JPH04320701A - Switching control mechanism of deaerator in refuse incinerator - Google Patents

Abstract

PURPOSE:To carry out automatic switching control of two deaerators by providing six motor-operated valves and two deaerator water level sensors for a refuse incinerator with a normal deaerator and predeaerator and monitoring the state of full opening or full closing of those six motor-operated valves and, at the same time, operating those valves. CONSTITUTION:A motor-operated valve E that opens and closes the steam communication line between two deaerators 100 and 110, motor-operated valve F that opens and closes the water communication line between the two deaerators 100 and 110, motor-operated valves G-1 and G-2 that open and close the excessively high level prevention line of a boiler feed water pump 140, motor-operated valve H-1 and H-2 that become the outlet valves of the deaerators 100 and 110, water level sensors S1.L-1 and S2.L-2 that detect water levels from the bottoms of the deaerators 100 and 110 to NWL are provided. And, it is possible to carry out automatic switching control of the two deaerators by controlling those valves according to a control flow.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deaerator switching control mechanism for a waste incinerator equipped with a regular deaerator and a standby deaerator.

0002

[Prior Art] In a waste incinerator equipped with a regular deaerator and a standby deaerator, it is necessary to switch the deaerator when inspecting the deaerator in use. be. Conventionally, switching the deaerator during operation of a waste incinerator required a skilled technique, and required a high degree of operation by a skilled operator.

That is, conventionally, in a waste incinerator equipped with a regular deaerator and a standby deaerator, a plurality of manual valves installed in the piping system of each deaerator are checked one by one, and the situation is judged individually. During opening and closing operations, if there is a large pressure difference between the two deaerators, hammering may occur, which is extremely dangerous.
The problem with operability remains that the pressure of the deaerator that is inactive must be increased independently, and the manual valves must be opened and closed with good judgment while monitoring the pressure and water level of the two deaerators.

0004

[Problems to be Solved by the Invention] As mentioned above, in a waste incinerator equipped with a regular deaerator and a preliminary deaerator,
Switching the deaerator during operation requires skilled technique, and a skilled operator must always be present.

[0005] The present invention has been made in view of the above circumstances.
In a waste incinerator equipped with a regular deaerator and a standby deaerator, the deaerator can be switched automatically without manual intervention, thereby eliminating the need for skilled operators to switch the deaerator. An object of the present invention is to provide a deaerator switching control mechanism for a waste incinerator that can smoothly, safely, and highly reliably perform a deaerator switching operation.

[0006]

[Means for Solving the Problems] In order to solve the above-mentioned conventional problems, the present invention provides six electric valves (E, F, G-1, G-2, H) as shown in FIG. -1, H-2) and 2
Deaerator water level sensors (S1, L-1, S2, L-2) were added. In addition, six additional electric valves (E, F
, G-1, G-2, H-1, H-2) are designed to enable the control and monitoring device of a waste incineration plant to monitor the fully open and fully closed states and also to enable operation. Two additional water level sensors (S1, L-1, S2, L-2) can detect from the bottom of the deaerator to a predetermined NWL. Here, the electric valve (E) has two deaerators 100
, 110. Electric valve (F)
opens and closes the water communication line between the two deaerators 100 and 110. The electric valves (G-1, G-2) open and close the over-rise prevention line of the boiler feed water pump 140. Electric valve (H-1, H-2)
is the outlet valve of each deaerator 100, 110.

The above six electric valves (E, F, G-1, G
-2, H-1, H-2) and two deaerator water level sensors (
By adding S1.L-1, S2.L-2), the two deaerators 100 and 110 are automatically switched.

[0008]

[Operation] The above six electric valves (E, F, G-1, G-2,
H-1, H-2) and control valves (B-1, B-2, C-1
, C-2), and solenoid valve (D), etc., to the deaerator water level sensor (
The two deaerators 100 and 110 of the waste incinerator can be automatically switched by using the outputs of S1 ・L-1, S2 ・L-2) and controlling according to the control flow shown in FIGS. 2 to 4. This makes it possible to easily and safely switch deaerators even in plants without skilled operators.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram of the piping system around the deaerator of a waste incineration plant.

In FIG. 1, 100 is the No. 1 deaerator;
0 is a No. 2 deaerator, 120 is a condensate tank, 130 is a deaerator feed water pump, 140 is a boiler feed water pump, and 150 is a high pressure steam reservoir.

B-1, C-1, B-2, and C-2 are control valves, respectively. Among these, B-1 is No. 1 deaerator 100
This is a control valve inserted in the steam line of the controller P-1.
Opening/closing is controlled by B-2 is a control valve inserted in the steam line of the No. 2 deaerator 110, and its opening and closing are controlled by a controller P-2. C-1 is a control valve inserted in the water supply line of the No. 1 deaerator 100 that communicates with the deaerator water supply pump 130, and is automatically controlled to open and close by the controller L-1 that receives the detection output of the water level sensor S1. Ru. C-2 is a control valve inserted in the water supply line of the No. 2 deaerator 110 that communicates with the deaerator water supply pump 130, and is automatically opened and closed by a controller L-2 that receives the detection output of the water level sensor S2. Ru.

