Double-pH partition spraying desulfurizing tower

Abstract

The utility model relates to the technical field of spray desulfurization towers, and discloses a double-pH partition spray desulfurization tower which comprises a tower body and a circulating unit, the tower body comprises a tower body and a tower kettle, a spray unit is arranged in the tower body, and the double-pH partition spray desulfurization tower further comprises a pH adjusting unit; a partition inclined plate is also arranged in the tower kettle and divides the tower kettle into an upper layer area and a lower layer area; a first detection module and a second detection module are also arranged on the tower kettle; a mixer is arranged on the circulating unit, and the pH regulating unit is used for conveying a pH regulator into the mixer. The tower kettle is divided into the upper-layer area and the lower-layer area which are communicated up and down by the partition inclined plate, the pH value of the upper-layer area is adjusted by the pH adjusting unit, so that the pH value of the upper-layer area is maintained to be lower than 7, the oxidation efficiency of the upper-layer area is improved, precipitation of calcium sulfate is facilitated under the action of the partition inclined plate, and the oxidation efficiency is improved. Meanwhile, the slurry in the lower-layer area is mixed with the pH regulator in the mixer during circulation, so that the pH value of the slurry in the lower-layer area is increased, and the desulfurization effect is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spray desulfurization tower technical field, concretely relates to a double pH partition spray desulfurization tower. BACKGROUND

[0002] The desulfurization tower is a kind of equipment for removing sulfur dioxide from industrial waste gas, and is widely applied to thermal power plant, chemical plant and other industries of discharging sulfur dioxide. Its main purpose is to reduce the emission of sulfur oxides to meet environmental regulations and improve air quality.

[0003] CN106621714B discloses a single-tower double-zone desulfurization system, relates to the technical field of desulfurization equipment, and includes a desulfurization tower body with a slurry pool at the bottom, a spraying zone in the middle and a demisting zone at the top, the slurry pool is also provided with an absorption zone and an oxidation zone, the pH value of the oxidation zone is less than that of the absorption zone, the absorption zone and the oxidation zone are isolated by a partition mechanism, and a driving mechanism is further included, which drives the partition mechanism to move to connect the absorption zone and the oxidation zone.

[0004] The above technical scheme sets absorption zone and oxidation zone in slurry pool, absorption zone high pH value completes absorption of sulfur dioxide in flue gas, generates calcium sulfite or calcium bisulfite, and the generated calcium sulfite or calcium bisulfite is transported to lower oxidation zone by partition mechanism, and low pH value in oxidation zone generates gypsum by oxidation of sulfite or bisulfite and finally crystallization, so that the utilization rate of absorbent is high, and the purity of gypsum is highest. However, the above technical scheme does not have a device for automatically adjusting the pH value of the oxidation zone, so that the pH value of the absorption zone in the tower is difficult to maintain at 5.5-6.5, and the pH value of the oxidation zone is difficult to maintain at 4.8-5.5. Moreover, the above technical scheme does not have a circulation unit, so that absorbent needs to be continuously transported into the tower, increasing the amount of absorbent. UTILITY MODEL CONTENTS

[0005] The utility model discloses a double pH partition spray desulfurization tower, and the desulfurization tower separates the tank from top to bottom into upper layer zone and lower layer zone by partitioning inclined plate, adjusts the pH of upper layer zone by pH adjusting unit, maintains the pH of upper layer zone below 7, improves the oxidation efficiency of upper layer zone, and under the action of partitioning inclined plate, the precipitation of calcium sulfate is facilitated, and the pH of slurry in lower layer zone is improved by mixing with pH regulator in mixer when circulating, so that the desulfurization effect is ensured.

[0006] To achieve the above object, the present application provides the following technical scheme:

[0007] A double pH partition spray desulfurization tower, including tower body, circulation unit, the tower body includes tower body and tank, the tower body is equipped with spraying unit, and the circulation unit is used for transporting slurry in the tank to the spraying unit, further including pH adjusting unit.

