JPS6110746Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to treatment equipment for removing acidic components from exhaust gas using lime powder.

The exhaust gas emitted from incinerators, etc. contains organic waste (such as vinyl chloride resin) and heavy oil.
Contains large amounts of acidic components such as HCl and SOx,
These must be removed to prevent air pollution.

Methods for removing these acidic components include a wet method in which lime powder such as quicklime, slaked lime, calcium carbonate, etc. is mixed into a solution and the exhaust gas is brought into contact with milk of lime, and a dry method in which the lime powder, etc. is blown directly into the exhaust gas. be.

By the way, when designing an incinerator, it is common to install multiple incinerators in parallel, taking into consideration the fact that the amount of dust increases over the years and the need for regular and irregular repairs to the incinerators. . Therefore, all the furnace bodies were not always in full operation, and each furnace body had its own unique characteristics, so it was necessary to provide auxiliary equipment that operated with independent functions for each furnace body. Regarding processing of components, processing equipment was provided for each exhaust gas flow path connected to each furnace body. This not only increases equipment costs, but also
Maintenance and management of each treatment facility is required, and the operation and management of these devices as a whole is extremely complicated. Furthermore, in treatment equipment that uses both the wet method and dry method mentioned above, the amount of lime required differs depending on the characteristics of each method, so complex management of the amount of lime supplied is required. establishment was required.

The present invention provides an exhaust gas treatment facility that meets the above-mentioned requirements. In the treatment equipment, an acid component concentration detector installed in each exhaust gas exhaust system, one lime powder storage tank,
It consists of a table feeder placed at the bottom of the lime powder storage tank and provided with a plurality of discharge ports, and a lime powder discharge amount adjustment valve attached to each discharge port of the table feeder. The gist is that the opening degree of the discharge amount regulating valve is adjusted to individually adjust the amount of lime supplied to each exhaust gas generation/exhaust system.

The configuration and effects of the present invention will be explained below based on the drawings showing the embodiments. Any changes to the design of the above are within the technical scope of the present invention.

FIG. 1 is a schematic explanatory diagram illustrating the exhaust gas treatment equipment of the present invention, in which two incinerators 1a and 1b are installed together.
The exhaust gas discharged from the exhaust gas ducts 5a and 5b
Gas cold rooms 2a, 2b, dust collector 4 installed in the middle of
After passing through a and 4b, it joins a flue 6 and is discharged from a chimney 7 into the atmosphere. By the way, when removing acidic components by the dry method, the exhaust gas duct 5
When removing acidic components by a wet method by blowing lime powder through a nozzle provided facing the containers 8a and 5b, the lime powder is supplied to the water in the lime dissolving tanks 8a and 8b to produce lime milk. Thereafter, the exhaust gas is blown through nozzles provided facing the gas cold chambers 2a and 2b using a transfer means such as a pump, and the acidic components are removed at the same time as the exhaust gas is cooled. Further, removal of acidic components may be performed in a wet treatment chamber provided separately from the gas cooling chamber. and lime powder mixed into the exhaust gas (including reactants and unreactants with acidic components)
is a dust collector (cyclone, bag filter, etc.) 4
The exhaust gases removed and purified by a and 4b are discharged from a flue 6 through a chimney 7. It should be noted that whether to employ the dry method or the wet method is appropriately selected in consideration of the type and concentration of acidic components in the exhaust gas, the convenience of wastewater treatment, etc., and both methods may be used in combination. Here, the lime powder is supplied from the lime silo 3 via the rotary table feeder 9 together with a carrier gas (usually air), and the amount of feed is determined by the acidic component concentration detector 10a installed in the ducts 5a and 5b.
It is adjusted according to the concentration of acidic components in the exhaust gas detected by the table feeder 10b.
(Figure).

FIG. 2 is a partially cutaway side view illustrating the lime powder discharge device applied to the exhaust gas treatment equipment of the present invention, and FIG. 3 is a sectional view taken along the line -- in FIG. 2. In these figures, the table feeder 9 is provided with a distributor 14 which is rotated by the drive of a motor 13 along the inner wall surface of the outer cylinder 9a, and which guides and introduces the carrier gas that is pressurized from the forced air blowers 16, 16. air duct 18a,
18b, 18c, 19a, 19b, 19c and air ducts 17a (not shown), 17b, 17c, 20a (not shown), 20b, 20c for guiding and discharging the lime powder in the distributor 14 together with the carrier gas are installed outside. They are connected at appropriate positions on the upper and lower surfaces of the tube 9a at approximately equal intervals. In addition, the air ducts 20a, . . . and 1 directly below the table feeder 9
Release amount adjustment valves 21 for adjusting the amount of lime powder released are provided at the connection boundaries of 7a, . is carried out according to instructions from the control device. And distribution viewer 14
Box 1 temporarily stores a certain amount of lime.
A plurality of aprons 4a are arranged in series along the inner circumferential edge of the outer cylinder, and an apron 15 is formed in the center thereof to slope toward each box 14a, so that lime powder falling from the silo 3 flows into each box 14a. The structure is such that equal amounts of water flow into each of them. Moreover, the upper and lower surfaces of each box 14a are formed in an open state, allowing lime powder to be introduced and discharged freely. However, although a bottom plate is provided on the lower surface of the outer cylinder 9a to prevent the lime powder introduced into the box 14a from falling naturally, the bottom plate is opened at the positions of the air ducts 17a, 20a, etc., which send out the lime powder with a carrier gas. ing. Therefore, the lime powder introduced into the box 14a along the apron 15 is temporarily stored in the box 14a, but the air ducts 17a..., 2 are driven by the motor 13.
Since the carrier gas from each blower 16 is blown into the box 14a that has reached the top of 0a..., the lime powder is sequentially discharged on this airflow, as shown in FIG. 4, for example.

