Concentrated solution back-spraying device of selective non-catalytic reduction (SNCR) system

Abstract

The utility model relates to a concentrated solution back-spraying device of an SNCR (selective non-catalytic reduction) system, which comprises a collecting tank, a filter mechanism is mounted on one side of the collecting tank, an injection pump and an injector are sequentially arranged on the other side of the collecting tank, the injector is connected with an incinerator, and the filter mechanism comprises a filter screen mounted on the upper side of the collecting tank. The installation edge is connected to the edge of the filter screen and is erected upwards, a driving air cylinder is installed on the outer side of the installation edge, the driving air cylinder is provided with a piston rod in matched linkage, the piston rod extends along the top edge of one side of the installation edge and is connected with a supporting rod located on the inner side of the installation edge, and the supporting rod is connected with a horizontal corrugated rod. The corrugated rod is attached to the top surface of the filter screen; after back spraying is finished, the driving air cylinder is started, the piston rod is driven to stretch out and draw back in a reciprocating mode, the corrugated rod connected with the piston rod is driven to move, sludge blocks are pushed to be peeled off from the filter screen, dried sludge cannot be firmly attached to the filter screen, and sludge and impurities left after filtering can be cleared away in a more labor-saving mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the garbage incineration technical field, especially to a SNCR system concentrated liquid back spraying device. BACKGROUND

[0002] Urea is often used as a denitration reducing agent in a garbage incineration plant, and the leachate in the denitration process usually adopts the NF+RO process, which can produce concentrated liquid. In order to reduce the pollution of the concentrated liquid to the environment, some incineration power plants use the concentrated liquid for fly ash solidification and lime slurry preparation, but it is difficult to completely absorb all the concentrated liquid. The SNCR system uses the leachate concentrated liquid as a diluent liquid to be sprayed into the furnace for high-temperature oxidation treatment, which is an effective supplementary method. The existing back spraying device avoids the situation that the sludge and impurities in the concentrated liquid block the spray port during the process of spraying the concentrated liquid into the incinerator. A filter screen is installed on the collection tank to collect the concentrated liquid from which the sludge and impurities are filtered in the collection tank, and then the concentrated liquid is sprayed into the furnace from the collection tank. However, the sludge and impurities are easy to form a group on the filter screen, and after drying, they are attached to the filter screen. It is more laborious to remove the sludge, and when filtering the concentrated liquid next time, it forms a blockage, which reduces the speed of the concentrated liquid flowing into the collection tank. Therefore, it is urgent to design a SNCR system concentrated liquid back spraying device which can avoid the attachment and blockage of the filtered sludge and maintain the filtering efficiency of the concentrated liquid. SUMMARY

[0003] The present application provides a SNCR system concentrated liquid back spraying device to solve the above problems.

[0004] The technical scheme of the present application is a SNCR system concentrated liquid back spraying device, which comprises a collection tank, a filter mechanism is installed on one side of the collection tank, a spray pump and a sprayer are sequentially arranged on the other side of the collection tank, the sprayer is connected with an incinerator, the filter mechanism comprises a filter screen installed on the upper side of the collection tank, and a mounting rail vertically upwardly connected with the edge of the filter screen, a driving cylinder is installed on the outer side of the mounting rail, the driving cylinder is provided with a piston rod in cooperation with a linkage, the piston rod extends along the top edge of one side of the mounting rail, the piston rod is connected with a support rod located on the inner side of the mounting rail, the support rod is connected with a horizontal corrugated rod, and the corrugated rod is in close contact with the top surface of the filter screen.

[0005] After the structure is used, the concentrated liquid is treated by the filtering mechanism, the sludge and impurities are filtered by the filter screen installed on the upper side of the collecting pool, the concentrated liquid flows into the collecting pool, and then is sprayed into the furnace by the jet pump and the injector for high-temperature oxidation treatment; after the spraying is finished, the driving cylinder is immediately started to drive the piston rod to reciprocate, the piston rod drives the supporting rod and the corrugated rod to move horizontally above the filter screen, the corrugated rod is attached to the top surface of the filter screen, and the sludge clumps attached to the filter screen are extruded in the moving process of the corrugated rod, so that the sludge and impurities are peeled off from the filter screen, and the peeled sludge and impurities are more easily cleaned from the filtering mechanism; the driving cylinder is immediately started after the spraying is finished to drive the piston rod to reciprocate, drive the connected corrugated rod to move, and push the sludge clumps to peel off from the filter screen, so that the sludge is not firmly attached to the filter screen after being dried, and the sludge and impurities left on the filter screen can be more easily cleaned.

[0006] As a further improvement of the utility model, the lower part of the filter screen is provided with a motor-driven closing valve plate, and the filtering mechanism further comprises a water tank and a cleaning nozzle, the water tank is fixed to the side of the collecting pool, the water tank is provided with a water pump, the cleaning nozzle is connected to the inner side of the mounting ridge, and the water outlet end of the water pump is provided with a water delivery pipe connected to the cleaning nozzle.

