Dry desulfurization and dust removal system for low-temperature flue gas

Abstract

The invention discloses a dry desulfurization and dust removal system for low-temperature flue gas, relates to the technical field of desulfurization and dust removal, and aims at a flue gas dry desulfurization and dust removal process, takes a reaction process between SO2 and CaO as a basic principle, and improves and optimizes injection and discharge processes of the flue gas. The method is characterized in that the interior of a desulfurization tower body is divided into a gas storage bin and a reaction bin by a bin dividing sleeve, a flue gas injection process and a flue gas reaction process are independently carried out and do not interfere with each other, and according to temperature / pressure changes in the reaction process and the flue gas injection process, a flue gas transfer process in the gas storage bin and the reaction bin is changed through active displacement of a gas receiving barrel sleeve; the purpose of the invention is to further maintain the reaction environment in the reaction process on the basis of maintaining the reaction process between SO2 and CaO, and avoid the influence of the flue gas flow process on the reaction process between SO2 and CaO, thereby maintaining the overall desulfurization effect.

Description

Technical Field

[0001] The invention relates to the technical field of desulfurization and dust removal, and in particular to a dry desulfurization and dust removal system for low-temperature flue gas. Background Art

[0002] The essence of flue gas dry desulfurization and dust removal technology is: SO in flue gas 2 Reacts with CaO at high temperature to generate CaSO 4 To achieve the purpose of desulfurization, CaSO 4 The mixed product is subjected to dust removal treatment by a dust collector. For details, please refer to the relevant contents in publication numbers CN104607020A and CN108686493A.

[0003] It should be noted that: SO 2 The reaction temperature with CaO is around 400~650℃. The difference in reaction temperature directly affects the desulfurization effect, and SO 2 The reaction process with CaO involves temperature changes, and the flue gas temperature will also affect the reaction temperature. In particular, when the flue gas is added to the desulfurization tower, it will directly affect the reaction environment inside the desulfurization tower. For example, changing the ambient temperature inside the desulfurization tower will affect SO 2 The reaction effect between CaO and SO is particularly good for low-temperature flue gas, which has a temperature range of 50~150℃. 2 There is an obvious difference in reaction temperature between CaO and the reaction environment, which can be directly understood as: the reaction environment temperature / pressure in the overall desulfurization tower produces obvious fluctuations in the two processes of flue gas injection and discharge, which affects the desulfurization reaction efficiency. This application proposes a solution to this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a dry desulfurization and dust removal system for low-temperature flue gas. For the desulfurization and dust removal process of low-temperature flue gas, because there is an obvious difference between the reaction temperature and the flue gas temperature, and there will be temperature changes during the reaction process, and the flow process of the flue gas will also directly affect the desulfurization reaction temperature / pressure, directly affecting the overall desulfurization effect.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A dry desulfurization and dust removal system for low-temperature flue gas, applied in a desulfurization and dust removal process, comprises a desulfurization tower body, in which a flue gas inlet and a flue gas exhaust duct are provided from top to bottom, and a compartment sleeve is installed at the upper end of the desulfurization tower body, and the desulfurization tower body is separated into a gas storage bin and a reaction bin arranged from top to bottom by the compartment sleeve; A receiving cylinder sleeve is slidably installed in the vertical direction at the center point of the compartment sleeve, a pressure cone cap is installed at the lower end of the receiving cylinder sleeve, and vents are opened at the upper and lower ends of the receiving cylinder sleeve, a transmission rod is rotatably installed at the center point of the receiving cylinder sleeve, and a turbine fan group, a coil spring leaf group and an air-blocking fan leaf are installed in sequence along the transmission rod from top to bottom.

[0006] It is further configured as follows: the smoke inlet duct and the smoke exhaust duct are respectively connected to the gas storage bin and the reaction bin, and a heating component is installed on the inner wall of the reaction bin.

[0007] It is further configured as follows: a temperature recovery smoke pipe is installed on the desulfurization tower body, both ends of the temperature recovery smoke pipe are connected to the interior of the reaction bin, and the temperature recovery smoke pipe extends to the interior of the gas storage bin.

[0008] It is further configured as follows: a vertically arranged spiral blade fan is rotatably installed at the center point of the bottom end of the inner wall of the reaction chamber, a driving structure corresponding to the spiral blade fan is installed at the lower end of the desulfurization tower body, and the gas-solid diversion hood is installed at the external position of the spiral blade fan.

[0009] It is further configured as follows: the two ends of the temperature recovery smoke pipe are arranged in positions in the reaction chamber distributed from top to bottom.

