JP3310798B2 - Rinsing equipment for regenerative heat exchangers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for washing a rotating element of a regenerative heat exchanger used in an air heater, a gas gas heater or the like during operation.

[0002]

2. Description of the Related Art Conventionally, a regenerative heat exchanger used for an air heater is provided with an annular rotating body having a plurality of heat storing elements (heat accumulating bodies), and high-temperature gas is supplied to the element at one location of the rotating body. The air is passed through and heated, and the air is passed through the element at other portions of the rotating body so that the heated element rotates and comes into contact with the air to heat the air.

In the above-mentioned conventional regenerative heat exchanger, it is necessary to perform water washing during operation. For this purpose, an injection nozzle for injecting cooling water to the element is provided. Usually, about three injection nozzles having a constant flow rate are installed at equal intervals regardless of the size of the heat exchanger.

[0004]

The rotating element of the conventional regenerative heat exchanger has a high-temperature side heated to 300 to 400 ° C. by boiler exhaust gas passing through the element. Therefore, the element itself accumulates heat and water evaporates in the initial stage of washing water injection, so that the element cannot be washed. In addition, since the regenerative heat exchanger is constantly rotating, the element is constantly moving by rotation. Therefore, the evaporation time of the washing water changes depending on the amount of the washing water from the injection nozzle, making the washing difficult.

An object of the present invention is to provide a washing apparatus for a regenerative heat exchanger which can solve the above problems.

[0006]

According to the present invention, there is provided a water washing apparatus for a regenerative heat exchanger, comprising: a cleaning nozzle for injecting cleaning water to a plurality of heat storage elements of a rotating body; And a cooling nozzle for injecting a cooling fluid to the element.

[0007]

According to the present invention, the element is first cooled by the cooling fluid injected from the cooling nozzle, and then the cleaning water is injected from the cleaning nozzle to the element. As a result, the washing water is washed in a completely water state without evaporating, and effective washing can be performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. Reference numeral 11 denotes an annular rotating body in which a number of heat storage elements 10 are radially provided at equal intervals. The rotating body 11 has a central axis arranged horizontally and rotates about the same central axis. Has become.

A horizontal gas duct 15 through which the high-temperature gas flows through the element 10 is provided at an upper portion of the rotating body 11 as shown by an arrow G. As shown, a horizontal air duct 1 in which air flows through element 10 in the opposite direction to the hot gas
6 are provided. In this regenerative heat exchanger, the element 10 heated by the high-temperature gas rotates and moves to a lower position to heat the air to perform heat exchange.
In FIG. 2, reference numeral 17 denotes a duct hopper provided below the gas duct 12.

The element 1 heated and stored by the gas duct 15 between the gas duct 15 and the air duct 16
A flushing device 1 for flushing the element 10 during operation is provided at a position where 0 moves toward the air duct 16. The water washing apparatus 1 includes a steam nozzle 9 attached to a tip of a nozzle tube 8, a plurality of cooling nozzles 3 attached to a tip of a nozzle tube 8a, and one washing nozzle 2. The nozzle tubes 8, 8a are fixed to each other by a band 8b. The nozzles 2, 3, 9 are located opposite to the element 10, and the steam nozzle is arranged from the upstream side to the downstream side in the rotation direction of the rotating body 11. 9, the cooling nozzle 3 and the cleaning nozzle 2 are arranged in this order.

The rear ends of the nozzle tubes 8, 8a are attached to a swivel shaft 7. The electric motor 4 mounted on the support member of the swivel shaft 7 includes a two-stage worm speed reducer 6b, a one-stage worm speed reducer 6a, and a link mechanism 5
The rotation of the electric motor 4 is transmitted to the swivel shaft 7 via the upper link mechanism 5 reduced by the two-stage worm speed reducer 6b and the one-stage worm speed reducer 6a. 7 is operated in the direction of arrow B in FIG. 1 with nozzle tubes 8 and 8a, and the steam nozzle 9, the cleaning nozzle 2 and the cooling nozzle 3
1 is reciprocated substantially in the radial direction, that is, in the longitudinal direction of the element 10.

