Flue gas desulfurization system

Abstract

The utility model relates to the field of air pollution prevention and control in advanced environmental protection industries, and in particular to a flue gas desulfurization system. The flue gas desulfurization system of the utility model comprises: a desulfurization device, including: a rough desulfurization device and a fine desulfurization device, wherein the flue gas outlet of the rough desulfurization device is connected to the flue gas inlet of the fine desulfurization device; the flue gas outlet of the fine desulfurization device is connected to the total flue gas outlet; a flue gas diversion pipeline, whose inlet is connected to the total flue gas inlet, whose first outlet is connected to the flue gas inlet of the rough desulfurization device through a rough desulfurization branch pipeline, and whose second outlet is connected to the flue gas inlet of the fine desulfurization device through a fine desulfurization branch pipeline; a flue gas regulating valve assembly, which adjusts the ratio of the flue gas entering from the total flue gas inlet into the rough desulfurization device and the fine desulfurization device. In the utility model, by adjusting the opening of the flue gas volume regulating valve, the processed flue gas volume of the two devices, namely the rough desulfurization device and the fine desulfurization device, can be controlled.

Description

Technical Field

[0001] The utility model relates to the field of air pollution prevention and control in advanced environmental protection industry, in particular to a flue gas desulfurization system. Background Art

[0002] As environmental protection requirements become increasingly stringent, wet desulfurization is complicated and requires high investment due to the need for supporting whitening, zero-emission facilities for desulfurization wastewater, and anti-corrosion transformation of chimneys. Powder dry desulfurization technology (including calcium-based powdered desulfurization ACA and sodium-based powdered desulfurization SDS) is widely used in coking, boiler, steel and other industries due to its significant desulfurization effect, simple process flow, low operating resistance, small device investment, small footprint, no wastewater and strong load fluctuation resistance.

[0003] Typical calcium-based powder dry desulfurization process: The desulfurizer from the new agent silo is pneumatically conveyed to the dust collector inlet flue. The desulfurizer is fully mixed with the treated flue gas and enters the bag filter. When the flue gas passes through the bag, the desulfurizer is filtered by the bag and falls evenly on the surface of the bag, forming a desulfurizer bed of a certain thickness on the bag. When the flue gas passes through the bag bed, the desulfurizer reacts chemically with the SO2 in the flue gas to achieve the purpose of removing SO2 from the flue gas. The waste desulfurizer is regularly blown into the dust collector hopper by a pulse valve, and the waste desulfurizer is pneumatically conveyed to the waste agent silo. The purified flue gas is pressurized by the induced draft fan and discharged at high altitude through the original chimney.

[0004] At present, the waste agents of powder dry desulfurization devices (including calcium-based and sodium-based) are mostly discarded directly. Due to insufficient utilization of desulfurization agents, the consumption of desulfurization agents increases, the calcium-sulfur ratio (sodium-sulfur ratio) increases, and the operating cost of the device increases. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] The utility model is expected to at least partially solve one of the above technical problems.

[0007] 2. Technical Solution

[0008] The utility model provides a flue gas desulfurization system. The flue gas desulfurization system comprises:

[0009] The desulfurization device comprises: a rough desulfurization device and a fine desulfurization device, wherein the flue gas outlet of the rough desulfurization device is connected to the flue gas inlet of the fine desulfurization device; the flue gas outlet of the fine desulfurization device is connected to the total flue gas outlet;

[0010] A flue gas diversion pipeline, whose inlet is connected to the main flue gas inlet, whose first outlet is connected to the flue gas inlet of the rough desulfurization device through the rough desulfurization branch pipeline, and whose second outlet is connected to the flue gas inlet of the fine desulfurization device through the fine desulfurization branch pipeline;

[0011] The flue gas regulating valve assembly includes: a flue gas volume regulating valve arranged at at least one of the following positions: a flue gas diversion pipeline, a rough desulfurization branch pipeline, and a fine desulfurization branch pipeline, which adjusts the ratio of the flue gas entering from the main flue gas inlet into the rough desulfurization device and the fine desulfurization device.

[0012] In some embodiments of the utility model, it also includes: a first new agent injection port, which is arranged in the fine desulfurization branch pipeline and / or the fine desulfurization device, and sprays new desulfurization agent used for the first time into the flue gas flowing through; a circulating agent injection port, which is arranged in the rough desulfurization branch pipeline and / or the rough desulfurization device, and sprays the circulating desulfurization agent that has been used at least once into the flue gas flowing through.

[0013] In some embodiments of the present invention, it also includes: a new agent silo, which stores new desulfurizer used for the first time; a circulating agent silo, whose upstream side is connected to the discharge port of the fine desulfurization device and is not connected to the discharge port of the rough desulfurization device; a waste agent silo, which stores waste desulfurizer and is isolated from the circulating agent silo; a first new agent feeder, whose upstream side is connected to the new agent silo, and whose downstream side is connected to the first new agent injection port; a circulating agent feeder, whose upstream side is connected to the downstream side of the circulating agent silo, and whose downstream side is connected to the circulating agent injection port; a silo pump, whose upstream side is connected to the discharge port of the rough desulfurization device, and whose downstream side is connected to the waste agent silo.

[0014] In some embodiments of the utility model, it also includes: a second new agent injection port, which is arranged in the rough desulfurization branch pipeline and / or the rough desulfurization device, and injects new desulfurization agent used for the first time into the flue gas flowing through; a second new agent feeder, whose upstream side is connected to the new agent silo, and whose downstream side is connected to the second new agent injection port.

[0015] In some embodiments of the present invention, the first new agent injection port is arranged in the fine desulfurization branch pipeline.

[0016] In some embodiments of the present invention, the circulating agent injection port and the second new agent injection port are arranged in the rough desulfurization branch pipeline.

[0017] In some embodiments of the present invention, a first gate valve is provided between the upstream side of the first new agent feeder and the new agent silo.

[0018] In some embodiments of the present invention, a second gate valve is provided between the upstream side of the second new agent feeder and the new agent silo.

[0019] In some embodiments of the utility model, a third gate valve is provided between the discharge port of the rough desulfurization device and the upstream side of the silo pump.

[0020] In some embodiments of the present invention, a fourth gate valve is provided between the discharge port of the fine desulfurization device and the circulating agent silo.

[0021] In some embodiments of the present invention, a fifth gate valve is provided between the circulating agent silo and the circulating agent feeder.

[0022] In some embodiments of the present invention, it further comprises: a first new agent pneumatic conveying device, which conveys the new desulfurizing agent supplied by the first new agent feeder to the first new agent injection port by pneumatic conveying.

[0023] In some embodiments of the present invention, it further comprises: a second new agent pneumatic conveying device, which conveys the new desulfurizing agent supplied by the second new agent feeder to the second new agent injection port by pneumatic conveying.

