JP3759764B2 - Clinker hopper equipment and its operation method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a clinker hopper for a pulverized coal fired boiler, and more particularly to a clinker hopper facility suitable for treating floating ash contained in overflow water from the clinker hopper and an operation method thereof.
[0002]
[Prior art]
FIG. 2 shows a system diagram for treating floating ash contained in overflow water from a clinker hopper for a conventional pulverized coal fired boiler. A plurality of clinker hoppers 2 are provided at the bottom of the boiler furnace 1. In the example shown in FIG. 2, two clinker hoppers 2 are provided, and a cooling water supply system and a clinker ash discharge system are connected to each clinker hopper 2. Also, a boiler furnace water cooling wall lower pipe header 3 and a seal plate 4 are provided at the lower end of the boiler furnace 1, and the seal plate 4 is below the water surface in the seal plate trough 5 provided at the boundary with the clinker hopper 2. Is arranged to reach. A refractory material 6 is stretched on the inner wall surface of the clinker hopper 2.
[0003]
The clinker ash dropped from the boiler furnace 1 is cooled by the water in the clinker hopper 2 and stored for a certain time (usually 8 hours), and then discharged from the ash gate 11 provided at the bottom of the clinker hopper 2 one by one. It is sent to the ash gate enclosure 12. In the ash gate enclosure 12, the clinker ash is crushed into a size of 25 mm × 25 mm or less, which is suitable for pipe transportation, by a crusher 13 provided at the bottom of the ash gate enclosure 12. It is transported to slurry. At this time, the ejector high-pressure water inlet valve 16 and the ejector outlet valve 17 are fully opened, and the high-pressure water pump 15 connected to the pipe upstream of the ejector high-pressure water inlet valve 16 is started, so that the ash and hopper water in the enclosure 12 are Is delivered by the ejector 14 and conveyed to the ash basin 18.
[0004]
Since the water temperature inside the clinker hopper 2 is constantly raised by the radiant heat from the boiler furnace 1 and the heat brought in by the clinker ash that has fallen, the cooling water is always supplied from the low-pressure water pump 22. This cooling water joins the boiler furnace 1 and the clinker hopper 2, and is first supplied to a seal trough 5 for the purpose of blocking external air, and then overflows into the clinker hopper 2. The water cooled in the clinker hopper 2 is discharged out of the clinker hopper 2 through the overflow port 7 provided on the wall surface of the clinker hopper 2.
[0005]
FIG. 3 shows an enlarged view of the cross-sectional structure of the overflow port 7 of FIG. Although the weir 26 for preventing the floating ash 28 from flowing out of the clinker hopper 2 is attached to the overflow port 7, it is impossible to completely prevent the floating ash 28 from flowing out. Overflow water is discharged from the flange 27 portion to the seal box 9 through the overflow pipe 8 together with some floating ash 28.
[0006]
The seal box 9 has a function of preventing the level of water stored in the clinker hopper 2 from being lowered when the ash is discharged from the clinker hopper 2, and the seal between the boiler furnace 1 and the outside air is not broken. The tip of is sealed with water stored in the seal box 9. The overflow water introduced into the seal box 9 is further discharged to the overflow water pit 21, and the overflow water is further discharged to the water storage tank or ash basin 20 by the drain pump 19.
[0007]
[Problems to be solved by the invention]
In the above prior art, no consideration is given to the amount and size of the floating ash 28 contained in the overflow water from the clinker hopper 2, and depending on the fuel coal type of the boiler, for example, a large floating ash 28 of about 10 cm × 10 cm. Is contained in the overflow water in a large amount and cannot be conveyed by the overflow water drain pump 19, so that a large amount of floating ash 28 accumulates in the overflow water pit 21, which makes it impossible to continue the operation of the boiler.
[0008]
As an example of countermeasures against this problem, there is an example in which a screen 30 having an opening of about 25 mm is installed at the outlet of the seal box 9 as shown in FIG. It is necessary to remove the ash 28 manually.
