Wet desulphurization circulating pump energy-saving control device

Abstract

The utility model provides an energy-saving control device for a wet desulphurization circulating pump, which relates to the technical field of flue gas treatment and comprises a circulating pump control mechanism, and the circulating pump control mechanism comprises an absorption tower, a feeding pipe, a discharging pipe, a connecting pipe, a circulating pipe and a slurry tank. According to the utility model, the controller receives data from various sensors, outputs control signals according to a pre-programmed control strategy, adjusts the output frequency of the frequency converter of the variable-frequency circulating pump, controls the rotating speed of the motor of the circulating pump, and can dynamically adjust the operation of the variable-frequency circulating pump according to actual working conditions; energy waste of a traditional constant-speed circulating pump under the low-load working condition is avoided, the stirring mechanism is arranged to crush solid impurities and sediments sliding onto the filter screen, the solid impurities and the sediments can be conveniently discharged outwards through the discharging pipe, and the working efficiency is improved. Meanwhile, pipeline blockage caused by the fact that sediments are sucked into an inlet pipeline of the variable-frequency circulating pump can be avoided, and the problems of cavitation, vibration and the like of the variable-frequency circulating pump are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to flue gas treatment technical field especially, relate to a kind of wet desulphurization circulating pump energy-saving control device. BACKGROUND

[0002] Wet desulphurization circulating pump energy-saving control device is a kind of applied in wet desulphurization system, for controlling circulating pump operation, to reach the equipment of energy-saving purpose, in wet desulphurization process, circulating pump is key equipment, it is responsible for the desulfurization slurry in absorption tower circulation delivery, make flue gas and slurry fully contact, thereby remove sulfur dioxide in flue gas.

[0003] As Chinese patent CN216093072U discloses "a kind of wet desulphurization circulating pump energy-saving control device", including absorption tower, import and export CEMS, DCS system control equipment, spray layer inlet pressure transmitter and circulating pump;Circulating pump is connected with the spray layer interface of absorption tower by pipeline;Spray layer inlet pressure transmitter is set on the pipeline of circulating pump outlet pipeline and absorption tower connection;Spray layer inlet pressure transmitter is also connected to DCS system control equipment by signal;Device is also equipped with edge intelligent control integrated machine and circulating pump frequency conversion control cabinet;Edge intelligent control integrated machine and circulating pump frequency conversion control cabinet are connected with DCS system control equipment respectively.

[0004] Traditional wet desulphurization circulating pump when carrying out wet desulphurization process, solid impurities, precipitate in slurry pool bottom are not cleaned in time, precipitate can be sucked into the inlet pipeline of circulating pump, cause pipeline blockage, lead to the insufficient suction flow of pump, make pump appear cavitation, vibration and other problems, to solve the above problems, propose a kind of wet desulphurization circulating pump energy-saving control device. INVENTION CONTENTS

[0005] The utility model mainly provides a kind of wet desulphurization circulating pump energy-saving control device, which can clean the solid impurities and precipitate at the bottom of the slurry pool in time.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: an energy-saving control device for a wet desulfurization circulating pump, comprising a circulating pump control mechanism. The circulating pump control mechanism includes an absorption tower, a feed pipe, a discharge pipe, a connecting pipe, a circulating pipe, and a slurry tank. The inner wall of the bottom end of the absorption tower is fixedly connected to the outer wall of the slurry tank. One end of each of the feed pipe, discharge pipe, and connecting pipe is fixedly connected to the outer wall of the slurry tank. One end of the connecting pipe is fixedly connected to a variable frequency circulating pump. A stirring mechanism is fixedly connected to the bottom of the circulating pump control mechanism. The stirring mechanism includes a base and a flow meter. The system comprises a filter screen, a drive rod, a stirring rod, and a support ring. The top of the base is fixedly installed to the bottom of the absorption tower, and a stirring motor is fixedly installed inside the base. The filter screen is installed at an angle on the inner wall of the bottom of the slurry tank, with the lowest point of the filter screen lower than the discharge pipe and the highest point of the filter screen higher than the connecting pipe. The bottom of the support ring is fixedly connected to the bottom of the slurry tank, and the top of the support ring is fixedly connected to the bottom of the filter screen. The output end of the stirring motor is fixedly connected to the bottom of the drive rod, and the top of the drive rod passes through the support ring and is fixedly connected to the bottom of the stirring rod.

