JPH11309338A - Removal of hydrogen chloride from hydrogen chloride-containing gas and production of granular dehydrochlorination reactant used therein - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the consumption quantity of a dehydrochlorination reactant to reduce dehydrochlorination treatment cost in dry hydrogen chloride-containing gas such as pyrolysis gas or combustion exhaust gas of waste using a granular dehydrochlorination reactant. SOLUTION: In a method for removing hydrogen chloride from hydrogen chloride-containing gas constituted so that the hydrogen chloride-containing gas is passed through a reaction bed packed with a granular dehydrochlorination reactant and the dehydrochlorination reactant and hydrogen chloride are subjected to contact reaction to form a chloride compd. while the reacted dehydrochlorination reactant is discharged to the outside from the reaction bed, a coating layer of a dehydrochlorination reactant 8d having a desired thickness is formed on the outer surface of the used dehydrochlorination reactant 8a taken out of the reaction bed and this regenerated dehydrochlorination reactant 8e having this coating layer is supplied into the reaction bed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing hydrogen chloride from a hydrogen chloride-containing gas such as a pyrolysis gas of waste and a combustion exhaust gas of waste by using a granular dehydrochlorinating reagent. The present invention relates to a method for producing a granular dehydrochlorination reagent used for wastewater treatment, and is mainly used in a waste treatment plant such as municipal solid waste.

[0002]

2. Description of the Related Art Dust, hydrogen chloride, sulfur oxides and the like are included in pyrolysis gas generated by dry distillation pyrolysis of waste, combustion exhaust gas obtained by burning the pyrolysis gas, and pyrolysis residue and combustion exhaust gas of waste. And many harmful substances such as nitrogen oxides. Among them, hydrogen chloride causes so-called high-temperature corrosion of metals, so that it is difficult to effectively utilize pyrolysis gas or high-temperature combustion exhaust gas in a dry distillation pyrolysis apparatus of waste or an incineration apparatus of waste, This causes problems such as the necessity of using a large amount of fossil fuel as a heat source for pyrolysis and the inability to achieve high temperature and high pressure of steam in the waste heat recovery boiler.

[0003] For this reason, many techniques have been developed so far for removing hydrogen chloride from the pyrolysis gas and combustion exhaust gas. In particular, a dry hydrogen chloride removal method using a granular dehydrochlorination reactant is economical. Because of its excellent operability and operability, it is suitable for use in waste distillation pyrolysis melting combustion equipment and waste incineration equipment.

FIG. 6 shows an example of the use of a dry hydrogen chloride removing apparatus 20 in a waste pyrolysis pyrolysis apparatus for waste, in which a part of a pyrolysis gas 23 generated in a pyrolysis drum 21 is converted into a chloride. It is sent to the hydrogen removing device 20, where the hydrogen chloride HCl contained in the pyrolysis gas 23 is removed by reacting it with a granular dehydrochlorination reactant, and the clean pyrolysis gas 23 from which the hydrogen chloride has been removed is pyrolyzed. The gas is sent to a gas combustion device 24 where it is burned, and the combustion heat is used to obtain a heating gas 27 for heating and carbonizing the waste 25 in the pyrolysis drum 21.

[0005] In the pyrolysis gas combustion device 24, the heating gas 27 does not contain hydrogen chloride in order to burn the clean pyrolysis gas 23 from which hydrogen chloride has been removed. As a result, high-temperature corrosion does not occur in the pyrolysis gas combustion device 24 and the pyrolysis drum 21, and the waste 25
It is possible to reduce energy costs required for dry distillation pyrolysis of coal.

The dry hydrogen chloride removing device 20 includes a dehydrochlorinating reactor 20a, a supply device 20c for supplying a granular dehydrochlorinating agent 20b to the dehydrochlorinating reactor 20a, and a dehydrochlorinating reactor 20a. The dehydrochlorination reactor 20a is formed of a discharge device 20d for taking out the used dehydrochlorination reaction agent 20b, and inside the dehydrochlorination reactor 20a, granular quick lime, granulated slaked lime, granulated sodium carbonate, granulated calcium carbonate And the like, or a mixture of two or more of these, is filled with a dehydrochlorination reagent 20b, thereby forming a reaction layer composed of a packed layer of the dehydrochlorination reagent 20b.