[0010] It is further configured as follows: a gas blocking arc plate is installed at the outer position of the desulfurization tower body corresponding to the gas-solid diversion hood, the smoke exhaust duct is located at the lower side of the gas blocking arc plate, and the cross-section of the gas blocking arc plate is in an inclined arc shape along the direction pointing to the gas-solid diversion hood.

[0011] It is further configured that: the inner diameter of the air blocking arc plate is greater than the outer diameter of the gas-solid splitter hood.

[0012] It is further configured as follows: the setting positions of the turbine fan group and the air-blocking fan blades correspond to the setting positions of the two groups of air vents distributed from top to bottom, and one end position of the coil spring leaf group is connected to the position of the inner wall of the air receiving cylinder sleeve.

[0013] It is further configured as follows: a pneumatic actuator is installed at the top of the desulfurization tower body, and the output shaft end of the pneumatic actuator passes through the desulfurization tower body and is connected to the center point of the top of the air receiving cylinder sleeve.

[0014] The present invention has the following beneficial effects: 1. In view of the flue gas flow process in the dry desulfurization and dust removal process of flue gas, the interior of the overall desulfurization tower is subdivided into a gas storage chamber and a reaction chamber through a chamber sleeve. Its essence is to separate the flue gas injection process and the flue gas reaction process. The flue gas injection process and the flue gas reaction process are carried out independently and do not interfere with each other, so that the flue gas reaction process will not be affected by the flue gas injection process. The overall process also changes the flue gas flow process between the gas storage chamber and the reaction chamber through the active displacement process of the gas receiving cylinder sleeve to maintain the overall flue gas desulfurization effect. Its purpose is: while maintaining SO 2 Based on the reaction process between the gas and CaO, the reaction environment is further maintained to avoid the flue gas flow process affecting SO 2 The reaction process with CaO maintains the overall desulfurization effect; 2. Based on the above content, the flue gas flow process inside the gas receiving cylinder sleeve is further restricted. Its essence is to use the flue gas to drive the active rotation of the turbofan group, and cooperate with the elastic potential energy of the coil spring to cooperate with the active rotation of the air blocking fan. Its key role is to limit the speed of the flue gas in the gas storage bin to supplement the flue gas in the reaction bin, and avoid the pressure difference between the gas storage bin and the reaction bin. The purpose is to maintain SO 2 Based on the reaction process between the gas and CaO, the reaction environment is further maintained to avoid the flue gas flow process affecting SO 2 The reaction process between CaO and SO 2 The reaction process between CaO. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 these drawings without paying creative work.

[0016] Figure 1 This is a schematic structural diagram of a desulfurization tower body in a dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention; Figure 2 A dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention Figure 1 A cross-sectional view of Figure 3 A cross-sectional view of a desulfurization tower body in a dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention; Figure 4 A cross-sectional view of a compartment sleeve in a dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention; Figure 5A dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention Figure 4 Split diagram of ; Figure 6 This is a cross-sectional view of a gas-solid splitter hood in a dry desulfurization and dust removal system for low-temperature flue gas proposed by the present invention.

[0017] In the figure: 1. desulfurization tower body; 101. exhaust duct; 102. flue gas inlet; 2. temperature recovery smoke pipe; 3. compartment sleeve; 4. air receiving cylinder sleeve; 5. heating component; 6. gas-solid diversion hood; 7. spiral blade fan; 8. pneumatic actuator; 9. coil spring group; 10. turbine fan group; 11. transmission rod; 12. air-blocking fan blade; 13. vent; 14. air-blocking arc plate. DETAILED DESCRIPTION

[0018] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0019] Embodiment 1: For the desulfurization and dust removal process of low-temperature flue gas, because there is a significant difference between the reaction temperature and the flue gas temperature, and there will be temperature changes during the reaction process, and the flow process of the flue gas will directly affect the desulfurization reaction temperature / pressure, and directly affect the overall desulfurization effect, the following technical solutions are proposed: Reference Figures 1 to 6 In this embodiment, a dry desulfurization and dust removal system for low-temperature flue gas is used in a desulfurization and dust removal process, and includes a desulfurization tower body 1, in which a flue gas inlet 102 and a flue gas exhaust 101 are provided from top to bottom, and a compartment sleeve 3 is installed at the upper end of the desulfurization tower body 1, and the desulfurization tower body 1 is separated into a gas storage bin and a reaction bin from top to bottom by the compartment sleeve 3; An air receiving cylinder sleeve 4 is slidably installed in the vertical direction at the center point of the compartment sleeve 3, a pressure cone cap is installed at the lower end of the air receiving cylinder sleeve 4, and air vents 13 are opened at the upper and lower ends of the air receiving cylinder sleeve 4. A transmission rod 11 is rotatably installed at the center point of the air receiving cylinder sleeve 4, and a turbine fan group 10, a coil spring group 9 and an air blocking fan sheet 12 are installed in sequence on the transmission rod 11 from top to bottom. The smoke inlet 102 and the smoke exhaust duct 101 are respectively connected to the gas storage chamber and the reaction chamber, and a heating component 5 is installed on the inner wall of the reaction chamber.