[0007] Preferably, a conveying pipe is fixedly connected to the top of the variable frequency circulating pump, and a spray pipe is fixedly installed on the inner wall of the top of the absorption tower. The top of the conveying pipe is fixedly connected to one end of the spray pipe. The variable frequency circulating pump conveys the slurry in the slurry tank to the spray pipe through the connecting pipe and the conveying pipe. The spray pipe sprays the slurry downward through multiple nozzles, so that the flue gas in the absorption tower comes into full contact with the slurry and removes sulfur dioxide from the flue gas.

[0008] Preferably, a concentration analyzer is fixedly connected to the top of the absorption tower, and a flow sensor is fixedly connected to the top of the concentration analyzer. The concentration analyzer detects the sulfur dioxide content in the flue gas in real time and transmits the data to the controller. The flow sensor is used to monitor the flue gas entering the absorption tower and transmit the data to the controller.

[0009] Preferably, one end of the flow sensor is fixedly connected to a circulation pipe, and one end of the circulation pipe is fixedly connected to the outside of the absorption tower. The flue gas with some sulfur dioxide removed is circulated into the absorption tower through the concentration analyzer, the flow sensor and the circulation pipe.

[0010] Preferably, a controller is fixedly installed on the outside of the absorption tower, and a liquid level sensor is fixedly connected to the top of the slurry tank. The liquid level sensor monitors the liquid level of the slurry in the absorption tower to prevent the liquid level from being too high or too low and affecting the operation of the system.

[0011] Preferably, a discharge pump is fixedly connected to one end of the discharge pipe, a slurry pump is fixedly connected to one end of the supply pipe, and a flow sensor is fixedly connected to the other end of the supply pipe. The slurry can be transported to the slurry tank through the supply pipe under the action of the slurry pump.

[0012] Compared with the prior art, the utility model has the advantages and positive effects that,

[0013] 1、 the utility model discloses, through flow sensor two real -time monitoring the slurry amount of conveying to the slurry tank, concentration analyzer real -time detection sulfur dioxide content in flue gas, flow sensor one monitoring the flue gas of entering the absorption tower, liquid level sensor monitors the liquid level height of slurry in the absorption tower, prevents liquid level too high or too low and influences the system operation, through the data of receiving from various sensors of controller to according to the control signal of output of preprogrammed control strategy, the output frequency of frequency converter of variable frequency circulating pump is adjusted, thereby the rotating speed of circulating pump motor is controlled, can according to actual working condition dynamic adjustment the operation of variable frequency circulating pump, avoid the energy waste of traditional fixed speed circulating pump under low load working condition, guarantee the stability of desulfurization efficiency, reduce the situation of the decline of desulfurization effect due to working condition change.

[0014] 2、 the utility model discloses, through setting up stirring mechanism, filter screen is obliquely installed in the bottom end inner wall position of slurry tank, and solid impurities and precipitate in the slurry tank can slide to its surface low place along the filter screen, and the solid impurities and precipitate on the filter screen are pulverized by the rotation of the stirring motor driven stirring rod, and the solid impurities and precipitate in the bottom of the slurry tank are cleaned in time, so that the solid impurities and precipitate are conveniently discharged outward through the discharge pipe, and meanwhile, the precipitate can be prevented from being sucked into the inlet pipeline of the variable frequency circulating pump to cause pipeline blockage, avoiding the cavitation, vibration and other problems of the variable frequency circulating pump. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 a perspective view of the energy-saving control device for a wet desulfurization circulating pump is provided for the utility model;

[0016] Figure 2 a top view structural schematic diagram of the energy-saving control device for a wet desulfurization circulating pump is provided for the utility model;

[0017] Figure 3 a front sectional view of the energy-saving control device for a wet desulfurization circulating pump is provided for the utility model;

[0018] Figure 4 a front sectional view of the energy-saving control device for a wet desulfurization circulating pump is provided for the utility model; Figure 3 a detail enlarged view of position A in the energy-saving control device for a wet desulfurization circulating pump is provided for the utility model.