[0007] After the above structure is used, the motor is started to close the collecting pool by the closing valve plate after the sludge and impurities are peeled off by the corrugated rod, so that water above the filter screen cannot flow into the collecting pool; the water pump on the water tank is started to press the water in the water tank into the water delivery pipe, and the water is sprayed from the cleaning nozzle to the inside of the mounting ridge through the water delivery pipe, so that the filter screen is washed; the position of the blow-off valve matches the water outlet direction of the cleaning nozzle, so that the sludge and impurities can be washed to the blow-off port by the water flow, the blow-off valve is opened at the same time, the sludge and impurities flow through the blow-off valve along the water flow to the outside of the mounting ridge to complete the cleaning, and the step of manually cleaning the sludge and impurities on the filter screen is further saved, so that the filtering mechanism is more convenient to clean.

[0008] As a further improvement of the utility model, the end of the piston rod is connected with a sliding seat, the bottom of the sliding seat is provided with a clamping groove, the top of the mounting ridge is inserted into the clamping groove, and the supporting rod is connected to the sliding seat.

[0009] After the above structure is used, the top of the mounting ridge is inserted into the clamping groove, so that the piston rod pushes and pulls the sliding seat when the piston rod is extended and retracted, the sliding seat is clamped on the mounting ridge and slides, the end of the piston rod is supported, and the transmission is completed by the supporting rod connected to the sliding seat, so that the stability of the piston rod when being extended and retracted is improved.

[0010] As a further improvement of the utility model, the inner wall of the clamping groove is embedded with a freely rotating ball bearing, and the ball bearing is attached to the mounting ridge.

[0011] After the above structure, the inner wall of the clamping groove is embedded with the freely rotating ball, the ball is matched with the installation edge, when the sliding seat moves on the installation edge, the ball rotates to reduce the friction between the clamping groove and the installation edge, so that the sliding seat moves more smoothly.

[0012] As a further improvement of the utility model, the outer side of the driving cylinder is provided with a water-proof cover, and the water-proof cover is provided with a through hole through which the piston rod passes.

[0013] After the above structure, the water-proof cover is arranged on the outer side of the driving cylinder to avoid that the concentrated liquid flowing into the collecting pool splashes on the driving cylinder to cause damage; the through hole through which the piston rod passes is arranged on the water-proof cover to avoid interference to the extension and retraction of the piston rod. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the structural schematic diagram of the utility model.

[0015] Fig. 2 It is the structural schematic diagram of the filtering mechanism.

[0016] Fig. 3 It is the structural schematic diagram of the sliding seat of A part.

[0017] 1-collecting pool, 2-jet pump, 3-ejector, 4-filter screen, 5-installation edge, 6-driving cylinder, 7-piston rod, 8-supporting rod, 9-corrugated rod, 10-water tank, 11-cleaning nozzle, 12-water pump, 13-water delivery pipe, 14-drainage valve, 15-sliding seat, 16-clamping groove, 17-water-proof cover. DETAILED DESCRIPTION

[0018] As Figs. 1-3 shown, a SNCR system concentrated liquid back spraying device, including collecting pool 1, one side of the collecting pool 1 is provided with filtering mechanism, the other side is sequentially provided with jet pump 2 and ejector 3, the ejector 3 is connected with incinerator, the filtering mechanism includes filter screen 4 installed on the upper side of collecting pool 1, and installation edge 5 connected to the edge of filter screen 4 and vertically upward, the outer side of the installation edge 5 is provided with driving cylinder 6, the driving cylinder 6 is provided with piston rod 7 in cooperation, the piston rod 7 extends along the top edge of one side of installation edge 5, the piston rod 7 is connected with supporting rod 8 located in the inner side of installation edge 5, the supporting rod 8 is connected with horizontal corrugated rod 9, the corrugated rod 9 is matched with the top surface of filter screen 4.

[0019] The concentrated liquid is treated by the filtering mechanism, the sludge and impurities are filtered by the filter screen 4 installed on the upper side of the collecting pool 1, and then the concentrated liquid flows into the collecting pool 1 and is sprayed into the furnace by the jet pump 2 and the sprayer 3 for high-temperature oxidation treatment; after the spraying is completed, the driving cylinder 6 is immediately started to drive the piston rod 7 to reciprocatingly extend and retract, the piston rod 7 drives the supporting rod 8 and the corrugated rod 9 to horizontally reciprocate above the filter screen 4, the corrugated rod 9 is attached to the top surface of the filter screen 4, and the corrugated rod 9 extrudes the sludge lumps attached to the filter screen 4 during the movement to strip the sludge and impurities from the filter screen 4, and the sludge and impurities stripped are more easily cleaned from the filtering mechanism; the driving cylinder 6 is immediately started after the spraying is completed to drive the piston rod 7 to reciprocatingly extend and retract, drive the connected corrugated rod 9 to move, and strip the sludge lumps from the filter screen 4, so that the sludge is not firmly attached to the filter screen 4 after drying and can be more easily cleaned.

