Automatic detection and defoaming treatment method and equipment for slurry foams in absorption tower

Abstract

The invention discloses an absorption tower internal slurry foam automatic detection and defoaming treatment method and equipment, and relates to the technical field of absorption tower foam elimination, the method comprises the following steps: (1) using two floating balls with different densities to detect the height of foam generated by slurry in an absorption tower; (2) the control host obtains the actual foam volume in the absorption tower through the height of the foam and the cross section area of the cavity in the absorption tower; and (3) the control host obtains the adding amount of the required defoaming agent according to the actual foam volume and the ratio of the foam to the defoaming agent, and the defoaming device adds the defoaming agent into the foam in the absorption tower according to the adding amount of the required defoaming agent. According to the method, the content of foam in the absorption tower can be accurately detected, so that the dosage of the defoaming agent can be well controlled, automatic defoaming control can be realized, the defoaming efficiency is high, the dosage of the defoaming agent can be reduced, foam and slurry of the absorption tower are prevented from overflowing, and the method is environment-friendly and energy-saving.

Description

Technical Field

[0001] The invention relates to the technical field of foam elimination of an absorption tower, and in particular to a method and equipment for automatically detecting and defoaming slurry foam inside an absorption tower. Background Art

[0002] In a thermal power plant, it is necessary to treat the waste gas generated by the thermal power plant. Among them, desulfurization of the waste gas through the power plant desulfurization system is one of the treatment steps. The absorption tower is a relatively important waste gas desulfurization treatment device in the power plant desulfurization system. During the operation of the power plant desulfurization system, there are often situations such as oil or high-concentration dust carried in the flue gas being captured by the absorption tower and entering the absorption tower, and the salt content and COD concentration of the desulfurization process water are high, which causes the slurry quality in the absorption tower to gradually deteriorate, and a large amount of difficult-to-break foam appears in the slurry of the absorption tower, floating on the surface of the slurry in the absorption tower. The bubbles will seriously damage the desulfurization process. After the increase of foam, it will cause the overflow pipe on the absorption tower to siphon, and a large amount of slurry will overflow to the ground, causing serious pollution on the site.

[0003] At present, the main method for dealing with bubbles is to add defoamers to eliminate the foam that has already been generated. The specific process is: when a large amount of foam overflows from the ditch of the absorption tower, after the on-site inspection personnel find it, they will notify the operating personnel to add defoamers to the sump of the absorption tower, and then use the sump pump to pump the slurry containing defoamers into the absorption tower and mix it with the slurry in the tower to achieve the defoaming effect.

[0004] The existing methods for dealing with bubbles have the disadvantages of slow defoaming effect and low defoaming efficiency. The foam content cannot be accurately detected, making it impossible to accurately control the amount of defoaming agent. Too little defoaming agent cannot completely remove the foam, resulting in low defoaming efficiency. Too much defoaming agent causes waste of resources and is difficult to detect in time, often causing large amounts of foam and slurry to overflow after siphoning, seriously polluting the on-site environment. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems and provide a method for automatically detecting and defoaming the slurry foam inside an absorption tower. The method can accurately detect the foam content in the absorption tower, thereby being able to well control the amount of defoaming agent used, and can achieve automatic control of defoaming with high defoaming efficiency. It can also reduce the amount of defoaming agent used, prevent the overflow of foam and slurry in the absorption tower, and is environmentally friendly and energy-saving.

[0006] Another object of the present invention is to provide an automatic detection and defoaming treatment device for slurry foam inside an absorption tower.

[0007] The purpose of the present invention is achieved through the following technical solutions: A method for automatically detecting and defoaming slurry foam inside an absorption tower comprises the following steps: (1) Use two floats of different densities to detect the height of the foam generated by the slurry inside the absorption tower; (2) The control host obtains the actual foam volume inside the absorption tower by measuring the height of the foam and the cross-sectional area of ​​the cavity inside the absorption tower; (3) The control host obtains the required amount of defoamer to be added according to the actual foam volume and the ratio of foam to defoamer, and the defoamer device adds defoamer to the foam inside the absorption tower according to the required amount of defoamer to be added.