[0019] Legend: 1, circulating pump control mechanism; 2, stirring mechanism; 11, absorption tower; 12, feed pipe; 13, discharge pipe; 14, connecting pipe; 15, variable frequency circulating pump; 16, conveying pipe; 17, controller; 18, concentration analyzer; 19, flow sensor one; 110, circulating pipe; 111, discharge pump; 112, slurry supply pump; 113, flow sensor two; 114, liquid level sensor; 115, slurry tank; 116, spray pipe; 21, base; 22, stirring motor; 23, filter screen; 24, drive rod; 25, stirring rod; 26, support ring. DETAILED DESCRIPTION

[0020] In order to enable the above-mentioned purposes, features and advantages of the present application to be more clearly understood, the present application will be further described below with reference to the drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0021] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced without the specific details, which are different from those described herein, and therefore, the present application is not limited to the specific embodiments disclosed in the following description.

[0022] Please refer to Figure 1 - Figure 4 The present application provides a technical solution: a wet desulfurization circulating pump energy-saving control device, comprising a circulating pump control mechanism 1, the circulating pump control mechanism 1 comprising an absorption tower 11, a feed pipe 12, a discharge pipe 13, a connecting pipe 14, a circulating pipe 110 and a slurry tank 115, the inner wall of the bottom end of the absorption tower 11 is fixedly connected with the outer wall of the slurry tank 115, one end of the feed pipe 12, the discharge pipe 13 and the connecting pipe 14 are fixedly communicated with the outer wall of the slurry tank 115, one end of the connecting pipe 14 is fixedly connected with a variable frequency circulating pump 15, the bottom of the circulating pump control mechanism 1 is fixedly connected with a stirring mechanism 2, the stirring mechanism 2 comprises a base 21, a filter screen 23, a drive rod 24, a stirring rod 25 and a support ring 26, the top end of the base 21 is fixedly installed with the bottom of the absorption tower 11, and the inside of the base 21 is fixedly installed with a stirring motor 22, the filter screen 23 is installed obliquely on the inner wall of the bottom end of the slurry tank 115, the lowest part of the filter screen 23 is lower than the discharge pipe 13, and the highest part of the filter screen 23 is higher than the connecting pipe 14, the bottom of the support ring 26 is fixedly connected with the bottom of the slurry tank 115, and the top of the support ring 26 is fixedly connected with the bottom of the filter screen 23, the output end of the stirring motor 22 is fixedly connected with the bottom of the drive rod 24, and the top of the drive rod 24 is fixedly connected with the bottom of the stirring rod 25 through the support ring 26.

[0023] As Figure 2 and Figure 3As shown, the top end of the frequency conversion circulating pump 15 is fixedly connected with a conveying pipe 16, the inner wall of the top end of the absorption tower 11 is fixedly installed with a spraying pipe 116, the top end of the conveying pipe 16 is fixedly connected with one end of the spraying pipe 116, the frequency conversion circulating pump 15 conveys the slurry in the slurry tank 115 into the spraying pipe 116 through the connecting pipe 14 and the conveying pipe 16, the spraying pipe 116 sprays the slurry downward through a plurality of nozzles, so that the flue gas in the absorption tower 11 is fully contacted with the slurry, and the sulfur dioxide in the flue gas is removed.

