On-line measuring device for alkali metal concentration in flue gas of coal-fired boiler

Abstract

The utility model discloses a coal-fired boiler flue gas alkali metal concentration on-line measuring device, and belongs to the technical field of alkali metal measurement. The device comprises a flue gas sampling device, a flue gas pretreatment device and a flue gas analysis device, wherein the flue gas sampling device, the flue gas pretreatment device and the flue gas analysis device are communicated with one another through connecting pipes; the gear drives the toothed plate to move, the toothed plate drives the push rod to move through the connecting rod, the push rod drives the piston to move, the piston sucks smoke into the barrel, then the piston extrudes the smoke to be discharged from the one-way valve, in this way, it can be avoided that sampling needs to be carried out in advance for detection, and therefore the purpose of improving efficiency is achieved; the plugging disc is driven by air pressure to rotate along the second rotating shaft, so that the annular plate is opened by the plugging disc, the plugging disc is driven to reset through piston resetting and elastic force of the torsional spring, and the annular plate is plugged by the plugging disc, so that inconvenience in controlling opening and closing of the barrel can be avoided, and the purpose of convenient plugging is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to alkali metal measurement technical field, concretely is a kind of coal-fired boiler flue gas alkali metal concentration on-line measuring device. BACKGROUND

[0002] During the fuel combustion or gasification process of coal-fired boiler, potassium and sodium elements will quickly evaporate in gas phase and transfer to flue gas, and potassium and sodium alkali metal salts will adhere to the surface of heat exchanger during flue gas cooling process, causing heat exchange surface contamination, which will cause serious corrosion of heat exchanger and greatly reduce the heat exchange efficiency of heat exchanger, and the monitoring technology of alkali metal in flue gas is of great significance for the operation and detection of actual combustion equipment.

[0003] The existing concentration measurement of alkali metal is currently mostly based on flame / graphite furnace atomic absorption spectrometry, laser-induced breakdown spectroscopy, inductively coupled plasma atomic emission spectrometry and other analysis methods, but these methods are mainly used for offline testing, and the collected samples need to be extracted in advance, which cannot be effectively applied to online testing. UTILITY MODEL CONTENT

[0004] In order to solve the problem of not being able to effectively test online by extracting samples in advance, the purpose of the utility model is to provide a coal-fired boiler flue gas alkali metal concentration on-line measuring device.

[0005] The utility model discloses a kind of online measurement devices for concentration of alkali metal in flue gas of coal-fired boiler, including flue gas sampling device, flue gas pretreatment device and flue gas analysis device, and the flue gas sampling device, flue gas pretreatment device and flue gas analysis device are communicated by connecting pipe, the flue gas sampling device includes cylinder, piston is slidably arranged in the inside of the cylinder, the middle part of the piston is fixed with push rod, the end of the push rod away from the piston is movably penetrated into one end of cylinder, the end of the push rod away from the piston is fixed with connecting rod, the top of the connecting rod is fixed with gear plate, the outside of the gear plate is engaged with gear, the middle part of the gear is fixed with first rotation shaft, the inside of the cylinder is provided with plugging assembly, rotate gear by first rotation shaft, gear drives gear plate to move, gear plate drives push rod to move by connecting rod, push rod drives piston to move, so that piston inhales flue gas into cylinder, then flue gas is discharged by piston extrusion, flue gas enters flue gas pretreatment device for processing by connecting pipe, then detects and analyzes treated flue gas by flue gas analysis device, and then the concentration of alkali metal is detected, so that it can avoid the need for early sampling detection more cumbersome, the outside of the cylinder is fixed with fixed block of symmetrical distribution, the side of the fixed block close to gear plate is provided with guide slot, the side of the gear plate close to fixed block is fixed with guide rod, the guide rod is slidably clamped in guide slot, gear plate can be kept stable by moving guide rod in guide slot, the end of the cylinder close to piston is fixed with mounting plate, the outside of the mounting plate is provided with mounting hole of rectangular array distribution, mounting plate can be conveniently fixed and installed on flue gas pipeline by mounting hole, and then cylinder is installed, the outside of the cylinder is provided with motor, the end of motor output shaft is fixedly connected with the top of first rotation shaft, one end of the cylinder is fixed with support plate, the top of first rotation shaft is rotatably installed on the inside of support plate, motor is fixedly installed on the top of support plate, motor can provide power for first rotation shaft rotation by motor, motor and first rotation shaft can be conveniently installed by support plate, one end of the cylinder is fixedly penetrated with one-way valve, one-way valve is communicated with flue gas pretreatment device by connecting pipe, gas backflow can be avoided by one-way valve, the side of the mounting plate is fixed with sealing gasket, the sealing property between mounting plate and flue gas pipeline can be improved by sealing gasket.

