Flue gas deep dust removal system

Abstract

The utility model provides a deep dust removal system for flue gas, which relates to the technical field of flue gas desulfurization and dust removal and comprises an absorption tower, and a slurry spraying layer, a gas lifting disc, a cooling water spraying layer and a tube bundle type dust removal demister are sequentially mounted in the absorption tower from bottom to top; a gas inlet and a gas outlet are formed in the side wall of the absorption tower, the gas inlet is located below the slurry spraying layer and connected with an original flue, the gas outlet is located above the tube bundle type dedusting demister and connected with a clean flue, and a flue gas monitoring device is arranged on the inner side of the gas outlet; the cooling water spraying layer comprises a cooling water inlet and two semicircular cooling water pipes arranged on the two sides in an extending mode, and valves are arranged on the two cooling water pipes respectively; a plurality of main pipes are oppositely arranged on the inner sides of the two cooling water pipes, the main pipes on the two cooling water pipes are arranged at intervals, a plurality of branch pipes are uniformly arranged on each main pipe, and spraying equipment is arranged at the tail end of each branch pipe. The spraying amount of cooling water is controlled by controlling the valve of the cooling water spraying layer, the device adapts to the dust amount in flue gas, and the flue gas dust removal effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas desulfurization and dust removal, in particular to a flue gas deep dust removal system. Background Art

[0002] The limestone-gypsum wet flue gas desulfurization process is the main process for controlling SO2 emissions in my country. With the improvement of ultra-clean emission standards for atmospheric pollutants, the dust emission concentration is ≤10mg / Nm3. Therefore, it is very important to control dust emissions after the absorption tower of this process.

[0003] At present, there are basically two methods to control dust concentration to meet emission standards: one is to install a wet electric after the absorption tower, and the other is to install a tube bundle dust removal and demisting device in the absorption tower. However, these two methods cannot make corresponding adjustments with changes in operating conditions. Engineering design always selects dust removal equipment according to the maximum dust load, which causes energy waste. In view of this situation, the utility model proposes a flue gas deep dust removal system, which makes the flue gas meet emission standards while allowing the process equipment to adjust the operating state according to the load changes under actual working conditions, so as to achieve the purpose of green energy saving. Utility Model Content

[0004] In view of the technical problems existing in the background technology, the utility model patent provides a flue gas deep dust removal system, which flexibly adjusts the working mode and water intake of the cooling water spray layer in the spray tower to ensure that the dust content in the clean flue gas discharged from the absorption tower meets the emission standards, while achieving the purpose of energy saving.

[0005] To achieve the above object, the utility model provides a flue gas deep dust removal system, comprising: an absorption tower, in which a slurry spray layer, an air lifting plate, a cooling water spray layer and a tube bundle type dust and mist remover are sequentially installed from bottom to top;

[0006] The side wall of the absorption tower is provided with an air inlet and an air outlet, the air inlet is located below the slurry spray layer and connected to the original flue, the air outlet is located above the tube bundle dust collector and mist eliminator and connected to the clean flue, and a flue gas monitoring device is provided inside the air outlet;

[0007] The cooling water spray layer includes a cooling water inlet, two semicircular cooling water pipes extending from the cooling water inlet to both sides, and valves are respectively arranged on the two cooling water pipes; a plurality of main pipes are arranged opposite to each other on the inner side of the two cooling water pipes, and the main pipes on the two cooling water pipes are arranged at intervals, and each main pipe is evenly provided with a plurality of branch pipes, and a spray device is arranged at the end of each branch pipe;

[0008] The flue gas in the original flue enters the absorption tower and flows upward. After fully contacting with the absorbent sprayed downward from the slurry spray layer for desulfurization, it continues to rise through the gas lift plate and fully contacts with the cooling water sprayed downward from the cooling water spray layer for cooling, so that the water in the flue gas condenses and precipitates, and the dust condenses on the gas lift plate with the cooling water. The water outlet of the gas lift plate discharges the condensed water containing dust from the absorption tower, and the flue gas continues to rise to the tube bundle dust removal and demisting device to further remove the dust and droplets in the flue gas. The flue gas monitoring device detects the dust data in the flue gas before the flue gas is discharged, and the flue gas is finally discharged to the clean flue from the gas outlet.