[0008] The working principle of the above-mentioned automatic detection and defoaming treatment method for slurry foam inside the absorption tower is: The present invention adopts a double-dense float ball and uses the density difference of the two float balls to detect the height of the foam generated by the absorption tower. Because the cross-sectional area of ​​the internal cavity of the absorption tower is fixed, the control host accurately calculates the actual foam volume of the absorption tower through the height and cross-sectional area of ​​the foam; after detecting the actual foam volume, according to the foam content (actual foam volume), the control host calculates the required amount of defoamer to be added (the required volume of defoamer) according to the ratio of foam to defoamer, and controls the defoaming device to add defoamer to the foam inside the absorption tower to defoam the foam. In the method for automatically detecting and defoaming the slurry foam inside the absorption tower of the present invention, the defoaming device works only when the height of the foam generated by the slurry inside the absorption tower reaches the set upper limit.

[0009] In a preferred embodiment of the present invention, in step (3), the defoaming device adds the defoaming agent to the foam inside the absorption tower by spraying. Defoaming by spraying can improve the uniformity of adding the defoaming agent and improve the defoaming effect. Compared with the atomization defoaming method in the prior art, the spraying method of the present invention can avoid the disadvantage that the defoaming agent will be evaporated and lost by the high-temperature flue gas after being atomized in the absorption tower.

[0010] Preferably, the foam generated by the slurry inside the absorption tower is located above the surface of the slurry, and the foam forms a foam layer. In step (3), the defoaming device sprays the defoaming agent directly inside the foam layer, and the foam and the defoaming agent react to defoam the foam. By directly spraying inside the foam layer, the foam and the defoaming agent can be fully contacted, thereby improving the defoaming effect.

[0011] Preferably, in step (1), the two floats of different densities are respectively a first float and a second float, the density of the first float is less than the density of the foam generated by the slurry inside the absorption tower; the first float floats on the foam surface; the density of the second float is less than the density of the slurry inside the absorption tower and greater than the density of the foam generated by the slurry inside the absorption tower, and the first float floats on the slurry surface inside the absorption tower; the height of the foam generated by the slurry inside the absorption tower is obtained by the height difference between the first float and the second float. In the above steps, the different densities of the floats are used to make the floats at different positions, the first float floats on the foam surface, which is used to detect the foam level, and the second float is located at the junction of the slurry and the foam, that is, it is in a position floating on the slurry surface and sinking to the bottom of the foam. Through the height difference between the two floats, the height of the foam generated by the slurry inside the absorption tower, that is, the height of the foam layer, can be obtained by subtracting the height of the second float from the height of the first float.

[0012] Preferably, in step (1), the height positions of the first float and the second float are simultaneously transmitted to a Hall position sensor, the Hall position sensor recognizes two position signals, and the control host calculates the height of the foam generated by the slurry inside the absorption tower through the height difference between the two position signals of the Hall position sensor.

[0013] A device for automatically detecting and defoaming the foam in slurry inside an absorption tower is used to implement the above-mentioned method for automatically detecting and defoaming the foam in slurry inside an absorption tower. The device for automatically detecting and defoaming the foam in slurry inside an absorption tower comprises a control host, a double-float foam measuring level gauge for detecting the height of the foam generated by the slurry inside the absorption tower, and a defoaming device for adding a defoaming agent to the foam; wherein the double-float foam measuring level gauge comprises two floats of different densities.

[0014] Preferably, the defoaming device includes a defoaming agent storage tank arranged outside the absorption tower for storing defoaming agent, a defoaming agent spraying mechanism arranged inside the absorption tower for spraying defoaming agent, and a defoaming agent spraying metering pump for pumping the defoaming agent in the defoaming agent storage tank to the defoaming agent spraying mechanism; the defoaming agent spraying metering pump is connected to the control host. In the above structure, the double-float foam measuring level gauge detects the height of the foam generated by the slurry inside the absorption tower, and then calculates the actual foam volume of the absorption tower. After the foam is detected, the required amount of defoaming agent is calculated according to the foam content through the control host according to the ratio of defoaming agent to foam, and the defoaming agent spraying metering pump is controlled to pump the defoaming agent in the defoaming agent storage tank to the defoaming agent spraying mechanism according to the amount of addition. The defoaming agent spraying mechanism sprays the defoaming agent directly into the foam to defoam the foam.

