JPH1190274A - Cyclone apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the pressure loss of a cyclone to be constant by a method in which a differential pressure gauge for measuring the pressure difference between the inlet part and outlet part of a cyclone is provided, an inflow velocity control means is operated so that a value detected by the gauge maintains a set value. SOLUTION: A differential pressure gauge 15 is installed to be connected with an inflow system communicating with an inlet part 7 and an outflow system communicating with an outlet part 9, which measures the difference between an inflow gas pressure in the inlet part 7 and an outflow gas pressure in the outlet part 9, and inputs the measured value into a PID controller 14 through a signal line. The controller 14 which received a signal from the gauge 15 operates a cylinder device 13 corresponding to the input value to opening/ closing-operate a movable blade plate 10 which is an inflow velocity control means. In this way, the pressure loss of a cyclone 1 can be controlled to be constant, stabilizing the recovery percentage of soot and dust.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a sewage sludge incinerator,
The present invention relates to a cyclone device used for removing dust in a dryer, a refuse incinerator, and the like.

[0002]

2. Description of the Related Art In a sewage sludge fluidized incinerator or the like, an exhaust gas cyclone is installed for collecting incinerated ash. The absolute amount of the exhaust gas as a load on the exhaust gas cyclone changes depending on the operating state of the incinerator. The operating state of the incinerator varies with the sludge injection conditions for the furnace, for example, sludge treatment amount, sludge moisture amount, heat value, etc.,
The sludge charging conditions often differ for each unit of sludge supplied to the furnace. The absolute amount of exhaust gas generated from the incinerator fluctuates due to changes in sludge input conditions,
Despite the dramatic changes, the cyclone was coping with the same thing, leaving the ash recovery to come and go as the inlet gas volume fluctuated.

[0003]

The exhaust gas treatment system of the incinerator described above is provided with a dust remover such as a cyclone, an electric dust collector, a smoke exhaust tower, etc. Among them, the cyclone has the largest pressure loss. , It was necessary to afford the induction blower. The performance of a cyclone depends greatly on its dimensional ratio.In addition, due to the structure of the cyclone, as the inlet gas volume increases, the pressure loss increases in proportion to the square of the inflow gas volume, and the ash recovery rate also increases. It is significantly improved. However, when the amount of inflow gas is reduced, the performance cannot be exhibited at all.

The present invention has been made to solve the above-mentioned problems, and aims to stabilize the recovery rate by controlling the pressure loss of the cyclone to be constant, and to reduce the load on other dust removal equipment and the capacity of the induction blower. It is an object of the present invention to provide a cyclone device capable of downsizing equipment.

[0005]

In order to solve the above-mentioned problems, a cyclone device according to the present invention is provided with an inflow speed control means for increasing / decreasing a flow passage width at an inlet of a cyclone. A differential pressure gauge for measuring the differential pressure between the pressure sensor and the section is provided, and control means for operating the inflow speed control means is provided so that the value detected by the differential pressure gauge maintains a set value.

In the above configuration, the pressure loss in the cyclone increases and decreases in proportion to the square of the inflow gas amount, and the increase and decrease in the pressure loss causes an increase and decrease in the flow rate of the inflow gas, and the dust and dust increase in proportion to the square of the flow rate of the inflow gas. Recovery rate increases or decreases.
The pressure loss in the cyclone is synonymous with the pressure difference between the inlet and the outlet, and the pressure loss is stabilized by maintaining a constant pressure difference between the inlet and the outlet.

For this reason, when the value detected by the differential pressure gauge falls below the set value, it is determined that the pressure loss and the gas flow velocity at the inlet are reduced due to the decrease in the amount of inflow gas, and the inflow speed control means is operated by the control means. By reducing the width of the flow path at the inlet of the cyclone, the pressure loss with respect to the inflow gas is increased to a set value, the flow velocity of the inflow gas at the inlet is recovered, and the dust collection rate is stabilized.

If the value detected by the differential pressure gauge exceeds the set value, it is assumed that the pressure loss and the gas flow velocity at the inlet have increased due to the increase in the amount of inflow gas, and the inflow speed control means is operated by the control means to control the cyclone. By increasing the width of the flow path at the inlet, the pressure loss with respect to the inflow gas is reduced, the flow velocity of the inflow gas at the inlet is suppressed, and the dust collection rate is stabilized. At this time, if the value detected by the differential pressure gauge exceeds the set value even when the flow path width at the inlet of the cyclone is fully opened by the inflow speed control means, the increase in the flow velocity contributes to the improvement of the dust collection rate. Therefore, no further operation is performed on the assumption that no adverse effect occurs.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG.
Is composed of an upper straight cylindrical part 2, a lower tapered separating part 3 following the cylindrical part 2, and a lowermost hopper 4 following the separating part 3, and a lower end of the hopper 4 has a rotor valve. Five. The cylindrical portion 2 has an inflow gas 6 connected to a side wall.
And an outlet portion 9 of the exhaust gas 8 composed of a rising pipe inserted through the ceiling wall and inserted into the cylindrical portion 2.

