An energy-saving and highly efficient desulfurization process using a spiral small nozzle

Abstract

The present invention relates to an energy-saving and highly efficient desulfurization process using a spiral small nozzle, and particularly relates to the technical field of desulfurization. It includes: the control module determines whether the initial flow rate is qualified based on the obtained initial flow rate, and determines the opening value of the first valve when it is unqualified; the original flue gas enters the first flue gas heat exchanger for heat exchange, and the control module determines the starting power of the liquid pump according to the obtained content of sulfur oxides to perform the first spraying on the original flue gas; when the first spraying is completed, the control module determines whether the sulfur oxides in the original flue gas are completely removed based on the obtained weight of gypsum. When they are not completely removed, the starting power of the liquid pump is adjusted, and at the same time, it is determined to open the third valve for the second spraying; when the second spraying is completed, the condensing demister performs gas-liquid separation on the original flue gas; when the desulfurization tower completes the desulfurization of the original flue gas, the clean flue gas enters the second flue gas heat exchanger again along the pipeline for temperature increase and then is discharged from the chimney; thereby improving the desulfurization efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of desulfurization, and particularly to an energy-saving and efficient desulfurization process using spiral small nozzles. Background Art

[0002] In order to effectively reduce the emission of sulfides in flue gas, factories have adopted different desulfurization devices and processes to treat flue gas to reduce environmental pollution. Currently, there are mainly two categories: wet desulfurization and dry desulfurization for desulfurizing flue gas.

[0003] Chinese Patent Publication No.: CN106039975A discloses a calcium-based wet desulfurization process, including a flue gas system, an absorbent slurry preparation system, a gypsum dehydration system, and a wastewater treatment system. The flue gas system includes a desulfurization tower and a heat exchanger. The heat exchanger is located near the purified flue gas outlet of the desulfurization tower. A raw flue gas inlet and a raw flue gas outlet are provided on both sides of the heat exchanger. The raw hot flue gas enters the desulfurization tower from the raw flue gas inlet, and the purified flue gas is reheated using the waste heat of the flue gas to increase the discharge capacity of the purified flue gas outlet; after being treated by the wastewater treatment system, a part of the water is used as industrial water for preparing the absorbent slurry, and the other part returns to the slurry tank of the desulfurization tower. On the one hand, it makes the slurry flow and circulate continuously to prevent caking and blockage. On the other hand, it effectively ensures that the chloride ions in the slurry of the desulfurization tower do not concentrate, extending the service life of the equipment. Thus, the calcium-based wet desulfurization process has the problem of low desulfurization efficiency due to the lack of precise control of the process flow. Summary of the Invention

[0004] Therefore, the present invention provides an energy-saving and efficient desulfurization process using spiral small nozzles to overcome the problem of low desulfurization efficiency caused by the lack of precise control of the process flow in the prior art.

[0005] To achieve the above object, the present invention provides an energy-saving and efficient desulfurization process using spiral small nozzles, including:

[0006] Step S1: The acquisition module of the controller acquires the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor. The control module of the controller determines whether the initial flow rate is qualified according to the comparison result between the initial flow rate and the preset flow rate, and determines the opening value of the first valve when it is unqualified;

[0007] Step S2: The raw flue gas enters the first flue gas heat exchanger for heat exchange. The acquisition module acquires the content of sulfur oxides detected by the flue gas analyzer. The control module determines the starting power of the liquid pump according to the content of sulfur oxides, and determines whether to correct the initial slurry ratio according to the ratio of the content of sulfur oxides to the standard content of sulfur oxides, and performs the first spray on the raw flue gas when the correction is completed;

[0008] Step S3: When the first spraying is completed, the acquisition module acquires the weight of the gypsum detected by the weighing sensor. The control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result between the weight of the gypsum and the standard gypsum weight. When not completely removed, it adjusts the starting power of the liquid pump according to the weight difference between the gypsum weight and the standard gypsum weight, and at the same time determines the opening value of the third valve to perform the second spraying on the raw flue gas;

[0009] Step S4: When the second spraying is completed, the condensing demister separates the gas and liquid of the raw flue gas. The acquisition module acquires the distribution rate of the droplets larger than 15um detected by the spray laser particle size analyzer. The control module determines whether the demisting is qualified according to the distribution rate. When unqualified, it opens the fourth valve to wash the condensing demister;

[0010] Step S5: When the desulfurization of the raw flue gas by the desulfurization tower is completed, the clean flue gas enters the second flue gas heat exchanger again along the pipeline to be heated and then discharged from the chimney.

