Two-stage condensation water removal equipment for on-line monitoring of flue gas

Abstract

The invention relates to the technical field of flue gas monitoring, in particular to two-stage condensation dewatering equipment for online flue gas monitoring, which comprises a sampling pump, a filter, a first-stage condenser, a second-stage condenser and a liquid collecting hopper, the top end of the sampling pump is communicated and connected with a sampling pipe, the sampling pipe is sleeved with a heat tracing sleeve assembly, and the heat tracing sleeve assembly comprises a connecting rod; a row of metal hoops are arranged on the connecting rod, heat tracing bands are arranged in the metal hoops, the filter and the first-stage condenser are communicated and connected through a second conveying pipe, the first-stage condenser comprises a shell, a spiral flow guide body is installed at one end in the shell, and baffle plates are arranged on the inner wall of the shell in a staggered mode. Through the heat tracing sleeve assembly, dead-angle-free heat tracing and heat preservation of the sampling pipe in the whole process are achieved, smoke is effectively prevented from dewing due to temperature reduction in the conveying process, and sample gas component loss caused by the fact that pollutants such as SOs are dissolved in condensate water is avoided.

Description

Technical Field

[0001] This invention relates to the field of flue gas monitoring technology, specifically to a two-stage condensation and dehydration device for online monitoring of flue gas. Background Technology

[0002] As a key sector for industrial flue gas emissions, the steel industry, after the implementation of ultra-low emission policies, needs to address the SO2 and NO emissions from coke ovens, blast furnaces, converters, and other sources. x Accurate real-time monitoring of pollutants is required. This type of flue gas is characterized by high temperature and high humidity, and contains dust, particulate matter, and ammonium salt crystals produced during denitrification. If it directly enters the monitoring equipment, moisture can easily cause pollutants to dissolve, and equipment components to corrode or become clogged, severely affecting the accuracy of monitoring data. Therefore, the online flue gas monitoring system needs to be equipped with condensation and dehydration pretreatment equipment. Through efficient water removal, anti-condensation, and impurity filtration functions, it provides dry, clean sample gas for accurate pollutant monitoring, meeting the needs of environmental supervision and enterprise emission reduction control.

[0003] Existing condensation and dehydration equipment used for online flue gas monitoring is prone to condensation when flue gas is input into the sampling tube, resulting in the dissolution and loss of pollutants such as SO2. Moreover, the efficiency of primary condensation and dehydration is limited, and if the flue gas residence time is too long or the dehydration is incomplete, it can easily aggravate the dissolution of pollutants. Summary of the Invention

[0004] The purpose of this invention is to provide a two-stage condensation and dehydration device for online monitoring of flue gas in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: a two-stage condensation and dehydration device for online monitoring of flue gas, comprising a sampling pump, a filter, a primary condenser, a secondary condenser, and a liquid collection hopper. The top of the sampling pump is connected to a sampling tube, and a heat tracing sleeve assembly is fitted on the sampling tube. The heat tracing sleeve assembly includes a connecting rod, and a row of metal hoops is provided on the connecting rod. A heat tracing tube is provided inside the metal hoops. The filter and the primary condenser are connected through a second delivery pipe. The primary condenser includes a shell, and a spiral guide fluid is installed at one end inside the shell. Baffles are staggered on the inner wall of the shell.

[0006] The bottom of the secondary condenser is connected to a liquid collection hopper, and a peristaltic pump is installed at the bottom of the liquid collection hopper. One end of the peristaltic pump is connected to a drain pipe.

[0007] Preferably, the metal hoop is a "C"-shaped hoop with an opening on one side, the heat tracing cable is attached to the inner wall of the metal hoop, and a row of connecting rods is attached to the outer wall of the sampling tube.

[0008] Preferably, the sampling tube is arranged in an "L" shape, and the heat tracing sleeve assembly is arranged in a bent shape, with the bent shape of the heat tracing sleeve assembly matching the "L" shape of the sampling tube.

[0009] Preferably, the sampling pump and the filter are connected by a first delivery pipe, one end of the filter is connected to a second delivery pipe, and the filter is connected to one end of the first-stage condenser through the second delivery pipe.

[0010] Preferably, the spiral guide fluid is arranged in the shape of a spiral blade, and both ends of the spiral guide fluid are fixed inside the outer shell through a central shaft.