That is, granular quicklime, granulated slaked lime, etc., which becomes the dehydrochlorination reactant 20b, have a particle diameter of 2 to 10 m.
m, and these are filled into the reactor 20a in a movable or fixed state to form a reaction layer. The hydrogen chloride HCl in the pyrolysis gas 23 forms a reaction layer with the dehydrochlorination reagent 20b.
(Eg, granulated slaked lime), the following contact reaction occurs, and the hydrogen chloride in the pyrolysis gas 23 is fixed to the dehydrochlorination reactant 20b in the form of calcium chloride,
It will be removed from the pyrolysis gas 23. Ca (O
H) ₂ + 2HCl = CaCl ₂ + 2H ₂ O

[0008] Calcium chloride and unreacted granulated slaked lime produced in the dehydrochlorination reactor 20a by the reaction between hydrogen chloride and granulated slaked lime are carried out of the dehydrochlorination reactor 20a to the outside by the discharging device 20d. And discharge conduit 20
e to the crusher 28. Thereafter, it is further pulverized here and transferred to the slaked lime hopper 29. Further, the fine particles stored in the slaked lime hopper 29 are blown into the exhaust gas treatment device 30, and are reused as an agent for removing hydrogen chloride in the combustion exhaust gas. Further, the dehydrochlorination reactor 2
0a is supplied from the supply device 20c to the dehydrochlorination reactant 20.
Granulated slaked lime as b is supplied regularly and intermittently, and calcium chloride and unreacted granulated slaked lime corresponding to the supplied amount are discharged from the dehydrochlorination reactor 20a.

In FIG. 6, slaked lime (Ca (OH) ₂ ) is used as a dehydrochlorination reactant. Instead of this, quicklime (CaO) and calcium carbonate (CaCO ₃ ) are used as described above. ) And sodium carbonate (Na ₂ CO ₃ ) may be used as the dehydrochlorination reactant 20b. In FIG. 6, reference numeral 22 denotes a waste supply device, 26 denotes a waste pit, 31 denotes a carry-out device, and 32 denotes a waste pit.
Is a fusion combustion device, 33 is a separation device, 34 is a waste heat boiler,
35 is a dust collector, 36 is an induction ventilator, 37 is a chimney, and 38 is an air heater.

[0010]

The dry hydrogen chloride removing method using the granular dehydrochlorinating agent 20b shown in FIG. 6 can remove hydrogen chloride in the gas to be treated relatively efficiently. In addition, the operation of the device does not take much trouble,
It has excellent practical utility. However, there are still many problems to be solved in the dry hydrogen chloride removal method. Among them, the problem is that the utilization rate of the dehydrochlorination reagent 20b is low. That is, although granular quicklime or granulated slaked lime having a particle size of 2 to 10 mm is used as the dehydrochlorination reactant 20b, the reaction with hydrogen chloride in the gas to be treated is not performed on the whole granular material, Most of the reaction will take place in the surface layer at a depth of about 0.5 mm from the outer surface of the granular material.

As a result, a large amount of the unreacted dehydrochlorinating agent remains inside the granular material. For example, when the particle diameter of the dehydrochlorinating agent 20b is 5 mm, the internal diameter is 4 m
The volume of the unreacted portion of m will occupy about 50% of the total volume, and about 50% of the total volume will be wasted. In the actual dehydrochlorination treatment, the amount of the dehydrochlorination reactant 20b supplied into the gas to be treated is:
The theoretical amount required to remove hydrogen chloride in the pyrolysis gas has reached about 4 to 10 times the theoretical amount, and the consumption of the dehydrochlorination reagent 20b has increased, reducing the running cost of the hydrogen chloride removal device. Has become difficult.

According to the present invention, the above-mentioned problem in the process of removing hydrogen chloride from a hydrogen chloride-containing gas using a conventional granular dehydrochlorinating agent, that is, the consumption of the dehydrochlorinating agent increases. In order to solve the problem of not being able to reduce the cost of removing hydrogen chloride, the removal rate of hydrogen chloride can be reduced by increasing the utilization rate of the granular dehydrochlorination reagent and reducing its total consumption. An object of the present invention is to provide a method for removing hydrogen chloride from a hydrogen chloride-containing gas, which enables a significant reduction in cost, and a method for producing a particulate dehydrochlorinating reactant used for the method.