[0020] Basic principle: The present invention mainly optimizes the flue gas desulfurization and dust removal process, and provides a supplementary explanation of the dry desulfurization process. Its essence is: desulfurization treatment is carried out in a dry state, using solid adsorbents or reactants (such as activated carbon, iron oxide, calcium hydroxide, etc.) to react with sulfur dioxide (SO2 ) undergoes chemical reaction or physical adsorption, thereby removing sulfur dioxide from the flue gas, and finally discharging the mixed product into a dust collector for dust removal. This embodiment mainly optimizes the flue gas flow process during the desulfurization process, and specifically refers to Figure 2 The low-temperature flue gas first enters the gas storage bin from the flue gas inlet 102, and only SO is carried out in the reaction bin. 2 The key content of the overall solution is to separate the flue gas newly added to the gas storage bin from the flue gas in the reaction bin, so that the flue gas newly added to the gas storage bin will not directly affect the reaction environment in the reaction bin, and refer to Figure 5 To explain, after the smoke reaction in the reaction chamber is completed, the mixed product after the reaction is directly discharged through the smoke exhaust duct 101, and by actively moving the gas receiving cylinder sleeve 4, the smoke in the gas storage chamber is replenished into the reaction chamber again, and the gas receiving cylinder sleeve 4 is used again to fully separate the gas storage chamber and the reaction chamber.

[0021] Embodiment 2: Based on Embodiment 1, the temperature change and flue gas flow process in the gas storage bin and the reaction bin are optimized and improved: A reheating smoke pipe 2 is installed on the desulfurization tower body 1, and the two ends of the reheating smoke pipe 2 are connected to the inside of the reaction bin, and the reheating smoke pipe 2 extends to the inside of the gas storage bin. A vertically arranged spiral blade fan 7 is rotatably installed at the center point of the bottom end of the inner wall of the reaction bin, and a driving structure corresponding to the spiral blade fan 7 is installed at the lower end of the desulfurization tower body 1. The gas-solid diversion hood 6 is installed at the external position of the spiral blade fan 7. The two ends of the reheating smoke pipe 2 are arranged in the reaction bin from top to bottom. A gas arc plate 14 is installed at the external position of the gas-solid diversion hood 6 of the desulfurization tower body 1, and the exhaust duct 101 is located at the blocking At the lower side of the air arc plate 14, the cross-section of the air-blocking arc plate 14 is in an inclined arc shape along the direction pointing to the gas-solid diverter hood 6, the inner diameter of the air-blocking arc plate 14 is larger than the outer diameter of the gas-solid diverter hood 6, the setting positions of the turbine fan group 10 and the air-blocking fan blades 12 correspond to the setting positions of the two groups of air vents 13 distributed from top to bottom, one end of the coil spring group 9 is connected to the inner wall position of the air receiving cylinder sleeve 4, and a pneumatic actuator 8 is installed at the top position of the desulfurization tower body 1, and the output shaft end of the pneumatic actuator 8 passes through the desulfurization tower body 1 and is connected to the center point of the top end of the air receiving cylinder sleeve 4.