[0011] Further, in step S1, when the acquisition module finishes acquiring the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor, the analysis module of the controller acquires the initial flow rate L of the raw flue gas, and compares the initial flow rate L with the preset flow rate L1. The control module determines whether the initial flow rate of the raw flue gas is qualified according to the comparison result.

[0012] If L ≤ L1, the control module determines that the initial flow rate of the raw flue gas is qualified;

[0013] If L > L1, the control module determines that the initial flow rate of the raw flue gas is unqualified.

[0014] Further, when the control module determines that the initial flow rate of the raw flue gas is unqualified, the analysis module calculates the flow rate difference ΔL between the initial flow rate L of the raw flue gas and the preset flow rate L1, sets ΔL = L - L1, and compares the flow rate difference with the preset flow rate difference. The control module determines the opening value of the first valve according to the comparison result.

[0015] Among them, the control module is provided with a first preset flow rate difference ΔL1, a second preset flow rate difference ΔL2, a first opening value B1, a second opening value B2, and a third opening value B3. Among them, ΔL1 < ΔL2, B1 < B2 < B3.

[0016] If ΔL ≤ ΔL1, the control module determines that the opening value of the first valve is B3;

[0017] If ΔL1 < ΔL ≤ ΔL2, the control module determines that the opening value of the first valve is B2;

[0018] If ΔL > ΔL2, the control module determines that the opening value of the first valve is B1.

[0019] Further, in step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module determines the content N of sulfur oxides and compares the content of sulfur oxides with the preset content of sulfur oxides. The control module determines the starting power of the liquid pump according to the comparison result.

[0020] Among them, the control module is provided with a first preset content N1, a second preset content N2, a first starting power P1, a second starting power P2, and a third starting power P3, where N1 < N2 and P1 < P2 < P3.

[0021] If N ≤ N1, the control module determines that the starting power of the liquid pump is P1.

[0022] If N1 < N ≤ N2, the control module determines that the starting power of the liquid pump is P2.

[0023] If N > N2, the control module determines that the starting power of the liquid pump is P3.

[0024] Further, in step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module calculates the ratio W of the content N of sulfur oxides to the standard content Nb of sulfur oxides, sets W = N / Nb, and compares the ratio W with the preset ratio W1. The control module determines whether to correct the initial slurry ratio according to the comparison result.

[0025] If W ≤ W1, the control module determines not to correct the initial slurry ratio.

[0026] If W > W1, the control module determines to correct the initial slurry ratio.

[0027] Further, when the control module determines to correct the initial slurry ratio, the analysis module calculates the first difference ΔW between the ratio and the preset ratio, sets ΔW = W - W1, and the control module corrects the initial slurry ratio according to the first difference. The corrected slurry ratio is set as V1, and V1 = V0 × Xi is set, where V0 is the initial slurry ratio and Xi is the correction coefficient of the slurry ratio. Set i = 1, 2, 3.

[0028] Further, in step S3, when the acquisition module finishes acquiring the weight of gypsum detected by the weighing sensor, the analysis module compares the weight G of gypsum with the standard weight Gb of gypsum, and the control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result.

[0029] If G < Gb, the control module determines that the sulfur oxides in the raw flue gas are not completely removed;

[0030] If G ≥ Gb, the control module determines that the sulfur oxides in the raw flue gas are completely removed.

[0031] Further, in the step S3, when the control module determines that the sulfur oxides in the raw flue gas are not completely removed, the analysis module calculates the weight difference ΔG between the gypsum weight G and the standard gypsum weight Gb, sets ΔG = Gb - G, and the control module adjusts the starting power of the liquid pump according to this weight difference, and sets the power of the adjusted liquid pump to P4, sets P4 = Pj × Ku, where Ku is the adjustment coefficient of the liquid pump power, and sets j = 1, 2, 3, u = 1, 2, 3.

[0032] Further, in the step S3, when the control module determines that the sulfur oxides in the raw flue gas are not completely removed, the analysis module compares the gypsum weight difference with a preset weight difference, and the control module determines the opening value of the third valve according to the comparison result. Among them, the control module is also provided with a first opening value Q1, a second opening value Q2, and a third opening value Q3, where Q1 < Q2 < Q3.