[0024] In some embodiments of the utility model, it also includes: a circulating agent pneumatic conveying device, which conveys the circulating desulfurization agent supplied by the circulating agent feeder to the circulating agent injection port by pneumatic conveying.

[0025] In some embodiments of the utility model, it also includes: a sensor group, a flue gas concentration sensor arranged at at least one of the following positions: a flue gas outlet of a rough desulfurization device; a flue gas outlet of a fine desulfurization device.

[0026] In some embodiments of the utility model, the first new agent feeder, the second new agent feeder, and the circulating agent feeder are electrically controlled variable frequency feeders; the flue gas regulating valve assembly includes: a coarse desulfurization flue gas branch valve, which is arranged on the coarse desulfurization branch pipeline; a fine desulfurization flue gas branch valve, which is arranged on the fine desulfurization branch pipeline, wherein the coarse desulfurization flue gas branch valve and the fine desulfurization flue gas branch valve are electrically controlled valves.

[0027] In some embodiments of the utility model, the sensor group includes: a rough desulfurization flue gas concentration sensor and a fine desulfurization flue gas concentration sensor, which are respectively arranged at the flue gas outlets of the rough desulfurization device and the fine desulfurization device; the sensor group includes: a rough desulfurization flue gas flow sensor and a fine desulfurization flue gas flow sensor, which are respectively arranged in the rough desulfurization branch pipeline and the fine desulfurization branch pipeline; it also includes: a control device, whose sensor signal input end is connected to the rough desulfurization flue gas concentration sensor and the fine desulfurization flue gas concentration sensor; the rough desulfurization flue gas flow sensor; the signal output end of the fine desulfurization flue gas flow sensor, and its control signal output end is connected to: the first new agent feeder, the second new agent feeder, the circulating agent feeder, the rough desulfurization flue gas branch valve, and the fine desulfurization flue gas branch valve.

[0028] In some embodiments of the present invention, in the desulfurization device, the rough desulfurization device and the fine desulfurization device are integrated and arranged side by side.

[0029] A rough desulfurization device, comprising: M rough desulfurization chambers, M ≥ 1; a rough desulfurization flue gas transfer structure, arranged on a side away from the fine desulfurization device, comprising: a flue gas inlet chamber and a flue gas outlet chamber; wherein the upstream side of the flue gas inlet chamber is connected to the flue gas inlet of the rough desulfurization device, and the downstream side is connected to the rough desulfurization chamber; the upstream side of the flue gas outlet chamber is connected to the rough desulfurization chamber;

[0030] A fine desulfurization device, comprising: N fine desulfurization chambers, N ≥ 1; a fine desulfurization flue gas transfer structure, arranged on a side away from the rough desulfurization device, comprising: a flue gas inlet chamber and a flue gas outlet chamber; wherein the downstream side of the flue gas inlet chamber is connected to the fine desulfurization chamber; the upstream side of the flue gas outlet chamber is connected to the fine desulfurization chamber, and the downstream side is connected to the flue gas outlet of the fine flue gas desulfurization device;

[0031] In some embodiments of the utility model, it also includes: a conveying pipeline, which is arranged at the rear side of the rough desulfurization device and the fine desulfurization device or uses a separate pipeline, and its upstream side is connected to the downstream side of the flue gas outlet bin of the rough desulfurization flue gas transfer structure, and its downstream side is connected to the upstream side of the flue gas inlet bin of the fine desulfurization flue gas transfer structure.

[0032] In some embodiments of the present invention, M ≥ 2, M crude desulfurization chambers are arranged in parallel

[0033] In some embodiments of the present invention, N≥2, and N fine desulfurization chambers are arranged in parallel.

[0034] In some embodiments of the utility model, the coarse desulfurization flue gas transfer structure and the fine desulfurization flue gas transfer structure both include: a structural body, which is a hollow box-shaped structure; a flue gas partition, which is obliquely arranged in the structural body, dividing the internal space of the hollow box-shaped structure into two parts: a flue gas inlet bin and a flue gas outlet bin.

[0035] In some embodiments of the present invention, the rough desulfurization chamber and the fine desulfurization chamber both include: desulfurization bags arranged inside; an ash hopper arranged at the lower part; for the rough desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of M rough desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper parts of M rough desulfurization chambers; for the fine desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of N fine desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper space of N fine desulfurization chambers.

[0036] In some embodiments of the present invention, the main smoke outlet is connected to a high-altitude chimney through an induced draft fan.

[0037] 3. Beneficial Effects

[0038] It can be seen from the above technical solution that the present invention has at least one of the following beneficial effects compared with the prior art:

[0039] 1. In the present invention, the flue gas volumes of two devices, namely the rough desulfurization device and the fine desulfurization device, can be controlled by adjusting the opening of the flue gas volume regulating valve.

[0040] 2. After the fine desulfurization device is used up, the desulfurizer still has a certain sulfur capacity. In the utility model, the sulfur capacity of the used circulating desulfurizer is used in the rough desulfurization device to achieve rough desulfurization of flue gas, realizing the maximum utilization of resources. For example, when the utilization rate of the desulfurizer is 80%, the utilization rate of the desulfurizer is greatly increased from 80% to 96%, and the utilization rate of the desulfurizer is increased by 20%, which is almost the same as the utilization rate of the conventional high-rate circulation process. However, the equipment cost or the equipment modification cost is greatly improved.

[0041] 3. Considering that the effective components of the desulfurizer after secondary or multiple utilization are low, increasing the circulation ratio will greatly increase the overall energy consumption of the system, which is not worth the loss. After experiments, the applicant found that when the utilization rate of the primary desulfurization waste agent is higher than 75%, it is not recommended to recycle the secondary waste agent. Based on this, in the utility model, the discharge port of the fine desulfurization device is connected to the circulating agent silo, and the desulfurizer entering the circulating agent silo will be transported to the rough desulfurization device for recycling by the circulating agent feeder; and the discharge port of the rough desulfurization device that uses the circulating desulfurizer after one cycle is transported to the waste agent silo through the silo pump.

[0042] 4. In the present invention, the waste agent is circulated only once, the design capacity of the desulfurizer does not change much, and the increase in device investment and power consumption can be ignored. Therefore, the process investment cost of the present invention does not change much compared with the non-circulation process; compared with the conventional high-rate circulation process, the investment cost is greatly reduced. However, by adopting the flue gas desulfurization system of the present invention, the amount of desulfurizer saved is considerable, the calcium-sulfur ratio (sodium-sulfur ratio) is greatly improved, and the operating cost of the device is greatly reduced. Therefore, from a comprehensive comparison of desulfurization efficiency, investment cost, operating cost, etc., the present invention is significantly superior to the non-circulation process and the ordinary circulation process, and has a high promotion value.