[0024] As shown in Figure 2 and Figure 3 , the top of the absorption tower 11 is fixedly connected with a concentration analyzer 18, and the top of the concentration analyzer 18 is fixedly connected with a flow sensor 19, the concentration analyzer 18 detects the content of sulfur dioxide in the flue gas in real time and transmits to the controller 17, and the flow sensor 19 is used for monitoring the flue gas entering the absorption tower 11 and transmitting to the controller 17.

[0025] As shown in Figure 2 , one end of the flow sensor 19 is fixedly connected with a circulating pipe 110, and one end of the circulating pipe 110 is fixedly communicated with the outside of the absorption tower 11, the flue gas after removing part of the sulfur dioxide is circulated and conveyed into the absorption tower 11 through the concentration analyzer 18, the flow sensor 19 and the circulating pipe 110.

[0026] As shown in Figure 3 , the outside of the absorption tower 11 is fixedly installed with a controller 17, the top end of the slurry tank 115 is fixedly connected with a liquid level sensor 114, the liquid level sensor 114 monitors the liquid level height of the slurry in the absorption tower 11, so as to prevent the system from being affected by too high or too low liquid level.

[0027] As shown in Figure 2 and Figure 3 , one end of the discharge pipe 13 is fixedly connected with a discharge pump 111, one end of the feeding pipe 12 is fixedly connected with a slurry pump 112, and the other end of the feeding pipe 12 is fixedly connected with a flow sensor 113, the slurry can be conveyed into the slurry tank 115 through the feeding pipe 12 under the action of the slurry pump 112.

[0028] The method for using and the working principle of the device: the circulating pump energy-saving control device is composed of a circulating pump control mechanism 1 and a stirring mechanism 2. When the circulating pump control mechanism 1 is used, the slurry is transported into the slurry tank 115 through the feeding pipe 12 under the action of the slurry supply pump 112. The frequency conversion circulating pump 15 transports the slurry in the slurry tank 115 into the spray pipe 116 through the connecting pipe 14 and the conveying pipe 16. The spray pipe 116 sprays the slurry downward through a plurality of nozzles, so that the flue gas in the absorption tower 11 fully contacts with the slurry, removes the sulfur dioxide in the flue gas, and the flue gas after removing part of the sulfur dioxide is circulated and transported into the absorption tower 11 through the concentration analyzer 18, the flow sensor 1 19 and the circulating pipe 110. The frequency conversion circulating pump 15 circulates and transports the slurry in the slurry tank 115 to spray, so as to perform the circulating wet desulfurization treatment on the flue gas in the absorption tower 11.

[0029] The flow sensor 2 113 can monitor the amount of slurry transported into the slurry tank 115 in real time and transmit it to the controller 17. The concentration analyzer 18 detects the sulfur dioxide content in the flue gas in real time and transmits it to the controller 17. The flow sensor 1 19 is used to monitor the flue gas entering the absorption tower 11 and transmits it to the controller 17. The liquid level sensor 114 monitors the liquid level height of the slurry in the absorption tower 11 to prevent the system from being affected by too high or too low liquid level. The frequency converter in the frequency conversion circulating pump 15 can adjust the rotating speed of the circulating pump motor. The controller 17 receives data from various sensors (flow sensor 1 19, flow sensor 2 113, liquid level sensor 114, sulfur dioxide concentration analyzer 18) and outputs control signals according to the pre-programmed control strategy to adjust the output frequency of the frequency converter of the frequency conversion circulating pump 15, so as to control the rotating speed of the circulating pump motor. The operation of the frequency conversion circulating pump 15 can be dynamically adjusted according to the actual working condition, which avoids the energy waste of the traditional fixed-speed circulating pump under low load working condition, ensures the stability of the desulfurization efficiency, and reduces the situation that the desulfurization effect is reduced due to the change of working condition.