A movable blade 10 constituting an inflow speed control means is provided at the inlet section 7 so as to be freely opened around the axis of a support shaft 11. A drive arm 12 fixed to the support shaft 11 has a movable blade A cylinder device 13 for driving the motor 10 is connected, and a PID control device 14 for controlling the driving of the cylinder device 13 is connected to the cylinder device 13.

A differential pressure gauge 15 is provided in connection with the inflow system communicating with the inlet 7 and the outflow system communicating with the outlet 9, and the differential pressure gauge 15 is provided with an inflow gas pressure at the inlet 7 and an outflow at the outlet 9. It measures the pressure difference between the gas pressures, and inputs the measured value to the PID controller 14 through a signal line.

The operation of the above configuration will be described below. The inflow gas 6 supplied to the cyclone 1 flows in the tangential direction from the inlet portion 7 to the cylindrical portion 2, flows along the inner wall surface of the cylindrical portion 2, and becomes a rotating flow and descends the separation portion 3. Thereafter, the inflow gas 6 reverses and rises at the downstream outlet 3 a of the separation unit 3, and flows out as exhaust gas through the outlet 9.

During this time, the dust that has flowed into the cyclone 1 together with the inflowing gas 6 moves to the outer peripheral side of the rotating flow under centrifugal force, descends while flowing on the inner wall surface of the cylindrical portion 2 and the separating portion 3, and moves downstream. It falls into the hopper 4 from the discharge port 3a.
Dust retained in the hopper 4 is taken out by opening the rotary valve 5.

The fact that the value detected by the differential pressure gauge 15 is lower than the set value indicates that the inflow of the inflow gas 6 has decreased, and as a result, the pressure loss and the gas flow rate at the inlet 7 have decreased. Received the signal from the differential pressure gauge 15
The ID control device 14 operates the cylinder device 13 according to the input value to close the movable blade 10.

As a result, the inlet 7 of the cyclone 1
, The pressure loss with respect to the inflow gas 6 is increased to a set value, the flow velocity of the inflow gas 6 at the inlet 7 is recovered, and the dust collection rate is stabilized.

If the value detected by the differential pressure gauge 15 exceeds the set value, it is determined that the pressure loss and the gas flow velocity at the inlet 7 have increased due to the increase in the inflow of the inflow gas 6, and a signal from the differential pressure gauge 15 is received. The PID control device 14 operates the cylinder device 13 according to the input value to operate the movable blade 1
Open 0.

As a result, the inlet 7 of the cyclone 1
, The pressure loss with respect to the inflow gas 6 is reduced to a set value, the flow velocity of the inflow gas 6 at the inlet 7 is suppressed, and the dust collection rate is stabilized.

At this time, if the value detected by the differential pressure gauge 15 exceeds the set value even after the movable vane plate 10 is opened and the flow path width at the inlet 7 of the cyclone 1 is fully opened, the increase in the flow velocity is Since it contributes to the improvement of the dust collection rate, no further operation is performed as long as no adverse effect occurs.

[0019]

As described above, according to the present invention, the flow width at the inlet of the cyclone is increased or decreased by the inflow speed control means in accordance with the value detected by the differential pressure gauge, and the pressure loss for the inflow gas is set. By maintaining the value at the value, the flow rate of the inflow gas at the inlet portion can be recovered, and the dust collection rate can be stabilized.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a cyclone showing an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a main part of the cyclone according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cyclone 2 Cylindrical part 3 Separation part 4 Hopper 5 Rotor valve 6 Inflow gas 7 Inlet part 8 Exhaust gas 9 Outlet part 10 Movable wing plate 11 Support shaft 12 Drive arm 13 Cylinder device 14 PID control device 15 Differential pressure gauge

Claims (1)

[Claims] An inflow speed control means for increasing and decreasing a flow path width is provided at an inlet of a cyclone, a differential pressure gauge for measuring a differential pressure between an inlet and an outlet of the cyclone is provided, and a value detected by the differential pressure gauge is provided. A cyclone device comprising control means for operating an inflow speed control means so as to maintain a set value.