[0043] 5. In the utility model, the flue gas is diverted by the flue gas volume regulating valve and the flue gas diversion pipeline. The circulating desulfurizer reacts with the high-concentration SO2 flue gas, which can improve the utilization rate of the circulating desulfurizer; the new desulfurizer reacts with the low-concentration SO2 flue gas, which can effectively save the amount of new agent, can make the residual utilization rate of the circulating desulfurizer higher (or extend the use time of the desulfurizer in the fine desulfurization device), and can also improve the total utilization rate of the desulfurizer and reduce the total amount of desulfurizer. In addition, only part of the flue gas enters the rough desulfurization device, the flue gas flow rate of the rough desulfurization device is lower, and the flue gas has a longer residence time in the rough desulfurization device, so that the circulating desulfurizer can be more fully utilized, the total utilization rate of the desulfurizer is higher, that is, the residual utilization value of the waste agent is lower.

[0044] 6. In the present utility model, under the premise of ensuring that the export meets the standard, the discharge frequency of the three feeders can be adjusted according to the usage of the new agent and the circulating desulfurizer of the device. For example, when the output of the circulating desulfurizer (i.e., the ash discharge amount of the fine desulfurization system) is greater than the usage, the feeding amount of the first new agent feeder is reduced, and the soot blowing frequency of the fine desulfurization device is reduced at the same time, so that the residence time of the new desulfurizer in the fine desulfurization system becomes longer, that is, the reaction time is extended, the utilization rate of the new agent is increased, the residual sulfur capacity of the circulating desulfurizer is reduced, and the usage of the circulating desulfurizer will naturally increase. In the present utility model, the flue gas volumes entering the rough desulfurization device and the fine desulfurization device are controlled by the flue gas diversion pipeline, and the feeding amount of the new agent and the circulating agent is controlled in combination with the first new agent feeder, the second new agent feeder, and the circulating agent feeder, so as to save the usage of the new desulfurizer to the maximum extent and make full use of the circulating desulfurizer. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a schematic diagram of a flue gas desulfurization system according to an embodiment of the utility model.

[0046] Figure 2A and Figure 2B They are three-dimensional views of the desulfurization device in the flue gas desulfurization system of the embodiment of the utility model observed from the front and rear sides respectively.

[0047] Figure 3 for Figure 1 A top view of the flue gas dust removal equipment is shown.

[0048] Figure 4 , Figure 5 , Figure 6 They are Figure 3 The shown figure is a cross-sectional view of the flue gas dust removal equipment observed along directions A, B and C. DETAILED DESCRIPTION

[0049] The utility model designs a recycling material return process for highly efficient recycling of a desulfurizing agent, and designs a corresponding flue gas desulfurization device for recycling of the desulfurizing agent.

[0050] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific implementation methods and with reference to the accompanying drawings.

[0051] Figure 1 This is a schematic diagram of a flue gas desulfurization device for recycling desulfurizers according to an embodiment of the utility model. As shown in the figure, the flue gas desulfurization system of this embodiment is characterized by comprising:

[0052] The desulfurization device comprises: a rough desulfurization device 100 and a fine desulfurization device 200, wherein the flue gas outlet of the rough desulfurization device is connected to the flue gas inlet of the fine desulfurization device;

[0053] A flue gas diversion pipeline 300, whose inlet is connected to the main flue gas inlet, whose first outlet is connected to the flue gas inlet of the rough desulfurization device through the rough desulfurization branch pipeline 310, and whose second outlet is connected to the flue gas inlet of the fine desulfurization device through the fine desulfurization branch pipeline 320;

[0054] The silo group includes: a new agent silo 511, a recycled agent silo 512, and a waste agent silo 513;

[0055] The spray port group includes: a first new agent spray port 411, a circulating agent spray port 412, and a second new agent spray port 413;

[0056] The feeder group includes: a first new agent feeder 611, a circulating agent feeder 612, and a second new agent feeder 613;

[0057] The flue gas regulating valve assembly adjusts the ratio of the flue gas entering from the main flue gas inlet into the rough desulfurization device and the fine desulfurization device.

[0058] For the injection port group, the first new agent injection port 411 is provided in the fine desulfurization branch pipeline 320 and / or the fine desulfurization device 200, which injects the new desulfurization agent used for the first time into the flue gas flowing through. The circulating agent injection port 412 is provided in the rough desulfurization branch pipeline 310 and / or the rough desulfurization device 100, which injects the circulating desulfurization agent used at least once into the flue gas flowing through. The second new agent injection port 413 is provided in the rough desulfurization branch pipeline and / or the rough desulfurization device, which injects the new desulfurization agent used for the first time into the flue gas flowing through;

[0059] As for the silo group, the new agent silo 511 stores the new desulfurizing agent used for the first time. The circulating agent silo 512 has its upstream side connected to the discharge port of the fine desulfurization device and is not connected to the discharge port of the rough desulfurization device. The waste agent silo 513 has its upstream side connected to the discharge port of the rough desulfurization device and is not connected to the discharge port of the fine desulfurization device.

[0060] For the feeder group, the first new agent feeder 611 has its upstream side connected to the new agent bin, and its downstream side connected to the first new agent injection port. The circulating agent feeder 612 has its upstream side connected to the downstream side of the circulating agent bin, and its downstream side connected to the circulating agent injection port. The second new agent feeder 613 has its upstream side connected to the new agent bin, and its downstream side connected to the second new agent injection port.

[0061] The flue gas regulating valve assembly includes: a flue gas volume regulating valve arranged in at least one of the rough desulfurization branch pipeline, the fine desulfurization branch pipeline, and the flue gas diversion pipeline, which adjusts the ratio of the flue gas entering from the flue gas main inlet into the rough desulfurization device and the fine desulfurization device.

[0062] In the flue gas desulfurization device of this embodiment, the flue gas enters from the flue gas main inlet and is divided into two streams. One stream of flue gas first enters the rough desulfurization device, and then merges with the other stream of flue gas to enter the fine desulfurization device for fine desulfurization. The finely desulfurized flue gas is discharged from the high-altitude chimney after passing through the induced draft fan. During the desulfurization process, the flue gas in the rough desulfurization device with a high SO2 concentration is roughly desulfurized using a primary circulation desulfurizer with a higher desulfurization value, and the new desulfurizer is then used to perform fine desulfurization on the flue gas in the fine desulfurization device where the SO2 concentration has been greatly reduced. This design greatly saves the amount of new desulfurizer used, and also makes the utilization rate of the primary desulfurizer higher.

[0063] Regarding the flue gas desulfurization device of this embodiment, the following aspects need special explanation.