[0011] Preferably, the baffles are located outside the spiral guide, and there are four baffles arranged in a cross shape.

[0012] Preferably, a secondary condenser is connected to one end of the primary condenser, and a drain port is opened at the bottom of the secondary condenser, with the top of the liquid collection hopper connected to the drain port.

[0013] Preferably, the liquid collecting hopper is a frustum-shaped structure with openings at both the top and bottom. The inner wall of the liquid collecting hopper is provided with a guide groove. The liquid collecting hopper and the peristaltic pump are connected to the drain pipe through a one-way valve.

[0014] Preferably, a third delivery pipe is connected to the top of the secondary condenser, and a flow controller is connected to one end of the third delivery pipe.

[0015] Preferably, the flow controller is equipped with a gas supply pipe, and the flow controller is connected to the gas detector through the gas supply pipe. The bottom of the gas detector is connected to an exhaust pipe.

[0016] A two-stage condensate removal device for online monitoring of flue gas, the method of using the above device includes the following steps:

[0017] The first step is to set the heat tracing temperature of the heat tracing jacket assembly, the cooling temperature of the first-stage condenser and the second-stage condenser through the control system, and calibrate the target air intake of the flow controller.

[0018] The second step is to start the sampling pump and extract flue gas from the flue through the sampling tube.

[0019] The third step involves the continuous heating of the heat tracing cable, which is then conducted to the entire sampling tube via a metal clamp to prevent condensation of the flue gas during transmission.

[0020] The fourth step is that the extracted flue gas enters the filter through the first conveying pipe, and the filter element inside the filter filters out impurities such as dust, particulate matter and ammonium salt crystals in the flue gas. The filtered flue gas is then conveyed to the first-stage condenser through the second conveying pipe.

[0021] In the fifth step, the flue gas enters the first-stage condenser and first flows through the spiral guide fluid. Under the guidance of the spiral blades, it generates a rotational motion. Centrifugal force is used to throw most of the large-diameter condensate droplets in the flue gas toward the inner wall of the outer shell. The rotated flue gas continues to flow through the cross-shaped baffles. The flue gas flow direction changes and forms turbulence, which further increases the gas-liquid contact area and enhances the condensation and separation of small-diameter water droplets. After the initial water removal, the flue gas flows to the second-stage condenser.

[0022] The sixth step is the secondary condenser, which performs deep dehumidification at a lower temperature to remove residual tiny droplets and ensure that the moisture content of the outlet flue gas meets the gas detection accuracy requirements.

[0023] Step 7: The generated condensate flows into the collection hopper at the bottom of the secondary condenser. The frustum-shaped structure and the inner wall guide groove guide the condensate to quickly converge to the bottom. Start the peristaltic pump, and the condensate enters the drain pipe through the one-way valve and is discharged. The one-way valve prevents acidic condensate from flowing back and corroding the internal parts of the equipment.

[0024] The eighth step involves the flue gas, after two stages of condensation and dehydration, entering the flow controller through the third delivery pipe. Under the precise adjustment of the flow controller, the flue gas flows at a stable flow rate through the gas delivery pipe into the gas detector. The gas detector analyzes and detects the pollutants in the flue gas, generates monitoring data, and the exhaust gas is discharged in compliance with regulations through the exhaust pipe after the analysis is completed.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1. By setting up a heat tracing jacket assembly, the sampling tube is heated and kept warm throughout the entire process without dead angles, effectively preventing condensation of flue gas due to temperature drop during transmission and avoiding loss of sample gas components caused by SO2 and other pollutants dissolving in condensate.

[0027] 2. By combining a primary condenser and a secondary condenser, and with the combination design of a spiral guide and a cross-shaped baffle in the primary condenser, large-diameter condensate droplets are quickly separated and gas-liquid contact is enhanced through the dual effects of centrifugal force and turbulence. This shortens the flue gas residence time, improves the initial water removal efficiency, reduces condensate adhesion residue, and solves the problem of SO2 dissolution loss under ultra-low emissions.