[0013]

According to the first aspect of the present invention, a hydrogen chloride-containing gas is passed through a reaction bed filled with a granular dehydrochlorinating reactant, and the dehydrochlorinating reactant and the hydrogen chloride are separated. In a method of removing hydrogen chloride from a hydrogen chloride-containing gas, in which a reacted particulate dehydrochloride reactant is discharged from the reaction layer to the outside while a contact reaction is performed to generate a chloride compound, the reactant is removed from the reaction layer. A coating layer of a desired thickness of the dehydrochlorinating agent is formed on the outer surface of the used dehydrochlorinating agent, and the regenerated dehydrochlorinating agent having the coating layer formed is supplied into the reaction layer. This is the basic configuration of the invention.

According to a second aspect of the present invention, a hydrogen chloride-containing gas is passed through a reaction layer filled with a granular dehydrochloride reactant, and the dehydrochloride reactant and the hydrogen chloride are contacted and reacted to form a chloride compound. In the method for removing hydrogen chloride from a hydrogen chloride-containing gas, wherein the reacted particulate dehydrochlorinated reactant is discharged from the reaction layer to the outside, the particulate dehydrochlorinated reactant is made of an inorganic material. A dehydrochlorinating agent is formed by forming a coating layer of a dehydrochlorinating agent on the outer surface of a nuclear granule made of the above, and the outer surface layer of the used dehydrochlorinating agent removed from the reaction layer is peeled off. Along with the removal, a coating layer of the desired thickness of the dehydrochlorinating agent was formed on the outer surface of the core granules of the used dehydrochlorinating agent from which the outer surface layer was peeled off, and the coating layer was formed. Regenerative dehydrochlorination It is an basic configuration of the invention to provide a 応剤 into the reaction layer.

According to a third aspect of the present invention, a hydrogen chloride-containing gas is passed through a reaction layer filled with a granular dehydrochloride reactant, and the dehydrochloride reactant and the hydrogen chloride are contacted and reacted to form a chloride compound. In the method for removing hydrogen chloride-containing gas from the reaction layer, the reacted particulate dehydrochlorination reagent is discharged from the reaction layer to the outside, and the used dechlorination used from the reaction layer is removed. The outer surface layer of the hydrogen reactant is peeled and removed, and the used dehydrochlorinated reactant whose outer surface layer is peeled and removed is crushed to form a powder, and the granular regenerated dechlorination formed using the powder as a raw material The basic configuration of the present invention is to supply a hydrogen reactant into the reaction layer.

According to a fourth aspect of the present invention, a hydrogen chloride-containing gas is passed through a reaction bed filled with a granular dehydrochloride reactant, and the dehydrochloride reactant and the hydrogen chloride are contacted and reacted to form a chloride compound. After the reaction, the reacted particulate dehydrochlorinating reactant is discharged from the reaction layer to the outside, and the outer surface portion of the used dehydrochlorinating reagent discharged from the reaction layer is peeled off and removed. The basic configuration of the present invention is to crush the used dehydrochlorinating reactant from which the surface layer has been peeled and removed to form a powder, and supply the powder to a low-temperature combustion exhaust gas treatment device after waste heat recovery. Things.

According to a fifth aspect of the present invention, there is provided a tumbling granulator wherein a nucleating granule made of an inorganic material serving as a nucleus of a granulated material is stirred, and a powder of a dehydrochlorinating agent is added to the nucleating granule. The basic constitution of the present invention is to form a coating layer of a desired thickness of a dehydrochlorinating reactant on the outer surface of the nucleating granules by adding a body and a binder little by little.

The invention according to claim 6 is the invention according to claim 1, claim 2,
In the invention of claim 3 or claim 4, the dehydrochlorination reagent is one or a mixture of quick lime, slaked lime, sodium carbonate and calcium carbonate.

According to a seventh aspect of the present invention, in the second aspect, the core powder is limestone, ceramic or incinerated ash slag.

