Calcium-based dry flue gas desulfurization system

Abstract

The invention discloses a calcium-based dry flue gas desulfurization system, which relates to the technical field of industrial desulfurization, is suitable for a gas power plant, and comprises a desulfurization reactor, a first desulfurizer storage bin, a first weighing feeder and a first heating device; the first desulfurizing agent storage bin is used for accommodating high-activity calcium hydroxide powder; the first weighing feeder is connected between the desulfurization reactor and the first desulfurizer storage bin and is used for conveying high-activity calcium hydroxide powder into the desulfurization reactor to react with sulfide; the first heating device is mounted in the first desulfurizing agent storage bin and is used for heating the high-activity calcium hydroxide powder. According to the technical scheme, the high-activity calcium hydroxide powder is heated by the first heating device mounted in the first desulfurizing agent storage bin, so that the high-activity calcium hydroxide powder is prevented from absorbing water and being hardened, and the desulfurizing efficiency of the system is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial desulfurization, and in particular to a calcium-based dry flue gas desulfurization system. Background Art

[0002] Post-combustion desulfurization, i.e. flue gas desulfurization in coal gas power plants, is currently the most widely used and most effective technology for controlling sulfur dioxide (SO2). According to the process characteristics, flue gas desulfurization technologies are divided into wet, semi-dry and dry methods. For coal gas power plants, the SO2 concentration and flue gas dust in the flue gas at the inlet of flue gas desulfurization are relatively low. Considering the economic and environmental aspects, flue gas desulfurization technology mostly uses dry flue gas desulfurization technology. At present, the most widely used dry desulfurization technology is sodium-based dry desulfurization technology.

[0003] However, due to the high cost of sodium-based desulfurization agents, the difficulty in handling byproducts, and the relatively harsh reaction temperature (140℃~250℃), sodium-based dry desulfurization is technically feasible, but decentralized disposal, the processing volume is too small, the cost of individual disposal is high, and the economics of centralized comprehensive disposal are not attractive. Therefore, the commercial application of sodium-based dry desulfurization byproducts is somewhat difficult.

[0004] At present, some enterprises tend to use calcium powder dry desulfurization technology. However, calcium powder desulfurizer easily absorbs water and hardens. In order to achieve a higher SO2 removal efficiency, a large amount of desulfurizer needs to be sprayed, which in turn leads to a low utilization rate of the desulfurizer. Summary of the invention

[0005] The main purpose of the present invention is to provide a calcium-based dry flue gas desulfurization system, aiming to provide a calcium-based dry flue gas desulfurization system that avoids desulfurization agent caking and improves the utilization rate of the desulfurization agent.

[0006] To achieve the above-mentioned purpose, the calcium-based dry flue gas desulfurization system proposed in the present invention is suitable for coal gas power plants. The calcium-based dry flue gas desulfurization system comprises:

[0007] Desulfurization reactor;

[0008] The first desulfurization agent storage bin is used to accommodate high-activity calcium hydroxide powder;

[0009] a first weighing feeder connected between the desulfurization reactor and the first desulfurization agent storage bin, for conveying high-activity calcium hydroxide powder into the desulfurization reactor to react with sulfide; and

[0010] The first heating device is installed in the first desulfurizing agent storage bin and is used to heat the high-activity calcium hydroxide powder.

[0011] In one embodiment, the calcium-based dry flue gas desulfurization system further includes a first fan, the first fan includes a first pipeline, and two ends of the first pipeline are respectively connected to the first fan outlet port and the air inlet port of the conveying device.

[0012] In one embodiment, a first nitrogen connection port and / or a second heating device are provided in the first pipeline.

[0013] In one embodiment, a first sensor is provided in the desulfurization reactor for detecting the concentration of sulfide in real time;

[0014] The discharge amount of the first weighing feeder is set in a positive correlation with the sulfide concentration.

[0015] In one embodiment, the calcium-based dry flue gas desulfurization system further comprises a sodium-based treatment device, wherein the sodium-based treatment device comprises:

[0016] A second desulfurizing agent storage bin is used to accommodate sodium bicarbonate particles; and

[0017] The grinder conveying device is connected between the desulfurization reactor and the second desulfurization agent storage bin, and is used for crushing the sodium bicarbonate particles and conveying them to the desulfurization reactor to react with sulfides.