[0015] Preferably, the defoaming agent spraying mechanism includes a frame and a plurality of nozzles arranged on the frame; the frame is a disc structure, an interface is arranged in the middle of the frame, the frame includes a ring arranged coaxially with the interface and a plurality of spokes arranged between the interface and the ring and distributed radially; a plurality of nozzles are arranged on the ring and the spokes respectively; one end of the interface is connected to the nozzle, and the other end of the interface is connected to the outlet of the defoaming agent spraying metering pump. By arranging a plurality of nozzles, the defoaming agent can be evenly and directly contacted with the foam during spraying, and a good defoaming effect can be achieved after mixing; by arranging a frame, the nozzles can be installed.

[0016] Preferably, the interface is connected to the outlet of the defoamer spray metering pump through a hose; the frame is a floating frame, which floats on the surface of the slurry inside the absorption tower; the nozzle is arranged at the upper end of the floating frame, and the nozzle sprays the defoamer upward on the foam. In the above structure, the floating frame floats on the surface of the slurry inside the absorption tower, that is, the floating frame is located at the junction of the slurry and the foam, and the floating frame is in a position floating on the surface of the slurry and sinking to the bottom of the foam, and can float with the liquid level of the slurry; the nozzle is arranged at the upper end of the floating frame, so that the nozzle is located at the lower end of the foam layer (the nozzle is still located in the foam layer), and the upward spraying method is adopted, so that the defoamer can be sprayed inside the foam layer, so that the foam and the defoamer are in full contact, thereby improving the defoaming effect.

[0017] Preferably, the double-float foam measuring level gauge is installed inside the absorption tower, and includes a Hall position sensor, a connecting rod arranged between the Hall position sensor and each of the floating balls, the upper end of the connecting rod is slidably connected to the Hall position sensor, and the lower end of the connecting rod is fixedly connected to the floating ball; the Hall position sensor is connected to the control host. During detection, the first floating ball floats on the foam surface, and the second floating ball floats on the slurry surface. The two floating balls have a height difference, so that the height positions of the two connecting rods are different. The two connecting rods transmit the height positions of the slurry and foam (i.e., the height positions of the two floating balls) to the Hall position sensor at the same time. The Hall position sensor recognizes two position signals, and the control host calculates the height of the foam generated by the slurry inside the absorption tower through the height difference of the two position signals of the Hall position sensor.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The method and equipment for automatically detecting and defoaming the slurry foam inside the absorption tower of the present invention can accurately detect the height of the foam generated by the slurry inside the absorption tower through a double-density float, thereby obtaining the actual foam volume, and controlling the main engine to control the defoaming device to add an appropriate amount of defoaming agent for defoaming according to the ratio of foam to defoaming agent; this method can accurately detect the content of foam in the absorption tower, thereby being able to well control the amount of defoaming agent, reducing the amount of defoaming agent used, and saving resources.

[0019] 2. The method and equipment for automatically detecting and defoaming the foam in the slurry inside the absorption tower of the present invention, when the height of the foam generated by the slurry inside the absorption tower reaches the set upper limit, the control host controls the defoaming device to work, and the foam in the absorption tower can be defoamed in time, which prevents the increase of foam in the absorption tower from causing siphoning of the overflow pipe, causing a large amount of slurry and foam to overflow to the ground, causing serious pollution on site, and has a good environmental protection effect.

[0020] 3. The method and equipment for automatically detecting and defoaming the slurry foam inside the absorption tower of the present invention can realize automatic control of defoaming with high defoaming efficiency. The equipment has a simple structure, is easy to install, and has high reliability. It can perform online monitoring and automatic maintenance of the absorption tower for a long time, has low material consumption, and is environmentally friendly and energy-saving.