[0009] As a further improvement of the utility model, the air lifting plate is provided with a water outlet, and the water outlet is connected to an external condensation water tank.

[0010] As a further improvement of the utility model, the cooling water inlet of the cooling water spray layer is connected to a cooling water pump via a pipeline.

[0011] As a further improvement of the utility model, the cooling water pump is equipped with a frequency conversion device or uses a frequency conversion motor.

[0012] As a further improvement of the utility model, the slurry spraying layer is arranged in one or more layers.

[0013] As a further improvement of the utility model, two rows of branch pipes are provided on both sides of the main pipe, and the outlets of the branch pipes are downward.

[0014] As a further improvement of the utility model, the branch pipes between two adjacent main pipes are arranged at intervals and are evenly distributed.

[0015] As a further improvement of the utility model, the distances from the ends of the branch pipes between two adjacent main pipes to the two main pipes are equal.

[0016] As a further improvement of the present invention, the flue gas monitoring device is connected to a computer system, which is equipped with a trained deep learning model. The computer system is also connected to a DCS control module, which is connected to a frequency conversion device of a cooling water pump and valves of two cooling water pipes.

[0017] As a further improvement of the utility model, the two cooling water pipes are both provided with a plurality of main pipes facing inwards, and the number of the main pipes on one cooling water pipe is one more than the number of the main pipes on the other cooling water pipe.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model ensures the removal of dust in the flue gas by arranging a deep dust removal system in the absorption tower, thereby solving the problem of excessive dust concentration at the outlet of the absorption tower caused by failure of the bag filter or electrostatic precipitator in front of the absorption tower in the prior art, and ensuring that the flue gas at the outlet of the absorption tower meets the emission standards; at the same time, the utility model provides an alternately arranged cooling water spray layer, the main pipes and branch pipes connected to the two cooling water pipes can respectively cover the cross-section of the absorption tower and can be used separately, and at the same time, one or two cooling water pipes can be controlled to work according to the dust content in the flue gas, thereby saving the use of cooling water and saving energy.

[0020] The utility model also sets the cooling water pump as a variable frequency water pump. Compared with the traditional industrial frequency pump, the flow rate and head are determined. No matter how the dust at the outlet of the absorption tower changes, the cooling water volume of the spray layer remains unchanged. The variable frequency water pump of the present application can adjust the cooling water intake according to the dust data at the outlet of the absorption tower, thereby realizing the intelligent operation of the deep dust removal system and saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a flue gas deep dust removal system disclosed in an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the cooling water spray layer structure disclosed in one embodiment of the utility model;

[0023] Figure 3 A schematic diagram of a control flow of a flue gas deep dust removal system disclosed in an embodiment of the utility model;

[0024] Figure 4 The utility model discloses a schematic diagram of a control module of a flue gas deep dust removal system according to an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1. Absorption tower; 2. Tube bundle dust collector and demister; 3. Cooling water spray layer; 31. Cooling water pipe; 32. Main pipe; 33. Branch pipe; 4. Air lift plate; 5. Slurry spray layer; 6. Condensate tank; 7. CEMS gas monitoring device; 8. Cooling water pump. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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 present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" 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 mechanical connection or an electrical connection; it can be a direct connection, or it can be 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 in the present invention can be understood by specific circumstances.

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings:

[0031] like Figure 1 As shown, the utility model provides a flue gas deep dust removal system, comprising: an absorption tower 1, in which a slurry spray layer 5, an air lifting plate 4, a cooling water spray layer 3 and a tube bundle dust and mist remover 2 are sequentially installed from bottom to top;

[0032] The side wall of the absorption tower 1 is provided with an air inlet and an air outlet. The air inlet is located below the slurry spray layer 5 and is connected to the original flue. The air outlet is located above the tube bundle type dust and mist remover 2 and is connected to the clean flue. A flue gas monitoring device is provided inside the air outlet.