[0064] 1. Recycling of desulfurizer

[0065] After the fine desulfurization device is used up, the desulfurizer still has a certain sulfur capacity. In this embodiment, the sulfur capacity of the used circulating desulfurizer is used in the rough desulfurization device to achieve rough desulfurization of flue gas, realizing the maximum utilization of resources. For example, when the utilization rate of the desulfurizer is 80%, the utilization rate of the desulfurizer is greatly increased from 80% to 96%, and the utilization rate of the desulfurizer is increased by 20%, which is almost the same as the utilization rate of the conventional high-rate circulation process. However, the equipment cost or the equipment modification cost is greatly improved.

[0066] 2. Equipment improvement cost and operating cost

[0067] In this embodiment, the waste agent is circulated only once, the design capacity of the desulfurizer does not change much, and the increase in device investment and power consumption can be ignored. Therefore, the process investment cost of this embodiment does not change much compared with the non-circulation process; compared with the conventional high-rate circulation process, the investment cost is greatly reduced.

[0068] However, the flue gas desulfurization system of this embodiment can save considerable desulfurizer, significantly improve the calcium-sulfur ratio (sodium-sulfur ratio), and significantly reduce the operating cost of the device. Therefore, from the comprehensive comparison of desulfurization efficiency, investment cost, operating cost, etc., this embodiment is obviously better than the non-circulation process and the ordinary circulation process, and has a high promotion value.

[0069] 3. Effective separation of circulating desulfurizer and waste agent

[0070] Considering that the effective components of the desulfurizer after secondary or multiple utilization are low, increasing the circulation ratio will greatly increase the overall energy consumption of the system, which is not worth the loss. After experiments, the applicant found that when the utilization rate of the primary desulfurization waste agent is higher than 75%, it is not recommended to recycle the secondary waste agent. Based on this, in this embodiment, the discharge port of the fine desulfurization device is connected to the circulating agent silo, and the desulfurizer entering the circulating agent silo will be transported to the rough desulfurization device for recycling by the circulating agent feeder; and the discharge port of the rough desulfurization device that uses the circulating desulfurizer after one cycle is transported to the waste agent silo 513 through the silo pump 614.

[0071] Specifically, in this embodiment:

[0072] 1. The new agent is used as a circulating desulfurization agent after use

[0073] The new desulfurizer from the new agent silo is pneumatically transported to the flue gas duct at the inlet of the fine desulfurization device. The preliminary purified flue gas merges with another stream of unpurified flue gas and enters the fine desulfurization device. The remaining SO2 in the flue gas reacts chemically with the high-efficiency new desulfurizer in the flue and bag bed. By controlling the amount of new desulfurizer added, the SO2 concentration at the outlet of the device can be accurately controlled. The purified flue gas is pressurized by the induced draft fan and discharged at high altitude through the chimney. The circulating desulfurizer discharged from the bottom of the fine desulfurization device is collected by the circulating agent silo.

[0074] 2. The circulating desulfurizer is discharged as waste agent after use

[0075] The circulating desulfurizer from the circulating agent silo is pneumatically conveyed to the flue gas inlet of the rough desulfurization device. The circulating desulfurizer reacts chemically with SO2 in the flue gas on the flue gas and the bag bed to remove part of SO2 and achieve the purpose of preliminary purification. The recycled desulfurizer is discharged from the discharge port at the bottom of the rough desulfurization device and pneumatically conveyed to the waste agent silo 513 by the silo pump 614 and transported out of the device regularly.

[0076] In summary, the desulfurizers used by the fine desulfurization device and the rough desulfurization device are effectively separated, ensuring the stability of the content of effective desulfurization components in the circulating desulfurizer and ensuring that the circulating desulfurizer has a high utilization value.

[0077] 4. Flue gas diversion improves the utilization efficiency of circulating desulfurizer

[0078] In this embodiment, the flue gas is diverted by the flue gas volume regulating valve and the flue gas diversion pipeline. The circulating desulfurizer reacts with the high-concentration SO2 flue gas, which can improve the utilization rate of the circulating desulfurizer; the new desulfurizer reacts with the low-concentration SO2 flue gas, which can effectively save the amount of new agent, make the residual utilization rate of the circulating desulfurizer higher (or extend the use time of the desulfurizer in the fine desulfurization device), and improve the total utilization rate of the desulfurizer and reduce the total amount of the desulfurizer. In addition, only part of the flue gas enters the rough desulfurization device, the flue gas flow rate of the rough desulfurization device is lower, and the flue gas has a longer residence time in the rough desulfurization device, so that the circulating desulfurizer can be more fully utilized, the total utilization rate of the desulfurizer is higher, that is, the residual utilization value of the waste agent is lower.

[0079] 5. Control of the first new agent feeder, the second new agent feeder, and the circulating feeder

[0080] In the utility model, the flue gas volumes of two devices, namely the rough desulfurization device and the fine desulfurization device, can be controlled by adjusting the opening of the flue gas volume regulating valve; under the premise of ensuring that the outlet meets the standards, the discharge frequencies of the three feeders can be adjusted respectively according to the usage of the new agent and the circulating desulfurization agent of the device. For example, when the output of the circulating desulfurization agent (namely the ash discharge volume of the fine desulfurization system) is greater than the usage, the feed amount of the first new agent feeder is reduced, and at the same time, the soot blowing frequency of the fine desulfurization device is reduced, so that the residence time of the new desulfurization agent of the fine desulfurization system in the system becomes longer, that is, the reaction time is prolonged, the utilization rate of the new agent is increased, the residual sulfur capacity of the circulating desulfurization agent is reduced, and the usage of the circulating desulfurization agent will naturally increase.

[0081] In the utility model, the flue gas amounts entering the rough desulfurization device and the fine desulfurization device are controlled respectively by the flue gas diversion pipeline, and the feeding amounts of the new agent and the circulating agent are controlled in combination with the first new agent feeder, the second new agent feeder and the circulating agent feeder, thereby saving the amount of the new desulfurization agent to the maximum extent and making full use of the circulating desulfurization agent.

[0082] 6. Spare part of the second new agent injection port

[0083] The crude desulfurization device uses a waste agent for crude desulfurization, and at the same time reserves a second new agent injection port to prevent the situation where the SO2 concentration in the flue gas of some devices is too high. The crude desulfurization device can also use a small amount of new agent and a circulating desulfurization agent to mix to achieve the special requirements of ultra-clean emissions.

[0084] Different from the rough desulfurization device, the fine desulfurization device only uses new desulfurizer for fine desulfurization and only has a new agent injection port.

[0085] 7. Location of the nozzle

[0086] In this embodiment, the first new agent injection port is arranged in the fine desulfurization branch pipeline; the circulating agent injection port and the second new agent injection port are arranged in the rough desulfurization branch pipeline.

[0087] By setting the position of the above-mentioned injection port, on the one hand, the transportation of the desulfurizer is realized by utilizing the flue gas flow; on the other hand, the initial mixing reaction of the flue gas and the desulfurizer is realized during the transportation process.