By the way, the optimum amount of lime powder differs depending on whether it is fed to a dry processing section or a wet processing section.
It also varies depending on the concentration of acidic components in the exhaust gas.
Therefore, the opening ratio (operating ratio) of the discharge amount adjustment valve is determined in advance and stored in the control device so that the optimum discharge amount can be obtained according to each supply point. Air ducts 17b and 20b to chambers 2a and 2b are connected to lime dissolution tanks 8a and 8.
To b, air ducts 17c and 20c are connected to exhaust gas ducts 5a and 5b, respectively, and detected by acidic component concentration detectors 10a and 10b. Based on the measurement result of the acidic component concentration in the exhaust gas, the opening degree of the release amount adjustment valve is commanded, and the valve is operated based on the command. Further, the other regulating valves provided in the same exhaust gas system are respectively opened in accordance with the above-mentioned opening degree ratio, and in this way, the required amount of lime powder is supplied to each part. The lime powder supplied to the lime dissolution tanks 8a, 8b is turned into slurry milk of lime and is sent to the gas cold chambers 2a, 2b. In this way, the opening/closing and opening degree control of each discharge amount regulating valve is automatically controlled by the control device which issues an operation command based on the detection signals from the acidic component concentration detectors 10a, 10b. In the embodiment, the carrier gas is always fed to the table feeder 9 side, but for example, between the air ducts 18a... and the air ducts 17a,..., and between the air ducts 19a,...
... and the air duct 20a.... If a bypass circuit is provided between the air duct 20a and the carrier gas so that the carrier gas can bypass the table feeder 9 by switching the opening and closing of a solenoid valve, the blower 16 does not have to be turned on and off each time. Mosumu.

FIG. 4 is a cross-sectional developed view explaining the driving state of the table feeder 9, in which boxes 14a, 14a...
are formed adjacent to each other while being separated from each other. When the carrier gas is pressurized in accordance with the command from the control device and the discharge amount adjustment valves 21 are opened based on the respective predetermined ratios, the lime powder pushed by the carrier gas is pushed out according to the opening degree, and the air duct 17a, 17b, 17c, 20a, 20b, 20
It is sent to each supply point via c. When the optimal amount of lime powder is pumped in this way, the distributor 14 is rotated by the drive of the motor 13, and the next box 14a is transferred to each air duct 18a, . . . , 19.
Move to position a,... When the next box 14a reaches a predetermined position, the distributor 14 stops rotating and waits at that position until the next time the carrier gas is injected. On the other hand, the preceding box 14a to which the lime powder was fed is connected to the air duct 18a, . . .
19a, . . . , new lime powder waiting on the apron 15 flows in. The discharge amount adjusting valve is preferably a damper whose opening degree can be adjusted by driving a servo motor, but its mechanism is not particularly limited. Furthermore, it is preferable to separately adjust the time interval of lime supply, that is, the rotation speed of the table feeder, based on the sum of the output signals of the acidic component concentration detectors 10a and 10b, or the output signal indicating a higher concentration. For this purpose, it is desirable that the motor 13 be an electromagnetically controlled motor.

In this way, with the present invention, the acidic components discharged from two or more exhaust gas generation equipment can be removed with one lime powder supply equipment, making it extremely easy to clean the exhaust gas and reducing the equipment cost. There are also few.

[Brief explanation of the drawing]

Fig. 1 is a flow sheet explaining the exhaust gas treatment equipment of the present invention, Fig. 2 is a partially cutaway side view, Fig. 3 is a sectional view taken along the - line in Fig. 2, and Fig. 4 is a developed explanatory diagram of the table feeder. It is. 1a, 1b... Incinerator, 2a, 2b... Gas cold room, 3... Silo, 4a, 4b... Dust collector, 5
a, 5b...Exhaust gas duct, 9...Table feeder.

Claims (1)

[Scope of utility model registration request] This is an exhaust gas treatment facility that uses lime to remove acidic components in the exhaust gas generated from two or more exhaust gas generation facilities installed together, and the treatment facility includes an acidic component concentration detector installed in each exhaust gas exhaust system, and an acidic component concentration detector installed in each exhaust gas exhaust system. ,
It consists of one lime powder storage tank, a table feeder arranged at the bottom of the storage tank and provided with a plurality of discharge ports, and a discharge amount adjustment valve attached to each discharge port of the table feeder, and the detection 1. Exhaust gas treatment equipment characterized in that the amount of lime supplied to each exhaust gas generation/exhaust system is adjusted individually based on the measured values of the equipment.