[0028] 3. By combining the liquid collection hopper and peristaltic pump with the design of the inner wall guide groove, the condensate produced by the two-stage condenser can be quickly collected. With the drainage structure of the one-way valve and peristaltic pump, it can prevent acidic waste liquid from flowing back and corroding the equipment, reduce the residence time of acidic condensate in the cavity, and reduce the risk of pipeline corrosion. Attached Figure Description

[0029] Figure 1 A schematic diagram of the overall structure of the condensate removal equipment;

[0030] Figure 2This is the second schematic diagram of the overall structure of the condensate dehydration equipment.

[0031] Figure 3 This is a structural diagram of the sampling tube, the heating jacket assembly, and the sampling pump.

[0032] Figure 4 This is a schematic diagram of the heat tracing jacket assembly;

[0033] Figure 5 This is a schematic diagram of the internal structure of the first-stage condenser.

[0034] Figure 6 A schematic diagram of the structure of the secondary condenser, liquid collection hopper, peristaltic pump, and drain pipe;

[0035] Figure 7 A schematic diagram of the internal structure of the liquid collection hopper, peristaltic pump, and drain pipe;

[0036] Figure 8 This is the third schematic diagram of the overall structure of the condensate dehydration equipment.

[0037] In the diagram: 1. Cabinet; 2. Sampling tube; 3. Heat tracing jacket assembly; 301. Connecting rod; 302. Metal hoop; 303. Heat tracing tape; 4. Sampling pump; 5. First delivery pipe; 6. Filter; 7. Second delivery pipe; 8. First-stage condenser; 801. Outer shell; 802. Spiral guide tube; 803. Baffle plate; 9. Second-stage condenser; 10. Liquid collection hopper; 11. Peristaltic pump; 12. Drain pipe; 13. Third delivery pipe; 14. Flow controller; 15. Gas detector; 16. Exhaust pipe. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 8This invention provides a technical solution: a two-stage condensation and dehydration device for online monitoring of flue gas, comprising a sampling pump 4, a filter 6, a primary condenser 8, a secondary condenser 9, and a collection hopper 10. The top of the sampling pump 4 is connected to a sampling pipe 2, which provides power for flue gas extraction. The sampling pipe 2 is responsible for transporting flue gas from the flue. A heat tracing sleeve assembly 3 is fitted onto the sampling pipe 2. The heat tracing sleeve assembly 3 includes a connecting rod 301, a row of metal clamps 302 on the connecting rod 301, and a heat tracing tape 303 inside the metal clamps 302. The metal clamps 302 are C-shaped clamps with one side open. The sampling tube 2 is set up in a C-shape, with the heating cable 303 attached to the inner wall of the metal hoop 302. A row of connecting rods 301 is attached to the outer wall of the sampling tube 2. The heating sleeve assembly 3 is conveniently fixed by the C-shaped metal hoop 302. The heating cable 303 is attached to the sampling tube 2 for heating and heat preservation. The bending design of the L-shaped sampling tube 2 ensures that there are no dead angles in the heat tracing throughout the process. The sampling tube 2 is set in an "L" shape, and the heating sleeve assembly 3 is set in a bent shape. The bending shape of the heating sleeve assembly 3 matches the "L" shape of the sampling tube 2, which can prevent the flue gas from condensing due to the temperature drop during the transmission process and prevent the loss of pollutants by dissolution.

[0040] The filter 6 and the primary condenser 8 are connected by a second conveying pipe 7. The primary condenser 8 includes a shell 801. A spiral guide fluid 802 is installed at one end inside the shell 801. Baffles 803 are staggered on the inner wall of the shell 801. The spiral guide fluid 802 is arranged in the shape of spiral blades. The spiral guide fluid 802 guides the flue gas to rotate and generate centrifugal force, which initially separates large-diameter condensate droplets. The two ends of the spiral guide fluid 802 are fixed inside the shell 801 by a central shaft. The baffles 803 are located outside the spiral guide fluid 802. There are four baffles 803. The four baffles 803 are arranged in a cross shape. The baffles 803 change the flue gas flow direction to form turbulence, increase the gas-liquid contact area, realize rapid water removal in primary condensation, shorten the residence time of flue gas in the condensation chamber, reduce the contact dissolution of SO2 and condensate, and improve the initial water removal efficiency.