[0018] In one embodiment, the calcium-based dry flue gas desulfurization system further comprises a dust removal device, which is arranged at the downstream port of the desulfurization reactor to collect reaction products;

[0019] A second sensor is arranged in the dust removal device for detecting the sulfide concentration in real time.

[0020] In one embodiment, the calcium-based dry flue gas desulfurization system further includes a waste recycling system, which is arranged at a downstream port of the dust removal device; the waste recycling system includes:

[0021] A calcium-based ash silo is used to contain calcium-based ash produced by the reaction of highly active calcium hydroxide powder and sulfide; and

[0022] The second weighing feeder is connected between the desulfurization reactor and the calcium-based ash bin, and is used for conveying calcium-based ash into the desulfurization reactor to react with sulfide.

[0023] In one embodiment, the waste recycling system further includes a third heating device installed in the calcium-based ash bin to heat the calcium-based ash.

[0024] In one embodiment, the waste recycling system further includes a second fan, the second fan includes a second pipeline, and two ends of the second pipeline are respectively connected to the air outlet port of the second fan and the air inlet port of the second weigh feeder.

[0025] In one embodiment, a second nitrogen connection port and / or a fourth heating device are provided in the second pipeline.

[0026] The technical solution of the present invention adopts the method of placing high-activity calcium hydroxide powder in the first desulfurizer storage bin, and then conveying the high-activity calcium hydroxide powder to the desulfurization reactor through the first weighing feeder connected between the desulfurization reactor and the first desulfurizer storage bin to react with sulfide, thereby completing the desulfurization process. The high-activity calcium hydroxide powder is heated by the first heating device installed in the first desulfurizer storage bin, thereby preventing the high-activity calcium hydroxide powder from absorbing moisture and becoming hardened, thereby further improving the desulfurization efficiency of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of an embodiment of a calcium-based dry flue gas desulfurization system provided by the present invention.

[0029] Description of Figure Numbers:

[0030] 100. Calcium-based dry flue gas desulfurization system; 1. Desulfurization reactor; 2. First desulfurization agent storage bin; 3. First weighing feeder; 4. First fan; 41. First pipeline; 5. Sodium-based treatment device; 51. Second desulfurization agent storage bin; 52. Grinding machine water supply device; 6. Dust removal device; 7. Waste recycling system; 71. Calcium-based ash bin; 72. Second weighing feeder; 73. Second fan; 731. Second pipeline.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0035] Post-combustion desulfurization, i.e. flue gas desulfurization in coal gas power plants, is currently the most widely used and most effective technology for controlling sulfur dioxide (SO2). According to the process characteristics, flue gas desulfurization technologies are divided into wet, semi-dry and dry methods. For coal gas power plants, the SO2 concentration and flue gas dust in the flue gas at the inlet of flue gas desulfurization are relatively low. Considering the economic and environmental aspects, flue gas desulfurization technology mostly uses dry flue gas desulfurization technology. At present, the most widely used dry desulfurization technology is sodium-based dry desulfurization technology.

[0036] However, due to the high cost of sodium-based desulfurization agents, the difficulty in handling byproducts, and the relatively harsh reaction temperature (140℃~250℃), sodium-based dry desulfurization is technically feasible, but decentralized disposal, the processing volume is too small, the cost of individual disposal is high, and the economics of centralized comprehensive disposal are not attractive. Therefore, the commercial application of sodium-based dry desulfurization byproducts is somewhat difficult.

[0037] At present, some enterprises tend to use calcium powder dry desulfurization technology. However, calcium powder desulfurizer easily absorbs water and hardens. In order to achieve a higher SO2 removal efficiency, a large amount of desulfurizer needs to be sprayed, which in turn leads to a low utilization rate of the desulfurizer.

[0038] In order to solve the above problems, the present invention proposes a calcium-based dry flue gas desulfurization system, which aims to provide a calcium-based dry flue gas desulfurization system that avoids desulfurization agent caking and improves the utilization rate of the desulfurization agent. Figure 1 A schematic structural diagram of an embodiment of a calcium-based dry flue gas desulfurization system provided by the present invention.