[0021] 4. In the prior art, a ruler or a pressure level gauge is usually used to measure the foam height; when a ruler is used, the ruler needs to be set on the glass of the observation window. The glass of the observation window is easily contaminated by residual slurry or foam, which in turn blocks the glass. The operator cannot clearly and intuitively obtain the slurry level height and foam height, and cannot accurately detect the foam content, so the amount of defoaming agent cannot be accurately controlled. When using a pressure level gauge, it is necessary to install two pressure level gauges at different heights to measure the slurry pressure and slurry density. Since the slurry density measured by the pressure level gauge cannot truly reflect the true density of the slurry, there are errors in the measurement, and the true slurry level height and foam height cannot be accurately obtained. The foam content cannot be accurately detected, so the amount of defoaming agent cannot be accurately controlled, and the calculation process is complicated. Compared with the prior art, the method and equipment for automatically detecting and defoaming treatment of slurry foam inside the absorption tower in the present invention can accurately detect the height of the foam generated by the slurry inside the absorption tower through two floats of different densities. The two floats are at different heights, which can intuitively reflect the height of the foam. The measurement is accurate and will not be affected by the problem of slurry or foam contamination. The foam content in the absorption tower can be accurately detected without measuring the slurry pressure and slurry density, and the calculation process is simpler and more accurate.

[0022] 5. The method and equipment for automatically detecting and defoaming the slurry foam inside the absorption tower of the present invention has the advantages of simple structure, accurate measurement, stability and reliability, in which the heights of the two floats are directly transmitted through two connecting rods. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of one of the specific implementation methods of an automatic detection and defoaming treatment device for slurry foam inside an absorption tower in the present invention when it is installed on an absorption tower.

[0024] Figure 2 It is a structural schematic diagram of an automatic detection and defoaming treatment device for slurry foam inside an absorption tower in the present invention.

[0025] Figure 3 It is a structural schematic diagram of the defoamer spraying mechanism in the present invention.

[0026] Figure 4 It is a schematic structural diagram of the double-float type foam measuring liquid level gauge in the present invention. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto. Example

[0028] See also Figure 1-Figure 2 This embodiment discloses a method for automatically detecting and defoaming slurry foam inside an absorption tower, comprising the following steps: (1) Using two float balls 3-1 of different densities to detect the height of the foam generated by the slurry inside the absorption tower 1; (2) controlling the host 2 to obtain the actual foam volume inside the absorption tower 1 through the height of the foam and the cross-sectional area of ​​the cavity inside the absorption tower 1; (3) The control host 2 obtains the required amount of defoaming agent to be added according to the actual foam volume and the ratio of foam to defoaming agent, and the defoaming device adds the defoaming agent to the foam inside the absorption tower 1 according to the required amount of defoaming agent to be added.

[0029] See also Figure 1-Figure 2 The working principle of the above-mentioned method for automatically detecting and defoaming slurry foam inside the absorption tower is: This embodiment adopts a double-dense float 3-1, and uses the density difference of the two floats 3-1 to detect the height of the foam generated by the absorption tower 1. Because the cross-sectional area of ​​the internal cavity of the absorption tower 1 is fixed, the control host 2 accurately calculates the actual foam volume of the absorption tower 1 according to the height and cross-sectional area of ​​the foam based on the volume calculation formula; after detecting the actual foam volume, according to the foam content (actual foam volume), the control host 2 calculates the required amount of defoamer to be added (the required volume of defoamer) according to the ratio of foam to defoamer, and controls the defoaming device to add defoamer to the foam inside the absorption tower 1 to defoam the foam. In the method for automatically detecting and defoaming the slurry foam inside the absorption tower of this embodiment, the defoaming device works only when the height of the foam generated by the slurry inside the absorption tower 1 reaches the set upper limit.

