pipe 51 and a cooling gas blown by the second blower 90 are supplied to the first pipe 51. And a sixth pipe (return pipe) 56.
Further, an exhaust gas supply pipe 11 for supplying exhaust gas to the first pipe 51 is provided.

  In addition, the exhaust gas treatment device 1 of the present embodiment is configured according to the first gas temperature measuring device 61 attached to the first pipe 51 and the gas temperature measured by the first gas temperature measuring device 61. Measured by the first controller 66 that controls the amount of air blown from the first blower 40, the second gas temperature measuring device 64 attached to the second pipe 52, and the second gas temperature measuring device 64. And a second control unit 65 that controls the amount of air blown from the second blower 90 in accordance with the gas temperature.

  Further, in the exhaust gas treatment device 1 of the present embodiment example, similarly to the exhaust gas treatment device 2 of the first embodiment example, the first heat exchanger 71, the second heat exchanger 72, 8 pipe 73, ninth pipe 74, discharge pipe 75, combustion-supporting gas supply pipe 81, water supply pipe 82, heating water supply pipe 83, steam pipe 84, 3 gas temperature measuring device 85, pressure measuring device 86, steam pressure adjusting valve 87, and third control unit 88.

The first blower 40 blows a part of the high-temperature gas discharged from the combustion reactor 10 to the first pipe 51.
The second blower 90 blows a part of the cooling gas discharged from the cooler 30 to the first pipe 51.
Specifically, as the first blower 40 and the second blower 90, a blower is used.

  In the exhaust gas treatment apparatus 1 of the present embodiment, a part of the high temperature gas discharged from the combustion reactor 10 is a second pipe 52, a third pipe 53, a first blower 40, and a fifth pipe 55. Is mixed with the mixed gas in the first pipe 51. A part of the cooling gas cooled by the cooler 30 is mixed with the mixed gas in the first pipe 51 through the fourth pipe 54, the second blower 90, and the sixth pipe 56. It is like that.

[Function and effect]
In the exhaust gas treatment device 1, the high temperature gas discharged from the combustion reactor 10 is mixed with the exhaust gas without cooling, so the heat of the high temperature gas discharged from the combustion reactor 10 is used. However, the exhaust gas can be heated without using a heat exchanger. Therefore, the exhaust gas containing the easily polymerizable substance can be treated stably over a long period of time.
The high temperature gas discharged from the combustion reactor 10 is mixed with the exhaust gas by the first blower 40, and the cooling gas discharged from the cooler 30 is converted into the exhaust gas by the second blower 90. It is supposed to be mixed. Thereby, the temperature of the exhaust gas supplied to the combustion reactor 10 and the temperature rise in the combustion reactor 10 can be controlled independently. Therefore, the combustion reaction temperature can be easily controlled.

(Exhaust gas treatment method)
An embodiment of an exhaust gas processing method using the exhaust gas processing apparatus 1 will be described.
The exhaust gas treatment method of the present embodiment includes a combustion process, a first blowing process, a cooling process, a second blowing process, and a mixing process.
Hereinafter, each step will be described.

[Combustion process]
The temperature of the exhaust gas, the combustion-supporting gas, the mixed gas, and the temperature of the hot gas discharged from the combustion reactor 10 in the combustion process of the present embodiment are the same as those of the first embodiment.
In this embodiment, the gas blown by the first blower 40 and the gas blown by the second blower 90 are added to the mixed gas. Therefore, the mixed gas introduced into the combustion reactor 10 includes exhaust gas, combustion-supporting gas, gas blown by the first blower 40, and gas blown by the second blower 90.

In this embodiment, in order to adjust the temperature of the mixed gas to the above range, the temperature of the mixed gas in the first pipe 51 is measured by the first gas temperature measuring device 61, and the temperature of the mixed gas is the target value. The first control unit 66 controls the amount of air blown by the first blower 40 so that
Specifically, when the temperature of the mixed gas is higher than the target value, the amount of air blown from the first blower 40 is reduced, and the amount of high-temperature gas mixed into the mixed gas is reduced to lower the temperature of the mixed gas. On the other hand, when the temperature of the mixed gas is lower than the target value, the amount of air blown from the first blower 40 is increased, and the amount of high-temperature gas mixed into the mixed gas is increased to raise the temperature of the mixed gas.
Further, the temperature of the mixed gas is also adjusted by controlling the gas temperature after the cooling step described later.