[0006] Preferably, the plugging assembly comprises an annular plate and a plugging disc, the annular plate is fixedly installed at the opening of the cylinder body, the plugging disc is located at the side of the annular plate close to the piston, a groove is formed in the top end of the plugging disc, a second rotating shaft is rotatably installed in the groove, a connecting block is fixedly sleeved on the outer side of the second rotating shaft, the top end of the connecting block is fixedly connected with the inner wall of the cylinder body, and symmetrical torsional springs are movably sleeved on the outer side of the second rotating shaft, the two ends of the torsional springs are fixedly connected with the inner wall of the groove and the outer side of the connecting block respectively.

[0007] Compared with the prior art, the utility model has the advantages that:

[0008] 1, through gear drive tooth board moves, tooth board moves through connecting rod drive push rod, push rod drive piston moves, make piston inhale the flue gas into the cylinder body, again through piston extrude flue gas from check valve and discharge, so can avoid the need to take sample in advance and detect more cumbersome, so as to reach the purpose of improving efficiency;

[0009] 2, through air pressure drive plugging disc along second rotating shaft rotation, make plugging disc open annular plate, through piston reset, torsional spring elastic force drive plugging disc reset, plugging disc is sealed to annular plate, so can avoid the inconvenience control open and close cylinder body, so as to reach the purpose of convenient plugging. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0011] Fig. 1 The structure of the present application is shown in the figure.

[0012] Fig. 2 The structure of the present application is shown in the figure.

[0013] Fig. 3 The structure of the present application is shown in the figure.

