JP3217544B2 - Water ring type bottom ash conveyor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water ring type bottom ash conveyor device.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional water ring type bottom ash conveyor device. In FIG. 2, reference numeral 1 denotes a casing of a water-sealed hearth ash conveyor (hereinafter referred to as a water-sealed conveyor);
2 is a chain with a scraper, 3 is a water tank of a water sealing conveyor,
4 is a water level in the water tank 3 and 5 is a gear for guiding the chain 2 with the scraper. Reference numeral 6 denotes a drive gear, and 10 denotes a motor, which rotates the drive gear 6 by a drive system (not shown). Thereby, the chain 2 with the scraper scrapes up the furnace bottom ash in the direction of the arrow in the figure and drops it into the bottom ash silo 30. Reference numeral 7 denotes water in the water seal conveyor 3.

The ash generated in the boiler furnace 50 falls on the water surface separated from the furnace bottom hopper 60 by the water level 4. 1
1 is a lower part of a water-sealed conveyor casing, 12 is a foundation, and 21 is makeup water. This makeup water 21 is the water tank 3 of the water sealing conveyor.
By maintaining the water level 4 in the boiler furnace 50
Even if the internal pressure fluctuates, the lower end of the hearth hopper 60 is water-sealed, so that high-temperature gas is not blown out near the water-sealed conveyor. Further, the furnace bottom ash can be collected without sucking the atmosphere into the furnace 50.

An ON / OFF valve 22 is controlled by a level switch 26. 23 is ON ・ OF
This is a bypass replenishing valve for replenishing the bypass when the F valve 22 fails. 24 is a makeup water line. Reference numeral 30 denotes a bottom ash silo for storing bottom ash (furnace bottom ash) collected by a water-sealed conveyor, which is not directly related to the present invention. Bottom ash is a system carried out by the illustrated truck.

A drain valve 100 drains water from the water tank 3 of the water-sealed conveyor to the sedimentation tank 103 arbitrarily. 10
Reference numeral 1 denotes an overflow box, but a large box was necessary to always overflow. Further, since the overflow pipe 102 is also connected to the drain valve 100, it is necessary to worry about clogging due to ash in the water sealing conveyor. The circulating water that overflows into the precipitation tank 103 generates a precipitate 110 and then passes through an overflow weir 105 to remove ash into the precipitation tank 103.

[0006] From the circulating water tank 104 to the pump filter 11
5, the circulating water passes through the slurry pump 120 and the check valve 121, passes through the pipe 130, and is supplied to the water ring conveyor water tank 3 in a closed loop. As described above, the circulating water system is provided in the conventional apparatus because the water 7 in the water tank 3 of the water ring conveyor facing the furnace bottom hopper 60 is heated from the water surface (radiant heat, hopper heat transfer). Rises (10
(Near 0 ° C.) because of the cooling by installing a circulating water system and the idea of preliminary make-up water.

For this reason, the conventional water-sealed conveyor device has the following disadvantages.

(1) The water-sealed conveyor is an ash recovery conveyor. However, since a circulating water system is provided outside the system, production costs are reduced.
A large running cost was required, and circulating water was constantly flowing, resulting in a lot of waste.

(2) The sedimentation tank 103 and the circulating water tank 104 must be at least larger than the volume of water stored in the water-sealed conveyor, which makes construction work expensive.

(3) The circulating water pump 120 used in the circulating water system is operated under conditions that are liable to wear, so that the specifications are expensive due to measures against slurries, and the circulating water pump 120 consumes severely and requires power to drive it. Therefore, the running cost was high.

(4) The ash stored in the sedimentation tank 103 is hardened and difficult to discharge. Therefore, the ash is discharged by a vacuum car about once a month or is discharged manually so that maintenance is troublesome.

[0012]

SUMMARY OF THE INVENTION The present invention is designed to eliminate the use of the circulating water system, which has been a cause of the drawbacks of the conventional water-sealing conveyor device, and to achieve its function sufficiently as a water-sealing conveyor. It is an object to provide such a device.

[0013]

According to the present invention, there is provided a water tank disposed below a furnace bottom hopper and containing water for water sealing, a chain with a scraper for scraping ash in the water tank, and a water tank in the water tank. In order to solve the above problem, a circulating water system for water in a water tank is provided in a water ring type bottom ash conveyor device having a level switch for detecting a water level and a make-up water line with an on-off valve operated by the level switch. And a makeup water line with a ball tap valve is added to the water tank in addition to the makeup water line.
Is configured as two systems .