[0022] Solution description: To supplement the content of Example 1, SO 2The reaction temperature between the gas and CaO is about 800-850°C, while the flue gas temperature targeted by the present invention is about 50-150°C, and the heating component 5 provides a heat source in the reaction chamber, and because the entire reaction chamber is in a relatively closed environment during the reaction process, the pressure in the reaction chamber gradually increases due to temperature changes, and when the low-temperature flue gas is added to the gas storage chamber, it will also affect the pressure environment and temperature environment in the gas storage chamber, so it can be understood that the pressure environment in the reaction chamber is always higher than the pressure environment in the gas storage chamber, so in SO 2 During the reaction between the gas cylinder sleeve 4 and CaO, the gas cylinder sleeve 4 is continuously subjected to the pressure from the pressure environment in the reaction chamber, thereby maintaining the Figure 2 or Figure 4 In this process, the vent 13 at the lower side of the gas receiving cylinder sleeve 4 is blocked by the compartment sleeve 3, thereby maintaining the airflow blocking effect between the gas storage chamber and the reaction chamber, and the SO in the reaction chamber 2 After the reaction process with CaO is completed, on the one hand, the mixed product can be actively discharged by opening the exhaust duct 101 to reduce the pressure environment inside the reaction chamber, so that the pressure operation in the gas storage chamber can drive the gas receiving cylinder sleeve 4 to move downward so that both vents 13 are in the open state. On the other hand, the pneumatic actuator 8 can also actively drive the gas receiving cylinder sleeve 4 to move downward, thereby performing the ventilation process between the reaction chamber and the gas storage chamber. It should also be noted that: because the flue gas is continuously injected into the gas storage bin, the pressure value in the gas storage bin will also be relatively large, and the pressure in the reaction bin will drop rapidly at the moment the exhaust duct 101 in the reaction bin is opened, resulting in a large pressure difference between the reaction bin and the gas storage bin, and the gas storage bin will directly affect the pressure environment in the reaction bin during the flue gas replenishment process in the reaction bin, which is specifically manifested as: a part of the incompletely reacted flue gas will also be directly discharged from the exhaust duct 101. In this regard, improvements are made to the interior of the gas receiving cylinder sleeve 4, which is manifested as: when the vents 101 at the upper and lower ends of the gas receiving cylinder sleeve 4 are opened, the pressure in the reaction bin will be greatly reduced. After 3 is opened, the interior of the air receiving cylinder sleeve 4 serves as the flow channel of the smoke in the gas storage bin, first directly driving the turbofan group 10 at the upper end to rotate in a directional manner, but a coil spring group 9 is also provided at the middle section of the transmission rod 11, and the winding direction of the coil spring group 9 matches the setting direction of the turbofan group 10. In this regard, the coil spring group 9 will be actively compressed under the rotation of the turbofan group 10, and the elastic effect of the coil spring group 9 will limit the rotation frequency of the turbofan group 10. The key purpose is to "limit the speed" of the air pressure when the smoke flows in the gas storage bin, so as to prevent the smoke in the gas storage bin from directly "impacting" the reaction bin; In combination with the above content, the vent 13 at the lower side of the air receiving cylinder sleeve 4 is supplemented with an explanation that the turbofan assembly 10 will also drive the air blocking fan blade 12 therein to perform directional rotation under the speed limiting effect of the coil spring blade assembly 9. The function of the air blocking fan blade 12 is to periodically block / open the vent at the lower end, and the purpose is to limit the amount of smoke in the gas storage bin that is added to the reaction bin. And further, a temperature recovery smoke pipe 2 is added according to the setting position of the reaction chamber and the gas storage chamber, such as Figure 3 As shown, both ends of the temperature recovery smoke pipe 2 are connected to the inside of the reaction chamber, and the setting position of the temperature recovery smoke pipe 2 in the reaction chamber is further limited. The purpose is that when the flue gas reacts in the reaction chamber, a part of the high-temperature flue gas will also flow in the temperature recovery smoke pipe 2 in a directional manner due to the pressure difference. On the basis of not affecting the temperature and pressure in the reaction environment, the flue gas in the gas storage bin is preheated to ensure that the flue gas temperature in the gas storage bin is close to the temperature in the reaction environment. Furthermore, a spiral blade fan 7 and a gas-solid flow divider 6 are added to the reaction chamber, and the driving structure drives the spiral blade fan 7 to rotate at a constant speed, mainly to form a vortex inside the reverse chamber, because SO 2 Mixed products such as calcium sulfate dust will be produced during the reaction with CaO, and the mixed products are mainly concentrated in the gas-solid diversion hood 6. The key is to concentrate the mixed products at the air blocking arc plate 14 to facilitate direct discharge of the mixed products in the later stage.

[0023] Embodiment 3: The following supplementary explanation is provided in combination with Embodiment 1 and Embodiment 2: To supplement the above content, it is necessary to add temperature and pressure detection structures to the gas storage bin and reaction bin in the desulfurization tower body because the key to the overall desulfurization process lies in the changes in temperature and pressure. Specifically, the temperature and pressure parameters in the reaction bin are used as key indicators. Specifically, the process control system in the current desulfurization and dust removal can be used as a judgment indicator for the active displacement of the gas receiving cylinder sleeve 4 based on the change process of the temperature and pressure parameters in the reaction bin. The process control system is not explained in the present invention.