[0008] The tower kettle is further provided with a partitioned inclined plate, which separates the tower kettle into an upper layer region and a lower layer region in communication with each other; the tower kettle is further provided with a first detection module for detecting the pH value of the upper layer region and a second detection module for detecting the pH value of the lower layer region;

[0009] The circulation unit is provided with a mixer, and the pH adjusting unit is used for delivering a pH adjusting agent into the mixer; the pH adjusting unit is provided with a first adjusting valve, and the first adjusting valve controls the opening degree according to the pH value of the first detection module and the pH value of the second detection module, so that the pH of the upper layer region is maintained below 7.

[0010] Preferably, the tower body is further provided with a gas delivery pipe, and the output end of the gas delivery pipe is located in the upper layer region; the gas delivery pipe is used for delivering oxygen to the upper layer region.

[0011] Preferably, the circulation unit comprises a circulation pipeline, a valve connected to the circulation pipeline, and a circulation pump; the valve, the circulation pump, and the mixer are arranged along the delivery direction of the circulation pipeline.

[0012] Preferably, the pH adjusting unit comprises a first delivery pipe, and the first adjusting valve is arranged on the first delivery pipe; one end of the first delivery pipe is connected to an externally arranged pH adjusting agent delivery tank, and the other end is connected to the mixer.

[0013] Preferably, the system further comprises a desulfurizing agent delivery unit, and the desulfurizing agent delivery unit comprises a second delivery pipe and a second adjusting valve connected to the second delivery pipe; one end of the second delivery pipe is connected to an externally arranged desulfurizing agent delivery tank, and the other end is connected to the tower kettle.

[0014] The first adjusting valve controls the opening degree according to the pH value of the first detection module.

[0015] The second adjusting valve controls the opening degree according to the pH value of the second detection module.

[0016] The first adjusting valve and the second adjusting valve cooperate to maintain the pH value of the upper layer region at 5-6.5 and the pH value of the lower layer region at 6.5-7.5.

[0017] Preferably, the first detection module and the second detection module are in communication connection with an externally arranged pH monitor, and the first detection module and the second detection module respectively transmit the pH signal of the upper layer region and the pH signal of the lower layer region to the pH monitor.

[0018] The first adjusting valve controls the opening degree according to the pH signal of the upper layer region transmitted by the pH monitor.

[0019] The second adjusting valve controls the opening degree according to the pH signal of the lower layer region transmitted by the pH monitor.

[0020] Preferably, the first detection module comprises a first liquid suction pipe, a first control valve, a first filter and a first pH measuring device, the first liquid suction pipe is communicated with the upper layer area, the first control valve, the first filter and the first pH measuring device are sequentially connected to the first liquid suction pipe and arranged in sequence along the liquid conveying direction of the first liquid suction pipe.

[0021] The second detection module comprises a second liquid suction pipe, a second control valve, a second filter and a second pH measuring device, the second liquid suction pipe is communicated with the lower layer area, the second control valve, the second filter and the second pH measuring device are sequentially connected to the second liquid suction pipe and arranged in sequence along the liquid conveying direction of the second liquid suction pipe.

[0022] The first pH measuring device and the second pH measuring device are in communication connection with a pH monitor of an external device.

[0023] Preferably, the spraying unit comprises a spraying pipe connected in the tower body and a plurality of spraying heads arranged on the spraying pipe, the spraying pipe and the spraying heads form a spraying layer, the spraying layer is at least two layers, and the circulating unit conveys the slurry in the tower kettle to the spraying pipe of each spraying layer.

[0024] Preferably, a demisting unit is further arranged in the tower body, the demisting unit is located above the spraying unit, and the demisting unit is a demister.