[0041] The bottom of the secondary condenser 9 is connected to the liquid collection hopper 10. A peristaltic pump 11 is installed at the bottom of the liquid collection hopper 10. One end of the peristaltic pump 11 is connected to the drain pipe 12 to guide the two-stage condensate to converge. One end of the primary condenser 8 is connected to the secondary condenser 9. The bottom of the secondary condenser 9 has a drain port. The top of the liquid collection hopper 10 is connected to the drain port. The liquid collection hopper 10 is shaped like a frustum with openings at both the top and bottom to guide the two-stage condensate to converge. A guide groove is provided on the inner wall of the liquid collection hopper 10. The liquid collection hopper 10 and the peristaltic pump 11 are connected to the drain pipe 12 through a one-way valve. The one-way valve prevents the backflow of the discharged acidic waste liquid, can efficiently collect condensate and quickly discharge it, avoid acidic waste liquid from lingering in the equipment and corroding the parts, and ensure the stable operation of the drainage system.

[0042] The sampling pump 4 and the filter 6 are connected by a first delivery pipe 5. One end of the filter 6 is connected to a second delivery pipe 7. The filter 6 filters impurities from the extracted flue gas. The filter 6 is connected to one end of the first-stage condenser 8 through the second delivery pipe 7. The first and second delivery pipes realize the orderly transmission of flue gas from the sampling pump 4 to the filter 6 and then to the first-stage condenser 8, ensuring smooth flue gas flow and preventing dust, particulate matter and other impurities in the flue gas from entering the subsequent condensation chamber, preventing blockage of the spiral guide fluid 802 and the baffle 803, and ensuring the normal operation of the condensation system.

[0043] The top of the secondary condenser 9 is connected to a third delivery pipe 13. The secondary condenser 9 is a plate condenser. The third delivery pipe 13 delivers dry flue gas after two stages of condensation and dehydration. One end of the third delivery pipe 13 is connected to a flow controller 14. The flow controller 14 precisely regulates the amount of flue gas entering the gas detector 15. The flow controller 14 is equipped with a gas delivery pipe, which is connected to the gas detector 15. The bottom of the gas detector 15 is connected to an exhaust pipe 16. The gas detector 15 completes pollutant analysis, and the exhaust pipe 16 discharges the analyzed waste gas, ensuring a stable sample gas flow rate into the detector and improving the accuracy of monitoring data. The gas detector 15 is installed inside the cabinet 1, and one end of the exhaust pipe 16 passes through the cabinet 1 while the other end extends outside the cabinet 1 through a through hole.

[0044] A two-stage condensate removal device for online monitoring of flue gas, the method of using the above device includes the following steps:

[0045] The first step is to set the heat tracing temperature of the heat tracing jacket assembly 3, the cooling temperature of the first-stage condenser 8 and the second-stage condenser 9 through the control system, and calibrate the target air intake of the flow controller 14.

[0046] The second step is to start the sampling pump 4 and extract flue gas from the flue through the sampling tube 2.

[0047] The third step involves the heating cable 303 continuously generating heat, which is then conducted to the entire sampling tube 2 via the metal clamp 302 to prevent condensation of the flue gas during transmission.

[0048] The fourth step is that the extracted flue gas enters the filter 6 through the first conveying pipe 5. The filter element inside the filter 6 filters out impurities such as dust, particulate matter and ammonium salt crystals in the flue gas. The filtered flue gas is then conveyed to the first-stage condenser 8 through the second conveying pipe 7.

[0049] In the fifth step, the flue gas enters the first-stage condenser 8 and first flows through the spiral guide 802. Under the guidance of the spiral blades, it generates a rotational motion. Using centrifugal force, most of the large-diameter condensate droplets in the flue gas are thrown towards the inner wall of the outer shell 801. After rotation, the flue gas continues to flow through the cross-shaped baffles 803. The flue gas flow direction changes and turbulence is formed, which further increases the gas-liquid contact area and enhances the condensation and separation of small-diameter water droplets. After the initial water removal, the flue gas flows to the second-stage condenser 9.

[0050] Step 6: Secondary condenser 9 performs deep dehumidification at a lower temperature to remove residual tiny droplets and ensure that the moisture content of the outlet flue gas meets the gas detection accuracy requirements.

[0051] Step 7: The generated condensate flows into the collection hopper 10 at the bottom of the secondary condenser 9. The frustum-shaped structure and the inner wall guide groove guide the condensate to quickly converge to the bottom. Start the peristaltic pump 11. The condensate enters the drain pipe 12 through the one-way valve and is discharged. The one-way valve prevents acidic condensate from flowing back and corroding the internal parts of the equipment.