[0033] like Figure 2As shown, the cooling water spray layer 3 includes a cooling water inlet, two semicircular cooling water pipes 31 extending from the cooling water inlet to both sides, the two semicircular cooling water pipes 31 are located in the same horizontal plane, and form an approximately circular shape, and valves are respectively arranged on the two cooling water pipes 31, specifically valve No. 1 and valve No. 2; the cooling water inlet is connected to the cooling water pump 8 through a pipeline, and the cooling water pump 8 is a variable frequency water pump, and the two cooling water pipes 31 are both provided with a plurality of main pipes 32 relative to each other on the inner side, and the number of the main pipes 32 is flexibly set according to the size of the absorption tower 1, and the main pipes 32 on the two cooling water pipes 31 are arranged at equal intervals, and each main pipe 32 is evenly provided with a plurality of branch pipes 33, and a spraying device is arranged at the end of each branch pipe 33, and the spraying device can adopt a nozzle;

[0034] The flue gas in the original flue enters the absorption tower 1 and flows upward. After fully contacting with the absorbent sprayed downward from the slurry spray layer 5 for desulfurization, it continues to rise through the gas lift plate 4 and fully contacts with the cooling water sprayed downward from the cooling water spray layer 3 for cooling, so that the water in the flue gas is condensed and precipitated. At the same time, the dust in the flue gas is condensed on the gas lift plate 4 with the cooling water. The water on the gas lift plate 4 forms a water flow and flows to the water outlet. The water outlet is connected to the external condensation water tank 6. The condensed water containing dust is discharged from the absorption tower 1 and collected in the condensation water tank 6. The flue gas continues to rise to the tube bundle dust removal and demisting device. The tube bundle dust removal and demisting device further removes dust and droplets in the flue gas. The flue gas monitoring device detects the dust data in the flue gas before the flue gas is discharged. According to the dust data in the flue gas monitored in real time, the speed of the variable frequency water pump is adjusted, and the opening and closing states of valves No. 1 and No. 2 in the cooling water spray layer 3 are selected. The flue gas is finally discharged from the gas outlet to the clean flue.

[0035] As a preference,

[0036] The distance between the gas lift plate 4 and the cooling spray layer in the utility model is determined by calculation based on the actual flue gas cooling in the project;

[0037] In the utility model, the condensation water tank 6 is also arranged outside the absorption tower 1, and the drainage port of the gas lift plate 4 is connected to the condensation water tank 6 through a pipeline, so that the condensed water and dust are discharged from the absorption tower 1 and enter the condensation water tank 6 for temporary storage;

[0038] The cooling spray layer nozzle material of the utility model includes but is not limited to stainless steel, silicon carbide, etc., and also includes all corrosion-resistant and high-temperature-resistant materials such as PE and PPR;

[0039] In the present invention, the materials of the cooling spray layer main pipe 32 and the branch pipe 33 include, but are not limited to, stainless steel, FRP, etc., and also include all corrosion-resistant materials such as PE, PPR, PVC, etc.;

[0040] The smoke monitoring device in the utility model can adopt a CEMS smoke monitoring system, or adopt any temporary or long-term monitoring equipment that can monitor smoke dust data;

[0041] In the utility model, the slurry spraying layer 5 is arranged in one or more layers, which is determined according to the sulfur content in the smoke and the desulfurization effect;

[0042] In the utility model, two rows of branch pipes 33 are arranged on both sides of the main pipe 32, the outlets of the branch pipes 33 are downward, the branch pipes 33 between two adjacent main pipes 32 are arranged at intervals and are evenly distributed; the distances from the ends of the branch pipes 33 between two adjacent main pipes 32 to the two main pipes 32 are equal; Figure 2 As shown, both cooling water pipes 31 are provided with a plurality of main pipes 32 facing inwardly, and the number of main pipes 32 on one cooling water pipe 31 is one more than the number of main pipes 32 on the other cooling water pipe 31;