[0025] Compared with the prior art, the application has the following beneficial effects:

[0026] The application separates the tower kettle into the upper layer area and the lower layer area which are communicated with each other by the partitioned inclined plate, adjusts the pH of the upper layer area by the pH adjusting unit, maintains the pH value of the upper layer area below 7, improves the oxidation efficiency of the upper layer area, and is beneficial to the precipitation of calcium sulfate under the action of the partitioned inclined plate. Meanwhile, the slurry in the lower layer area is mixed with the pH adjusting agent in the mixer during circulation, the pH value of the slurry in the lower layer area is improved, and the desulfurization effect is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 is a schematic diagram of the pipeline of the double-pH partitioned spray desulfurization tower of Example 1;

[0028] Fig. 2 is a schematic diagram of the pipeline of the circulating unit of the double-pH partitioned spray desulfurization tower of Example 1;

[0029] Fig. 3 is a schematic diagram of the pipeline of the desulfurizing agent conveying unit of the double-pH partitioned spray desulfurization tower of Example 1;

[0030] Fig. 4 is a schematic diagram of the pipeline of the pH adjusting unit of the double-pH partitioned spray desulfurization tower of Example 1;

[0031] Fig. 5is a piping schematic diagram of the first detection module and the second detection module of the double-pH zoned spray desulfurization tower of Example 1;

[0032] Wherein, each reference numeral is as follows:

[0033] tower body 1; circulating unit 2; desulfurizer conveying unit 3; pH adjusting unit 4; tower body 11; tower kettle 12; circulating pipeline 21; valve 22; circulating pump 23; mixer 24; second conveying pipe 31; second adjusting valve 32; first conveying pipe 41; first adjusting valve 42; spraying unit 111; demisting unit 112; zoned baffle 121; upper zone 122; lower zone 123; first detection module 124; second detection module 125; gas conveying pipe 126; spraying pipe 1111; spraying head 1112; first liquid suction pipe 1241; first control valve 1242; first filter 1243; first pH measuring device 1244; second liquid suction pipe 1251; second control valve 1252; second filter 1253; second pH measuring device 1254. DETAILED DESCRIPTION

[0034] 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 of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0035] Example 1

[0036] Reference Figs. 1-5 A double-pH zoned spray desulfurization tower, comprising a tower body 1, a circulating unit 2, the tower body 1 comprising a tower body 11 and a tower kettle 12, the tower body 11 being provided with a spraying unit 111, the circulating unit 2 being used for conveying slurry in the tower kettle 12 to the spraying unit 111, further comprising a pH adjusting unit 4;

[0037] The tower kettle 12 is further provided with a zoned baffle 121, the zoned baffle 121 separating the tower kettle 12 into an upper zone 122 and a lower zone 123 in communication with each other; the tower kettle 12 is further provided with a first detection module 124 for detecting the pH value of the upper zone 122 and a second detection module 125 for detecting the pH value of the lower zone 123;

[0038] The circulating unit 2 is provided with a mixer 24, the pH adjusting unit 4 is used for conveying a pH adjusting agent to the mixer 24, the pH adjusting unit 4 is provided with a first adjusting valve 42, the first adjusting valve 42 controls the opening degree according to the pH value of the first detection module 124 and the pH value of the second detection module 125, so that the pH of the upper zone 122 is maintained below 7.

[0039] In this design, in the process of desulfurization, the pH value of the upper zone 122 is detected by the first detection module 124, and the pH value of the lower zone 123 is detected by the second detection module 125; when the pH value of the upper zone 122 is higher than the preset value, the opening of the first regulating valve 42 is adjusted according to the pH value of the first detection module 124 and the pH value of the second detection module 125, so that the pH value of the upper zone 122 is reduced, and at the same time, the mixed slurry formed by the pH adjuster and the slurry in the lower zone 123 in the mixer 24 is alkaline, so that the desulfurization effect is ensured, and the oxidation of calcium sulfite in the upper zone 122 is promoted.