The invention of claim 8 is the invention of claim 5, wherein the dehydrochlorinating agent is one or a mixture of quick lime, slaked lime, sodium carbonate and calcium carbonate, and the nuclear granules are used. It is made of limestone, ceramic or incinerated ash slag, and the binder is water.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram showing an embodiment of the invention according to claim 1, wherein the dry distillation pyrolysis gas of waste such as municipal waste, the removal of hydrogen chloride in the combustion exhaust gas of pyrolysis gas and waste, etc. This shows a case where the present invention is applied. In FIG. 1, 1 is a supply device for a dehydrochlorination reagent, 2 is a dehydrochlorination reactor, 3 is a discharge device for a used dehydrochlorination reagent, and the supply device 1 and the dehydrochlorination reaction are performed. The vessel 2 and the discharge device 3 form a dry-type hydrogen chloride removing device A used in the present invention. FIG.
4 is an apparatus for separating used dehydrochlorination reagents,
5 is a dehydrochlorinating agent coating device, 6 is a drying device,
7 is a conveyance path of the regenerated dehydrochlorinating reactant, 8 is a dehydrochlorinating reactant for initial filling, 8a is a used dehydrochlorinating reactant, and 8i is a reacted fractionated product of the dehydrochlorinating reactant (large). 8j is the reacted fraction of the dehydrochlorinating reagent (reused small diameter), 8d is the powder of the dehydrochlorinating reagent, and 8e is the regenerated dehydrochlorinating reagent. And B are gases to be treated (gases containing hydrogen chloride) such as pyrolysis gas and combustion exhaust gas.

The supply device 1 supplies granular dehydrochlorination reactants 8 and 8e into the dehydrochlorination reactor 2, and includes a hopper, a granular material feeding device (not shown), and the like. The supply device 1 has a particle size of 2 to 10
mm granular quicklime, granulated slaked lime, granulated sodium carbonate,
A predetermined amount of a dehydrochlorinating reactant 8 comprising one or a mixture of two or more kinds of granulated calcium carbonate or the like is provided as an initial charge and a replenisher.

In the dehydrochlorination reactor 2, a reaction layer (not shown) comprising a packed layer of the granular dehydrochlorination agent 8.
Is formed, and when the gas B to be treated containing hydrogen chloride flows in the reaction layer, a contact reaction between the hydrogen chloride and the dehydrochlorinating agent 8 occurs as described above, and the calcium chloride, sodium chloride, etc. Is formed in the dehydrochlorination reagent 8, thereby removing the hydrogen chloride in the gas B to be treated.

The discharging device 3 discharges the used dehydrochlorinating reagent 8a from the dehydrochlorinating reactor 2, and discharges the dehydrochlorinating reactant 8a intermittently at regular time intervals. Then, a predetermined amount of the used dehydrochlorinating agent 8a is discharged. When the dehydrochlorinating agent 8a is discharged, a new dehydrochlorinating agent 8 or a regenerated dehydrochlorinating agent 8e corresponding to the discharged amount is supplied into the dehydrochlorinating reactor 2 to replenish the reaction layer. Done.

The separating apparatus 4 separates and removes the dehydrochlorinated reactant 8a discharged by the discharging apparatus 3 from the used dehydrochlorinated reactant 8a whose diameter has been repeatedly increased by coating, and also has a small diameter 8j. Is to be separated for repeated coating.

The coating apparatus 5 forms the coating layer by fixing the powder 8d of the dehydrochlorinating reactant on the outer surface of the core with the small-diameter dehydrochlorinating agent particle size separation product 8j from the separating apparatus 4 as a core. In the present embodiment, as will be described later, while agitating a small-diameter dechlorinated water raw material 8j serving as a core by a tumbling granulator, slaked lime powder is added thereto. By adding a small amount of water serving as a binder to form a coating layer of slaked lime having a thickness of about 0.5 mm to 1.0 mm on the outer surface of the particle size separated product 8j of the small-diameter dechlorinated water material. I have.

In the coating apparatus 5, the regenerated dehydrochlorinated reactant 8e having a new coating layer of the dehydrochlorinated reactant 8d formed on the outer surface thereof is continuously supplied to the drying apparatus 6
, Whereby the coating layer is more firmly fixed to the granular core 8c.

The regenerated dehydrochlorinated reactant 8e discharged from the drying device 6 is returned to the supply device 1 through the transport path 7, is stored in the hopper, and is converted into a new granular dehydrochlorinated reactant 8. Instead, it is supplied into the dehydrochlorination reactor 2. That is, in the embodiment of FIG. 1, the repeated coating eliminates the necessity of using slaked lime as a core portion, and as a result, the substantial consumption of the dehydrochlorination reactant is greatly reduced.

FIG. 2 is a system diagram showing an embodiment of the invention described in claim 2. In the present invention, limestone, ceramic, incinerated ash slag, etc. having an appropriate particle size (for example, 2 to 9 mm) are used. The particles of the inorganic substance are referred to as core particles 8f, and a regenerating dehydrochlorinating agent 8e formed by forming a coating layer of a dehydrochlorinating agent 8d on the outer surface of the core particles 8f in a coating apparatus 5 is used. , To the supply device 1.