[0009]
An object of the present invention is to discharge overflow water drainage from the system without greatly installing additional equipment and equipment even if the overflow water from the clinker hopper contains a large amount of large floating ash. Another object of the present invention is to continuously pulverize the floating ash to a size that can be transported by a pump even if the overflow water from the clinker hopper contains a large amount of large floating ash. Furthermore, an object of the present invention is to continuously pulverize a large amount of large floating ash contained in overflow water from a clinker hopper to a size that can be transported by a pump, thereby enabling stable continuous operation of the boiler. is there. Another object of the present invention is to enable inspection and repair of clinker hopper equipment even during continuous operation of the boiler.
[0010]
[Means for Solving the Problems]
The above object of the present invention is achieved by the following configuration. That is, in a clinker hopper that is installed under a boiler furnace of a pulverized coal fired boiler, cools clinker falling from the boiler furnace with cooling water, and temporarily stores the clinker hopper, the clinker hopper includes a plurality of clinker hoppers. can select a crusher installed in the outlet, the flow path of the overflow water of the cooling water is introduced into the crusher to be introduced into each of the clinker hopper, provided in the flow path, the crusher of introducing the overflow water A clinker hopper facility provided with a selection means .
[0011]
Furthermore, a first flow path to a discharge system for discharging water introduced into the crusher and a second flow path for discharging water introduced into the crusher to a discharge system different from the discharge system connected to the first flow path And the first flow path so that the overflow water introduced into the crusher is introduced into the first flow path, and the water introduced into the crusher from the outlet of the clinker hopper is introduced into the second flow path. The clinker hopper facility according to claim 1, further comprising flow path selection means provided in each of the second flow paths .
[0013]
The above object of the present invention can also be achieved by the following configuration. That is, the operation of the clinker hopper facility that is installed under the boiler furnace of the pulverized coal fired boiler, the clinker falling from the boiler furnace is cooled and temporarily stored with cooling water , and a plurality of clinker hoppers each having a crusher are provided at each outlet. a method to select a crusher for introducing water overflowed from the clinker hopper in a cooling water introduced into each of the clinker hopper, by introducing water to the overflow to the crusher was the selected and the overflow water Is a method of operating a clinker hopper facility that pulverizes large floating ash contained in the water to a size that can be conveyed by a pump, and then sends out overflow water.
[0014]
In addition, each clinker hopper is used one by one, and the clinker in the clinker hopper is discharged to a crusher installed at the outlet of the clinker hopper, and then the overflow water from the clinker hopper is discharged to the crusher from which the clinker is discharged. The operation method of the clinker hopper facility according to claim 3 , wherein the introducing step is sequentially repeated in all clinker hoppers.
[0015]
[Action]
For example, an ash gate enclosure having an overflow port provided in the clinker hopper and a crusher in the lower part as a flow path for introducing water into which the cooling water introduced into the clinker hopper overflows from the clinker hopper. The flow path of overflow water connecting In this case, the floating ash contained in the overflow water flows into the crusher installed in the ash gate enclosure, and the large floating ash is pulverized to approximately 25 mm × 25 mm or less by the crusher and temporarily stored in the overflow water storage tank. However, since the floating ash is pulverized sufficiently small by the crusher, the overflow water in the overflow water storage tank is of a size that can be transported by a drain pump or the like (usually 30 mm × 30 mm or less). You don't have to worry about the bottom.
[0016]
Also, a plurality of clinker hoppers are provided in the boiler furnace, and each clinker hopper is used one by one, and the clinker in the clinker hopper is discharged to a crusher installed at the clinker hopper outlet, and then overflow water from the clinker hopper If the operation method of repeatedly introducing the clinker into the crusher from which the clinker is discharged is used in an orderly manner in all clinker hoppers, it is possible to operate the boiler without stopping it even when checking and repairing crushers that are not in use. Is possible.
[0017]
【Example】
An embodiment of the present invention will be described with reference to the drawings.
In the present embodiment shown in FIG. 1, members having the same functions as those of the prior art shown in FIG.
The present embodiment shown in FIG. 1 has a pipe 32 for supplying overflow water from the seal box 9 to the ash gate enclosure 12 and a pipe 33 for discharging overflow water from the crusher 13 to the overflow water pit 21 in the apparatus shown in FIG. The overflow water valves 23 and 25 of the pipes 32 and 33 are added, respectively, and the ejector inlet valve 24 is provided in the pipe connecting the crusher 13 and the ejector 14.