[0033] If ΔG ≤ ΔG1, the control module determines that the opening value of the third valve is Q1;

[0034] If ΔG1 < ΔG ≤ ΔG2, the control module determines that the opening value of the third valve is Q2;

[0035] If ΔG > ΔG2, the control module determines that the opening value of the third valve is Q3.

[0036] Further, in the step S4, when the condensing demister completes the gas-liquid separation of the raw flue gas, the acquisition module acquires the distribution rate of the droplets larger than 15um detected by the spray laser particle size analyzer, the analysis module determines the distribution rate E of the droplets larger than 15um, and compares the distribution rate E of the droplets with a preset distribution rate E1, and the control module determines whether the demisting of the condensing demister is qualified according to the comparison result.

[0037] If E < E1, the control module determines that the demisting of the condensing demister is qualified;

[0038] If E ≥ E1, the control module determines that the demisting of the condensing demister is unqualified;

[0039] When the control module determines that the demisting of the condensing demister is unqualified, the analysis module calculates the distribution rate difference ΔE between the droplet distribution law E and the preset droplet distribution rate E1, sets ΔE = E - E1, and compares this distribution rate difference with the preset distribution rate difference. The control module determines the opening value of the fourth valve according to the result.

[0040] Among them, the control module is provided with a first preset distribution rate difference ΔE1, a second distribution rate difference ΔE2, a first opening value R1, a second opening value R2, and a third opening value R3. Among them, ΔE1 < ΔE2, R1 < R2 < R3.

[0041] If ΔE ≤ ΔE1, the control module determines that the opening value of the fourth valve is R1.

[0042] If ΔE1 < ΔE ≤ ΔE2, the control module determines that the opening value of the fourth valve is R2.

[0043] If ΔE > ΔE2, the control module determines that the opening value of the fourth valve is R3.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows: By monitoring the initial flow rate of the raw flue gas with a flue gas flow rate monitor and comparing it with the preset flow rate to analyze the flow rate of the raw flue gas. When the flow rate is too fast, the control module controls the first valve to reduce the opening value to reduce the flow rate of the raw flue gas, so as to ensure that the raw flue gas can fully react with the slurry when entering the desulfurization tower, and further improve the desulfurization efficiency.

[0045] Furthermore, the present invention detects the content of sulfur oxides in the flue gas through a flue gas analyzer, compares it with the preset content of sulfur oxides, and determines the starting power of the liquid pump according to the comparison result to select an appropriate power to spray the raw flue gas, further precisely controlling the process flow and further improving the desulfurization efficiency.

[0046] Furthermore, the present invention sets the content of sulfur oxides that can completely react with the initial slurry ratio as the standard sulfur oxide content, calculates the ratio of the detected content of sulfur oxides entering the desulfurization tower to the standard sulfur oxide content, and compares this ratio with the preset ratio to determine whether to correct the initial slurry ratio, further improving the accuracy of controlling the process flow.

[0047] In particular, when it is determined to correct the initial slurry ratio, a corresponding correction coefficient is selected according to the comparison result of the first difference and the preset difference to correct the initial slurry ratio, so as to spray the corresponding slurry ratio according to different concentrations of sulfur oxides to make the desulfurization effect better and further improve the desulfurization efficiency.

[0048] Furthermore, the present invention detects the weight of the precipitate formed by the reaction of the slurry with sulfur oxides, i.e., gypsum, and compares it with the standard weight of gypsum, thereby determining whether the sulfur oxides in the raw flue gas have been completely removed. When they have not been completely removed, the starting power of the liquid pump is adjusted and the opening value of the third valve is determined simultaneously to perform a second spraying on the raw flue gas, further improving the desulfurization efficiency.

[0049] Furthermore, when the gas-liquid separation in the condensing demister is completed, the present invention detects the distribution rate of droplets larger than 15 μm, thereby determining whether the demisting of the demister is qualified. When it is unqualified, the fourth valve is opened to wash the condensing demister to remove the droplets and the solid substances that may be contained in the droplets, further improving the desulfurization efficiency.