[0020] A motor-driven closing valve plate is installed below the filter screen 4, the filtering mechanism further comprises a water tank 10 and a cleaning nozzle 11, the water tank 10 is fixed to the side of the collecting pool 1, the water tank 10 is provided with a water pump 12, the cleaning nozzle 11 is connected to the inner side of the installation ridge 5, and the water outlet end of the water pump 12 is provided with a water delivery pipe 13 connected to the cleaning nozzle 11 through the installation ridge 5; the installation ridge 5 is further provided with a sewage valve 14, and the position of the sewage valve 14 matches the water outlet direction of the cleaning nozzle 11.

[0021] After the corrugated rod 9 strips the sludge and impurities, the motor is started to close the collecting pool 1 by the closing valve plate, so that the water above the filter screen 4 cannot enter the collecting pool 1; the water pump 12 on the water tank 10 is started to press the water in the water tank 10 into the water delivery pipe 13, and the water is sprayed from the cleaning nozzle 11 to the inside of the installation ridge 5 through the water delivery pipe 13 to flush the filter screen 4; the position of the sewage valve 14 matches the water outlet direction of the cleaning nozzle 11, so that the sludge and impurities can be flushed to the sewage outlet by the water flow, and the sludge and impurities are cleaned by passing through the sewage valve 14 to the outside of the installation ridge 5 along the water flow, further eliminating the step of manually cleaning the sludge and impurities on the filter screen 4, and making the cleaning of the filtering mechanism more convenient.

[0022] The end of the piston rod 7 is connected with a sliding seat 15, the bottom of the sliding seat 15 is provided with a clamping groove 16, the top of the installation ridge 5 is inserted into the clamping groove 16, and the supporting rod 8 is connected to the sliding seat 15.

[0023] The top of the installation ridge 5 is inserted into the clamping groove 16, so that the piston rod 7 pushes and pulls the sliding seat 15 during extension and retraction, the sliding seat 15 is clamped on the installation ridge 5 to slide and support the end of the piston rod 7, and the supporting rod 8 is connected to the sliding seat 15 to complete transmission, thereby improving the stability of the piston rod 7 during extension and retraction.

[0024] The inner wall of the clamping groove 16 is embedded with freely rotating balls which are in contact with the installation edge 5.

[0025] The inner wall of the clamping groove 16 is embedded with freely rotating balls which are in contact with the installation edge 5.

[0026] The outer side of the driving cylinder 6 is provided with a water-proof cover 17 which is provided with a through hole for the piston rod 7 to pass through.

[0027] The outer side of the driving cylinder 6 is provided with a water-proof cover 17 which is provided with a through hole for the piston rod 7 to pass through.

Claims

1. A SNCR system concentrate liquid back spraying device, comprising a collection pool (1), one side of the collection pool (1) is provided with a filtering mechanism, the other side is sequentially provided with a jet pump (2) and a sprayer (3), the sprayer (3) is connected with an incinerator, characterized in that: The filter mechanism comprises a filter screen (4) installed on the upper side of the collecting pool (1), and a mounting edge (5) connected to the edge of the filter screen (4) and vertically erected upward, the outer side of the mounting edge (5) is provided with a driving cylinder (6), the driving cylinder (6) is provided with a piston rod (7) in cooperation with linkage, the piston rod (7) extends along the top edge of one side of the mounting edge (5), the piston rod (7) is connected with a support rod (8) located on the inner side of the mounting edge (5), the support rod (8) is connected with a horizontal corrugated rod (9) which is in close contact with the top surface of the filter screen (4).

2. The SNCR system concentrate blowdown apparatus of claim 1, wherein: A motor-driven opening and closing valve plate is installed below the filter screen (4), the filter mechanism further comprises a water tank (10) and a cleaning nozzle (11), the water tank (10) is fixed on the side of the collecting pool (1), the water tank (10) is provided with a water pump (12), the cleaning nozzle (11) is connected to the inner side of the mounting edge (5), the water outlet end of the water pump (12) is provided with a water delivery pipe (13) which passes through the mounting edge (5) and is connected to the cleaning nozzle (11); the mounting edge (5) is further provided with a sewage valve (14) which is matched with the water outlet direction of the cleaning nozzle (11).

3. The SNCR system concentrate blowdown apparatus of claim 1, wherein: The end of the piston rod (7) is connected with a sliding seat (15), the bottom of the sliding seat (15) is provided with a clamping groove (16), the top of the mounting edge (5) is inserted into the clamping groove (16), and the support rod (8) is connected to the sliding seat (15).

4. The SNCR system concentrate blowdown apparatus of claim 3, wherein: The inner wall of the clamping groove (16) is embedded with freely rotating balls which are in close contact with the mounting edge (5).

5. The SNCR system concentrate blowdown apparatus of claim 1, wherein: The outer side of the driving cylinder (6) is provided with a water-proof cover (17) which is provided with a through hole for the piston rod (7) to pass through.

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