The present invention provides various studies based on the new finding that the temperature rise of a water-sealed conveyor does not become high because the heat is removed by the heat of vaporization if a specified amount of makeup water is used.
The result of the test. In the present invention, the supply water line is duplicated so that a predetermined amount of replenishment is performed in the water tank.

[0015]

[Function] The function of the water sealing conveyor is not different from the conventional apparatus. In the present invention, by eliminating the circulating water system (settling tank, circulating water tank, circulating pump, etc.) used in the conventional water-sealed conveyor device, the bottom ash is completely and efficiently recovered by the water-sealed conveyor. It became so. The water seal conveyor is assumed to be able to supply supply water at all times (supplement the amount reduced as evaporation and ash-adhered water).

In the present invention, the conventionally used laser
Makeup water line by attaching a makeup water line with Bell switch operation of the on-off valve with in addition to the make-up water line Bo <br/> Rutappu valve
There are two systems, and even if a failure occurs in a conventionally provided level switch or a makeup water line operated by the level switch, makeup water can be reliably supplied.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a water sealing conveyor device according to an embodiment of the present invention shown in FIG. 1 will be specifically described. In FIG. 1, the same parts as those in the conventional apparatus shown in FIG. 2 are denoted by the same reference numerals as those in FIG. 2, and the overlapping description will be omitted. In FIG. 1, reference numeral 29 denotes a makeup water line for the water tank 3 of the water sealing conveyor provided separately from the makeup water line 24, and the makeup water line 29 is provided with a ball tap valve 25. This ball tap valve 25
The supplementary water line 29 is provided to deal with a trouble of the level switch 26 and a trouble of the ON / OFF valve 22.

Reference numeral 27 denotes a valve for draining the water-sealed conveyor, which is normally closed. Reference numeral 28 denotes an overflow line from the water tank 3, and the overflow does not always flow in the overflow line 28. The overflow is supplementary in comparison with the conventional level control, and absorbs the increase in the water level due to the level fluctuation caused by the furnace pressure fluctuation. Therefore, 70 is a drainage ditch, but does not require a particularly large one.

Although the present invention has been described in detail with reference to the illustrated embodiments, the present invention is not limited to these embodiments, and the shape and structure of the present invention are within the scope of the present invention described in the appended claims. It is needless to say that various changes may be made to.

[0020]

The water-sealing conveyor device according to the present invention eliminates the need for a circulating water system conventionally attached to a water-sealing conveyor.
The operating costs and maintenance of the circulating water tank, circulating water pump, etc. are no longer required.

Further, the initial cost for producing the circulating water system becomes unnecessary, and labor and labor can be saved. In the water-sealed conveyor device according to the present invention, the furnace bottom ash can be entirely recovered by the water-sealed conveyor, and the efficiency of the auxiliary equipment can be improved in the operation of the boiler, and the power of the auxiliary equipment can be reduced.

[Brief description of the drawings]

FIG. 1 is a system diagram of a water ring type bottom ash conveyor according to one embodiment of the present invention.

FIG. 2 is a system diagram of a water ring type bottom ash conveyor to which a conventional circulating water system is attached.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Water-sealed hearth ash conveyor casing 2 Chain with scraper 3 Water-sealed hearth ash conveyor water tank 4 Water level 5 Gear 6 Drive gear 7 Water in water tank 10 Motor 11 Water-sealed hearth ash conveyor casing lower part 12 Foundation 21 Makeup water 22 ON / OFF valve 23 Bypass supply valve 24 Makeup water line 25 Ball tap valve 26 Level switch 27 Drain valve 28 Overflow 29 Makeup water line 30 Bottom ash silo 50 Inside boiler furnace 60 Furnace bottom hopper 70 Drainage groove

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23J 1/00-11/12

Claims (1)

(57) [Claims] 1. A water tank disposed below a hearth hopper and containing water for water sealing, a chain with a scraper for scraping ash in the water tank, a level switch for detecting a water level in the water tank, and In a water ring type bottom ash conveyor device having a make-up water line with an on-off valve operated by the same level switch, a make-up water line with a ball tap valve for the water tank is provided in addition to the make-up water line.
A water ring type bottom ash conveyor device comprising two systems and no circulating water system for water in the water tank.