[0043] As a preference,

[0044] In the present invention, the cooling water inlet of the cooling water spray layer 3 is connected to the cooling water pump 8 through a pipeline, and the cooling water pump 8 is equipped with a frequency conversion device or a frequency conversion motor; further, the smoke monitoring device is connected to the computer system, the computer system is installed with a trained deep learning model, and the computer system is also connected to the DCS control module, and the DCS control module is connected to the frequency conversion device of the cooling water pump 8 and the valves of the two cooling water pipes 31. Specifically, Figure 3 As shown, the control method of the flue gas deep dust removal system of the utility model includes:

[0045] S1, read the dust data in the flue gas treated by the absorption tower 1 in real time through the flue gas monitoring device, and input the dust data into the computer system;

[0046] S2. The computer system analyzes, screens, and judges the dust data read in real time, removes abnormal data, and then inputs it into the trained deep learning model;

[0047] S3. The deep learning model first determines the valve to be opened, including three situations: valve No. 1 or valve No. 2 or both valves are opened at the same time; then the optimal speed of the cooling water pump 8 is calculated based on the real-time dust data and the valve opening situation, and finally the valve opening situation and the optimal speed of the cooling water pump 8 are output;

[0048] S4. The computer system sends the valve opening status and the optimal speed of the cooling water pump 8 to the DCS control module. The DCS control module controls the opening or closing of valves 1 and 2 according to the valve opening status; and adjusts the speed of the cooling water pump 8 according to the optimal speed.

[0049] Among them, the deep learning model is a convolutional neural network (CNN), and other deep learning models can also be selected according to actual conditions; the data control system includes but is not limited to a DCS system, and can also be a control device such as a PLC; the cooling water pump 8 is arranged outside the absorption tower 1, and the inlet of the cooling water pump 8 is connected to the cooling water network or water tank in the factory, and the outlet of the cooling water pump 8 is connected to the cooling water spray layer 3 through a pipeline. The cooling water pump 8 is equipped with a frequency conversion device to adjust the motor frequency according to the dust concentration at the outlet of the absorption tower 1, thereby adjusting the water spray volume of the spray layer.

[0050] The deep flue gas dust removal system of the utility model also includes multiple modules, and the multiple modules cooperate to control the operation of the deep flue gas dust removal system, specifically: Figure 4 As shown, it includes a data modeling module, a data analysis module, and a data control module;

[0051] Data modeling module for:

[0052] A mathematical model is established after classifying and deleting a large amount of dust concentration data stored in the computer;

[0053] Data analysis module for:

[0054] Based on a large amount of historical data and experience, a deep learning model is established through artificial intelligence methods. The dust concentration at the outlet of the absorption tower 1 is used as the input value to analyze and judge whether the cooling spray layer opens valve No. 1 or valve No. 2, or valves No. 1 and No. 2 are opened at the same time. Then, the speed of the cooling water pump 8 corresponding to the dust concentration and the opened valve is obtained through the training model.

[0055] Data control module, used for:

[0056] The selected cooling water inlet valve and the calculated optimal speed of the cooling water pump 8 are input into the DCS control system, and a command is issued to open the valve and adjust the speed of the cooling water pump 8.

[0057] The utility model provides a flue gas deep dust removal system, and its working principle is as follows:

[0058] The air inlet of the absorption tower 1 is connected to the original flue, and the original flue gas containing pollutants such as SO2 and dust in the original flue enters the absorption tower 1; the original flue gas flows upward, and the slurry spray layer 5 sprays the absorbent from top to bottom, so that the original flue gas and the absorbent fully contact and react to remove SO2 in the flue gas; the original flue gas after SO2 removal flows upward into the flue gas deep dust removal system, first enters the air riser 4, and the original flue gas after SO2 removal flows upward from the air riser 4, and the cooling water spray layer 3 obtains cooling water from the outside through the cooling water pump 8. The cooling water is sprayed from top to bottom, and the cooling water is fully contacted with the original flue gas running from bottom to top, so that the original flue gas is further cooled. The water in the original flue gas is condensed and precipitated due to the decrease in temperature, and the dust in the flue gas is condensed on the gas lifting plate 4 with the condensed water, and is discharged to the external condensation water tank 6 through the water outlet of the gas lifting plate 4; the cooled original flue gas flows upward to the tube bundle dust and mist eliminator 2 to further remove dust and droplets. After the treatment is completed, it is discharged to the clean flue through the outlet at the upper end of the absorption tower 1.