[0039] Please refer to Figure 1 In one embodiment of the present invention, the calcium-based dry flue gas desulfurization system 100 includes a desulfurization reactor 1, a first desulfurizer storage bin 2, a first weighing feeder 3 and a first heating device; the first desulfurizer storage bin 2 is used to accommodate high-activity calcium hydroxide powder; the first weighing feeder 3 is connected between the desulfurization reactor 1 and the first desulfurizer storage bin 2, and is used to transport the high-activity calcium hydroxide powder to the desulfurization reactor 1 to react with sulfide; the first heating device is installed in the first desulfurizer storage bin 2, and is used to heat the high-activity calcium hydroxide powder.

[0040] The technical solution of the present invention adopts the method of placing high-activity calcium hydroxide powder in the first desulfurizer storage bin 2, and then conveying the high-activity calcium hydroxide powder to the desulfurization reactor 1 to react with sulfide through the first weighing feeder 3 connected between the desulfurization reactor 1 and the first desulfurizer storage bin 2, thereby completing the desulfurization process. The high-activity calcium hydroxide powder is heated by the first heating device installed in the first desulfurizer storage bin 2, thereby preventing the high-activity calcium hydroxide powder from absorbing moisture and becoming hardened, thereby further improving the desulfurization efficiency of the system.

[0041] It is understandable that the calcium-based dry desulfurization technology uses high-activity calcium hydroxide powder as a desulfurization agent. The high-activity calcium hydroxide powder desulfurization agent transported to the flue of the desulfurization reactor 1 has the advantage of a large specific surface area, does not need to be thermally activated at high temperatures, and can fully contact with acidic substances in the flue gas within a temperature range of 50°C to 400°C to produce physical and chemical reactions to generate CaSO3 / CaSO4. Compared with the prior art, the calcium powder dry desulfurization technology has the advantages of a wider temperature range, reduced peak fluctuations, and relatively easy by-product treatment.

[0042] For further information, please refer to Figure 1The calcium-based dry flue gas desulfurization system 100 further includes a first fan 4, the first fan 4 includes a first pipe 41, and the two ends of the first pipe 41 are respectively connected to the outlet port of the first fan 4 and the air inlet port of the conveying device. It can be understood that in order to accelerate the contact between the high-activity calcium hydroxide powder entering the desulfurization reactor 1 and the sulfide, thereby accelerating the reaction rate, the calcium-based dry flue gas desulfurization system 100 further includes the first fan 4, the first fan 4 includes a first pipe 41, and the two ends of the first pipe 41 are respectively connected to the outlet port of the first fan 4 and the air inlet port of the conveying device, thereby in the process of the first weighing feeder 3 conveying the high-activity calcium hydroxide powder into the desulfurization reactor 1, the high-activity calcium hydroxide powder is blown into the flue of the desulfurization reactor 1 through the first fan 4, thereby expanding the specific surface area of ​​the high-activity calcium hydroxide powder, so that it is fully mixed with the sulfide gas, and further accelerating the desulfurization reaction rate.

[0043] Furthermore, the first pipe 41 is provided with a first nitrogen connection port, and / or a second heating device. It is understandable that in some examples, in the process of driving the air by the first blower 4 to blow the highly active calcium hydroxide powder into the flue of the desulfurization reactor 1, since the air contains a large amount of water molecules, it is very easy to cause the highly active calcium hydroxide powder to absorb water and harden in the first pipe 41, thereby blocking the first pipe 41 and affecting the rate of the desulfurization reaction. Therefore, the first pipe 41 is provided with a first nitrogen connection port, and / or a second heating device. It is understandable that by changing the gas source, the effect of water vapor in the gas on the highly active calcium hydroxide powder can be reduced. Generally, an inert gas is used as a gas source. The most economical approach is to provide a first nitrogen connection port in the first pipe 41, and then blow the highly active calcium hydroxide powder into the flue of the desulfurization reactor 1 by introducing nitrogen. Alternatively, the second heating device can be added to the first pipe 41, so that the water vapor molecules in the air introduced into the first pipe 41 are evaporated by the second heating device, and the highly active calcium hydroxide powder will not be compacted, thereby ensuring that the desulfurization rate of the calcium-based dry flue gas desulfurization system 100 will not be affected by the compaction of the highly active calcium hydroxide powder due to water absorption.