[0018]
The clinker ash dropped from the boiler furnace 1 is cooled by the water in the clinker hopper 2 and stored for a certain time. The clinker hopper 2 is always cooled by the low pressure water pump 22 for the purpose of preventing the hopper water temperature from rising due to the radiant heat from the boiler furnace 1 and the heat brought in by the clinker ash that has fallen, and refilling the sealed water in the seal trough 5. Water is supplied via the seal trough 5. The cooling water supplied into the clinker hopper 2 is continuously introduced from the overflow port 7 through the seal box 9 into one of the two ash gate enclosures 12. Which one of the two ash gate enclosures 12 is selected is determined by the overflow water valve 23, and the crusher 13 on the side receiving the overflow water is continuously operated, and a large floating ash 28 (see FIG. 3) is crushed to approximately 25 mm × 25 mm or less by the crusher 13 and discharged to the overflow water pit 21 through the overflow water valve 25 together with the overflow water. Further, the overflow water discharged to the overflow water pit 21 and the floating ash crushed to 25 mm × 25 mm or less are discharged to the water storage tank or the ash basin 20 by the overflow water drain pump 19.
[0019]
On the other hand, the clinker stored in the clinker hopper 2 for a certain period of time is sequentially ashed out one by one. Below, the example of a procedure of the ash extraction operation | movement of the clinker hopper 2 which is this invention is shown.
(1) Select one of the two clinker hoppers 2 to perform the ash removal operation. First, the clinker hopper 2 that performs the ash removal operation is assumed to be on the ash gate enclosure 12 side that does not accept overflow water.
(2) The crusher 13 and the high-pressure water pump 15 provided in the ash gate enclosure 12 on the side where the ash removal operation is selected are started, and the ejector outlet valve 17 is fully opened.
(3) The ejector high pressure water inlet valve 16 on the clinker hopper 2 side during the ashing operation is fully opened, the ejector inlet valve 24 is fully opened, and the ash gate 11 is fully opened. By doing so, the ash and the hopper water are sent out by the ejector 14 through the enclosure 12 and conveyed to the ash disposal basin 18.
(4) When the water level in the clinker hopper 2 decreases and the discharge of the clinker inside is completed, the ash gate 11 of the hopper 2 is fully closed. Further, the ejector high-pressure water inlet valve 16 of the hopper 2 is fully closed, and the ejector outlet valve 17 is fully closed. Thereby, the delivery of ash and hopper water from the ejector 14 is stopped.
[0020]
In addition, after the ash treatment in one clinker hopper 2 is performed by the steps (1) to (4), overflow water is received in the clinker hopper 2 in the following steps (5) to (9). . At this time, the floating ash 28 in the overflow water can be treated.
(5) The overflow water valve 25 and the overflow water valve 23 on the hopper 2 side are fully opened, and the ejector inlet valve 24 is fully closed. Thereby, the overflow water including the large floating ash 28 is guided into the ash gate enclosure 12.
(6) Next, the overflow water valve 23 and the overflow water valve 25 on the ash gate enclosure 12 side receiving the overflow water are fully closed, and the ejector inlet valve 24 is fully opened.
(7) Next, the ash removal operation of the hopper 2 on the ash gate enclosure 12 side that has received the overflow water is selected, and the ash removal operation similar to the above is performed.
(8) When discharging of the clinker of the hopper 2 is completed, the ash gate 11 of the hopper 2 is fully closed, and the ejector high-pressure water inlet valve 16, the ejector outlet valve 17 and the ejector inlet valve 24 of the hopper 2 are fully closed. And the crusher 13 is stopped.
(9) Further, the high pressure water pump 15 is stopped, and the ash removal operation from the clinker hopper 2 is completed.