[0024] In summary: For the flue gas dry desulfurization and dust removal process, SO 2 The reaction process between SO and CaO is the basic principle, and the flue gas injection and discharge process are improved and optimized. Its essence is to separate the interior of the desulfurization tower into a gas storage chamber and a reaction chamber by a compartment sleeve. The flue gas injection process and the flue gas reaction process are carried out independently and do not interfere with each other. According to the temperature / pressure changes in the reaction process and the flue gas injection process, the flue gas transfer process in the gas storage chamber and the reaction chamber is changed through the active displacement of the gas receiving sleeve. The purpose is to maintain SO 2 Based on the reaction process between the gas and CaO, the reaction environment is further maintained to avoid the flue gas flow process affecting SO 2The reaction process between MgO and CaO maintains the overall desulfurization effect.

[0025] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A dry desulfurization and dust removal system for low-temperature flue gas, used in the desulfurization and dust removal process, characterized in that: The desulfurization tower body (1) comprises a desulfurization tower body (1) and a gas-solid splitter cover (6), wherein a smoke inlet duct (102) and a smoke exhaust duct (101) are provided in the desulfurization tower body (1) from top to bottom, and a compartment sleeve (3) is installed at the upper end of the desulfurization tower body (1), and the desulfurization tower body (1) is divided into a gas storage compartment and a reaction compartment from top to bottom by the compartment sleeve (3); A receiving cylinder sleeve (4) is slidably mounted in the vertical direction at the center point of the compartment sleeve (3), a pressure cone cap is mounted at the lower end of the receiving cylinder sleeve (4), and vents (13) are provided at the upper and lower ends of the receiving cylinder sleeve (4), a transmission rod (11) is rotatably mounted at the center point of the receiving cylinder sleeve (4), and a turbine fan group (10), a coil spring group (9) and an air blocking fan plate (12) are sequentially mounted on the transmission rod (11) in a direction from top to bottom.

2. A low-temperature flue gas dry desulfurization and dust removal system according to claim 1, characterized in that: The smoke inlet duct (102) and the smoke exhaust duct (101) are respectively connected to the gas storage bin and the reaction bin, and a heating component (5) is installed on the inner wall of the reaction bin.

3. The dry desulfurization and dust removal system for low-temperature flue gas according to claim 1 is characterized in that: The desulfurization tower body (1) is provided with a temperature recovery flue gas pipe (2), the two ends of the temperature recovery flue gas pipe (2) are connected to the interior of the reaction chamber, and the temperature recovery flue gas pipe (2) extends to the interior of the gas storage chamber.

4. The dry desulfurization and dust removal system for low-temperature flue gas according to claim 1 is characterized in that: A vertically arranged spiral blade fan (7) is rotatably mounted at the center point of the bottom end of the inner wall of the reaction chamber, a driving structure corresponding to the spiral blade fan (7) is mounted at the lower end of the desulfurization tower body (1), and the gas-solid splitter hood (6) is mounted at an external position of the spiral blade fan (7).

5. A low-temperature flue gas dry desulfurization and dust removal system according to claim 3, characterized in that: The two ends of the temperature recovery smoke pipe (2) are arranged in positions distributed from top to bottom in the reaction chamber.

6. A low-temperature flue gas dry desulfurization and dust removal system according to claim 4, characterized in that: A gas blocking arc plate (14) is installed at an external position of the desulfurization tower body (1) corresponding to the gas-solid splitter hood (6), the smoke exhaust duct (101) is located below the gas blocking arc plate (14), and the cross section of the gas blocking arc plate (14) is in an inclined arc shape along a direction pointing toward the gas-solid splitter hood (6).

7. A low-temperature flue gas dry desulfurization and dust removal system according to claim 6, characterized in that: The inner diameter of the air blocking arc plate (14) is greater than the outer diameter of the gas-solid splitter hood (6).

8. The dry desulfurization and dust removal system for low-temperature flue gas according to claim 1, characterized in that: The arrangement positions of the turbine fan group (10) and the air blocking fan blades (12) correspond to the arrangement positions of the two groups of vents (13) distributed from top to bottom, and one end position of the coiled spring blade group (9) is connected to the inner wall position of the air receiving cylinder sleeve (4).

9. A low-temperature flue gas dry desulfurization and dust removal system according to claim 8, characterized in that: A pneumatic actuator (8) is installed at the top of the desulfurization tower body (1), and the output shaft end of the pneumatic actuator (8) passes through the desulfurization tower body (1) and is connected to the center point of the top of the air receiving cylinder sleeve (4).

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