JPS59189953A - Method for preventing clogging of cyclone - Google Patents

Abstract

PURPOSE:To make it possible to simply and certainly eliminate the clogging of a cyclone without lowering the operation rate of an apparatus, by discovering the clogging of the cyclone in an early stage without stopping the operation of a combustion apparatus while performing the removal of a clogging substance within a short time. CONSTITUTION:In a method for preventing the clogging of cyclones 2, 5 each for separating the dust contained in the exhaust gas generated in a combustion tower, the clogging of the under-flow side of the cyclone is detected by a clogging detecting mechanism consisting of temp. detectors 50-55 and a control apparatus 56. On the other hand, pressure blocking mechanisms 4, 7 comprising dampers 20-23 are provided to the under-flow side of the cyclone and opened by the clogging signal of the aforementioned clogging detecting mechanism while exhaust gas is flowed to the under-flow side to remove a clogging substance. By this method, the generation of clogging is discovered within an insignificant state without stopping the operation of the apparatus and the elimination of clogging can be further performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention applies to a fluidized bed combustion tower in a pyrolysis apparatus, etc.
The present invention relates to a method for preventing dust clogging of a cyclone for removing dust from combustion exhaust gas.

In this type of cyclone, dust (solid particles such as ash and abrasion sand) is present in a part of the under 70-side of the cyclone.
However, conventionally, the occurrence of a blockage was detected when the dust was no longer ejected. Therefore, when a blockage is detected, the degree of blockage is considered to be large, and in order to release the blockage, the operation of the device must be stopped and the blockage must be stopped for 1 minute. 1' to remove the obstruction and then reassembly.

Therefore, the processing capacity decreases due to a decrease in the operating rate of the equipment.
In addition, there was a drawback that it required a great deal of effort and cost.

The present invention eliminates the above-mentioned drawbacks of the conventional methods, and provides a method for preventing blockages in cyclones, which allows the occurrence of blockages to be detected before they are slight and the blockages to be cleared without stopping the operation of the equipment. The purpose is to provide the following.

The present invention provides a method for preventing blockage of a cyclone that separates dust contained in exhaust gas generated in a combustion tower, in which a blockage signal from a blockage detection mechanism that detects blockage on the underflow side of the cyclone is detected. This is a method for preventing blockage of a cyclone, which is characterized by removing the blockage by flowing the exhaust gas to the underflow side outside of the pressure cutoff mechanism.

Embodiments of the present invention will be described using the drawings.

In Fig. 1, reference numeral 1 denotes a fluidized bed type combustion tower, and the generated exhaust gas is subjected to cyclones 2 and 5 to remove dust, and an exhaust gas boiler 8 and heat exchangers 9 and 10 to lower the temperature of the exhaust gas. After fine dust is removed at the rock bottom 14, it is released into the atmosphere from the exhaust port 15. On the other hand, cyclone 2
, 5 is stored in the dust hoppers 3, 6 of the cyclones 2, 5 for a short time [1 old 6), and then stored in the ash bunker 11 by the dust extraction device 7.4 having a pressure cut-off mechanism, where it is ashed as appropriate. The extraction device 13 carries out the pyrolyzer outside the pyrolysis system. The bypass valve 12 is a bypass 16 that connects the ash bunker 11 and the electrostatic precipitator 14.
and is normally closed.

Figure 2 shows the 3Y narrow near cyclones 2,51;j.

The dust extraction devices 4, 7 are equipped with dampers 20, 2 +, 22.23 as a double damper type pressure cutoff mechanism, and the upper and lower dampers are opened and closed in turn, and the positive pressure exhaust gas in the cyclone 2.5 is removed from the under 70 -. It is designed to prevent dust from blowing to the side and to exhaust the dust. 50.5 +
, 52, 53, 54, and 55 are temperature detectors, and 56 is a control device.

If a blockage occurs in the under 70 side of the cyclone 2 or 5, that is, in the pipes or equipment below from the dust hopper 3 or 6, the temperature inside the cyclone 2.5 or the dust hopper 3.6 will rise, so the temperature within the cyclone 2.5 or the dust hopper 3.6 will rise. When the distance exceeds 1, it is determined that a blockage has occurred, and the control device 56 issues a blockage signal. That is,
The temperature detectors 50, 51, 52, 53, 54, 55 and the control device 56 form a blockage detection mechanism, allowing early detection of blockages.