[0040] When the pH value of the lower zone 123 is lower than the preset value, the opening of the first regulating valve 42 is adjusted according to the pH value of the first detection module 124 and the pH value of the second detection module 125, so that the pH value of the slurry mixed with the pH adjuster in the lower zone 123 is increased, and the desulfurization effect is ensured.

[0041] In this way, the pH values of the upper zone 122 and the lower zone 123 can be controlled, the oxidation efficiency of the upper zone 122 is improved, and the desulfurization efficiency is also improved. At the same time, the partitioning inclined plate 121 is arranged in the tower kettle 12 at a certain inclination angle, so that the precipitate in the tower kettle 12 is precipitated downward from the upper zone 122 to the lower zone 123 under the action of gravity, and the slurry in the lower zone 123 is prevented from returning to the upper zone 122 and mixing with the slurry.

[0042] Implicitly, the tower body 11 is also provided with an air inlet and an air outlet for inputting sulfur dioxide and discharging desulfurized gas, and the tower kettle 12 is also provided with a discharge port for discharging calcium sulfate precipitate.

[0043] The pH adjuster mentioned in this embodiment can be a mixture of limestone and water, alkali residue white mud, etc.

[0044] In this embodiment, the tower body 1 is also provided with a gas conveying pipe 126, and the output end of the gas conveying pipe 126 is located in the upper zone 122. The gas conveying pipe 126 is used for conveying oxygen to the upper zone 122. Specifically, the gas conveying pipe 126 is used for inputting oxygen into the upper zone 122, and in combination with the low-pH environment of the upper zone 122, the calcium sulfite is converted into calcium sulfate.

[0045] In this embodiment, the circulating unit 2 includes a circulating pipeline 21, a valve 22 connected to the circulating pipeline 21, and a circulating pump 23. The valve 22, the circulating pump 23, and the mixer 24 are arranged along the conveying direction of the circulating pipeline 21.

[0046] In actual work, the slurry in the lower zone 123 is pumped into the circulating pipeline 21 under the action of the circulating pump 23, and is mixed with the desulfurizer in the mixer 24 to form mixed slurry, so as to increase the pH value of the lower slurry.

[0047] In the embodiment, the pH adjusting unit 4 comprises a first conveying pipe 41, and a first adjusting valve 42 is arranged on the first conveying pipe 41. One end of the first conveying pipe 41 is connected with an external pH adjusting agent conveying tank, and the other end is connected with the mixer 24. In use, the pH adjusting agent is conveyed into the first conveying pipe 41 from the external pH adjusting agent conveying tank, and is conveyed into the mixer 24 through the first conveying pipe 41.

[0048] Further, the desulfurizer conveying unit 3 is further included, and the desulfurizer conveying unit 3 comprises a second conveying pipe 31 and a second adjusting valve 32 connected with the second conveying pipe 31. One end of the second conveying pipe 31 is connected with an external desulfurizer conveying tank, and the other end is connected with the tower kettle 12.

[0049] The first adjusting valve 42 controls the opening degree according to the pH value of the first detection module 124.

[0050] The second adjusting valve 32 controls the opening degree according to the pH value of the second detection module 125.

[0051] The first adjusting valve 42 and the second adjusting valve 32 cooperate to maintain the pH value of the upper zone 122 at 5-6.5 and the pH value of the lower zone 123 at 6.5-7.5.

[0052] In the embodiment, the desulfurizer can be a mixture of limestone and water.

[0053] In actual use, when the pH value of the lower zone 123 is lower than 6.5-7.5, the external desulfurizer conveying tank conveys the desulfurizer into the lower zone 123 through the second conveying pipe 31, so as to maintain the pH value of the lower zone 123 at 6.5-7.5. In the circulating process, the opening degree of the first conveying pipe 31 is unchanged, so as to ensure the desulfurization effect.

[0054] When the pH value of the upper zone 122 is higher than 5-6.5, the opening degree of the second adjusting valve is unchanged, and the opening degree of the first adjusting valve is reduced, so as to reduce the supplement amount of the pH adjusting agent in the circulating process. On the premise of ensuring the desulfurization effect, the pH value of the upper zone 122 is reduced.