[0050] Furthermore, the first sprayer, the second sprayer, and the third sprayer of the present invention all use a number of spiral small nozzles to spray the raw flue gas. The liquid droplets are small, the reaction specific surface area is large, and the mass transfer speed is fast, further improving the atomization effect of the sprayer and further improving the desulfurization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 is the flow chart of the energy-saving and high-efficiency desulfurization process using the spiral small nozzles;

[0052] Figure 2 is the structural diagram of the energy-saving and high-efficiency desulfurization process using the spiral small nozzles;

[0053] Figure 3 is the logic block diagram of the controller of the energy-saving and high-efficiency desulfurization process using the spiral small nozzles. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] In order to make the objectives and advantages of the present invention clearer, the present invention will be further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and do not limit the protection scope of the present invention.

[0056] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0057] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] Please refer to Figure 1 as shown in Figure 1 which is the flow chart of the energy-saving and high-efficiency desulfurization process of the spiral small nozzle.

[0059] In an embodiment of the present invention, an energy-saving and high-efficiency desulfurization process using a spiral small nozzle includes:

[0060] Step S1: The acquisition module of the controller acquires the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor. The control module of the controller determines whether the initial flow rate is qualified according to the comparison result between the initial flow rate and the preset flow rate, and determines the opening value of the first valve when it is unqualified.

[0061] Step S2: The raw flue gas enters the first flue gas heat exchanger for heat exchange. The acquisition module acquires the content of sulfur oxides detected by the flue gas analyzer. The control module determines the starting power of the liquid pump according to the content of sulfur oxides, and determines whether to correct the initial slurry ratio according to the ratio of the content of sulfur oxides to the standard content of sulfur oxides, and performs the first spraying on the raw flue gas when the correction is completed.

[0062] Step S3: When the first spraying is completed, the acquisition module acquires the weight of the gypsum detected by the weighing sensor. The control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result between the weight of the gypsum and the standard weight of the gypsum. When it is not completely removed, the starting power of the liquid pump is adjusted according to the weight difference between the weight of the gypsum and the standard weight of the gypsum, and at the same time, the opening value of the third valve is determined to perform the second spraying on the raw flue gas.

[0063] Step S4: When the second spraying is completed, the condensing demister performs gas-liquid separation on the raw flue gas. The acquisition module acquires the distribution rate of the droplets larger than 15um detected by the spray laser particle size analyzer. The control module determines whether the demisting is qualified according to the distribution rate, and opens the fourth valve to wash the condensing demister when it is unqualified.

[0064] Step S5: When the desulfurization of the raw flue gas by the desulfurization tower is completed, the clean flue gas enters the second flue gas heat exchanger again along the pipeline for heating up and then is discharged from the chimney.

[0065] Specifically, in the step S1, when the acquisition module finishes acquiring the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor, the analysis module of the controller acquires the initial flow rate L of the raw flue gas, and compares this initial flow rate L with the preset flow rate L1. The control module determines whether the initial flow rate of the raw flue gas is qualified according to the comparison result.

[0066] If L ≤ L1, the control module determines that the initial flow rate of the raw flue gas is qualified;

[0067] If L > L1, the control module determines that the initial flow rate of the raw flue gas is unqualified.

[0068] Specifically, when the control module determines that the initial flow rate of the raw flue gas is unqualified, the analysis module calculates the flow rate difference ΔL between the initial flow rate L of the raw flue gas and the preset flow rate L1, sets ΔL = L - L1, and compares this flow rate difference with the preset flow rate difference. The control module determines the opening value of the first valve according to the comparison result.

[0069] Among them, the control module is provided with a first preset flow rate difference ΔL1, a second preset flow rate difference ΔL2, a first opening value B1, a second opening value B2, and a third opening value B3. Among them, ΔL1 < ΔL2, B1 < B2 < B3.

[0070] If ΔL ≤ ΔL1, the control module determines that the opening value of the first valve is B3;

[0071] If ΔL1 < ΔL ≤ ΔL2, the control module determines that the opening value of the first valve is B2;

[0072] If ΔL > ΔL2, the control module determines that the opening value of the first valve is B1.

[0073] Specifically, in the step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module determines the content N of sulfur oxides, and compares this content of sulfur oxides with the preset content of sulfur oxides. The control module determines the starting power of the liquid pump according to the comparison result.

[0074] Among them, the control module is provided with a first preset content N1, a second preset content N2, a first starting power P1, a second starting power P2, and a third starting power P3. Among them, N1 < N2, P1 < P2 < P3.