The outer surface layer of the used dehydrochlorinating agent 8a discharged from the dehydrochlorinating reactor 2 is peeled off and dropped in the separation device 4, and the reacted portion 8 of the dehydrochlorinating agent is removed.
The core particles 8f forming the inner layer portion of the dehydrochlorinating reactant after the removal of b are supplied to the coating apparatus 5 and are circulated and used as in the case of FIG. In the invention of claim 2 as well, the substantial usage of the dehydrochlorinating reactant required for the dehydrochlorination removal treatment of the gas B to be treated is significantly reduced, and the processing cost can be greatly reduced. Become.

FIG. 3 is a system diagram showing an embodiment of the third aspect of the present invention. In the present invention, the separated outer surface layer is separated and removed downstream of the separation device 4 after separation. A crushing device 9 for crushing the unreacted portion 8c of the hydrogen chloride reactant, and 8 g of powder of the dehydrochlorinated reactant formed by the crushing device 9 are used as raw materials, and this is granulated together with a binder 8h into particles having a particle size of 2 to 10 mm. A granulating device 10 to be formed is provided.
Regenerated dehydrochlorination reagent 8 having a particle size of 2 to 10 mm formed by
e is circulated and supplied to the dehydrochlorination reactor 2.

The regenerated dehydrochlorinating reactant 8e formed in the granulating device 10 is returned to the supply device 1 through the conveying path 7 as described above. At this point, a new dehydrochlorinating reactant 8 is supplied in an amount corresponding to the reacted portion 8b which has been stripped and removed. In addition, although the performance of the dehydrochlorination treatment is slightly reduced, the used dehydrochlorination reactant 8 c
May be supplied to the crushing device 9 as it is, and the powder from the crushing device 9 may be supplied to the granulating device 10.

According to the third aspect of the present invention, it has been confirmed by actual machine tests that the same dehydrochlorinating performance can be obtained as when the new granular dehydrochlorinating agent 8 is used. That is, when the concentration of hydrogen chloride is 0.4 to 0.8.
% Of the gas B to be treated by the method of the present invention, the concentration of hydrogen chloride can be reduced to 200 ppm or less. According to the third aspect of the present invention, when the particle diameter of the dehydrochlorinating agent is 5 mm, the amount of the reacting agent used is smaller than when the conventional dehydrochlorinating apparatus is used as described above. Can be reduced by about 50%.

FIG. 4 is a system diagram showing an embodiment of the invention according to claim 4, wherein the unreacted portion 8c of the used dehydrochlorinating reactant 8a discharged from the dehydrochlorination treatment apparatus A is
It is obtained by a structure for reusing the dehydrochlorination process of low-temperature combustion exhaust gas B ₁ for discharging to the outside after heat recovery. That is,
In the present invention, a crushing device 9 is provided downstream of the separation device 4, and the outer surface layer of the used dehydrochlorination reactant 8a is separated and removed in the separation device 4, and then the dehydrochlorination reaction agent is removed. The unreacted portion 8c is crushed by the crushing device 9 and 8 g of the formed powder of the dehydrochlorination reactant is subjected to the waste heat recovery to obtain the low-temperature combustion exhaust gas B.
_{1 into} the exhaust gas treatment device 12 for dehydrochlorination treatment,
It is intended to be reused for the removal of hydrogen chloride low temperature combustion exhaust gas B _1. In the present invention, the dehydrochlorination treatment apparatus A
Can be effectively reused unreacted portion 8c of the dehydrochlorination reaction agent discharged from, it is possible to reduce the dehydrochlorination reaction agent that is required for processing the low temperature flue gas B _1.

FIG. 5 is a system diagram showing an embodiment of the fifth aspect of the present invention, and shows a method for producing a regenerated dehydrochlorination reagent 8e used in the present invention. In FIG. 5, reference numeral 13 denotes a rolling granulator, and a known rotary drum granulator, rotary dish granulator, stirring granulator, spherical granulator, or the like is used as the rolling granulator 13. Can be used. FIG.
In FIG. 8, reference numeral 8c denotes an unreacted portion (granular material) 8 of the granular dehydrochlorination reactant obtained by peeling off the reacted portion 8b of the surface layer portion.
c and 8f are powders of limestone, ceramic, incinerated ash slag, etc. (granules for nuclei) serving as nuclei of granules, and 8d is a powder of a dehydrochlorinating agent composed of quicklime, slaked lime, sodium carbonate, calcium carbonate, etc. The body, 8h, is a binder such as resin or water.