[0014] In the figure: 1, flue gas sampling device; 11, cylinder; 12, piston; 13, push rod; 14, connecting rod; 15, toothed plate; 16, gear; 17, plugging assembly; 171, annular plate; 172, plugging disc; 173, groove; 174, second rotating shaft; 175, connecting block; 176, torsional spring; 177, sealing ring; 18, first rotating shaft; 19, motor; 110, fixed block; 111, guide groove; 112, guide rod; 113, one-way valve; 114, sealing gasket; 115, support plate; 116, mounting plate; 117, mounting hole; 2, flue gas pretreatment device; 3, flue gas analysis device. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0016] Embodiment: as Figs. 1-3As shown, this utility model provides an online measurement device for alkali metal concentration in flue gas of a coal-fired boiler, including a flue gas sampling device 1, a flue gas pretreatment device 2, and a flue gas analysis device 3. The flue gas sampling device 1, the flue gas pretreatment device 2, and the flue gas analysis device 3 are connected by a connecting pipe. The flue gas analysis device 3 is connected to an external data acquisition and transmission device and a coal-fired boiler control system, and is used to collect and analyze the results and transmit the collected analysis results to the coal-fired boiler control system after processing. The flue gas sampling device 1 includes a cylinder 11, and a piston 12 is slidably arranged inside the cylinder 11. A push rod 13 is fixedly arranged in the middle of the piston 12. The end of the push rod 13 away from the piston 12 moves through one end of the cylinder 11, and the end of the push rod 13 away from the piston 12 is fixed. A connecting rod 14 is fixedly provided, and a toothed plate 15 is fixedly provided at the top of the connecting rod 14. A gear 16 meshes with the outer side of the toothed plate 15, and a first rotating shaft 18 is fixedly provided in the middle of the gear 16. A sealing assembly 17 is provided inside the cylinder 11. The first rotating shaft 18 drives the gear 16 to rotate, and the gear 16 drives the toothed plate 15 to move. The toothed plate 15 drives the push rod 13 to move through the connecting rod 14, and the push rod 13 drives the piston 12 to move, so that the piston 12 draws the flue gas into the cylinder 11, and then the piston 12 squeezes the flue gas out. The flue gas enters the flue gas pretreatment device 2 through the connecting pipe for treatment, and then the flue gas analysis device 3 detects and analyzes the treated flue gas, and then detects the concentration of alkali metals. This can avoid the need for pre-sampling. The inspection is relatively complicated. Symmetrically distributed fixing blocks 110 are fixed to the outer side of the cylinder 11. A guide groove 111 is opened on the side of the fixing block 110 near the toothed plate 15. A guide rod 112 is fixed to the side of the toothed plate 15 near the fixing block 110. The guide rod 112 is slidably engaged in the guide groove 111. The movement of the guide rod 112 within the guide groove 111 keeps the toothed plate 15 moving stably. A mounting plate 116 is fixed to the end of the cylinder 11 near the piston 12. Mounting holes 117 arranged in a rectangular array are opened on the outer side of the mounting plate 116. The mounting plate 116 can be easily fixed to the flue gas duct through the mounting holes 117, thus installing the cylinder 11. A motor 19 is installed on the outer side of the cylinder 11. The end of the output shaft 19 is fixedly connected to the top of the first rotating shaft 18. A support plate 115 is fixedly provided at one end of the cylinder 11. The top of the first rotating shaft 18 is rotatably installed on the inner side of the support plate 115. The motor 19 is fixedly installed on the top of the support plate 115. The motor 19 can provide power for the rotation of the first rotating shaft 18. The support plate 115 can facilitate the installation of the motor 19 and the first rotating shaft 18. A one-way valve 113 is fixedly passed through one end of the cylinder 11. The one-way valve 113 is connected to the flue gas pretreatment device 2 through a connecting pipe. The one-way valve 113 can prevent gas backflow. A sealing gasket 114 is fixedly provided on one side of the mounting plate 116. The sealing gasket 114 can improve the sealing between the mounting plate 116 and the flue gas pipe.

[0017] The blocking assembly 17 comprises an annular plate 171 fixedly installed at the opening of the cylinder body 11 and a blocking disc 172 located at one side of the annular plate 171 close to the piston 12, a groove 173 is formed at the top end of the blocking disc 172, a second rotating shaft 174 is rotatably installed in the groove 173, a connecting block 175 is fixedly sleeved on the outer side of the second rotating shaft 174, the top end of the connecting block 175 is fixedly connected with the inner wall of the cylinder body 11, and symmetrical torsional springs 176 are movably sleeved on the outer side of the second rotating shaft 174, the two ends of each torsional spring 176 are fixedly connected with the inner wall of the groove 173 and the outer side of the connecting block 175 respectively, the blocking disc 172 is driven to rotate along the second rotating shaft 174 by the gas pressure, so that the annular plate 171 is opened by the blocking disc 172, the piston 12 is reset, the blocking disc 172 is reset by the elastic force of the torsional springs 176, and the annular plate 171 is blocked by the blocking disc 172, so that the cylinder body 11 can be conveniently controlled to open and close, and the sealing performance of the annular plate 171 and the blocking disc 172 is improved by the sealing ring 177 fixedly arranged at one side of the blocking disc 172 close to the annular plate 171.