[0075] If N ≤ N1, the control module determines that the starting power of the liquid pump is P1;

[0076] If N1 < N ≤ N2, the control module determines that the starting power of the liquid pump is P2;

[0077] If N > N2, the control module determines that the starting power of the liquid pump is P3.

[0078] Specifically, in the step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module calculates the ratio W of the content N of sulfur oxides to the content Nb of standard sulfur oxides, sets W = N / Nb, and compares this ratio W with a preset ratio W1. The control module determines whether to correct the initial slurry ratio according to the comparison result.

[0079] If W ≤ W1, the control module determines not to correct the initial slurry ratio.

[0080] If W > W1, the control module determines to correct the initial slurry ratio.

[0081] In the embodiment of the present invention, the content of the standard sulfur oxides is the content of sulfur oxides that can completely react with the initial slurry ratio.

[0082] Specifically, when the control module determines to correct the initial slurry ratio, the analysis module calculates the first difference ΔW between the ratio and the preset ratio, sets ΔW = W - W1, compares this first difference with a preset difference, and the control module selects a corresponding correction coefficient according to the comparison result to correct the initial slurry ratio.

[0083] Among them, a first preset difference ΔW1, a second preset difference ΔW2, a first correction coefficient X1, a second correction coefficient X2, and a third correction coefficient X3 are set in the control module, where ΔW1 < ΔW2, 1 < X1 < X2 < X3 < 1.2.

[0084] If ΔW ≤ ΔW1, the control module determines to select the first correction coefficient X1 to correct the initial slurry ratio.

[0085] If ΔW1 < ΔW ≤ ΔW2, the control module determines to select the second correction coefficient X2 to correct the initial slurry ratio.

[0086] If ΔW > ΔW2, the control module determines to select the third correction coefficient X3 to correct the initial slurry ratio.

[0087] When the control module determines to select the i-th correction coefficient Xi to correct the initial slurry ratio, the corrected slurry ratio is set to V1, and V1 = V0 × Xi is set, where V0 is the initial slurry ratio and Xi is the correction coefficient of the slurry ratio, and i = 1, 2, 3 is set.

[0088] In the embodiment of the present invention, during the first spraying, the control module controls the opening of the second valve and the closing of the third and fourth valves.

[0089] Specifically, in the step S3, when the acquisition module finishes acquiring the weight of the gypsum detected by the weighing sensor, the analysis module compares the weight G of the gypsum with the standard weight Gb of the gypsum, and the control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result.

[0090] If G < Gb, the control module determines that the sulfur oxides in the raw flue gas are not completely removed.

[0091] If G ≥ Gb, the control module determines that the sulfur oxides in the raw flue gas are completely removed.

[0092] In the embodiment of the present invention, the standard weight of the gypsum is the weight of the gypsum obtained by completely reacting the initial slurry ratio with the standard sulfur oxides.

[0093] Specifically, in the step S3, when the control module determines that the sulfur oxides in the raw flue gas are not completely removed, the analysis module calculates the weight difference ΔG between the weight G of the gypsum and the standard weight Gb of the gypsum, sets ΔG = Gb - G, compares this weight difference with the preset weight difference, and the control module selects the corresponding power adjustment coefficient according to the comparison result to adjust the starting power of the liquid pump.

[0094] Among them, the control module is provided with a first preset weight difference ΔG1, a second preset weight difference ΔG2, a first power adjustment coefficient K1, a second power adjustment coefficient K2, and a third power adjustment coefficient K3. Among them, ΔG1 < ΔG2, 1 < K1 < K2 < K3 < 1.5.

[0095] If ΔG ≤ ΔG1, the control module determines to select the first power adjustment coefficient K1 to adjust the starting power of the liquid pump.

[0096] If ΔG1 < ΔG ≤ ΔG2, the control module determines to select the second power adjustment coefficient K2 to adjust the starting power of the liquid pump.

[0097] If ΔG > ΔG2, the control module determines to select the third power adjustment coefficient K3 to adjust the starting power of the liquid pump.

[0098] When it is determined to select the u-th power adjustment coefficient Ku to adjust the starting power of the liquid pump, the power of the adjusted liquid pump is set to P4, and P4 = Pj × Ku is set, where Ku is the adjustment coefficient of the liquid pump power, and j = 1, 2, 3, u = 1, 2, 3.