[0052] In the eighth step, the flue gas after two-stage condensation and dehydration enters the flow controller 14 through the third delivery pipe 13. Under the precise adjustment of the flow controller 14, the flue gas enters the gas detector 15 through the gas delivery pipe at a stable flow rate. The gas detector 15 analyzes and detects the pollutants in the flue gas, generates monitoring data, and the exhaust gas after the analysis is completed is discharged in compliance with regulations through the exhaust pipe 16.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalent elements of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0054] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A two-stage condensation and dehydration device for online monitoring of flue gas, comprising a sampling pump (4), a filter (6), and a primary condenser (8), wherein the top of the sampling pump (4) is connected to a sampling tube (2), a heat tracing sleeve assembly (3) is fitted on the sampling tube (2), the heat tracing sleeve assembly (3) includes a connecting rod (301), a row of metal hoops (302) is provided on the connecting rod (301), a heat tracing tube (303) is provided inside the metal hoops (302), the filter (6) and the primary condenser (8) are connected by a second conveying pipe (7), the primary condenser (8) includes a shell (801), a spiral guide fluid (802) is installed at one end inside the shell (801), and baffles (803) are staggered on the inner wall of the shell (801); It also includes a secondary condenser (9) and a liquid collection hopper (10). The bottom end of the secondary condenser (9) is connected to the liquid collection hopper (10). A peristaltic pump (11) is provided at the bottom end of the liquid collection hopper (10). One end of the peristaltic pump (11) is connected to a drain pipe (12).

2. The two-stage condensate removal device for online monitoring of flue gas according to claim 1, characterized in that: The metal hoop (302) is set in a "C" shape with an opening on one side. The heat tracing cable (303) is attached to the inner wall of the metal hoop (302). A row of connecting rods (301) is attached to the outer wall of the sampling tube (2).

3. A two-stage condensate removal device for online monitoring of flue gas according to claim 2, characterized in that: The sampling tube (2) is arranged in an "L" shape, and the heat tracing sleeve assembly (3) is arranged in a bent shape. The bent shape of the heat tracing sleeve assembly (3) matches the "L" shape of the sampling tube (2).

4. A two-stage condensate removal device for online monitoring of flue gas according to claim 1, characterized in that: The sampling pump (4) and the filter (6) are connected by a first delivery pipe (5), one end of the filter (6) is connected to a second delivery pipe (7), and the filter (6) is connected to one end of the first-stage condenser (8) through the second delivery pipe (7).

5. A two-stage condensate removal device for online monitoring of flue gas according to claim 1, characterized in that: The spiral guide fluid (802) is arranged in the shape of a spiral blade, and the two ends of the spiral guide fluid (802) are fixed inside the outer shell (801) through the central shaft.

6. The two-stage condensate removal device for online monitoring of flue gas according to claim 5, characterized in that: The baffle (803) is located outside the spiral guide fluid (802), and there are four baffles (803) arranged in a cross shape.

7. A two-stage condensate removal device for online monitoring of flue gas according to claim 1, characterized in that: One end of the primary condenser (8) is connected to the secondary condenser (9), and the bottom of the secondary condenser (9) is provided with a drain port. The top of the liquid collecting hopper (10) is connected to the drain port.

8. A two-stage condensate removal device for online monitoring of flue gas according to claim 7, characterized in that: The liquid collection hopper (10) is a frustum-shaped structure with openings at both the top and bottom. The inner wall of the liquid collection hopper (10) is provided with a guide groove. The liquid collection hopper (10) and the peristaltic pump (11) are connected to the drain pipe (12) through a one-way valve.

9. A two-stage condensate removal device for online monitoring of flue gas according to claim 1, characterized in that: The top of the secondary condenser (9) is connected to a third delivery pipe (13), and one end of the third delivery pipe (13) is connected to a flow controller (14).

10. A two-stage condensate removal device for online monitoring of flue gas according to claim 9, characterized in that: The flow controller (14) is provided with a gas supply pipe, and the flow controller (14) is connected to the gas detector (15) through the gas supply pipe. The bottom end of the gas detector (15) is connected to an exhaust pipe (16).

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