[0044] In addition, a first sensor is provided in the desulfurization reactor 1 for real-time detection of the sulfide concentration; the discharge amount of the first weighing feeder 3 is set in a positive correlation with the sulfide concentration. It is understandable that the first weighing feeder 3 has a weighing function, and can convey high-activity calcium hydroxide powder while weighing the discharge amount of the high-activity calcium hydroxide powder. With such a setting, on the one hand, it is avoided that there is too little high-activity calcium hydroxide powder in the desulfurization reactor 1, which leads to a slow desulfurization rate and insufficient desulfurization. On the other hand, it is necessary to avoid too much high-activity calcium hydroxide powder in the desulfurization reactor 1, which leads to insufficient reaction of the high-activity calcium hydroxide powder with the sulfide in the flue of the desulfurization reactor 1, so that part of the high-activity calcium hydroxide powder is destroyed before reacting with the sulfide. It is wasted, which in turn causes excessive economic costs and waste of materials. Therefore, it is necessary to provide the first sensor in the desulfurization reactor 1 to detect the sulfide concentration in real time, and then the discharge amount of the first weighing feeder 3 is positively correlated with the sulfide concentration, so that the discharge amount of the first weighing feeder 3 always forms a better reaction ratio with the sulfide concentration. Therefore, on the one hand, the desulfurization rate and sufficient desulfurization are guaranteed, and on the other hand, the waste of high-activity calcium hydroxide powder can be avoided, so that the calcium-based dry flue gas desulfurization system 100 has good economy.

[0045] In addition, please refer to Figure 1 The calcium-based dry flue gas desulfurization system 100 also includes a sodium-based treatment device 5, which includes a second desulfurization agent storage bin and a grinder conveying device: the second desulfurization agent storage bin is used to accommodate sodium bicarbonate particles; the grinder conveying device is connected between the desulfurization reactor 1 and the second desulfurization agent storage bin, and is used to crush the sodium bicarbonate particles and convey them to the desulfurization reactor 1 to react with sulfides.

[0046] It is understandable that in order to further accelerate the desulfurization reaction rate, in another embodiment, the sodium-based treatment device 5 is also added to the calcium-based dry flue gas desulfurization system 100. The sodium-based treatment device 5 adopts sodium-based dry desulfurization technology, that is, it utilizes the high activity of sodium bicarbonate adsorbent to remove sulfides in flue gas through chemical reaction adsorption. At the same time, it can also remove some inorganic and organic trace substances through physical adsorption. Sodium-based dry desulfurization technology does not require humidification, has the advantages of low investment, low energy consumption, simple installation, no wastewater discharge, and basically no cooling of flue gas at the desulfurization outlet; it can achieve a desulfurization efficiency of more than 95%, and the outlet sulfur dioxide concentration can be as low as 10mg / Nm3.

[0047] It is understandable that such a configuration can not only solve the problem of high-activity calcium hydroxide powder easily absorbing water and hardening, and then use the calcium-based dry desulfurization process, but also use the sodium-based dry desulfurization process through the sodium-based treatment device 5. This two-pronged approach not only improves the utilization rate of the desulfurizer, but also can switch the use of the desulfurizer according to the boiler operating conditions without stopping the boiler, thereby achieving a 100100% synchronization rate of the calcium-based dry flue gas desulfurization system.

[0048] In addition, please refer to Figure 1 , the calcium-based dry flue gas desulfurization system 100 also includes a dust removal device 6, which is arranged at the downstream port of the desulfurization reactor 1 to collect reaction products; a second sensor is arranged in the dust removal device 6 to detect the concentration of sulfide in real time. It can be understood that a large amount of reaction products will be generated after the reaction in the desulfurization reactor 1. Therefore, the calcium-based dry flue gas desulfurization system 100 also includes the dust removal device 6, which is arranged at the downstream port of the desulfurization reactor 1 to collect reaction products. However, in order to avoid the incomplete reaction of sulfide in the desulfurization reactor 1 from flowing into the dust removal device 6, further, the dust removal device 6 is provided with a second sensor to detect the concentration of sulfide in real time. When the concentration of sulfide is higher than the preset value, the dust removal device 6 stops collecting the reaction products, thereby increasing the reaction time of sulfide in the desulfurization reactor 1, in order to fully reduce the concentration of sulfide.