[0099] Specifically, in the step S3, when the control module determines that the sulfur oxides in the raw flue gas are not completely removed, the analysis module compares the gypsum weight difference with a preset weight difference, and the control module determines the opening value of the third valve according to the comparison result. Among them, a first opening value Q1, a second opening value Q2, and a third opening value Q3 are also set in the control module, where Q1 < Q2 < Q3.

[0100] If ΔG ≤ ΔG1, the control module determines that the opening value of the third valve is Q1;

[0101] If ΔG1 < ΔG ≤ ΔG2, the control module determines that the opening value of the third valve is Q2;

[0102] If ΔG > ΔG2, the control module determines that the opening value of the third valve is Q3.

[0103] In the embodiment of the present invention, when the first spraying is completed, the control module controls the second valve to close, and when it is determined that the sulfur oxides in the raw flue gas are not completely removed, the control module adjusts the initial power of the liquid pump, and at the same time controls the third valve to open to perform a second spraying on the raw flue gas.

[0104] Specifically, in the step S4, when the condensing demister completes the gas-liquid separation of the raw flue gas, the acquisition module acquires the distribution rate of droplets larger than 15um detected by the spray laser particle size analyzer, the analysis module determines the distribution rate E of droplets larger than 15um, and compares the distribution rate E of the droplets with a preset distribution rate E1, and the control module determines whether the demisting of the condensing demister is qualified according to the comparison result.

[0105] If E < E1, the control module determines that the demisting of the condensing demister is qualified;

[0106] If E ≥ E1, the control module determines that the demisting of the condensing demister is unqualified.

[0107] Specifically, when the control module determines that the demisting of the condensing demister is unqualified, the analysis module calculates the distribution rate difference ΔE between the droplet distribution law E and the preset droplet distribution rate E1, sets ΔE = E - E1, and compares the distribution rate difference with a preset distribution rate difference, and the control module determines the opening value of the fourth valve according to the comparison result.

[0108] Among them, a first preset distribution rate difference ΔE1, a second distribution rate difference ΔE2, a first opening value R1, a second opening value R2, and a third opening value R3 are set in the control module, where ΔE1 < ΔE2, R1 < R2 < R3.

[0109] If ΔE ≤ ΔE1, the control module determines that the opening value of the fourth valve is R1;

[0110] If ΔE1 < ΔE ≤ ΔE2, the control module determines that the opening value of the fourth valve is R2;

[0111] If ΔE > ΔE2, the control module determines that the opening value of the fourth valve is R3.

[0112] Please refer to Figure 2 as shown Figure 2 which is the structural diagram of the energy-saving and high-efficiency desulfurization process of the spiral small nozzle.

[0113] In an embodiment of the present invention, an apparatus for the energy-saving and high-efficiency desulfurization process of a spiral small nozzle includes:

[0114] a boiler 1,

[0115] a first flue gas heat exchanger 2 for heat exchange is connected to the boiler 1 through a pipeline, and a flue gas flow velocity monitor 3 for monitoring the flow rate of the raw flue gas is arranged on the pipeline between the boiler 1 and the first flue gas heat exchanger 2;

[0116] the first flue gas heat exchanger 2 is connected to a desulfurization tower through a pipeline, and a first valve 4 for adjusting the flow rate of the raw flue gas and a flue gas analyzer 5 for detecting the sulfur oxide content are arranged between the desulfurization tower and the first flue gas heat exchanger 2,

[0117] wherein, a gypsum removal device 6 for containing gypsum is arranged at the bottom of the desulfurization tower, a weight sensor 7 for weighing the gypsum is arranged at the bottom of the gypsum removal device 6, a first sprayer 8 and a second sprayer 9 for spraying slurry are arranged above the gypsum removal device 6, the first sprayer 8 is arranged below the second sprayer 9, a slurry preparation device 10 for preparing slurry is connected between the first sprayer 8 and the second sprayer 9, a precision filtration device 11 for automatic filtration and a liquid pump 12 for adjusting the power are arranged between the slurry preparation device 10 and the first sprayer 8 and the second sprayer 9, a second valve 13 is connected between the slurry preparation device 10 and the first sprayer 8, a third valve 14 is connected between the slurry preparation device 10 and the second sprayer 9, a condensing demister 15 for gas-liquid separation is arranged above the second sprayer 9, a fourth valve 17 is connected between the condensing demister 15 and a flushing water tank 16, and a spray laser particle size analyzer 18 for detecting the distribution of the droplet particle size is arranged at the top of the desulfurization tower;