[0012] A, G-1, H-1, E, F, G-2, H
-2 are electric valves. Of these, E, F, G-
1, G-2, H-1, H-2 are electric valves newly installed to realize this invention, and E is two deaerators 1.
Electric valve that opens and closes the steam communication line between 00 and 110, F
G-1 is an electric valve that opens and closes the water communication line between the two deaerators 100 and 110, G-1 is an electric valve that opens and closes the over-rise prevention line of the boiler feed water pump 140 of the No. 1 deaerator 100, G-2
is an electric valve that opens and closes the excessive rise prevention line of the boiler feed water pump 140 of the No. 2 deaerator 110, and H-1 is the No. 1 deaerator 100
H-2 is the outlet valve of the No. 2 deaerator 110. D is a solenoid valve interposed in the steam communication line.

[0013] L-1, L-2, P-1, and P-2 are respective controllers, and among these, L-1 is the No. 1 deaerator 100.
A controller L-2 automatically opens and closes the control valve C-1 in response to the detection output from the water level sensor S1 of the No. 2 deaerator 110, and L-2 controls the control valve C-1 in response to the detection output from the water level sensor S2 of the No. 2 deaerator 110. P-1 is a controller that automatically controls the opening and closing of the control valve B-2, P-2 is a controller that controls the opening and closing of the control valve B-2. 2 to 4 are flowcharts each showing a control procedure according to an embodiment of the present invention. The operation of one embodiment of the present invention will now be described with reference to the above figures. Here, it is assumed that the No. 1 deaerator 100 is currently being used, and the water has been drained from the No. 2 deaerator 110.

At this time, electric valves A, G-1, H-1 are fully open, electric valves E, F, G-2, H-2 are fully closed, and control valve B-
1 and C-1 are automatic, and control valves B-2 and C-2 are fully closed. 1). Control valve B-2, C-2, solenoid valve D, electric valve E, F
, G-2, and H-2 are fully closed (steps 1 to 14). 2). The control valve C-2 is slightly opened (step 15) and waits until the water level of the No. 2 deaerator 110 reaches the set value (step 16). 3). Adjust the control valves B-2 and C-2 automatically to set the water level and pressure of the No. 2 deaerator to the rated values (steps 17 to 25). 4). After manually fully closing the control valves C-2 and B-2, fully open the electric valves E, F, G-2, and H-2 (step 2).
6-43).

5). After gradually opening the control valve C-2 to bring the difference in opening degree between the control valve C-2 and the control valve C-1 within the set value, the control valve C-2
is set to automatic, control valve C-1 is set to manual, and waits until the water level of No. 2 deaerator reaches the rated level (steps 44 to 48).

6). After the control valve B-2 gradually opens until the difference in opening with the control valve B-1 becomes within the set value, the control valve B-2 opens again.
-2 is set to automatic, control valve B-1 is set to manual, and waits until the pressure of No. 2 deaerator becomes rated (steps 49 to 53).

7). Control valve C-1 and control valve B-1 are each fully closed. This completes the switching of the deaerator from the No. 1 deaerator 100 to the No. 2 deaerator 110 (steps 53 to 56). 8). Manually operate electric valves E and F on site.
, G-1 are fully closed, and the electric valve H-1 is fully opened to drain water. After that, the electric valve H-1 is fully closed.

[0018] In this way, the two deaerators 100 and 110 of the waste incinerator can be automatically switched, and the deaerators can be easily and safely switched even in plants without skilled operators. becomes.

[0019]

[Effects of the Invention] As described above, according to the present invention, it is possible to automatically switch between two deaerators in a waste incinerator, and switching can be done easily and safely even in plants without skilled operators. It became.

[Brief explanation of drawings]

FIG. 1 is a piping system diagram of a deaerator switching control mechanism in an embodiment of the present invention.

FIG. 2 is a flowchart showing a control procedure of the system configuration shown in FIG. 1;

FIG. 3 is a flowchart showing a control procedure for the system configuration shown in FIG. 1;

FIG. 4 is a flowchart showing a control procedure for the system configuration shown in FIG. 1;

[Explanation of symbols]

100... No. 1 deaerator, 110... No. 2 deaerator, 120... Condensate tank, 130... Deaerator feed water pump, 140... Boiler feed water pump, 150... High pressure steam reservoir, B-1, C-1, B
-2, C-2...Control valve, A, G-1, H-1, E, F,
G-2, H-2...Electric valve, D...Solenoid valve, L-1, L-2
, P-1, P-2...Controller, S1, S2...Water level sensor.

Claims (1)

[Claims] Claim 1: In a waste incinerator equipped with a regular deaerator and a standby deaerator, a water level detection means for detecting the water level of each of the deaerators, and a steam communication line between the deaerators is opened and closed. a motorized valve that opens and closes the water communication line between the deaerators, a motorized valve that opens and closes the boiler feed water pump overrise prevention line of each of the deaerators, and an outlet valve of each of the deaerators. A deaerator switching control mechanism for a waste incinerator, characterized in that the two deaerators are switched and controlled by controlling each of these valves according to a control flow.