[0049] For further information, please refer to Figure 1 The calcium-based dry flue gas desulfurization system 100 also includes a waste recycling system 7, which is arranged at the downstream port of the dust removal device 6; the waste recycling system 7 includes a calcium-based ash bin 71 and a second weighing feeder 72: the calcium-based ash bin 71 is used to accommodate calcium-based ash produced by the reaction of high-activity calcium hydroxide powder and sulfide; the second weighing feeder 72 is connected between the desulfurization reactor 1 and the calcium-based ash bin 71, and is used to transport the calcium-based ash to the desulfurization reactor 1 to react with sulfide.

[0050] It can be understood that in order to ensure that the sulfide inside the desulfurization reactor 1 is reacted as much as possible, the first weighing feeder 3 still puts in an excessive amount of high-activity calcium hydroxide powder relative to the sulfide concentration inside the desulfurization reactor 1. As a result, a part of the high-activity calcium hydroxide powder is inevitably discharged into the dust removal device 6 without participating in the reaction, and then transported to the calcium-based ash bin 71, thereby causing a huge waste of materials, resulting in the economic efficiency of the calcium-based dry flue gas desulfurization system 100 being reduced. Therefore, the calcium-based dry flue gas desulfurization system 100 also includes the waste recycling system 7, which is arranged at the downstream port of the dust removal device 6, to recover the reaction products of high-activity calcium hydroxide powder and sulfide and the high-activity calcium hydroxide powder that does not participate in the reaction, and further send this part of the high-activity calcium hydroxide powder that does not participate in the reaction into the desulfurization reactor 1 to participate in the reaction, thereby greatly reducing the waste of materials, thereby improving the economy of the calcium-based dry flue gas desulfurization system 100.

[0051] For further information, please refer to Figure 1 The waste recycling system 7 further includes a third heating device installed in the calcium-based ash bin 71 to heat the calcium-based ash. It is understandable that in order to prevent this part of the high-activity calcium hydroxide powder from hardening and affecting the desulfurization rate of the high-activity calcium hydroxide powder recycled and reused by the waste recycling system 7, the waste recycling system 7 further includes the third heating device installed in the calcium-based ash bin 71 to heat the calcium-based ash, thereby preventing the usable high-activity calcium hydroxide powder in the calcium-based ash bin 71 from hardening due to water absorption.

[0052] For further information, please refer to Figure 1 The waste recycling system 7 also includes a second fan 73, and the second fan 73 includes a second pipeline 731. The two ends of the second pipeline 731 are respectively connected to the air outlet port of the second fan 73 and the air inlet port of the second weighing feeder 72.

[0053] It can be understood that in order to make the recyclable and reusable high-activity calcium hydroxide powder in the calcium-based ash bin 71 quickly enter the desulfurization reactor 1 and increase the contact area with the sulfide, thereby accelerating the reaction rate, the waste recycling system 7 also includes the second fan 73, the second fan 73 includes the second pipeline 731, and the two ends of the second pipeline 731 are respectively connected to the air outlet port of the second fan 73 and the air inlet port of the second weighing feeder 72. Therefore, in the process of the second weighing feeder 72 transporting the high-activity calcium hydroxide powder into the desulfurization reactor 1, the high-activity calcium hydroxide powder is blown into the flue of the desulfurization reactor 1 through the second fan 73, thereby expanding the specific surface area of ​​the high-activity calcium hydroxide powder, allowing it to be fully mixed with the sulfide gas, thereby further accelerating the desulfurization reaction rate.

[0054] It can be understood that the second weighing feeder 72 has a weighing function, and can transport the high-activity calcium hydroxide powder that does not participate in the reaction while weighing the discharge amount of the high-activity calcium hydroxide powder. In order to form a good reaction ratio with the sulfide in the desulfurization reactor 1, the discharge amount of the second weighing feeder 72 is positively correlated with the sulfide concentration in the desulfurization reactor 1, so that the discharge amount of the second weighing feeder 72 always forms a relatively good reaction ratio with the sulfide concentration. Therefore, on the one hand, the desulfurization rate and sufficient desulfurization are guaranteed, and on the other hand, the waste of high-activity calcium hydroxide powder can be further avoided, so that the calcium-based dry flue gas desulfurization system 100 has good economy.