In this embodiment, in order to adjust the temperature of the hot gas discharged from the combustion reactor 10 to an appropriate range, the temperature of the gas in the second pipe 52 is measured by the second gas temperature measuring device 64. The amount of air blown by the second blower 90 is controlled by the second controller 65 so that the temperature of the gas in the second pipe 52 becomes the target value.
Specifically, when the temperature of the gas in the second pipe 52 is higher than the target value, the amount of air blown by the second blower 90 is increased and mixing of the gas inactivated by combustion into the mixed gas is performed. The amount is increased and the concentration of the easily polymerizable substance is decreased to suppress the combustion in the combustion reactor 10. When the temperature of the gas in the second pipe 52 is lower than the target value, the amount of air blown by the second blower 90 is reduced, and the amount of gas mixed into the gas mixture deactivated by combustion is reduced. Increasing the concentration of the polymerizable substance activates combustion in the combustion reactor 10.

[First blowing step]
The first blowing process is a process in which a part of the high-temperature gas discharged from the combustion reactor 10 is blown by the first blower 40. The hot gas blown by the first blower 40 is supplied to the first pipe 51 via the fifth pipe 55.

[Cooling process]
The cooling process is a process in which a part of the high-temperature gas generated by the combustion process is supplied to the cooler 30 via the second pipe 52 and cooled.
The method for cooling the high-temperature gas and the temperature adjustment of the gas after cooling in the present embodiment are the same as those in the first embodiment. However, the temperature in the fourth pipe 54 is preferably set to the temperature in the first pipe 51, that is, the inlet temperature of the combustion reactor 10.

[Second air blowing process]
The second blowing process is a process in which part of the cooling gas cooled by the cooler 30 is blown by the second blower 90. The cooling gas blown by the second blower 90 is supplied to the first pipe 51 via the sixth pipe 56.
Here, if the temperature of the cooling gas is set to the temperature in the first pipe 51, mutual interference between the first control unit 66 and the second control unit 65 does not occur, and the first pipe 51. Since the temperature inside is stable, it is preferable.

[Mixing process]
The mixing step is a step of mixing the high-temperature gas blown by the first blowing step and the cooling gas blown by the second blowing step with the exhaust gas in the first pipe 51.

[Other processes]
Other steps in this embodiment are also performed in the same manner as in the first embodiment.

[Function and effect]
In the above exhaust gas treatment method, the high-temperature gas after the combustion process is mixed with the exhaust gas without cooling, so the exhaust gas is heated without using a heat exchanger while utilizing the heat of the high-temperature gas after the combustion process. it can. Therefore, the exhaust gas containing the easily polymerizable substance can be treated stably over a long period of time.

(Other embodiment examples)
Note that the present invention is not limited to the above embodiment. For example, in the above embodiment, a once-through boiler is used as the cooler 30 in order to effectively use waste heat. However, a known cooler or heat exchanger may be used.
In the second embodiment, a part of the gas discharged from the combustion reactor 10 is cooled by the cooler 30 and supplied to the blower 20 without cooling the rest, but is discharged from the combustion reactor 10. The entire gas may be cooled by the cooler 30. In that case, the temperature of the gas mixed into the mixed gas may be adjusted by adjusting the degree of cooling in the cooler 30.
Further, in the above embodiment, the heat of the remaining part of the gas discharged from the cooler 30 is used, the water is heated by the first heat exchanger 71, and the combustion-supporting gas is discharged by the second heat exchanger 72. Although heated, these are not essential requirements of the invention.
In addition, the return pipe (the fifth pipe 55 and the sixth pipe 56) is connected to the exhaust gas supply pipe 11 or the combustion-supporting gas supply pipe 81 to connect the blower 20, the first blower 40, and the second blower. The gas blown by the blower 90 may be mixed with the exhaust gas or the combustion-supporting gas.
Further, only a part of the remaining portion of the gas blown by the blower may be mixed with the exhaust gas, the combustion-supporting gas, or the mixed gas.

The exhaust gas treatment method may be included in a method for producing an easily polymerizable material by a gas phase catalytic oxidation reaction of a material for the easily polymerizable material.
In addition, it is possible to build a more efficient system by taking in a fluid that requires heating in a process other than the exhaust gas treatment process of the present invention and utilizing a pinch technology technique.