[0018] Working principle: first, the mounting plate 116 is fixedly installed on the flue gas pipeline through the screw rod penetrating the mounting hole 117, and then the cylinder body 11 is installed, when it is necessary to collect flue gas, the motor 19 is started to drive the motor 19 to work, the end of the output shaft of the motor 19 drives the first rotating shaft 18 to rotate, the first rotating shaft 18 drives the gear 16 to rotate, the gear 16 drives the toothed plate 15 to move, the toothed plate 15 moves stably in the guide groove 111 through the guide rod 112, the toothed plate 15 drives the push rod 13 to move through the connecting rod 14, the push rod 13 drives the piston 12 to move, the piston 12 drives the blocking disc 172 to rotate along the second rotating shaft 174 through the gas pressure, one end of the torsional spring 176 is driven by the blocking disc 172, the elastic force of the torsional spring 176 is generated, the annular plate 171 is opened by the blocking disc 172, the piston 12 sucks the flue gas into the cylinder body 11, the motor 19 is reversed to reset the piston 12, the elastic force of the torsional spring 176 drives the blocking disc 172 to reset, the annular plate 171 is blocked by the blocking disc 172, the sealing performance of the annular plate 171 and the blocking disc 172 is improved by the sealing ring 177, the piston 12 extrudes the flue gas to discharge from the one-way valve 113, the flue gas enters the flue gas pretreatment device 2 for treatment through the connecting pipe, the treated flue gas is detected and analyzed by the flue gas analysis device 3, the concentration of alkali metal is detected, the analysis data is collected by the external data acquisition device and sent to the coal-fired boiler control system, so that the flue gas can be detected by taking samples in advance, the detection is more complicated, and the efficiency is improved.

[0019] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application also intends to include these modifications and variations.

Claims

1. An online measurement device for alkali metal concentration in flue gas from a coal-fired boiler, comprising a flue gas sampling device (1), a flue gas pretreatment device (2), and a flue gas analysis device (3), characterized in that: The flue gas sampling device (1), the flue gas pretreatment device (2), and the flue gas analysis device (3) are connected by a connecting pipe. The flue gas sampling device (1) includes a cylinder (11). A piston (12) is slidably arranged inside the cylinder (11). A push rod (13) is fixedly arranged in the middle of the piston (12). The end of the push rod (13) away from the piston (12) moves through one end of the cylinder (11). A connecting rod (14) is fixedly arranged in the end of the push rod (13) away from the piston (12). A toothed plate (15) is fixedly arranged at the top of the connecting rod (14). A gear (16) meshes with the outside of the toothed plate (15). A first rotating shaft (18) is fixedly arranged in the middle of the gear (16). A sealing assembly (17) is arranged inside the cylinder (11).

2. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 1, characterized in that, The sealing assembly (17) includes an annular plate (171) and a sealing disc (172). The annular plate (171) is fixedly installed at the opening of the cylinder (11). The sealing disc (172) is located on the side of the annular plate (171) near the piston (12). A groove (173) is provided at the top of the sealing disc (172). A second rotating shaft (174) is rotatably installed inside the groove (173). A connecting block (175) is fixedly sleeved on the outside of the second rotating shaft (174). The top of the connecting block (175) is fixedly connected to the inner wall of the cylinder (11). Symmetrically distributed torsion springs (176) are movably sleeved on the outside of the second rotating shaft (174). The two ends of the torsion springs (176) are fixedly connected to the inner wall of the groove (173) and the outside of the connecting block (175), respectively.

3. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 1, characterized in that, The outer side of the cylinder (11) is fixed with symmetrically distributed fixing blocks (110). The fixing blocks (110) have guide grooves (111) on the side near the toothed plate (15). The toothed plate (15) has guide rods (112) fixed on the side near the fixing blocks (110). The guide rods (112) are slidably locked in the guide grooves (111).

4. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 1, characterized in that, The cylinder (11) is fixedly provided with a mounting plate (116) at one end near the piston (12), and the mounting plate (116) has mounting holes (117) arranged in a rectangular array on the outer side.

5. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 1, characterized in that, A motor (19) is provided on the outside of the cylinder (11). The end of the output shaft of the motor (19) is fixedly connected to the top of the first rotating shaft (18). A support plate (115) is fixedly provided at one end of the cylinder (11). The top of the first rotating shaft (18) is rotatably installed on the inside of the support plate (115). The motor (19) is fixedly installed on the top of the support plate (115).

6. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 1, characterized in that, One end of the cylinder (11) is fixedly connected to a one-way valve (113), which is connected to the flue gas pretreatment device (2) through a connecting pipe.

7. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 2, characterized in that, A sealing ring (177) is fixedly provided on the side of the sealing disc (172) near the annular plate (171).

8. The online measurement device for alkali metal concentration in flue gas of a coal-fired boiler as described in claim 4, characterized in that, A sealing gasket (114) is fixedly provided on one side of the mounting plate (116).

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