[0088] Those skilled in the art should understand that the above-mentioned blowing port setting position is only an example, and the present invention is not limited thereto. Those skilled in the art can also set the blowing port position according to the actual scene requirements, and can also implement the present invention, and also within the protection scope of the present invention.

[0089] 8. Gate Valve

[0090] In this embodiment, a first gate valve is provided between the upstream side of the first new agent feeder and the new agent silo; a second gate valve is provided between the upstream side of the second new agent feeder and the new agent silo; a third gate valve is provided between the discharge port of the rough desulfurization device and the upstream side of the silo pump; a fourth gate valve is provided between the discharge port of the fine desulfurization device and the circulating agent silo; and a fifth gate valve is provided between the circulating agent silo and the circulating agent feeder. In this embodiment, reliable control of system operation is achieved through multiple gate valves.

[0091] Those skilled in the art should understand that the above-mentioned setting of the gate valve is only an example. Those skilled in the art can also set the position of the gate valve according to the actual scene requirements, add other gate valves or remove certain gate valves, and the present invention can also be implemented and is also within the protection scope of the present invention.

[0092] 9. Specific setting method of flue gas regulating valve assembly

[0093] In this embodiment, the flue gas regulating valve assembly includes: two flue gas volume regulating valves: a coarse desulfurization flue gas branch valve 711, which is arranged on the coarse desulfurization branch pipeline; and a fine desulfurization flue gas branch valve 712, which is arranged on the fine desulfurization branch pipeline.

[0094] In this embodiment, two branch valves are used to achieve the distribution and precise regulation of the inlet flue gas between the rough desulfurization device and the fine desulfurization device, which is conducive to adjusting the distribution of the flue gas according to the change of the sulfur content in the outlet flue gas and achieving more full utilization of the circulating desulfurizer. These will be described in detail later and will not be repeated here.

[0095] Those skilled in the art should understand that although two branch valves are provided in this embodiment, the present invention is not limited thereto. In other embodiments of the present invention, only one valve may be provided to achieve the distribution of smoke, which is also within the protection scope of the present invention.

[0096] 10. Pneumatic conveying

[0097] For powder desulfurizer, pneumatic conveying is the most effective, simple and low-cost conveying method. In this embodiment, it also includes:

[0098] The first new agent pneumatic conveying device 611a conveys the new desulfurizing agent supplied by the first new agent feeder to the first new agent injection port by pneumatic conveying;

[0099] The second new agent pneumatic conveying device 613a conveys the new desulfurizing agent supplied by the second new agent feeder to the second new agent injection port by pneumatic conveying;

[0100] The circulating agent pneumatic conveying device 612a conveys the circulating desulfurizing agent supplied by the circulating agent feeder to the circulating agent injection port by pneumatic conveying.

[0101] Those skilled in the art should understand that an air source is provided at the front end of each pneumatic conveying device. Specifically, a first Roots blower and a second Roots blower are provided at the air source side of the first and second new agent pneumatic conveying devices, respectively, and a low-pressure nitrogen source is provided at the air source side of the waste agent pneumatic conveying device.

[0102] Those skilled in the art should understand that the above pneumatic conveying is only an example. In other embodiments of the present invention, other conveying methods can also be used to implement the present invention and are also within the protection scope of the present invention.

[0103] 11. Desulfurization device

[0104] Regarding the desulfurization device in this embodiment, its structure is similar to the flue gas dust removal and desulfurization equipment with publication number CN116850711A submitted by the applicant on October 10, 2023, except that the dust removal system in CN116850711A is used as the rough desulfurization device in this embodiment; the desulfurization system is used as the fine desulfurization device in this embodiment. The following is an explanation of the parts related to this embodiment.

[0105] Figure 2A and Figure 2B They are three-dimensional views of the desulfurization device in the flue gas desulfurization system of the embodiment of the utility model observed from the front and rear sides respectively. Figure 3 for Figure 1 A top view of the flue gas dust removal equipment is shown. Figure 4 , Figure 5 , Figure 6 They are Figure 3 The shown figure is a cross-sectional view of the flue gas dust removal equipment observed along directions A, B and C.

[0106] As shown in the figure, in this embodiment, the rough desulfurization device 100 includes: M rough desulfurization chambers 110 and a rough desulfurization flue gas transfer structure 120, M ≥ 1. The fine desulfurization device 200 includes: N fine desulfurization chambers 210 and a fine desulfurization flue gas transfer structure 220, N ≥ 1. The desulfurization device also includes: a conveying pipeline 150, which is arranged at the rear side of the rough desulfurization device and the fine desulfurization device or uses a separate pipeline to connect between the flue gas outlet of the rough desulfurization device and the flue gas inlet of the fine desulfurization device.

[0107] 1. Specific settings of flue gas transfer structure

[0108] The coarse desulfurization flue gas transfer structure 120 is arranged on the side away from the fine desulfurization device, and includes: a structural body 121, which is a hollow box-shaped structure; a flue gas partition 122, which is obliquely arranged in the structural body, dividing the internal space of the hollow box-shaped structure into two parts: a flue gas inlet bin 122A and a flue gas outlet bin 122B.

[0109] In the rough desulfurization flue gas transfer structure 120, the upstream side of the flue gas inlet bin 122A is connected to the flue gas inlet of the rough desulfurization device, and the downstream side is connected to the rough desulfurization chamber; the upstream side of the flue gas outlet bin 122B is connected to the rough desulfurization chamber, and the downstream side is connected to the conveying pipeline.

[0110] The fine desulfurization flue gas transfer structure 220 is arranged on the side away from the rough desulfurization device, and includes: a structural body 221, which is a hollow box-shaped structure; a flue gas partition 222, which is obliquely arranged in the structural body, dividing the internal space of the hollow box-shaped structure into two parts: a flue gas inlet bin 222A and a flue gas outlet bin 222B.

[0111] In the fine desulfurization flue gas transfer structure 220, the upstream side of the flue gas inlet bin 222A is connected to the conveying pipeline, and the downstream side is connected to the fine desulfurization chamber; the upstream side of the flue gas outlet bin 222B is connected to the fine desulfurization chamber, and the downstream side is connected to the flue gas outlet of the flue gas fine desulfurization device.

[0112] 2. Specific settings of desulfurization chamber

[0113] The rough desulfurization chamber 110 and the fine desulfurization chamber 210 both include: desulfurization bags arranged inside; ash hoppers arranged at the bottom; for the rough desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of the M rough desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper part of the M rough desulfurization chambers. For the fine desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of the N fine desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper space of the N fine desulfurization chambers.