[0030] See also Figure 1-Figure 2 , the ratio of foam to defoamer in this embodiment can be the volume ratio of foam to defoamer or the weight ratio of foam to defoamer, which can be set according to the actual situation. The ratio is the ratio that the defoamer can just eliminate the foam. For example, when the ratio of foam to defoamer is a volume ratio, in step (3), the control host 2 can calculate the required volume of defoamer (i.e., the required amount of defoamer) according to the actual foam volume and the volume ratio of foam to defoamer according to the formula: V1: V2 = K, where K is the ratio of foam to defoamer, V1 is the actual foam volume, and V2 is the required volume of defoamer, and the defoamer device adds defoamer to the foam inside the absorption tower 1 according to the required volume of defoamer. When the ratio of foam to defoamer is a weight ratio, the actual foam volume can be converted into weight to calculate the weight of the required defoamer (i.e., the required amount of defoamer), and the defoamer device adds defoamer to the foam inside the absorption tower 1 according to the required weight of the defoamer.

[0031] See also Figure 1-Figure 2 In this embodiment, slurry is stored in the internal cavity of the absorption tower 1, and the slurry is sulfur agent slurry. The cross-sectional area of ​​the internal cavity of the absorption tower 1 can be measured on site.

[0032] See also Figure 1-Figure 2 In step (3), the defoaming device adds the defoaming agent to the foam inside the absorption tower 1 by spraying. Defoaming by spraying can improve the uniformity of adding the defoaming agent and improve the defoaming effect. Compared with the atomization defoaming method in the prior art, the spraying method of this embodiment can avoid the disadvantage that the defoaming agent will be evaporated and lost by the high-temperature flue gas after being atomized in the absorption tower 1.

[0033] See also Figure 1-Figure 2The foam generated by the slurry inside the absorption tower 1 is located above the surface of the slurry, and the foam forms a foam layer. In step (3), the defoaming device sprays the defoaming agent directly inside the foam layer, and the foam and the defoaming agent react to defoam the foam. By directly spraying the foam layer, the foam and the defoaming agent can be fully contacted, thereby improving the defoaming effect.

[0034] See also Figure 1-Figure 2 and Figure 4 In step (1), the two floats 3-1 with different densities are respectively the first float 3-11 and the second float 3-12, the density of the first float 3-11 is less than the density of the foam generated by the slurry inside the absorption tower 1; the first float 3-11 floats on the foam surface; the density of the second float 3-12 is less than the density of the slurry inside the absorption tower 1 and greater than the density of the foam generated by the slurry inside the absorption tower 1, and the first float 3-11 floats on the surface of the slurry inside the absorption tower 1; the height of the foam generated by the slurry inside the absorption tower 1 is obtained by the height difference between the first float 3-11 and the second float 3-12. In the above steps, the different densities of the float 3-1 are utilized to make the float 3-1 in different positions. The first float 3-11 floats on the foam surface to detect the foam level, and the second float 3-12 is located at the junction of the slurry and the foam, that is, it floats on the slurry surface and sinks to the bottom of the foam. Through the height difference between the two floats 3-1, the height of the first float 3-11 minus the height of the second float 3-12 can be obtained to obtain the height of the foam generated by the slurry inside the absorption tower 1, that is, the height of the foam layer.

[0035] See also Figure 1-Figure 2 and Figure 4 In step (1), the height positions of the first float 3-11 and the second float 3-12 are simultaneously transmitted to the Hall position sensor 3-2, the Hall position sensor 3-2 recognizes two position signals, and the control host 2 calculates the height of the foam generated by the slurry inside the absorption tower 1 through the height difference between the two position signals of the Hall position sensor 3-2. Example

[0036] join Figure 1-Figure 2 This embodiment discloses an automatic detection and defoaming treatment device for slurry foam inside an absorption tower, which is used to implement the automatic detection and defoaming treatment method for slurry foam inside an absorption tower as described in Example 1. The automatic detection and defoaming treatment device for slurry foam inside an absorption tower includes a control host 2, a double-float foam measuring level gauge 3 for detecting the height of the foam generated by the slurry inside the absorption tower 1, and a defoaming device for adding a defoaming agent to the foam; wherein the double-float foam measuring level gauge 3 includes two floats 3-1 with different densities.