In producing the dehydrochlorinating agent 8e, first, the unreacted portion (granules) 8c or the nucleating granules 8f of the dehydrochlorinating reactant is put into the tumbling granulator 13, and these are placed in a predetermined position. The powder 8d of the dehydrochlorination reactant and the binder 8h are added to the resultant while being rolled at the above speed, and a coating layer of the powder 8d is sequentially formed on the outer surface of the nucleus granules 8f and the like.

[0037]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary dish-type tumbling granulator 13 is used, and a dehydrochlorinating reactant (used to have a particle diameter of 2 to 2) made of used slaked lime.
5 mm) 8a, and the rolling granulator 13 is rotated at about 300 rpm.
m of the used slaked lime, and a dehydrated slaked lime powder 8d of 30 wt% of the used slaked lime reactant 8a and the dehydrated slaked lime formed of the used slaked lime. A binder (water) 8h of 30 wt% of the reactant 8a was added little by little over about 5 minutes. As a result, a coating layer of slaked lime having a substantially uniform thickness of about 1 mm was formed on the dehydrochlorinating reactant 8a comprising the used slaked lime.

[0038]

According to the first aspect of the present invention, since the coating layer is formed on the outer surface of the used dehydrochlorinating agent, the consumption of the dehydrochlorinating agent is greatly reduced. I do.

In the second aspect of the present invention, a coating layer of a dehydrochlorinating agent is formed on the outer surface of the core particles 8f. In addition, the consumption of the dehydrochlorination reagent can be reduced.

According to the third aspect of the present invention, it is possible to greatly reduce the consumption of the dehydrochlorination reactant as in the case of the first aspect of the present invention.

[0041] In the invention of claim 4, it is possible to effectively utilize the unreacted portion 8c of the dehydrochlorination reaction agent which is discharged from the dehydrochlorination removing device A hydrogen chloride removal process of the low-temperature flue gas B _1, waste It is possible to reduce the consumption of the dehydrochlorination reactant in the entire material processing plant.

According to the fifth aspect of the present invention, water is used as the binder 8h to provide a special binder 8h.
Without using h, the regenerated dehydrochlorination reactant 8e can be produced at extremely low cost. The present invention has excellent practical utility as described above.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of a method for removing hydrogen chloride from a hydrogen chloride-containing gas according to the present invention.

FIG. 2 is a system diagram showing a second embodiment of the method for removing hydrogen chloride.

FIG. 3 is a system diagram showing a third embodiment of the hydrogen chloride removing method.

FIG. 4 is a system diagram showing a method for removing hydrogen chloride from low-temperature combustion exhaust gas after waste heat recovery according to the present invention.

FIG. 5 is an explanatory diagram of a method for producing a granular regenerated dehydrochlorination reagent used in the present invention.

FIG. 6 is an explanatory diagram showing an example of a process for removing hydrogen chloride from pyrolysis gas in a waste carbonization pyrolysis melting and burning plant.

[Explanation of symbols]

A: hydrogen chloride removal device, B: gas to be treated, B ₁ : combustion exhaust gas, 1 ... dehydrochlorination reactant supply device, 2 ... dehydrochlorination reactor, 3 ... dehydrochlorination reaction agent discharge device, 4 ... use Separation device for used dehydrochlorination reagent, 5 ... coating device,
6 ... Drying device, 7 ... Conveying path of dehydrochlorinating reagent, 8 ... Dehydrochlorinating reactant before use, 8a ... Used dehydrochlorinating reactant, 8b ... Reacted part of dehydrochlorinating reactant ( Outer surface layer), 8c: unreacted portion of dehydrochlorinating reactant (inner layer), 8d: powder of dehydrochlorinating reactant, 8e: regenerated dehydrochlorinating reactant, 8f: granules for nucleus, 8g ... Unreacted portion powder, 8h: Binder (water), 8i: Separated particle size of dehydrochlorinating agent (discarded: large diameter), 8j: Separated particle size of dehydrochlorinating agent (reused) Use: small diameter), 9 ...
Crushing device, 10: Granulation device, 12: Exhaust gas treatment device, 1
3. Rolling granulator.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Sueshin Kawabe 1-2-1, Shinhama, Arai-cho, Takasago-shi, Hyogo Pref.

