GB2101259A - Cleaning rotating machine elements - Google Patents

Abstract

The invention relates to a device for surface cleaning of rotating machine elements through a cleaning medium supplied by a cleaning nozzle, arranged on a swinging arm 2. The element may be the heat exchange surface of a rotor part of a regenerative heat exchanger. A swinging cleaning arm 2 is by an operating member 3 adjustable at the rotor face under various angles, whereby the extreme outer position O of the cleaning arm 2 is inserted between each movement to an intermediate position a-e. <IMAGE>

Description

SPECIFICATION Device for surface cleaning of rotating machine element This invention relates for a device to surface cleaning of rotating machine element through a cleaning medium supplied with one cleaning nozzle at least, arranged on a swinging cleaning arm, especially of the heat exchange surface in a rotor part of rotating regenerative heat exchanger.

The heat exchange surfaces in rotors of regenerative heaters are during operation fouled of ash matters contained in combustion products.

Fouling of heat exchange surfaces is caused of undesirable increasing of pressure loss, of worse efficiency and results in a possibility of giving rise to a fire. Therefore the heat exchange surfaces during operation must be permanently, evtl.

periodically cleaned.

To effect cleaning, swinging blower used in time consists of a swinging blower arm with a water supply tube, with steam supply tube and with cleaning nozzles, whereby this swinging blower arm is anchored in a distributing body, rotary placed on a box of rotary regenerative heater. On frontal axis bores of the distributing body are being combined water and steam inlet piping, in lateral wall bores of the distributing body are being then fixed and sealed above mentioned supply tubes with the cleaning nozzles. Drive of the swinging blower consists of an electric motor with worm gear unit and further of a mechanical gear with a nut and a motion screw, hinge connected to the distributing body. By vapour blasting or water washing performs the swinging blower arm such a slow motion through constant angular speed along the part of circular path from rotor circuit to rotor axis and back.Under such conditions a cleaning effect of the cleaning medium, working on element of the rotor's cleaned surface is dependent on angular position of the blower arm.

This fact but has negative consequence, because time of working of blowing or sprinkling ray and thus also a cleaning effect is very different, in axial part of the rotor in comparison with circumferential parts of the rotor. On circuit is a cleaning multiple less than in axial part of the rotor. Moreover regarding the usual arrangement of combustion products' outlet conduit are the deposits as a rule created the most intensive near the circuit. If it is necessary to reach under these conditions with contemporary swinging blowers asked effect and that in the most choked circumferential parts of the rotor, it means then, that the steam energy is along major parts of the cleaning nozzles' path frustrated uselessly. Besides it comes to increasing of water vapours' content in the combustion products and to local increasing of the creation of deposits.

The present invention aims to eliminate the majority of the said disadvantages of the known device. According to the invention a swinging cleaning arm is through an operating member adjustable at rotor face under various angle, whereby extreme outer position of cleaning arm by circuit of the rotor in substance is constant, while its extreme inside positions are variable. The operating member is created like a pressure motor. In the control gear, any distributing section parallelly ranged in a distributing member, is through connecting piping connected to pressure supply, through interconnecting piping is connected to a respective pressure space of the operating member and through controlling interconnections is this distributing section combined with a controlling member.

A device according to the invention enables under operating conditions to choose an optimum blowing cycle, which allows to reduce a power consumption nearly up to objective minimum, which is necessary. This connection unables to reach and to keep practically optimum cleaning of the heat exchange surfaces also by changes of operating boiler process at changes in arrangement of deposits on the heat exchange surfaces of regenerative heater's rotor, in comparison with blowing devices known up to now, the cleaning device according to the invention is also more reliable concerning operation and less exacting concerning a maintenance.

A specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings. FIG. 1 shows a scheme of a cleaning device with swinging blower installed on a rotating regenerative heater, drawn axonometrically and FIG. 2 shows a scheme of the time development of general cleaning cycle.

As shown in FIG. 1 the cleaning device consists of a swinging blower with operating member 3, arranged on a part of box of the regenerative heater, and of a block shown controlling gear 18, which is combined with this operating member 3 through interconnecting piping 13. The distributing member 9 which is by controlling gear 1 8 connected to hydraulic pressure supply 8 through the connecting piping 11, consists of four parallelly ranged distributing sections, any of which is through interconnecting piping 13 connected to that respective of two pressure space of operating member 3 and through electric controlling interconnection 12 is connected to an electric controlling member 10.In drawing the operating member 3 is shown as a two-way hydraulic pressure cylinder and as distributing sections here are four parallelly ranged selfcontained three-position hydraulic distributors with auxiliary electric servomotors, any of which is electrically interconnected to respective outlet of the controlling member 10. Through interconnecting piping 13 any of hydraulic distributors is connected to the respective outlet of four two-way hydraulic operating member 3, only one of which is shown in FIG. 1.