[0037] join Figure 1-Figure 2The equipment in this embodiment can achieve continuous online detection. The defoaming device can accurately add defoaming agent according to the foam content in real time, which can greatly reduce the use of defoaming agent. The double-float foam measuring level gauge 3 detects the height of the foam in real time. When the control host 2 recognizes that the height of the foam reaches the set upper limit, the defoaming device is controlled to automatically add defoaming agent for defoaming, and the defoaming efficiency is high.

[0038] join Figure 1-Figure 2 The defoaming device includes a defoaming agent storage tank 4 arranged outside the absorption tower 1 for storing defoaming agent, a defoaming agent spraying mechanism 5 arranged inside the absorption tower 1 for spraying defoaming agent, and a defoaming agent spraying metering pump 6 for pumping the defoaming agent in the defoaming agent storage tank 4 to the defoaming agent spraying mechanism 5; the defoaming agent spraying metering pump 6 is connected to the control host 2. In the above structure, the double-float foam measuring level gauge 3 detects the height of the foam generated by the slurry inside the absorption tower 1, and then calculates the actual foam volume of the absorption tower 1. After the foam is detected, the required amount of defoaming agent is calculated according to the foam content through the control host 2 according to the ratio of defoaming agent to foam, and the defoaming agent spraying metering pump 6 is controlled to pump the defoaming agent in the defoaming agent storage tank 4 to the defoaming agent spraying mechanism 5 according to the added amount. The defoaming agent spraying mechanism 5 sprays the defoaming agent directly into the foam to defoam the foam. The defoaming agent spraying metering pump 6 is used for pumping, and the amount of defoaming agent used can be accurately recorded.

[0039] join Figure 1-Figure 2 The defoamer storage tank 4, the defoamer spray metering pump 6 and the control host 2 are integrated. A filling port 4-1 is provided on the top of the defoamer storage tank 4. The filling port 4-1 is the tank port of the defoamer storage tank 4 and is used to add defoamer into the defoamer storage tank 4. The defoamer storage tank 4 is installed on the outer wall of the absorption tower 1 through a flange 10, specifically, it is installed on the tower wall at 12 meters. An operating platform 7 is provided on the tower wall at this location. The operating platform 7 is used for staff to stand, so that the staff can usually add defoamer to the defoamer storage tank 4. At the same time, it is also convenient for the staff to inspect and maintain the equipment on the operating platform 7. The double-float foam measuring level gauge 3 is installed at 12 meters inside the absorption tower 1 and is connected to the defoamer storage tank 4 through the flange 10.

[0040] join Figure 1-Figure 3The defoaming agent spraying mechanism 5 includes a frame 5-1 and a plurality of nozzles 5-2 arranged on the frame 5-1; the frame 5-1 is a disc structure, an interface 8 is arranged in the middle of the frame 5-1, the frame 5-1 includes a ring arranged coaxially with the interface 8 and a plurality of spokes arranged between the interface 8 and the ring and distributed along the radial direction; a plurality of nozzles 5-2 are arranged on the ring and the spokes respectively; one end of the interface 8 is connected to the nozzle 5-2, and the other end of the interface 8 is connected to the outlet of the defoaming agent spraying metering pump 6. By arranging a plurality of nozzles 5-2, the defoaming agent can be evenly and directly contacted with the foam during spraying, and a good defoaming effect can be achieved after mixing; by arranging the frame 5-1, the nozzles 5-2 can be installed.

[0041] join Figure 1-Figure 3 , the interface 8 is connected to the outlet of the defoamer spray metering pump 6 through a hose 9; the frame 5-1 is a floating frame, which floats on the surface of the slurry inside the absorption tower 1; the nozzle 5-2 is arranged at the upper end of the floating frame, and the nozzle 5-2 sprays the defoamer upward on the foam. In the above structure, the floating frame floats on the surface of the slurry inside the absorption tower 1, that is, the floating frame is located at the junction of the slurry and the foam, and the floating frame is in a position floating on the slurry surface and sinking to the bottom of the foam, and can float with the liquid level of the slurry; the nozzle 5-2 is arranged at the upper end of the floating frame, so that the nozzle 5-2 is located at the lower end of the foam layer (the nozzle 5-2 is still located in the foam layer), and the upward spraying method is adopted, so that the defoamer can be sprayed inside the foam layer, so that the foam and the defoamer are fully in contact, and the defoaming effect is improved.