[0021]
By the operation as described above, the floating ash 28 discharged together with the overflow water from the overflow port 7 of the clinker hopper 2 is introduced into the ash gate enclosure 12 through the seal box 9. The overflow water containing the floating ash 28 introduced into the ash gate enclosure 12 flows into the crusher 13 installed at the bottom of the ash gate enclosure 12, and the large ash 28 is pulverized to approximately 25 mm × 25 mm or less by the crusher 13, The water is discharged to the overflow water pit 21 through the overflow water valve 25. As a result, the floating ash 28 is all crushed to a size that can be conveyed by the overflow water drain pump 19, so that it does not remain in the overflow water pit 21, and the water tank or ash pond is retained by the overflow water drain pump 19. Therefore, it is not necessary to stop the boiler and clean the bottom of the overflow water pit 21.
[0022]
According to the present embodiment, the crusher 13 used only during the ash removal operation from the clinker hopper 2 can be used for crushing the large floating ash 28 contained in the overflow water from the clinker hopper 2, and the overflow water pit 21. It becomes possible to eliminate the floating ash 28 remaining inside. In addition, since the two crushers 13 can be used alternately, even when the crusher 13 is inspected and repaired, it can be operated without stopping the boiler.
[0023]
【The invention's effect】
According to the present invention, the large floating ash contained in the overflow water from the clinker hopper is continuously pulverized to a size that can be transported by a pump without the need for significant additional installation of equipment and equipment, and overflow water drainage Since it can be discharged out of the system by the pump, it is not necessary to stop the boiler and clean the overflow water pit, and it is possible to ensure stable continuous operation of the boiler and save labor.
[Brief description of the drawings]
FIG. 1 is a system diagram of a clinker hopper device according to an embodiment of the present invention.
FIG. 2 is a system diagram of a conventional clinker hopper device.
FIG. 3 is a detailed cross-sectional structure diagram of an overflow port of a clinker hopper.
FIG. 4 is a cross-sectional view of a prior art seal box.
[Explanation of symbols]
1 ... Boiler furnace, 2 ... Clinker hopper, 7 ... Overflow port,
9 ... seal box, 11 ... ash gate,
12 ... Ashgate enclosure, 13 ... Crusher,
14 ... ejector, 15 ... high pressure water pump, 16 ... high pressure water inlet valve,
17 ... Ejector outlet valve, 18, 20 ... Water tank or ash pond,
19 ... overflow water drain pump, 21 ... overflow water pit,
23, 25 ... Overflow water valve, 24 ... Ejector inlet valve, 28 ... Floating ash,
32, 33 ... Piping

Claims (4)

In a clinker hopper that is installed under the boiler furnace of a pulverized coal fired boiler, cools the clinker falling from the boiler furnace with cooling water, and temporarily stores it,
The clinker hopper is composed of a plurality of clinker hoppers ,
Crushers installed at the exit of each clinker hopper ,
Water overflowing cooling water introduced into each of the clinker hopper and the flow path for introducing to the crusher,
Provided the flow path, clinker hopper equipment, characterized in that it comprises a a <br/> selection means for selecting a crusher of introducing the overflow water. Furthermore, a first flow path to a discharge system for discharging water introduced into the crusher,
A second flow path for discharging water introduced into the crusher to a discharge system different from the discharge system connected to the first flow path;
The first flow path and the second flow path are introduced so that the overflow water introduced into the crusher is introduced into the first flow path, and the water introduced into the crusher from the outlet of the clinker hopper is introduced into the second flow path. A flow path selection means provided in each flow path;
The clinker hopper facility according to claim 1, further comprising: Installed in boiler furnace of a pulverized coal fired boiler, a clinker dropping from the boiler furnace and stored temporarily cooled by the cooling water, in clinker hopper equipment operation method in which a plurality of clinker hopper having a crusher to respective outlets There ,
Select the crusher for introducing water overflowed from the clinker hopper in a cooling water introduced into each of the clinker hopper,
Introducing the overflowing water into the selected crusher ;
Large浮灰contained in water that has the overflow ground to below the size that can be conveyed is by a pump,
A method of operating the clinker hopper facility, characterized in that the overflow water is then discharged. Each clinker hopper is used one by one in sequence, the clinker in the clinker hopper is discharged to a crusher installed at the outlet of the clinker hopper, and then the overflow water from the clinker hopper is introduced into the crusher from which the clinker is discharged. 4. The method of operating a clinker hopper facility according to claim 3 , wherein the process is sequentially repeated in all clinker hoppers.

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