JPH0614735U - Ash intake - Google Patents

Abstract

(57) [Summary] [Purpose] The aim is to ensure that ash is always emitted in an appropriate amount. [Structure] Ash gate that drives the gate plate according to the degree of vacuum in the ash transport pipe to open and close the opening to discharge ash into the transport pipe The gate plate in the ash intake is driven by an air cylinder with a positioner to discharge the ash It is configured so that the opening degree is set according to the property of.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an ash intake that is applied to an ash processing device, an ash transporting device, etc. of a coal-fired boiler.

[0002]

[Prior art]

 FIG. 3 is an explanatory diagram of an ash intake used in a conventional coal-fired boiler ash processing apparatus and the like. In the figure, the ash is discharged from the ash intake by opening and closing the opening 2 of the ash intake according to the degree of vacuum of the ash transport pipe 4, and the air cylinder 3 drives the gate plate 1 to slide the ash. Repeat the two-point operation of only on-off, opening the ash intake opening 2 of the size when the vacuum level of the ash transport pipe 4 exceeds a certain set value, and closing it when it falls below that set value. As a result, the ash in the hopper is dropped onto the ash transport pipe 4 to discharge the ash.

[0003]

[Problems to be solved by the device]

 In the conventional ash intake as described above, ash is easily or difficult to flow out depending on the nature of the coal species used, and the ash to the ash transport pipe 4 is changed every time the coal species used in the boiler changes. As a result, the ash is not properly transported because the discharge is poor and the ash transport pipe 4 is clogged with ash.

[0004]

[Means for Solving the Problems]

 The ash intake according to the present invention aims to solve the above-mentioned problems, and drives the gate plate according to the degree of vacuum in the ash transport pipe to open and close the opening to discharge ash into the ash transport pipe. In the above configuration, an air cylinder with a positioner for driving the gate plate, and means for setting the opening degree of the gate plate to an opening degree suitable for the property of ash to be discharged are characterized.

[0005]

[Action]

 That is, in the ash intake according to the present invention, the gate plate in the ash intake for discharging the ash into the transport pipe by driving the gate plate according to the degree of vacuum in the ash transport pipe to open and close the opening is used as the air cylinder with the positioner. The ash is always set in the transport pipe by opening the opening to a size corresponding to the property of the ash discharged. It is emitted in an appropriate amount.

[0006]

【Example】

 1 and 2 are explanatory views of an ash intake according to an embodiment of the present invention. In the figure, the ash intake according to the present embodiment is used for an ash treatment device of a coal-fired boiler, and the ash discharge in this ash intake is dependent on the degree of vacuum of the ash transport pipe. The gate plate 10 is driven and slid by the air cylinder 12 with a positioner, and the opening 11 of the ash intake of a certain size is sized to match the ash characteristics of the coal species used in the boiler. By opening and closing, the ash in the hopper is dropped onto the ash transport pipe and the ash is discharged.

That is, as shown in FIG. 1, the gate plate 10 has a fan shape and is perforated in a circular shape so as to fit the opening 11, and the opening area of the opening 11 is changed depending on the opening. ing. The opening 11 has a diameter that matches the properties of the most difficult ash species to flow out, and an actuator that drives the gate plate 10 is equipped with an air cylinder 12 with a positioner that operates with an analog signal (4 to 20 mA DC) A. The output circuit of this analog signal A is shown in Fig. 2 so that the opening of the gate plate 10 is optimally set according to the ash property of the coal species used and an appropriate ash emission amount is always obtained. It is built into the ash intake control circuit. The analog signal A is set by the manual setting device 14 to a signal value that makes the opening of the gate plate 10 suitable for the ash property of the coal species used, and is opened to the ash intake in the hopper of the ash processing device. When the command condition is satisfied, the switch 15 activates the analog signal A. Then, the analog signal A is converted into an air signal (0.2 to 1.0 kg / cm ² G) B by which the electropneumatic converter 16 drives the air cylinder 12 with a positioner. The analog signal A is common to the input side of the switch 15, and the ash processing steps of the ash processing device are sequentially No. 1. 1-No. Even when the ash intake is moved to the n hopper, the opening 11 of the ash intake has the same opening. Since the air cylinder 12 with the positioner operates the rod 13 for the distance set by the manual setting device 14 to slide the gate plate 10, the opening 11 has an opening area of a set size. That is, by setting the manual setting device 14 according to an arbitrary coal type to be used, the opening 11 can be opened to a size that matches the characteristics of ash.

As described above, this ash intake uses the air cylinder 12 with a positioner that operates by the analog signal A in the actuator, while making the opening 11 a diameter that matches the property of ash that is the most difficult to flow out. By setting the opening of the gate plate 10 to be variable, the opening 11 can be opened to an optimum size according to the characteristics of the ash of the coal species used, and an appropriate amount of ash emission is always maintained. can get. As a result, the ash is not clogged in the opening 11 and the ash transport pipe and the boiler is operated smoothly, so that the maintenance cost can be reduced.

[0009]

[Effect of device]

 The ash intake according to the present invention is configured as described above, and since the ash is always discharged into the transport pipe at a proper discharge amount, the ash is properly transported without being blocked by the ash. .

[Brief description of drawings]

FIG. 1 is a plan view of an ash intake according to an embodiment of the present invention.

FIG. 2 is a control block diagram thereof.

FIG. 3 (a) is a front view of a conventional ash intake, and FIG. 3 (b) is a bb arrow view in FIG. 3 (a).

[Explanation of symbols]

 10 Gate Plate 11 Opening 12 Air Cylinder with Positioner 13 Rod 14 Manual Setting Device 15 Switch 16 Electro-Pneumatic Converter A Analog Signal B Air Signal

Claims (1)

[Scope of utility model registration request] 1. An air cylinder with a positioner that drives the gate plate in an ash intake that drives a gate plate to open and close an opening to discharge ash into the transportation pipe in accordance with the degree of vacuum in the ash transportation pipe. And a means for setting the opening degree of the gate plate to an opening degree suitable for the characteristics of the discharged ash.