Claims (8)

[Claims] 1. A hydrogen chloride-containing gas is passed through a reaction bed filled with a granular dehydrochloride reactant to cause a contact reaction between the dehydrochloride reactant and hydrogen chloride to produce a chloride compound. In the method for removing hydrogen chloride from a hydrogen chloride-containing gas in which a reacted particulate dehydrochlorinated reactant is discharged from the reaction layer to the outside, the outside of the used dehydrochlorinated reactant taken out of the reaction layer is removed. Forming a coating layer of a new dehydrochlorinating agent with a desired thickness on the surface, and supplying the regenerated dehydrochlorinating agent having formed the coating layer into the reaction layer; Hydrogen chloride removal method. 2. A hydrogen chloride-containing gas is passed through a reaction bed filled with a granular dehydrochloride reactant, and the dehydrochloride reactant and the hydrogen chloride are contact-reacted to form a chloride compound. A method for removing hydrogen chloride from a hydrogen chloride-containing gas, wherein the reacted granular dehydrochlorinated reactant is discharged from the reaction layer to the outside, wherein the granular dehydrochlorinated reactant is made of a core particle made of an inorganic material. A dehydrochlorinating agent is formed by forming a coating layer of the dehydrochlorinating agent on the outer surface of the body, and the outer surface layer of the used dehydrochlorinating agent removed from the reaction layer is removed and removed. A coating layer of a desired thickness of the dehydrochlorinating agent is formed on the outer surface of the core particles of the used dehydrochlorinating agent from which the surface layer has been peeled off, and the regenerated dehydrochlorinating reaction is performed by forming the coating layer. Add the agent to the reaction layer A method for removing hydrogen chloride from a hydrogen chloride-containing gas, characterized in that the gas is supplied to the inside. 3. A hydrogen chloride-containing gas is passed through a reaction layer filled with a granular dehydrochloride reactant, and the dehydrochloride reactant and the hydrogen chloride are contact-reacted to form a chloride compound. In the method for removing hydrogen chloride from a hydrogen chloride-containing gas in which a reacted particulate dehydrochlorinated reactant is discharged from the reaction layer to the outside, the outside of the used dehydrochlorinated reactant taken out of the reaction layer is removed. The surface layer is peeled and removed, and the used dehydrochlorinated reactant from which the outer surface layer has been peeled off is crushed into powder, and the granular regenerated dehydrochlorinated reactant formed using the powder as a raw material is mixed with the reaction layer. A method for removing hydrogen chloride from a hydrogen chloride-containing gas, characterized in that the gas is supplied to the inside. 4. After a hydrogen chloride-containing gas is passed through a reaction layer filled with a granular dehydrochloride reactant, the dehydrochloride reactant and the hydrogen chloride are contact-reacted to form a chloride compound. Discharging the reacted granular dehydrochlorination reagent from the reaction layer to the outside, and peeling off the outer surface layer of the used dehydrochlorination reagent discharged from the reaction layer,
Hydrogen chloride characterized by crushing a used dehydrochlorinating reagent from which the outer surface layer has been peeled off to form a powder, and supplying the powder to a processing device for low-temperature combustion exhaust gas after waste heat recovery. Method for removing hydrogen chloride from contained gas. 5. A nucleating granule made of an inorganic material serving as a nucleus of a granulated material is stirred in a tumbling granulator, and a powder of a dehydrochlorination reactant and a binder are added to the nucleating granule. A method for producing a granular dehydrochlorinating reactant, characterized in that a coating layer of a desired thickness of the dehydrochlorinating reactant is formed on the outer surface of the nuclei granules by adding a small amount at a time. 6. The method according to claim 1, wherein the dehydrochlorination reactant is one or a mixture of quick lime, slaked lime, sodium carbonate, and calcium carbonate. For removing hydrogen chloride from gas containing hydrogen chloride. 7. The method for removing hydrogen chloride from a hydrogen chloride-containing gas according to claim 2, wherein the core particles are particles of limestone, ceramic or incinerated ash slag. 8. The dehydrochlorination agent is one or a mixture of quick lime, slaked lime, sodium carbonate and calcium carbonate, and the core granules are granules of limestone, ceramic or incinerated ash slag. The method for producing a granular dehydrochlorination reactant according to claim 5, wherein the binder is water.