[0118] the desulfurization tower is connected to a second flue gas heat exchanger 19,

[0119] wherein, the first flue gas heat exchanger 2 and the second flue gas heat exchanger 19 are an integral body;

[0120] the second heat exchanger 19 is connected to an induced draft fan 20 for extracting clean flue gas through a pipeline;

[0121] The induced draft fan 20 is connected to a chimney 21 for discharging clean flue gas.

[0122] Please refer to Figure 3 as shown Figure 3 which is a logic block diagram of a controller of the energy-saving and highly efficient desulfurization process of the spiral small nozzle.

[0123] In an embodiment of the present invention, the controller (not shown in the figure) includes:

[0124] an acquisition module for acquiring the initial flow rate of the raw flue gas;

[0125] an analysis module connected to the acquisition module for analyzing and calculating the flow rate of the acquired raw flue gas;

[0126] a control module connected to the analysis module for adjusting the power of the liquid pump.

[0127] So far, the technical solution of the present invention has been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0128] The above are only the preferred embodiments of the present invention and are not used to limit the present invention; for those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A spiral small nozzle energy-saving and highly efficient desulfurization process, characterized in that, Including: Step S1: The acquisition module of the controller acquires the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor. The control module of the controller determines whether the initial flow rate is qualified according to the comparison result between the initial flow rate and the preset flow rate, and determines the opening value of the first valve when it is unqualified. Step S2: The raw flue gas enters the first flue gas heat exchanger for heat exchange. The acquisition module acquires the content of sulfur oxides detected by the flue gas analyzer. The control module determines the starting power of the liquid pump according to the content of sulfur oxides, and determines whether to correct the initial slurry ratio according to the ratio of the content of sulfur oxides to the standard content of sulfur oxides, and sprays the raw flue gas for the first time when the correction is completed. Step S3: When the first spraying is completed, the acquisition module acquires the weight of the gypsum detected by the weighing sensor. The control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result between the weight of the gypsum and the standard weight of the gypsum. When it is not completely removed, the starting power of the liquid pump is adjusted according to the weight difference between the weight of the gypsum and the standard weight of the gypsum, and the opening value of the third valve is determined to spray the raw flue gas for the second time. Step S4: When the second spraying is completed, the condensing demister separates the gas and liquid of the raw flue gas. The acquisition module acquires the distribution rate of the droplets larger than 15um detected by the spray laser particle size analyzer. The control module determines whether the demisting is qualified according to the distribution rate. When it is unqualified, the fourth valve is opened to wash the condensing demister. When the control module determines that the demisting of the condensing demister is unqualified, the analysis module of the controller calculates the distribution rate difference ΔE between the droplet distribution rate E and the preset droplet distribution rate E1, sets ΔE = E - E1 ≥ 0, and compares the distribution rate difference with the preset distribution rate difference. The control module determines the opening value of the fourth valve according to the comparison result. Wherein, a first preset distribution rate difference ΔE1, a second distribution rate difference ΔE2, a first opening value R1, a second opening value R2, and a third opening value R3 are set in the control module, wherein, ΔE1 < ΔE2, R1 < R2 < R3. If ΔE ≤ ΔE1, the control module determines that the opening value of the fourth valve is R1. If ΔE1 < ΔE ≤ ΔE2, the control module determines that the opening value of the fourth valve is R2. If ΔE > ΔE2, the control module determines that the opening value of the fourth valve is R3. Step S5: When the desulfurization of the raw flue gas by the desulfurization tower is completed, the clean flue gas enters the second flue gas heat exchanger again along the pipeline to be heated up and then discharged from the chimney.

2. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 1, characterized in that, In step S1, when the acquisition module completes acquiring the initial flow rate of the raw flue gas monitored by the flue gas flow rate monitor, the analysis module of the controller acquires the initial flow rate L of the raw flue gas, and compares the initial flow rate L with the preset flow rate L1. The control module determines whether the initial flow rate of the raw flue gas is qualified according to the comparison result. If L ≤ L1, the control module determines that the initial flow rate of the raw flue gas is qualified. If L > L1, the control module determines that the initial flow rate of the raw flue gas is unqualified.

3. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 2, characterized in that, When the control module determines that the initial flow rate of the raw flue gas is unqualified, the analysis module calculates the flow difference ΔL between the initial flow rate L of the raw flue gas and the preset flow rate L1, sets ΔL = L - L1, and compares this flow difference with the preset flow difference. The control module determines the opening value of the first valve according to the comparison result. Among them, the control module is set with a first preset flow difference ΔL1, a second preset flow difference ΔL2, a first opening value B1, a second opening value B2, and a third opening value B3. Among them, ΔL1 < ΔL2, B1 < B2 < B3. If ΔL ≤ ΔL1, the control module determines that the opening value of the first valve is B3. If ΔL1 < ΔL ≤ ΔL2, the control module determines that the opening value of the first valve is B2. If ΔL > ΔL2, the control module determines that the opening value of the first valve is B1.

4. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 3, characterized in that, In step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module determines the content N of sulfur oxides, and compares this content of sulfur oxides with the preset content of sulfur oxides. The control module determines the starting power of the liquid pump according to the comparison result. Among them, the control module is set with a first preset content N1, a second preset content N2, a first starting power P1, a second starting power P2, and a third starting power P3. Among them, N1 < N2, P1 < P2 < P3. If N ≤ N1, the control module determines that the starting power of the liquid pump is P1. If N1 < N ≤ N2, the control module determines that the starting power of the liquid pump is P2. If N > N2, the control module determines that the starting power of the liquid pump is P3.

5. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 4, characterized in that, In step S2, when the acquisition module finishes acquiring the content of sulfur oxides detected by the flue gas analyzer, the analysis module calculates the ratio W of the content N of sulfur oxides to the standard content Nb of sulfur oxides, sets W = N / Nb, and compares this ratio W with the preset ratio W1. The control module determines whether to correct the initial slurry ratio according to the comparison result. If W ≤ W1, the control module determines not to correct the initial slurry ratio. If W > W1, the control module determines to correct the initial slurry ratio.

6. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 5, characterized in that When the control module determines to correct the initial slurry ratio, the analysis module calculates the first difference ΔW between the ratio and the preset ratio, sets ΔW = W - W1. The control module corrects the initial slurry ratio according to this first difference, sets the corrected slurry ratio to V1, and sets V1 = V0 × Xi, where V0 is the initial slurry ratio and Xi is the correction coefficient of the slurry ratio. Set i = 1, 2, 3.

7. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 6, characterized in that, In step S3, when the acquisition module finishes acquiring the gypsum weight detected by the weighing sensor, the analysis module compares the gypsum weight G with the standard gypsum weight Gb. The control module determines whether the sulfur oxides in the raw flue gas are completely removed according to the comparison result. If G < Gb, the control module determines that the sulfur oxides in the raw flue gas are not completely removed. If G≥Gb, the control module determines that the sulfur oxides in the raw flue gas have been completely removed.

8. The energy-saving and highly efficient desulfurization process of the spiral small nozzle according to claim 7, characterized in that, In step S3, when the control module determines that the sulfur oxides in the raw flue gas have not been completely removed, the analysis module calculates the weight difference ΔG between the gypsum weight G and the standard gypsum weight Gb, sets ΔG = Gb - G, and the control module adjusts the starting power of the liquid pump according to this weight difference, and sets the power of the adjusted liquid pump to P4, where P4 = Pj×Ku, Ku is the adjustment coefficient of the liquid pump power, and j = 1, 2, 3, u = 1, 2, 3.

9. The energy-saving and high-efficiency desulfurization process of the spiral small nozzle according to claim 8, characterized in that, In step S3, when the control module determines that the sulfur oxides in the raw flue gas have not been completely removed, the analysis module compares the gypsum weight difference with a preset weight difference, and the control module determines the opening value of the third valve according to the comparison result. Among them, a first opening value Q1, a second opening value Q2, and a third opening value Q3 are also set in the control module, where Q1 < Q2 < Q3. If ΔG≤ΔG1, the control module determines that the opening value of the third valve is Q1; If ΔG1<ΔG≤ΔG2, the control module determines that the opening value of the third valve is Q2; If ΔG>ΔG2, the control module determines that the opening value of the third valve is Q3.

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