[0114] In this embodiment, M≥2, M coarse desulfurization chambers are arranged in parallel; N≥2, N fine desulfurization chambers are arranged in parallel, but the utility model is not limited thereto. In other embodiments of the utility model, the specific data of the desulfurization chambers in the coarse and fine desulfurization devices and the specific structure of the desulfurization chambers can be set as needed, which can also realize the utility model and is also within the protection scope of the utility model.

[0115] 3. Specific settings of the delivery pipeline

[0116] In this embodiment, the rough desulfurization device 100 and the fine desulfurization device 200 are arranged side by side, and the conveying pipeline 150 is arranged at the rear side of the rough desulfurization device and the fine desulfurization device, and its upstream side is connected to the downstream side of the flue gas outlet bin of the rough desulfurization flue gas transfer structure, and its downstream side is connected to the upstream side of the flue gas inlet bin of the fine desulfurization flue gas transfer structure.

[0117] It should be noted that the above only describes in detail the structure of the desulfurization device closely related to the present invention. For more detailed content, please refer to the relevant description of CN116850711A, which will not be repeated here.

[0118] 4. Flue gas treatment process

[0119] Inlet flue gas S O At the flue gas branch pipeline 300, it is divided into two streams, which flow into the rough desulfurization branch pipeline 310 and the fine desulfurization branch pipeline 320 respectively. In the rough desulfurization branch pipeline 310, the circulating desulfurizer DSc is sprayed to form a mixture of inlet flue gas and circulating desulfurizer: S O +DS C In the fine desulfurization branch pipeline, spray fresh desulfurizer DS F , forming a mixture of inlet flue gas and fresh desulfurizer: So+DS F The mixture of inlet flue gas and circulating desulfurizer enters the rough desulfurization device for rough desulfurization to form flue gas after rough desulfurization: S CD The flue gas after rough desulfurization, together with the mixture of inlet flue gas and fresh desulfurizer, enters the fine desulfurization device for fine desulfurization, thereby forming the flue gas S after fine desulfurization. FD .

[0120] 12. Intelligent control of flue gas desulfurization system

[0121] In this embodiment, the first new agent feeder, the second new agent feeder, and the circulating agent feeder are electrically controlled variable frequency feeders. The flue gas regulating valve assembly includes: a coarse desulfurization flue gas branch valve, which is arranged on the coarse desulfurization branch pipeline; and a fine desulfurization flue gas branch valve, which is arranged on the fine desulfurization branch pipeline. Both are electrically controlled valves.

[0122] In this embodiment, it also includes: a sensor group. The sensor group includes: a rough desulfurization flue gas concentration sensor 811 and a fine desulfurization flue gas concentration sensor 812, which are respectively arranged in the rough desulfurization device and the high-altitude chimney, and the flue gas concentrations sensed by the two are C1 and C2 respectively; the signal output ends of the two are respectively connected to the sensor signal input end of the control device. The rough desulfurization flue gas flow sensor 811a and the fine desulfurization flue gas flow sensor 812a are respectively arranged in the rough desulfurization branch pipeline and the fine desulfurization branch pipeline, and the flue gas flow sensed by the two are respectively displayed as F1 and F2, which are used to feedback the flue gas flow passing through the rough desulfurization flue gas branch valve 711 and the fine desulfurization flue gas branch valve 712, that is, the flue gas flow entering the rough desulfurization device and the fine desulfurization device.

[0123] In this embodiment, it also includes: a control device 900, whose sensor signal input end is connected to the signal output end of the rough and fine desulfurization flue gas concentration sensors; the rough desulfurization target concentration upper limit C11 and lower limit C12; the fine desulfurization target concentration upper limit C21 and lower limit C22; its control signal output end is connected to the rough desulfurization flue gas branch valve, the fine desulfurization flue gas branch valve in the flue gas regulating valve assembly; the first new agent feeder, the second new agent feeder, and the circulating agent feeder. The control device executes the following control logic: the first new agent feeder control logic, the second new agent feeder control logic, and the flue gas regulating valve assembly control logic. The following are detailed descriptions.

[0124] 1. First new agent feeder control logic:

[0125] If C1≥C11 and the first new agent feeder has not reached the maximum feeding frequency, the first new agent feeder is controlled to increase the feeding frequency according to a preset step length;

[0126] If C1≥C11 and the first new agent feeder has reached the maximum feeding frequency, the control logic of the flue gas regulating valve assembly is called, and the fine desulfurization flue gas branch valve reduces the valve opening according to the preset step length;

[0127] If C1≤C12 and the first new agent feeder has not reached the minimum feeding frequency, the first new agent feeder is controlled to reduce the feeding frequency according to a preset step length;

[0128] If C1≤C12 and the first new agent feeder has reached the minimum feeding frequency, the flue gas regulating valve assembly control logic is called, and the fine desulfurization flue gas branch valve increases the valve opening according to the preset step size.

[0129] Specifically, the feeding frequency of the feeder of the rough desulfurization device is automatically adjusted according to the difference between the SO2 concentration measured at the outlet of the rough desulfurization device and the target SO2 concentration range. For example, when the SO2 concentration value of the analyzer at the outlet of the rough desulfurization device is higher than the upper limit of the target value C11, the feeding frequency of the feeder of the rough desulfurization device increases by 2Hz and stabilizes for 10 minutes. If the concentration is still greater than the upper limit of the target value C11, the feeder frequency increases by another 2Hz and stabilizes for 10 minutes until the SO2 concentration reaches the target range, and the feeder frequency is no longer adjusted. On the contrary, if the measured SO2 concentration is less than the lower limit of the target value C12, the feeder frequency is gradually reduced. The control method is similar to the above and will not be repeated here.

[0130] 2. Circulating agent feeder control logic

[0131] If C2≥C21 and the circulating agent feeder has not reached the maximum feeding frequency, the circulating agent feeder is controlled to increase the feeding frequency according to the preset step length;

[0132] If C2≥C21 and the circulating agent feeder has reached the maximum feeding frequency, the control logic of the flue gas regulating valve assembly is called, and the valve opening of the crude desulfurization flue gas branch is adjusted to a smaller valve opening according to the preset step length;

[0133] If C2≤C22 and the circulating agent feeder has not reached the minimum feeding frequency, the circulating agent feeder is controlled to reduce the feeding frequency according to a preset step length;

[0134] If C2≤C22, and the circulating agent feeder has reached the minimum feeding frequency, the flue gas regulating valve assembly control logic is called and the opening of the crude desulfurization flue gas branch valve is increased.

[0135] 3. Second new agent feeder control logic

[0136] During normal operation, the second new agent feeder is not enabled;

[0137] When C1≥C11, and C2≥C21, and both the first new agent feeder and the circulating agent feeder reach the maximum power frequency, the automatic interlock switch is triggered: ① The second new agent feeder starts automatically; ② At the same time, the rough desulfurization flue gas branch valve is opened according to the preset step length; ③ At the same time, the fine desulfurization flue gas branch valve is closed according to the preset step length;

[0138] When C1≤C12 and C2≤C21, the automatic interlock switch is triggered to close the second new agent feeder.

