JPH0630259Y2 - Bag filter type dust collector - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention, when collecting dust-containing gas that generates acidic gas, performs dust removal treatment under optimum pulse jet air ejection conditions so as not to remove excess dust. The present invention relates to a bag filter type dust collector that can be used.

[0002]

2. Description of the Related Art For example, when a waste such as dust is incinerated, a large amount of acid gas is generated. Therefore, a bag filter having a surface coated with an alkaline powder is used to absorb the acid gas. Is being done.
In such a bag filter, if the dust collection process is continued for a certain period of time, the pressure loss of the filter cloth increases due to the accumulation of dust, so it is necessary to regularly perform a process of removing the dust accumulated by pulse jet air or the like. was there.

However, the coating layer of alkaline powder on the surface of the filter cloth is thin immediately after the dust is removed, and the acidic gas cannot be sufficiently absorbed and leaks to the exhaust side. There was a problem that it would end up. In addition, as a method of solving this, it was done to use a bag filter as a plurality of dust collection chambers, perform dust removal processing in each chamber, and immediately after that, coat alkaline powder, but the work was done. There is a problem in that the processing becomes extremely complicated and the processing efficiency is significantly reduced.

[0004]

The present invention solves the above-mentioned conventional problems and optimizes the ejection conditions of pulse jet air so that the acidic gas can be sufficiently absorbed even immediately after the dust is blown off. The present invention has been completed for the purpose of providing a bag filter type dust collecting apparatus capable of performing dust removal processing while controlling the above, and capable of efficiently performing filtration processing.

[0005]

The bag filter type dust collecting apparatus of the present invention, which has been made to solve the above-mentioned problems, removes dust from a filter cloth by pulse jet air ejected from a pulse jet air ejecting device. In a bag filter type dust collector that performs processing, a differential pressure gauge that measures the pressure loss of the filter cloth in the dust collection chamber and a concentration that measures the acid concentration of the purified treated gas discharged from the clean side of the dust collection chamber. And a controller for setting ejection conditions based on the measured values of the differential pressure gauge and the densitometer, and the controller is connected to the pulse jet air ejection device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the illustrated embodiments. In the figure, 1 is a dust collection chamber of a bag filter, 2 is a filter cloth arranged on the dirty side of the dust collection chamber 1, and 3 is a continuous treatment gas on the clean side of the dust collection chamber 1. It is an exhaust pipe for guiding to the fan 4.

The dust collection chamber 1 is provided with a differential pressure gauge 4 for measuring the pressure loss of the filter cloth 2 on the basis of the room pressure, and
The discharge pipe 3 is provided with a densitometer 5 for measuring the acid concentration of the purified treated gas filtered in the dust collecting chamber 1. On the other hand, on the upper part of the filter cloth 2, a manifold 6 for ejecting pulse jet air toward the opening of the filter cloth at the time of the blow-off process is arranged, and the pulse jet air ejecting device 7 including the manifold 6 is provided. The differential pressure gauge 4
A control device 8 for setting ejection conditions of pulsed jet air based on the measurement value from the densitometer 5 is connected.

In the embodiment, the pulse jet air jetting device 7 is a pressure tank 9 for supplying compressed air to the manifold 6, and an automatic pressure regulating valve 10 for adjusting the air pressure in the pressure tank 9. And the manifold 6
A solenoid valve 11 for controlling the pressure value, pulse time, etc. of pulse jet air ejected from the automatic jet pressure control valve 10 and the solenoid valve 11 according to a signal command from the control device 8. When operated, the controlled pulse jet air is ejected from the manifold 6.

[0009]

In the apparatus constructed as described above, the dust-containing gas containing a large amount of acidic gas is introduced into the dust collecting chamber 1 and filtered by the filter cloth 2 having the surface coated with alkaline powder. After that, it is similar to the conventional one in that it passes through the discharge pipe line 3 and is discharged to the outside from the fan 4 as clean air. Moreover, when the dust collecting process is continued for a certain time, dust is accumulated. The point that dust removal processing is performed by the pulse jet air ejected from the manifold 6 so as to eliminate the pressure loss of the filter cloth 2 due to the above is also the same as in the conventional case.

However, in the present invention, the above-mentioned jet of pulse jet air is discharged from the differential pressure gauge 4 for measuring the pressure loss of the filter cloth 2 in the dust collecting chamber 1 and the clean side of the dust collecting chamber 1 and the discharge pipe. It is performed under the condition set to the optimum value based on the measured value with the densitometer 5 that measures the acidic concentration of the purified treated gas passing through the path 3. That is, when the measured values of the differential pressure gauge 4 and the densitometer 5 are input to the control device 8, the optimum ejection conditions of the next pulse jet air are calculated corresponding to these values, and the signals of the calculated values are controlled. It is input to the jetting device 7 for pulse jet air connected to the device 8, and, for example, the air pressure jetted from the pressure tank 9 after controlling the pressure value of the automatic pressure regulating valve 10 and the opening time of the pulse solenoid valve 11 and the like. The air volume is determined.
Therefore, the dust accumulated on the surface of the filter cloth 2 can be reliably removed from the manifold 6, and the excessive removal such as the coated alkaline powder is not removed. The controlled pulse jet air will be ejected.

As described above, the pulse jet air for performing the dust removal process checks the concentration of the acid gas in the discharge pipe line 3 and feeds back the measured value to the control device 8 in the subsequent filtering process. It is controlled so that the acidic gas is ejected under the optimum conditions capable of sufficiently absorbing the acidic gas, so that the dust removing process and the filtering process are always performed most efficiently. It is needless to say that the configuration of the jetting device 7 for the pulse jet air, the installation place of the densitometer 5 and the like can be appropriately changed to those other than the embodiment.

[0012]

As is apparent from the above description, in the present invention, the dust jetting condition of the pulse jet air is controlled to the optimum value so that the acidic gas can be sufficiently absorbed even immediately after the dust is blown off. It is possible to remove the dust and remove it, and it is possible to efficiently perform the filtration treatment. Furthermore, it is possible to easily modify the conventional bag filter type dust collector without making a large design change. There is also an advantage. Therefore, the present invention has an extremely great practical value as a bag filter type dust collecting apparatus which eliminates the conventional problems.

[0013]

[Brief description of drawings]

FIG. 1 is a flowchart showing an outline of an embodiment of the present invention.

[Explanation of symbols]

 1 Dust collection chamber 2 Filter cloth 4 Differential pressure meter 5 Density meter 7 Pulse jet air jetting device 8 Control device

Claims (1)

[Scope of utility model registration request] 1. A bag filter type dust collector for removing dust from a filter cloth (2) by pulse jet air jetted from a pulse jet air jet device (7), in a dust collection chamber (1). A differential pressure gauge (4) that measures the pressure loss of the filter cloth (2) and a densitometer (5) that measures the acid concentration of the purified treated gas discharged from the clean side of the dust collection chamber (1). Provided with a control device (8) for setting ejection conditions based on the measured values of the differential pressure gauge (4) and the densitometer (5), and the control device (8) is provided with the pulse jet air ejection device (7). Bag filter type dust collector characterized by being connected to.