Blockage detection (Dampers 20, 2+, 22° 23, and bar
The I-pass valve 12 is opened, and the high-pressure exhaust gas in the cyclones 2 and 5 blows through, flows through the under 70- side, enters the ash bunker 11, and then passes through the bypass valve 12 and the electrostatic precipitator 14.
After that, it is grabbed from chimney 15. Ash extraction device 1
Close the damper in 3 to prevent exhaust gas from leaking.

At this time, the accumulated dust is blown away by the exhaust gas flowing through the pipes and equipment on the under 70 side, and the blockage is eliminated.

After a predetermined period of time, or when the flow condition of exhaust gas becomes normal and the blockage has been eliminated, the internal pressure of Ashba Shika 11 or the bypass valve +2 (= I) When the bypass valve 1 is detected and judged based on the differential pressure with the internal pressure of .5 or the exhaust gas flow rate J1, etc.
2 is closed to shut off the pressure (returning several operations to normal conditions).

The occlusion detection mechanism may be configured as follows. 111 for a predetermined time at an appropriate time while the device is operating. Open the pressure cut-off mechanism. At this time, the flow state of the gripping gas flowing to the underflow side is detected directly or indirectly. Check the normal exhaust gas flow rate on the under 70- side when there is no blockage, and compare this normal flow rate with the detected flow rate to determine the state of blockage, and if it exceeds the allowable limit, it is determined that there is a blockage and the flow is continued for a predetermined period of time. Continue to open the pressure cutoff mechanism and release the gas under 70-
Run it to the side to exclude dust accumulation and eliminate blockages.

Whether the exhaust gas flow is normal can be detected directly by a flow meter or indirectly by the pressure of each part or the differential pressure between those pressures and the pressure inside the cyclones 2 and 5. It can also be detected by changes in the pressure at the top of the combustion tower 1.

In addition, if the flow of exhaust gas is used to release the blockage, applying vibration with a hammer or pie break is effective in breaking up accumulated dust and peeling off adhered dust.

The above is a fluidized bed 1! using a single blower (pushing blower 17). ! This is an example in which the exhaust gas pressure in cyclones 2 and 5 is less than atmospheric pressure, or the electrostatic precipitator (14 and chimney 15) It is also possible to carry out the present invention by additionally installing an induced blower (not shown) in the opening of the cyclones 2 and 5. 'desirable.

According to the present invention, a blockage can be detected early without stopping the operation of the combustion equipment, and the blockage can be removed within a short time.
It is possible to provide a rain-proofing method for blocking a cyclone, which can be removed by one extinguishing operation, and is extremely effective in practical use.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention, and FIG. 1 is an overall flow diagram.
FIG. 2 is a detailed flow diagram around the cyclone. 1... Combustion tower, 2... Cyclone, 3... Dust hopper, 4... Dust extraction device, 5... Cyclone, 6...
Dust hopper, 7. Dust extraction device, 8. Spoiler, 9, 10. Heat exchanger 1. lI...Ash bunker, 12...Bypass valve, 13...Ash extraction device, 14...Electric dust collector, 15...Chimney, 1st...Bypass, 17...Force blower, 20.2 +, 22.2
3. Damper, 50.5+, 52, 53, 54.5
5...Temperature detector, 56...Control device.

Claims (1)

[Claims] 1. In a method for preventing blockage of a cyclone that separates dust contained in exhaust gas generated in a combustion tower, a blockage signal from a blockage detection mechanism that detects blockage on the under 70 side of the cyclone is used. A method for preventing blockage of a cyclone, which is characterized in that a pressure cutoff mechanism provided on the underflow side is opened, and a wandering force is allowed to flow to the underflow side to remove the blockage. 2. The blockage detection mechanism is a mechanism that opens the pressure cutoff mechanism for a predetermined period of time and detects the blockage state based on the flow state of the exhaust gas on the underflow side. Method. 3. The method according to claim 1, wherein the blockage detection includes detecting the state of blockage by detecting the temperature within the cyclone.