[0139] Specifically, according to the difference between the SO2 concentration value monitored in real time by the chimney analyzer and the target SO2 concentration, the feeding frequency and the opening of the regulating valve of the feeder of the rough desulfurization and fine desulfurization devices are automatically adjusted, so that the desulfurizer of the rough desulfurization and fine desulfurization devices can be automatically fed, so that the SO2 concentration at the outlet of the flue gas desulfurization system meets the design requirements.

[0140] 3. Flue gas regulating valve assembly control logic

[0141] The initial state of the flue gas regulating valve assembly is: the fine desulfurization flue gas branch valve is at the minimum opening, and the coarse desulfurization flue gas branch valve is at the maximum opening. Then, the opening is adjusted according to the specific conditions of each feeder.

[0142] Specifically, electric regulating valves are installed in both the crude desulfurization branch pipeline and the fine desulfurization branch pipeline. The operator in the control room can adjust the opening of the flue gas regulating branch valves at the inlet of the crude desulfurization device and the fine desulfurization device at any time to adjust the amount of flue gas entering the two desulfurization devices respectively. After the interlocking control is put into operation, the device can realize automatic control.

[0143] By adjusting the flue gas volume, combined with the interlocking automatic control of the two feeder frequencies and the analyzer SO2 concentration, the regulating valve of the rough desulfurization device is at the maximum opening, and the frequency of the feed system is operated at a higher frequency on the basis of ensuring that the SO2 at the device outlet meets the standard. At this time, the valve of the fine desulfurization device must be opened at a smaller degree, and the frequency of the feeder is also operated at a lower frequency, so as to achieve the highest utilization rate of the desulfurizer and maximize the economy. Furthermore, by adjusting the third feeder, the exceptional situation of excessively high SO2 concentration in the flue gas of some devices is prevented, and the reliable operation of the flue gas desulfurization system is achieved.

[0144] It should be noted that automatically controlling each feeder and smoke regulating valve assembly according to the information sensed by the sensor is only a preferred implementation of the present invention. In some embodiments of the present invention, each feeder and smoke regulating valve assembly can still be controlled manually or semi-automatically, although the degree of intelligence is slightly lower and the operation is more complicated, the present invention can also be implemented and is also within the protection scope of the present invention.

[0145] 13. Relationships among the various parts

[0146] The above is a detailed description of the overall embodiment of the utility model. However, those skilled in the art should understand that each innovation in the utility model can be implemented separately and solve related technical problems, for example:

[0147] 1. By setting up a new agent silo, a circulating agent silo, a first new agent injection port, a circulating agent injection port, etc., even without a flue gas volume regulating valve, the circulating desulfurization agent and the waste agent can be effectively separated to achieve the effect of improving the calcium-sulfur ratio (sodium-sulfur ratio).

[0148] 2. By setting up a flue gas regulating valve assembly, the ratio of flue gas distributed to the rough desulfurization device and the fine desulfurization device can be adjusted. In this case, even without other components, some functions of the utility model can be achieved and are also within the protection scope of the utility model.

[0149] At this point, the various embodiments of the present invention have been introduced. Based on the above description, those skilled in the art should have a clear understanding of the present invention.

[0150] The ordinal numbers used in the specification and claims, such as "first", "second", "third", "primary", "secondary", as well as Arabic numerals, letters, etc., to modify the corresponding elements (or steps), are intended only to clearly distinguish an element (or step) with a certain name from another element (or step) with the same name, and do not mean that the element (or step) has any ordinal number, nor do they represent the order of one element (or step) and another element (or step).

[0151] It should also be noted that the directional terms mentioned in the embodiments, such as "center", "lateral", "longitudinal", "top", "bottom", "up", "down", "front", "back", "left", "right", "inside", "outside", etc., indicate positions or positional relationships based only on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. Moreover, throughout the drawings, the same elements are represented by the same or similar reference numerals. Moreover, the shapes and sizes of the components in the drawings do not reflect the actual size and proportion, but only illustrate the contents of the embodiments of the utility model.

[0152] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0153] Those skilled in the art should understand that in the claims and description of the utility model, the word "comprising" does not exclude the existence of elements (or steps) not listed in the claims. The word "a" or "an" before an element (or step) does not exclude the existence of multiple such elements (or steps).

[0154] For certain implementation methods, if they are not the key content of the present invention and are well known to ordinary technicians in the relevant technical field, they are not described in detail in the drawings or text of the specification due to space limitations. In this case, they can be understood by referring to relevant existing technologies.

[0155] Furthermore, the above embodiments are provided only for the purpose of enabling the present invention to satisfy legal requirements, and the present invention can be implemented in many different forms and should not be construed as limited to the embodiments set forth herein.

[0156] Similarly, it should be understood that in order to simplify the present invention, in the above description of the exemplary embodiments of the present invention, the various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the utility model should not be interpreted as reflecting the following intention: the utility model claimed for protection requires more features than the features explicitly stated in each claim. More specifically, as reflected in the claims, each aspect of the utility model is less than all the features of the previous single embodiment. Moreover, the embodiments can be mixed and matched with each other or with other embodiments based on design and reliability considerations, that is, the technical features in different embodiments can be freely combined to form more embodiments. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present invention.

[0157] The above specific embodiments provide a detailed description of the purpose, technical means and beneficial effects of the utility model. It should be understood that the purpose of the detailed description is to enable those skilled in the art to understand the utility model more clearly, and it is not used to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A flue gas desulfurization system, characterized in that: include: The desulfurization device comprises: a rough desulfurization device and a fine desulfurization device, wherein the flue gas outlet of the rough desulfurization device is connected to the flue gas inlet of the fine desulfurization device; the flue gas outlet of the fine desulfurization device is connected to the total flue gas outlet; A flue gas diversion pipeline, whose inlet is connected to the main flue gas inlet, whose first outlet is connected to the flue gas inlet of the rough desulfurization device through a rough desulfurization branch pipeline, and whose second outlet is connected to the flue gas inlet of the fine desulfurization device through a fine desulfurization branch pipeline; The flue gas regulating valve assembly includes: a flue gas volume regulating valve arranged at at least one of the following positions: a flue gas diversion pipeline, a rough desulfurization branch pipeline, and a fine desulfurization branch pipeline, which adjusts the ratio of the flue gas entering from the main flue gas inlet into the rough desulfurization device and the fine desulfurization device.

2. The flue gas desulfurization system according to claim 1, characterized in that: Also includes: A first new agent injection port is provided in the fine desulfurization branch pipeline and / or the fine desulfurization device, and injects new desulfurization agent used for the first time into the flue gas flowing therethrough; The circulating agent injection port is arranged in the rough desulfurization branch pipeline and / or the rough desulfurization device, and injects the circulating desulfurization agent used at least once into the flue gas flowing through.