[0030] At the same time, during the wet desulfurization process, the slurry contains solid particles such as limestone particles and gypsum crystals. The solid impurities and precipitates are formed at the bottom of the slurry pool. The filter screen 23 is installed obliquely at the inner wall position of the bottom end of the slurry tank 115. Therefore, the solid impurities and precipitates will slide to the low position of the surface of the filter screen 23. By starting the stirring motor 22, the stirring motor 22 drives the stirring rod 25 to rotate through the driving rod 24, so as to crush the solid impurities and precipitates that slide onto the filter screen 23. The solid impurities and precipitates at the bottom of the slurry tank 115 are cleaned in time, which facilitates the solid impurities and precipitates to be discharged outward through the discharge pipe 13. At the same time, the problem that the precipitates are sucked into the inlet pipe of the frequency conversion circulating pump 15 to cause pipe blockage can be avoided, and the problems of cavitation and vibration of the frequency conversion circulating pump 15 can be avoided.

[0031] The above merely describes preferred embodiments of the present application, and is not intended to limit the present application in other forms, and any skilled person in the art can modify or change the above disclosed technical content to equivalent embodiments applied to other fields with equivalent changes, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical scheme of the present application still falls within the protection scope of the present application.

Claims

1. An energy-saving control device for a wet desulfurization circulating pump, comprising a circulating pump control mechanism (1), wherein the circulating pump control mechanism (1) comprises an absorption tower (11), a feed pipe (12), a discharge pipe (13), a connecting pipe (14), a circulating pipe (110), and a slurry tank (115), characterized in that: The bottom inner wall of the absorption tower (11) is fixedly connected to the outer wall of the slurry tank (115). One end of the feed pipe (12), discharge pipe (13), and connecting pipe (14) are all fixedly connected to the outer wall of the slurry tank (115). One end of the connecting pipe (14) is fixedly connected to a variable frequency circulating pump (15). The bottom of the circulating pump control mechanism (1) is fixedly connected to a stirring mechanism (2). The stirring mechanism (2) includes a base (21), a filter screen (23), a drive rod (24), a stirring rod (25), and a support ring (26). The top of the base (21) is fixedly installed to the bottom of the absorption tower (11), and the base (21) A stirring motor (22) is fixedly installed inside the slurry tank (115). The filter screen (23) is installed obliquely on the inner wall of the bottom end of the slurry tank (115). The lowest point of the filter screen (23) is lower than the discharge pipe (13), and the highest point of the filter screen (23) is higher than the connecting pipe (14). The bottom of the support ring (26) is fixedly connected to the bottom of the slurry tank (115), and the top of the support ring (26) is fixedly connected to the bottom of the filter screen (23). The output end of the stirring motor (22) is fixedly connected to the bottom of the drive rod (24), and the top of the drive rod (24) passes through the support ring (26) and is fixedly connected to the bottom of the stirring rod (25).

2. The energy-saving control device for the wet desulfurization circulating pump according to claim 1, characterized in that: The top of the variable frequency circulating pump (15) is fixedly connected to a conveying pipe (16), and the top inner wall of the absorption tower (11) is fixedly installed with a spray pipe (116). The top of the conveying pipe (16) is fixedly connected to one end of the spray pipe (116).

3. The energy-saving control device for the wet desulfurization circulating pump according to claim 1, characterized in that: A concentration analyzer (18) is fixedly connected to the top of the absorption tower (11), and a flow sensor (19) is fixedly connected to the top of the concentration analyzer (18).

4. The energy-saving control device for the wet desulfurization circulating pump according to claim 3, characterized in that: One end of the flow sensor (19) is fixedly connected to a circulation pipe (110), and one end of the circulation pipe (110) is fixedly connected to the outside of the absorption tower (11).

5. The energy-saving control device for the wet desulfurization circulating pump according to claim 1, characterized in that: A controller (17) is fixedly installed on the outside of the absorption tower (11), and a liquid level sensor (114) is fixedly connected to the top of the slurry tank (115).

6. The energy-saving control device for the wet desulfurization circulating pump according to claim 1, characterized in that: One end of the discharge pipe (13) is fixedly connected to a discharge pump (111), one end of the feed pipe (12) is fixedly connected to a slurry pump (112), and the other end of the feed pipe (12) is fixedly connected to a flow sensor (113).

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