[0055] Furthermore, the second pipe 731 is provided with a second nitrogen connection port, and / or a fourth heating device. It is understandable that in some examples, in the process of driving the air by the second fan 73 to blow the high-activity calcium hydroxide powder that does not participate in the reaction into the flue of the desulfurization reactor 1, since the air contains a large amount of water molecules, it is very easy to cause the high-activity calcium hydroxide powder to absorb water and compact in the second pipe 731, thereby blocking the first pipe 41, and further affecting the recovery and reuse of the high-activity calcium hydroxide powder. Therefore, the second pipe 731 is provided with a second nitrogen connection port, and / or a fourth heating device. It is understandable that by changing the gas source, the influence of water vapor in the gas on the high-activity calcium hydroxide powder is reduced. Generally, an inert gas is used as the gas source. The most economical approach is to provide a second nitrogen connection port in the second pipe 731, and then blow the high-activity calcium hydroxide powder into the flue of the desulfurization reactor 1 by introducing nitrogen. Alternatively, the fourth heating device can be added to the second pipe 731, so that the water vapor molecules in the air introduced into the second pipe 731 are evaporated by the fourth heating device, and the high-activity calcium hydroxide powder will not be compacted. This avoids the high-activity calcium hydroxide powder from absorbing water and compacting, which affects the recovery and reuse of the high-activity calcium hydroxide powder that does not participate in the reaction in the waste recycling system 7, thereby improving the economy of the calcium-based dry flue gas desulfurization system 100 and the utilization rate of the desulfurizer.

[0056] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A calcium-based dry flue gas desulfurization system, characterized in that: Suitable for gas power plants, including: Desulfurization reactor; The first desulfurization agent storage bin is used to accommodate high-activity calcium hydroxide powder; a first weighing feeder connected between the desulfurization reactor and the first desulfurization agent storage bin, for conveying high-activity calcium hydroxide powder into the desulfurization reactor to react with sulfide; and The first heating device is installed in the first desulfurizing agent storage bin and is used to heat the high-activity calcium hydroxide powder.

2. The calcium-based dry flue gas desulfurization system according to claim 1, characterized in that: The calcium-based dry flue gas desulfurization system further includes a first fan, which includes a first pipeline, and two ends of the first pipeline are respectively connected to an air outlet port of the first fan and an air inlet port of the conveying device.

3. The calcium-based dry flue gas desulfurization system according to claim 2, characterized in that: The first pipeline is provided with a first nitrogen connection port and / or a second heating device.

4. The calcium-based dry flue gas desulfurization system according to claim 1, characterized in that: The desulfurization reactor is provided with a first sensor for detecting the sulfide concentration in real time; The discharge amount of the first weighing feeder is set in a positive correlation with the sulfide concentration.

5. The calcium-based dry flue gas desulfurization system according to claim 1, characterized in that: The calcium-based dry flue gas desulfurization system further includes a sodium-based treatment device, which includes: A second desulfurizing agent storage bin is used to accommodate sodium bicarbonate particles; and The grinder conveying device is connected between the desulfurization reactor and the second desulfurization agent storage bin, and is used for crushing the sodium bicarbonate particles and conveying them to the desulfurization reactor to react with sulfides.

6. The calcium-based dry flue gas desulfurization system according to claim 1, characterized in that: The calcium-based dry flue gas desulfurization system further includes a dust removal device, which is arranged at the downstream port of the desulfurization reactor to collect reaction products; A second sensor is arranged in the dust removal device for detecting the sulfide concentration in real time.

7. The calcium-based dry flue gas desulfurization system according to claim 6, characterized in that: The calcium-based dry flue gas desulfurization system further includes a waste recycling system, which is arranged at the downstream port of the dust removal device; the waste recycling system includes: A calcium-based ash silo is used to contain calcium-based ash produced by the reaction of highly active calcium hydroxide powder and sulfide; and The second weighing feeder is connected between the desulfurization reactor and the calcium-based ash bin, and is used for conveying calcium-based ash into the desulfurization reactor to react with sulfide.

8. The calcium-based dry flue gas desulfurization system according to claim 7, characterized in that: The waste recycling system further includes a third heating device installed in the calcium-based ash bin for heating the calcium-based ash.

9. The calcium-based dry flue gas desulfurization system according to claim 7, characterized in that: The waste recycling system also includes a second fan, the second fan includes a second pipeline, and two ends of the second pipeline are respectively connected to the second fan outlet port and the second weighing feeder air inlet port.

10. The calcium-based dry flue gas desulfurization system according to claim 9, characterized in that: The second pipeline is provided with a second nitrogen connection port and / or a fourth heating device.

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