[0042] See also Figure 1-Figure 3 The number of the nozzles 5-2 is 48, and the floating frame is made of PP material (PP material can withstand high temperatures of 120-150°C, and the slurry temperature is below 80°C when the absorption tower 1 is running). The ring and the spokes are hollow sealed structures. The volume and density of the floating frame are smaller than the volume and density of the slurry inside the absorption tower 1. By setting a hose 9, the defoaming agent spraying mechanism 5 is convenient for floating. The defoaming agent spraying mechanism 5 can float within the range of 8-11 meters with the liquid level of the slurry. In this way, it can be ensured that the 48 nozzles 5-2 evenly distributed and installed on the upper end of the floating frame are always located on the surface of the slurry and the bottom of the foam layer. When spraying, the defoaming agent can be evenly contacted and mixed with the foam directly to achieve a good defoaming effect.

[0043] See also Figure 1-Figure 3 , the density of the floating frame is greater than the density of the foam.

[0044] See also Figure 1-Figure 2 and Figure 4The double-float foam measuring level gauge 3 is installed inside the absorption tower 1. The double-float foam measuring level gauge 3 includes a Hall position sensor 3-2, a connecting rod 3-3 arranged between the Hall position sensor 3-2 and each of the floats 3-1, the upper end of the connecting rod 3-3 is slidably connected to the Hall position sensor 3-2, and the lower end of the connecting rod 3-3 is fixedly connected to the float 3-1; the Hall position sensor 3-2 is connected to the control host 2. When the double-float foam measuring level meter 3 is detecting, the first float 3-11 floats on the foam surface, and the second float 3-12 floats on the slurry surface. The two floats 3-1 have a height difference, so that the height positions of the two connecting rods 3-3 are different. The two connecting rods 3-3 transmit the height positions of the slurry and foam (i.e., the height positions of the two floats 3-1) to the Hall position sensor 3-2 at the same time. The Hall position sensor 3-2 recognizes the two position signals, and the control host 2 calculates the height of the foam generated by the slurry inside the absorption tower 1 through the height difference of the two position signals of the Hall position sensor 3-2.

[0045] See also Figure 1-Figure 2 and Figure 4 The Hall position sensor 3 - 2 is connected to the control host 2 via a signal transmission cable 11 , and the control host 2 is also connected to a power supply and a signal output cable 12 .

[0046] See also Figure 1-Figure 2 , the control host 2 is a single chip microcomputer.

[0047] See also Figure 1-Figure 2 and Figure 4 The double-float foam measuring level gauge 3 is installed at 12 meters inside the absorption tower 1. When the absorption tower 1 is operating normally, the liquid level range of the slurry is about 8.5-10 meters. The two floats 3-1 of the double-float foam measuring level gauge 3 are set to float up and down within the range of 8-11 meters.

[0048] See also Figure 1-Figure 2 The absorption tower 1 of this embodiment is a desulfurization absorption tower of a thermal power plant, which is installed on the ground. The absorption tower 1 is provided with an inlet flue 13, an outlet flue 14 and an overflow pipe 15. A ditch 16 is provided on the ground. The outlet of the overflow pipe is located above the ditch 16, and the slurry discharged from the overflow pipe flows into the ditch 16. Example

[0049] The other structures of this embodiment are the same as those of Embodiment 2, except that the defoaming agent spraying mechanism 5 is fixed inside the absorption tower 1, and the nozzle 5-2 is arranged at the lower end of the frame 5-1, and the nozzle 5-2 sprays the defoaming agent on the foam from top to bottom.

[0050] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A method for automatically detecting and defoaming slurry foam inside an absorption tower, characterized in that: The following steps are involved: (1) Use two floats of different densities to detect the height of the foam generated by the slurry inside the absorption tower; (2) The control host obtains the actual foam volume inside the absorption tower by measuring the height of the foam and the cross-sectional area of ​​the cavity inside the absorption tower; (3) The control host obtains the required amount of defoamer to be added according to the actual foam volume and the ratio of foam to defoamer, and the defoamer device adds defoamer to the foam inside the absorption tower according to the required amount of defoamer to be added.