[0059] Advantages of the utility model:

[0060] The utility model ensures the removal of dust in the flue gas by arranging a deep dust removal system in the absorption tower, thereby solving the problem of excessive dust concentration at the outlet of the absorption tower caused by failure of the bag filter or electrostatic precipitator in front of the absorption tower in the prior art, and ensuring that the flue gas at the outlet of the absorption tower meets the emission standards; at the same time, the utility model provides an alternately arranged cooling water spray layer, the main pipes and branch pipes connected to the two cooling water pipes can respectively cover the cross-section of the absorption tower and can be used separately, and at the same time, one or two cooling water pipes can be controlled to work according to the dust content in the flue gas, thereby saving the use of cooling water and saving energy.

[0061] The utility model also sets the cooling water pump as a variable frequency water pump. Compared with the traditional industrial frequency pump, the flow rate and head are determined. No matter how the dust at the outlet of the absorption tower changes, the cooling water volume of the spray layer remains unchanged. The variable frequency water pump of the present application can adjust the cooling water intake according to the dust data at the outlet of the absorption tower, thereby realizing the intelligent operation of the deep dust removal system and saving energy.

[0062] The above are only preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A flue gas deep dust removal system, characterized in that: include: An absorption tower, wherein a slurry spray layer, an air lifting plate, a cooling water spray layer and a tube bundle type dust and mist remover are sequentially installed in the absorption tower from bottom to top; The side wall of the absorption tower is provided with an air inlet and an air outlet, the air inlet is located below the slurry spray layer and connected to the original flue, the air outlet is located above the tube bundle dust collector and mist eliminator and connected to the clean flue, and a flue gas monitoring device is provided inside the air outlet; The cooling water spray layer includes a cooling water inlet, two semicircular cooling water pipes extending from the cooling water inlet to both sides, and valves are respectively arranged on the two cooling water pipes; a plurality of main pipes are arranged opposite to each other on the inner side of the two cooling water pipes, and the main pipes on the two cooling water pipes are arranged at intervals, and each main pipe is evenly provided with a plurality of branch pipes, and a spray device is arranged at the end of each branch pipe; The air lifting plate is provided with a water outlet, and the water outlet is connected to an external condensation water tank.

2. The deep flue gas dust removal system according to claim 1 is characterized in that: The cooling water inlet of the cooling water spray layer is connected to a cooling water pump via a pipeline.

3. The deep flue gas dust removal system according to claim 2 is characterized in that: The cooling water pump is equipped with a frequency conversion device or uses a frequency conversion motor.

4. The deep flue gas dust removal system according to claim 1 is characterized in that: The slurry spraying layer is arranged in one or more layers.

5. The deep flue gas dust removal system according to claim 1 is characterized in that: Two rows of branch pipes are arranged on both sides of the main pipe, and the outlets of the branch pipes are downward.

6. The deep flue gas dust removal system according to claim 1 is characterized in that: The branch pipes between two adjacent main pipes are arranged at intervals and evenly distributed.

7. The deep flue gas dust removal system according to claim 1 is characterized in that: The distances from the ends of the branch pipes between two adjacent main pipes to the two main pipes are equal.

8. The deep flue gas dust removal system according to claim 3 is characterized in that: The flue gas monitoring device is connected to a computer system, which is equipped with a trained deep learning model. The computer system is also connected to a DCS control module, which is connected to a frequency conversion device of a cooling water pump and valves of two cooling water pipes.

9. The deep flue gas dust removal system according to claim 1 is characterized in that: The two cooling water pipes are both provided with a plurality of main pipes facing inwards, and the number of the main pipes on one cooling water pipe is one more than the number of the main pipes on the other cooling water pipe.

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