[0055] Preferably, the first detection module 124 and the second detection module 125 are in communication connection with an external pH monitor, and the pH signal of the upper zone 122 and the pH signal of the lower zone 123 are transmitted to the pH monitor, respectively.

[0056] The first regulating valve 42 receives the pH signal of the upper layer 122 transmitted by the pH monitor to control the opening degree;

[0057] The second regulating valve 32 receives the pH signal of the lower layer 123 transmitted by the pH monitor to control the opening degree.

[0058] Specifically, the first detection module 124 transmits the pH value of the upper layer 122 to the pH monitor, and the pH monitor transmits the pH signal of the upper layer 122 to the first regulating valve 42 to control the opening degree of the first regulating valve 42; similarly, the second detection module 125 transmits the pH value of the lower layer 123 to the pH monitor, and the pH monitor transmits the pH signal of the lower layer 123 to the second regulating valve 32 to control the opening degree of the second regulating valve 32, so as to automatically and accurately control the pH value of the upper layer 122 and the pH value of the lower layer 123.

[0059] In the embodiment, the first detection module 124 comprises a first liquid suction pipe 1241, a first control valve 1242, a first filter 1243, and a first pH measuring device 1244, the first liquid suction pipe 1241 is connected to the upper layer 122, the first control valve 1242, the first filter 1243, and the first pH measuring device 1244 are connected to the first liquid suction pipe 1241 in sequence and arranged along the liquid conveying direction of the first liquid suction pipe 1241;

[0060] The second detection module 125 comprises a second liquid suction pipe 1251, a second control valve 1252, a second filter 1253, and a second pH measuring device 1254, the second liquid suction pipe 1251 is connected to the lower layer 123, the second control valve 1252, the second filter 1253, and the second pH measuring device 1254 are connected to the second liquid suction pipe 1251 in sequence and arranged along the liquid conveying direction of the second liquid suction pipe 1251;

[0061] The first pH measuring device 1244 and the second pH measuring device 1254 are communicatively connected to the pH monitor of the external device.

[0062] In actual use, the working principle and structure of the first detection module 124 and the second detection module 125 are completely same, and the first detection module 124 is described in the embodiment. When the pH value of the upper layer 122 needs to be detected, the slurry of the upper layer 122 is extracted through the first liquid suction pipe 1241, and filtered through the first filter 1243, so that the liquid enters the first pH measuring device 1244 for pH measurement, and the pH value of the upper layer 122 is obtained.

[0063] Preferably, the spraying unit 111 comprises a spraying pipe 1111 connected in the tower body 11, a plurality of spraying heads 1112 arranged on the spraying pipe 1111, the spraying pipe 1111 and the spraying heads 1112 form a spraying layer, the spraying layer is at least two layers, and the circulating unit 2 delivers the slurry in the tower kettle 12 into the spraying pipe 1111 of each spraying layer.

[0064] Further, the tower body 11 is also provided with a demisting unit 112, the demisting unit 112 is located above the spraying unit 111, and the demisting unit 112 is a demister.

[0065] Specifically, the spraying unit 111 and the demisting unit 112 have been disclosed in Chinese patent CN209155503U, so the structure and working principle of the spraying unit 111 and the demisting unit 112 will not be described in detail in this embodiment.

[0066] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements or modifications, these improvements or modifications should also be considered as the protection scope of the present application.