2. The method for automatically detecting and defoaming slurry foam inside an absorption tower according to claim 1, characterized in that: In step (3), the defoaming device adds the defoaming agent into the foam inside the absorption tower by spraying.

3. The method for automatically detecting and defoaming slurry foam inside an absorption tower according to claim 2, characterized in that: The foam generated by the slurry inside the absorption tower is located above the surface of the slurry, and the foam forms a foam layer. In step (3), the defoaming device sprays the defoaming agent directly into the foam layer, and the foam and the defoaming agent react to defoam the foam.

4. The method for automatically detecting and defoaming slurry foam inside an absorption tower according to claim 1, characterized in that: In step (1), two floats of different densities are respectively a first float and a second float, wherein the density of the first float is less than the density of the foam generated by the slurry inside the absorption tower; the first float floats on the surface of the foam; the density of the second float is less than the density of the slurry inside the absorption tower and greater than the density of the foam generated by the slurry inside the absorption tower, and the first float floats on the surface of the slurry inside the absorption tower; the height of the foam generated by the slurry inside the absorption tower is obtained by the height difference between the first float and the second float.

5. The method for automatically detecting and defoaming slurry foam inside an absorption tower according to claim 4, characterized in that: In step (1), the height positions of the first float and the second float are simultaneously transmitted to the Hall position sensor, which recognizes two position signals. The control host calculates the height of the foam generated by the slurry inside the absorption tower through the height difference between the two position signals of the Hall position sensor.

6. An automatic detection and defoaming treatment device for slurry foam inside an absorption tower, characterized in that: The automatic detection and defoaming treatment equipment for slurry foam inside the absorption tower is used to implement the automatic detection and defoaming treatment method for slurry foam inside the absorption tower as described in any one of claims 1 to 5. The automatic detection and defoaming treatment equipment for slurry foam inside the absorption tower includes a control host, a double-float foam measuring level gauge for detecting the height of the foam generated by the slurry inside the absorption tower, and a defoaming device for adding defoaming agent to the foam; wherein the double-float foam measuring level gauge includes two floats of different densities.

7. The automatic detection and defoaming treatment equipment for slurry foam inside an absorption tower according to claim 6, characterized in that: The defoaming device includes a defoaming agent storage tank arranged outside the absorption tower for storing defoaming agent, a defoaming agent spraying mechanism arranged inside the absorption tower for spraying the defoaming agent, and a defoaming agent spraying metering pump for pumping the defoaming agent in the defoaming agent storage tank to the defoaming agent spraying mechanism; the defoaming agent spraying metering pump is connected to the control host.

8. The automatic detection and defoaming treatment equipment for slurry foam inside an absorption tower according to claim 7, characterized in that: The defoaming agent spraying mechanism includes a frame and a plurality of nozzles arranged on the frame; the frame is a disc structure, an interface is provided in the middle of the frame, the frame includes a ring coaxially arranged with the interface and a plurality of spokes arranged between the interface and the ring and distributed radially; a plurality of nozzles are respectively arranged on the ring and the spokes; one end of the interface is connected to the nozzle, and the other end of the interface is connected to the outlet of the defoaming agent spray metering pump.

9. The automatic detection and defoaming treatment equipment for slurry foam inside an absorption tower according to claim 8, characterized in that: The interface is connected to the outlet of the defoamer spray metering pump through a hose; the frame is a floating frame, which floats on the slurry surface inside the absorption tower; the nozzle is arranged at the upper end of the floating frame, and the nozzle sprays the defoamer upward on the foam.

10. The automatic detection and defoaming treatment equipment for slurry foam inside an absorption tower according to claim 6, characterized in that: The double-float foam measuring level gauge is installed inside the absorption tower, and includes a Hall position sensor, a connecting rod arranged between the Hall position sensor and each of the floats, the upper end of the connecting rod is slidably connected to the Hall position sensor, and the lower end of the connecting rod is fixedly connected to the float; the Hall position sensor is connected to the control host.

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