High-pressure water and steam are supplied to both ends of the swivel shaft 7 through a swivel joint 13 for high-pressure water and a swivel joint 14 for steam by ON / OFF control of a solenoid valve (not shown) for a required time. Is introduced, the high-pressure water is supplied from the inside of the swivel shaft 7 through the nozzle tube 8a to the cooling nozzle 3 as cooling water,
The cleaning water is injected from the cleaning nozzle 2 as the cleaning water, and the steam is injected from the inside of the swivel shaft 7 through the nozzle tube 8 from the steam nozzle 9.

In FIG. 1, reference numeral 12 denotes a counter weight attached to the swivel shaft 7.

The number of the cooling nozzles 3 is determined as follows in accordance with the relationship between the injection flow rate from the nozzles and the evaporation time and the rotation speed of the rotating body shown in FIG.

P _n = VT / L _n (pieces) where V (m / s): the speed of the fastest part of the rotating body having the built-in element T (s): evaporation time. L _n (m): Cooling water spray width from nozzles. Determined by nozzle model. P _n : Number of cooling nozzles.

In the present embodiment, as described above, when the element 10 is washed with water during operation, steam is supplied from the steam nozzle 9, cooling water is supplied from the cooling nozzle 3, and cleaning nozzle is provided. From 2, the washing water is injected toward the element 10 that has stored heat. Since the nozzles 9, 3, and 2 are sequentially installed from the upstream side to the downstream side in the rotation direction of the rotating body 11, first, steam is injected from the steam nozzle 9 to the element 10 to remove the solvent. Next, cooling water is injected from the cooling nozzle 3 to cool the element 10,
Finally, the cleaning water is injected from the cleaning nozzle 2 to the cooled element 10. Thus, effective washing is performed while preventing evaporation of the washing water.

In addition, since the number of cooling nozzles 3 is determined based on the relationship between the injection flow rate from the nozzles and the evaporation time and the rotation speed of the rotating body 11, the number of cooling nozzles 3 All of the cooling water evaporates, whereby the element 10 is sufficiently cooled, and the washing water from the washing nozzle 2 is jetted thereon. Can be washed.

The steam injected from the steam nozzle 9 is also used for drying the element 10 immediately after washing.

In the above embodiment, the cooling water is jetted from the cooling nozzle. However, in the present invention, a cooling fluid other than water may be jetted from the cooling nozzle.

[0020]

According to the conventional regenerative heat exchanger, when the stored elements are washed only with the washing nozzle, most of the washing water is evaporated and a sufficient washing effect cannot be obtained. Since the cooling nozzle is provided on the upstream side in the rotation direction of the rotating body with respect to the cleaning nozzle, after the element is cooled, the cleaning is performed by the washing nozzle, and the element is effectively removed without evaporating the washing water. Can be washed.

[Brief description of the drawings]

FIG. 1 is a perspective view of a water washing apparatus according to an embodiment of the present invention.

FIG. 2 is an elevational view showing the washing device and a regenerative heat exchanger.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 4 is a diagram showing a relationship between an injection flow rate from a nozzle and an evaporation time obtained in a test.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water washing apparatus 2 Cleaning nozzle 3 Cooling nozzle 4 Electric motor 5 Link mechanism 6a 1-stage worm reduction gear 6b 2-stage worm reduction gear 7 Swivel shaft 8, 8a Nozzle tube 9 Steam nozzle 10 Element 11 Rotary body 12 Counterweight 13, 14 Swivel joint 15 Gas duct 16 Air duct

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F28G 1/16 F28D 19/04

Claims (1)

(57) [Claims] 1. A cooling nozzle which is provided upstream of a rotating nozzle of a rotating body in a rotating direction with respect to a washing nozzle for injecting washing water to a plurality of heat storing elements of a rotating body of a regenerative heat exchange and injects cooling fluid to the element. A washing device for a regenerative heat exchanger, comprising a nozzle.