3. The flue gas desulfurization system according to claim 2, characterized in that: Also includes: A new agent silo, which stores new desulfurization agent used for the first time; A circulating agent silo, the upstream side of which is connected to the discharge port of the fine desulfurization device and is not connected to the discharge port of the rough desulfurization device; A waste agent silo, which stores waste desulfurization agent and is isolated from a circulating agent silo; A first new agent feeder, the upstream side of which is connected to the new agent silo, and the downstream side of which is connected to the first new agent injection port; A circulating agent feeder, the upstream side of which is connected to the downstream side of the circulating agent silo, and the downstream side of which is connected to the circulating agent injection port; A silo pump has an upstream side connected to the discharge port of the rough desulfurization device, and a downstream side connected to the waste agent silo.

4. The flue gas desulfurization system according to claim 3, characterized in that: Also includes: A second new agent injection port is provided in the rough desulfurization branch pipeline and / or the rough desulfurization device, and injects new desulfurization agent used for the first time into the flue gas flowing therethrough; The second new agent feeder has its upstream side connected to the new agent silo, and its downstream side connected to the second new agent injection port.

5. The flue gas desulfurization system according to claim 4, characterized in that: The first new agent injection port is arranged in the fine desulfurization branch pipeline; And / or, the circulating agent injection port and the second new agent injection port are arranged in the rough desulfurization branch pipeline; and / or, a first gate valve is provided between the upstream side of the first new agent feeder and the new agent silo; and / or, a second gate valve is provided between the upstream side of the second new agent feeder and the new agent silo; and / or, a third gate valve is provided between the discharge port of the rough desulfurization device and the upstream side of the silo pump; And / or, a fourth gate valve is provided between the discharge port of the fine desulfurization device and the circulating agent silo; And / or, a fifth gate valve is provided between the circulating agent silo and the circulating agent feeder; And / or, further comprising: a first new agent pneumatic conveying device, which conveys the new desulfurizing agent supplied by the first new agent feeder to the first new agent injection port by pneumatic conveying; And / or, further comprising: a second new agent pneumatic conveying device, which conveys the new desulfurizing agent supplied by the second new agent feeder to the second new agent injection port by pneumatic conveying; And / or, it also includes: a circulating agent pneumatic conveying device, which conveys the circulating desulfurization agent supplied by the circulating agent feeder to the circulating agent injection port by pneumatic conveying.

6. The flue gas desulfurization system according to claim 4, characterized in that: Also includes: The sensor group is a flue gas concentration sensor arranged at at least one of the following positions: the flue gas outlet of the rough desulfurization device; the flue gas outlet of the fine desulfurization device.

7. The flue gas desulfurization system according to claim 6, characterized in that: The first new agent feeder, the second new agent feeder and the circulating agent feeder are electrically controlled variable frequency feeders; The flue gas regulating valve assembly comprises: a coarse desulfurization flue gas branch valve, which is arranged on the coarse desulfurization branch pipeline; a fine desulfurization flue gas branch valve, which is arranged on the fine desulfurization branch pipeline, wherein the coarse desulfurization flue gas branch valve and the fine desulfurization flue gas branch valve are electrically controlled valves.

8. The flue gas desulfurization system according to claim 7, characterized in that: The sensor group includes: a rough desulfurization flue gas concentration sensor and a fine desulfurization flue gas concentration sensor, which are respectively arranged at the flue gas outlets of the rough desulfurization device and the fine desulfurization device; The sensor group includes: a rough desulfurization flue gas flow sensor and a fine desulfurization flue gas flow sensor, which are respectively arranged in the rough desulfurization branch pipeline and the fine desulfurization branch pipeline; It also includes: a control device, whose sensor signal input end is connected to a rough desulfurization flue gas concentration sensor and a fine desulfurization flue gas concentration sensor; a rough desulfurization flue gas flow sensor; a signal output end of the fine desulfurization flue gas flow sensor, and whose control signal output end is connected to: a first new agent feeder, a second new agent feeder, a circulating agent feeder, a rough desulfurization flue gas branch valve, and a fine desulfurization flue gas branch valve.

9. The flue gas desulfurization system according to any one of claims 1 to 8, characterized in that: In the desulfurization device, a rough desulfurization device and a fine desulfurization device are integrated and arranged side by side; The rough desulfurization device comprises: M crude desulfurization chambers, M ≥ 1; The rough desulfurization flue gas transfer structure is arranged on the side away from the fine desulfurization device, and includes: a flue gas inlet bin and a flue gas outlet bin; wherein the upstream side of the flue gas inlet bin is connected to the flue gas inlet of the rough desulfurization device, and the downstream side is connected to the rough desulfurization chamber; the upstream side of the flue gas outlet bin is connected to the rough desulfurization chamber; Fine desulfurization device, including: N fine desulfurization chambers, N ≥ 1; The fine desulfurization flue gas transfer structure is arranged on the side away from the rough desulfurization device, and includes: a flue gas inlet bin and a flue gas outlet bin; wherein the downstream side of the flue gas inlet bin is connected to the fine desulfurization chamber; the upstream side of the flue gas outlet bin is connected to the fine desulfurization chamber, and the downstream side is connected to the flue gas outlet of the flue gas fine desulfurization device; It also includes: a conveying pipeline, which is arranged at the rear side of the rough desulfurization device and the fine desulfurization device or uses a separate pipeline, and its upstream side is connected to the downstream side of the flue gas outlet bin of the rough desulfurization flue gas transfer structure, and its downstream side is connected to the upstream side of the flue gas inlet bin of the fine desulfurization flue gas transfer structure.

10. The flue gas desulfurization system according to claim 9, characterized in that: M≥2, M crude desulfurization chambers are arranged in parallel; and / or, N ≥ 2, N fine desulfurization chambers are arranged in parallel; And / or, the coarse desulfurization flue gas transfer structure and the fine desulfurization flue gas transfer structure both include: a structural body, which is a hollow box-shaped structure; a flue gas partition, which is obliquely arranged in the structural body, dividing the internal space of the hollow box-shaped structure into two parts: a flue gas inlet bin and a flue gas outlet bin; And / or, the rough desulfurization chamber and the fine desulfurization chamber both include: desulfurization bags arranged inside; ash hoppers arranged at the bottom; for the rough desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of M rough desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper parts of M rough desulfurization chambers; for the fine desulfurization device, the downstream side of the flue gas inlet chamber is connected to the ash hoppers of N fine desulfurization chambers; the upstream side of the flue gas outlet chamber is connected to the upper space of N fine desulfurization chambers; And / or, the main smoke outlet is connected to a high-altitude chimney through an induced draft fan.

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