Any of outlet of the controlling member 10, which is fitted with known time switching elements they are not shown, further fitted with step-by-step selectors and with auxiliary electric controllers, is connected through the electric control interconnection 12 connected to the respective electric servomotor of the hydraulic distributor. Inlet of the controlling member 10 is connected to an electric supply, which is not shown. Electric control interconnection 1 2 between the control member 10 and the distributing member 9 are created like an electric multi-cable conductor.

According to FIG. 1 is from left the first distributing section of the distributing member 9 connected to the upper, illustrated operating member 3, which is through a hinged holder 1 4 swinging placed on a box 1 of regenerative heater.

the second distributing section of the distributing member 9 is connected to the lower, unillustrated operating member 3, which is on the box 1 of regenerative heater placed regarding the upper illustrated member 3, specularly symmetrically according to horizontal plane. The third and the fourth distributing section of distributing member 9 are combined with the second unillustrated regenerative heater, so that the controlling gear 1 8 which is drawn, may control cleaning of the heat exchange surfaces of two regenerative heaters.

On upper and also on lower base of the box 1 of each of the both regenerative heaters is being fixed a cross beam 6 with centrally placed bearing 7 for two-sided clamping and rotary placing of the rotor 1 6 which is directed vertically. A driving gear of the rotor 1 6 of regenerative heater is not shown in FIG. 1.

In arrangement which is described, is with any face of both rotors 1 6 installed one swinging blower, on cleaning arm 2 of which is on the first end fixed unillustrated cleaning nozzle pointing in substance normally towards the rotor face; Outer end of a piston rod 4 of any hydraulic operating member 3 is swinyingly clamped to the first end of control lever 5, which is through its second end attached to a distributing body 1 5, whereby to this distributing body 1 5 is through the second end attached the cleaning arm 2. FIG. 1 shows the swinging arm 2 over the upper face of the rotor 1 6 in outlet. resp. outer position 0 on circuit o-F the rotor 1 6.

Before the cleaning process in controlling member 10, time dwells set up on time switching elements and on step-by-step selectors determinates the lengths of piston travel in hydraulic operating members 3 and thus also individual inside position a. X, c, d, e of the cleaning nozzles on the upper and under the lower faces of the rotating rotors 1 6. When starting the cleaning process moves any cleaning arm 2 with cleaning nozzles on order of the controlling member 10 according to FIG. 2 from outer position 0 along an arc railway 1 7 into the first inside position a.After reaching this first inside position a are on order of the controlling member 10 displaced hydraulic gate valve in distributing sections of the distributing member 9 and a free end of the cleaning arm 2 returns along the arc railway 1 7 into the starting position 0, after which are on further order of the controlling member 10 displaced the hydraulic gate valves in distributing member 9 into opposite position and the cleaning arm 2 moves from outer position 0 into the second inside position b. To further orders of the controlling member 10 deflects gradually the cleaning arm 2 to the next inside position c, d, e.

From a final inside position e is after return of the cleaning arm 2 to outer position 0 its movement and thus also the whole cleaning process finished, During cleaning process is the cleaning cycle on respective face of the rotor 1 6 several time repeated and that in above mentioned order 0, a, O, b, O, c, O, d, O, e, O. Swinging motion of the cleaning arm 2 passing in substance parallelly with the face of any rotor 16, is thus in every cleaning cycle of the cleaning process amplitude modulated, whereby the extreme outer position 0 of the cleaning arm 2 on circuit is in the main constant, while its extreme positions a, b, c, d, e are during the cleaning process periodically variable. Time behaviour of any cleaning cycle including the time dweils in extreme positions of the cleaning arm 2 with the cleaning nozzles on any of rotor faces, as well as an order of cleaning of single rotor faces and a number of the cleaning cycle in cleaning process is possible to set in the controlling member 10, when required.

Claims (4)

1. A device for surface cleaning of rotating machine element through cleaning medium supplied with one cleaning nozzle at least, arranged on swinging cleaning arm, which is kinematically combined with operating member, connected to controlling gear, especially to cleaning of heat exchange surfaces in a rotor part of rotating regenerative heat exchanger, rotarily arranged in a part of box of that heat exchanger.

wherein the swinging cleaning arm 2 is through an operating member 3 adjustable by the rotor's face 1 6 under various angle, whereby extreme outer position 0 of cleaning arm 2 on circuit of the rotor in substance is constant. while extreme inside positions (a,b,c,d,e) are variable.

2. A device for surface cleaning as claimed in claim 1, wherein the operating member 3 is created like a pressure motor.

3. A device for surface cleaning as claimed in ciaim 1, wherein in controlling gear 18 any distributing section parallelly ranged in the distributing member. is through connecting piping connected to pressure supply through interconnecting piping is connected to a respective pressure space of tre operating member 3 and through controlling interconnections 12 is this distributing section combined with a controlling member 10.

4. A device for surface cleaning of a rotating machine element substantially as described with reference to the accompanying drawings.