Claims

1. A dual pH zoned spray desulphurization tower comprising a tower body, a circulating unit, the tower body comprising a tower shell and a tower kettle, a spraying unit being arranged in the tower shell, the circulating unit being used to deliver slurry in the tower kettle to the spraying unit, characterized in that, Further comprising a pH adjusting unit; The tower kettle is further provided with a partitioned inclined plate, which separates the tower kettle into an upper layer region and a lower layer region in communication with each other; the tower kettle is further provided with a first detection module for detecting the pH value of the upper layer region and a second detection module for detecting the pH value of the lower layer region; The circulating unit is provided with a mixer, the pH adjusting unit is used for delivering a pH adjusting agent into the mixer, the pH adjusting unit is provided with a first adjusting valve, and the first adjusting valve controls the opening degree according to the pH value of the first detection module and the pH value of the second detection module, so that the pH of the upper layer region is maintained below 7.

2. The dual pH zoned spray desulfurization tower of claim 1, wherein, The tower body is further provided with a gas delivery pipe, and the output end of the gas delivery pipe is located in the upper layer region, and the gas delivery pipe is used for delivering oxygen to the upper layer region.

3. The dual pH zoned spray desulfurization tower of claim 1, wherein, The circulating unit comprises a circulating pipeline, a valve connected to the circulating pipeline and a circulating pump, and the valve, the circulating pump and the mixer are arranged along the delivery direction of the circulating pipeline.

4. The dual pH zoned spray desulfurization tower of claim 1, wherein, The pH adjusting unit comprises a first delivery pipe, the first adjusting valve is arranged on the first delivery pipe, one end of the first delivery pipe is connected to an externally arranged pH adjusting agent delivery tank, and the other end of the first delivery pipe is connected to the mixer.

5. The dual pH zoned spray desulfurization tower of claim 1, wherein, Further comprising a desulfurizer delivery unit, the desulfurizer delivery unit comprises a second delivery pipe and a second adjusting valve connected to the second delivery pipe, one end of the second delivery pipe is connected to an externally arranged desulfurizer delivery tank, and the other end of the second delivery pipe is connected to the tower kettle; The first adjusting valve controls the opening degree according to the pH value of the first detection module; The second adjusting valve controls the opening degree according to the pH value of the second detection module; The first adjusting valve and the second adjusting valve cooperate to maintain the pH value of the upper layer region at 5-6.5 and the pH value of the lower layer region at 6.5-7.

5.

6. The dual pH zoned spray desulfurization tower of claim 5, wherein, The first detection module and the second detection module are in communication connection with an externally arranged pH monitor, and the pH signal of the upper layer region and the pH signal of the lower layer region are transmitted to the pH monitor, respectively; The first adjusting valve controls the opening degree according to the pH signal of the upper layer region transmitted by the pH monitor; The second adjusting valve controls the opening degree according to the pH signal of the lower layer region transmitted by the pH monitor.

7. The dual pH zoned spray desulfurization tower of claim 6, wherein, The first detection module comprises a first liquid suction pipe, a first control valve, a first filter and a first pH measuring device, the first liquid suction pipe is in communication with the upper layer region, the first control valve, the first filter and the first pH measuring device are connected to the first liquid suction pipe in sequence and arranged along the liquid delivery direction of the first liquid suction pipe; The second detection module comprises a second liquid suction pipe, a second control valve, a second filter and a second pH measuring device, the second liquid suction pipe is in communication with the lower layer region, the second control valve, the second filter and the second pH measuring device are connected to the second liquid suction pipe in sequence and arranged along the liquid delivery direction of the second liquid suction pipe; The first pH measuring device and the second pH measuring device are in communication connection with an externally arranged pH monitor.

8. The dual pH zoned spray desulfurization tower of claim 1, wherein, The spraying unit comprises a spraying pipe connected in the tower body and a plurality of spraying heads arranged on the spraying pipe, the spraying pipe and the spraying heads form a spraying layer, the spraying layer is at least two layers, and the circulating unit delivers the slurry in the tower kettle into the spraying pipe of each spraying layer.

9. The dual pH zoned spray desulfurization tower of claim 1, wherein, The tower body is further provided with a demisting unit, which is located above the spraying unit and is a demister. The tower body is further provided with a demisting unit, which is located above the spraying unit and is a demister.

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