1, 2 Exhaust gas treatment device 10 Combustion reactor 11 Exhaust gas supply pipe 20 Blower 30 Cooler 40 First blower 51 First pipe 52 Second pipe 53 Third pipe 54 Fourth pipe 55 Fifth Piping (return piping)
56 6th pipe (return pipe)
57 Seventh pipe 61 First gas temperature measuring device 62 Gas flow rate adjusting valve 63, 66 First control unit 64 Second gas temperature measuring device 65 Second control unit 71 First heat exchanger 72 Second Heat exchanger 73 Eighth pipe 74 Ninth pipe 75 Discharge pipe 81 Combustion gas supply pipe 82 Water supply pipe 83 Heated water supply pipe 84 Steam pipe 85 Third gas temperature measuring device 86 Pressure Measuring instrument 87 Steam pressure regulating valve 88 Third control unit 90 Second blower

Claims (12)

A fixed-bed adiabatic combustion reactor filled with a combustion catalyst, in which a mixed gas containing an exhaust gas containing an easily polymerizable substance and a combustion-supporting gas is introduced without passing through a heat exchanger, and the easily polymerizable substance is burned. When,
A cooler for cooling at least a portion of the gas discharged from the fixed bed adiabatic combustion reactor;
A blower for blowing at least part of the gas discharged from the cooler;
To supply the gas blown by the blower to one or more of a pipe for transferring the exhaust gas, a pipe for transferring the combustion-supporting gas, and a pipe for transferring the mixed gas And an exhaust gas processing apparatus.   A pipe for supplying at least a part of the gas not passing through the cooler out of the gas discharged from the fixed bed adiabatic combustion reactor to a pipe for transferring at least a part of the gas discharged from the cooler The exhaust gas processing apparatus according to claim 1, comprising: A fixed-bed adiabatic combustion reactor filled with a combustion catalyst, in which a mixed gas containing an exhaust gas containing an easily polymerizable substance and a combustion-supporting gas is introduced without passing through a heat exchanger, and the easily polymerizable substance is burned. When,
A first blower for blowing part of the gas discharged from the fixed bed adiabatic combustion reactor;
A cooler that cools at least a portion of the remainder of the gas discharged from the fixed bed adiabatic combustion reactor;
A second blower for blowing at least part of the gas discharged from the cooler;
A pipe for transferring the exhaust gas, a pipe for transferring the combustion-supporting gas, and a gas mixture blown by the gas blown by the first blower and the gas blown by the second blower An exhaust gas processing apparatus comprising: a pipe for supplying to one or more of the pipes for performing the operation.   The exhaust gas evaporates the gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance and / or the liquid remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance. The exhaust gas treatment apparatus according to any one of claims 1 to 3, wherein the exhaust gas treatment apparatus is a gas obtained by performing the process. A combustion process in which a gas mixture containing an easily polymerizable substance containing exhaust gas and a combustion-supporting gas is brought into contact with a combustion catalyst without passing through a heat exchanger to burn the easily polymerizable substance;
A cooling step for cooling at least a part of the gas generated in the combustion step;
A blowing step of blowing at least a part of the gas cooled in the cooling step;
And a mixing step of mixing one or more of the exhaust gas, the combustion-supporting gas, and the mixed gas with the gas blown in the blowing step.   6. The air blowing process according to claim 5, wherein at least a part of the gas that does not pass through the cooler out of the gas generated in the combustion process is blown together with at least a part of the gas cooled in the cooling process. The exhaust gas processing method as described.   The temperature of the mixed gas supplied to a combustion process is further adjusted to 150-300 degreeC, further including the gas ventilated at the ventilation process in addition to the said exhaust gas and the said combustion support gas. The exhaust gas treatment method according to 1. A combustion process in which a gas mixture containing an easily polymerizable substance containing exhaust gas and a combustion-supporting gas is brought into contact with a combustion catalyst without passing through a heat exchanger to burn the easily polymerizable substance;
A first blowing step of blowing a part of the gas generated in the combustion step;
A cooling step for cooling at least a part of the remainder of the gas generated in the combustion step;
A second blowing step for blowing at least a part of the gas cooled in the cooling step;
A mixing step of mixing the gas blown in the first blowing step and the gas blown in the second blowing step with one or more of the exhaust gas, the combustion-supporting gas, and the mixed gas. A featured exhaust gas treatment method.   In addition to the exhaust gas and the combustion-supporting gas, the temperature of the mixed gas supplied to the combustion process further including the gas blown in the first blowing process and the gas blown in the second blowing process is set to 150 to 300 The exhaust gas treatment method according to claim 8, wherein the exhaust gas treatment method is adjusted to ° C.   The exhaust gas evaporates the gas remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance and / or the liquid remaining after separating the easily polymerizable substance from the mixture containing the easily polymerizable substance. The exhaust gas treatment method according to any one of claims 5 to 9, wherein the exhaust gas treatment method is a gas obtained by performing the process.   The exhaust gas treatment method according to any one of claims 5 to 10, wherein the temperature of the gas discharged from the combustion process is 400 to 700 ° C.   A method for producing an easily polymerizable substance, comprising the exhaust gas treatment method according to claim 5, wherein the easily polymerizable substance is obtained by a gas phase catalytic oxidation reaction of a raw material for an easily polymerizable substance.

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