A boiler flue gas pressure sampling device

Abstract

This invention discloses a boiler flue gas pressure sampling device in the field of flue gas sampling technology, including a pressure transmitter, an information processor, and a sampling detection chamber. A sampling tube is fixedly installed at the bottom of the sampling detection chamber, and the lower end of the sampling tube is introduced into the boiler cavity, with a sampling probe fixedly installed at the lower end. An internal flushing component is provided inside the sampling tube, including: a water guide pipe, which is composed of a telescopic hose and a fixed connecting pipe, wherein the upper end of the fixed connecting pipe extends from the upper end of the sampling detection chamber, and the lower end of the telescopic hose is located inside the sampling tube and has a flushing head fixedly installed; a water accumulator, which is fixedly installed at the lower end of the sampling tube, with a solenoid valve installed at the upper end of the water accumulator; and a control component is provided between the sampling probe and the flushing head, which enables the sampling probe and the flushing head to form a sealed space. This invention improves boiler safety, optimizes protection logic, can automatically clean the internal pipes of the sampling device, and increases the service life of the sampling equipment.

Description

Technical Field

[0001] This invention relates to the field of flue gas sampling technology, specifically to a boiler flue gas pressure sampling device. Background Technology

[0002] Existing boiler flue gas pressure sampling methods mostly involve connecting a pressure sampling cylinder to a sampling pipe. When the pressure reaches the protection setpoint, the pressure switch activates. The logic typically uses a "two-out-of-three" approach to trigger the boiler's MFT (Main Fuel Trip). This secondary protection logic is configured with three measurement points, three circuits, and three completely independent switches to avoid common risks such as concentrated installation damage or simultaneous power outages. However, the three circuits are completely independent and lack mutual verification, making the output signal prone to errors. Furthermore, since the pressure switch is not a smart transmitter, blockages or leaks in the sampling pipeline may not be detected by operators in a timely manner on the monitoring screen, posing a significant safety hazard. Summary of the Invention

[0003] The technical problem of this invention is to provide a boiler flue gas pressure sampling device to improve boiler safety, optimize protection logic, automatically clean the internal pipes of the sampling device, and increase the service life of the sampling equipment.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a boiler flue gas pressure sampling device, comprising a pressure transmitter, an information processor, and a sampling detection chamber, wherein a sampling tube is fixedly installed at the bottom of the sampling detection chamber, the lower end of the sampling tube is introduced into the boiler cavity, and a sampling probe is fixedly installed at the lower end; an internal flushing component is provided inside the sampling tube, the internal flushing component comprising: The water guide pipe is composed of a telescopic hose and a fixed connecting pipe, wherein the upper end of the fixed connecting pipe extends from the upper end of the sampling and detection chamber, and the lower end of the telescopic hose is located inside the sampling pipe and is fixedly installed with a flushing head. A water-collecting airbag is fixedly installed at the lower end of the sampling tube. A solenoid valve is provided at the upper end of the water-collecting airbag. A control component is provided between the sampling probe and the flushing head. The control component enables the sampling probe and the flushing head to form a sealed space.

[0005] As a further embodiment of the present invention, the control component includes a movable baffle and a movable component. The movable component and the movable baffle are fixedly connected by a connecting rod. The edges of the movable component and the movable baffle can fit against the inner wall of the sampling tube. The movable baffle is connected to the sampling probe by a telescopic rod. When the telescopic rod is retracted, the movable baffle fits against the sampling probe, and the lower end of the sampling tube is sealed at this time.

[0006] As a further embodiment of the present invention, the rinsing head includes a spray ring, which is fixedly connected to the lower end of the telescopic hose through a multi-group diversion pipe. The outer side of the spray ring is provided with a multi-group spray hole, and the water in the water guide pipe can enter the spray ring through the diversion pipe.

[0007] As a further embodiment of the present invention, multiple sets of filling plugs are fixedly installed on the movable component. The filling plugs can fill the gap between the spray ring and the diversion pipe. When the telescopic rod retracts, the movable baffle moves and pulls the filling plugs of the movable component to fill the spray ring through the connecting rod.

[0008] As a further embodiment of the present invention, a water storage tank is fixedly installed on the upper surface of the sampling and detection chamber, the upper end of the fixed connecting pipe is introduced into the water storage tank, and a detector is fixedly installed on the upper end of the sampling and detection chamber.

[0009] As a further embodiment of the present invention, each set of sampling detection chambers and sampling tubes forms a set of detection units. The boiler detection equipment is provided with four sets of detection units: Unit 1, Unit 2, Unit 3 and Unit 4. Unit 1 and Unit 2 form the first detection group, and Unit 3 and Unit 4 form the second detection group. The first detection group and the second detection group adopt a redundancy protection mechanism of taking two out of four and first "OR" then "AND".

[0010] As a further embodiment of the present invention, the cable signal of the pressure transmitter is connected to an AI card and a protection threshold is set. The threshold is set with multiple threshold ranges such as high pressure, high-high pressure, low pressure, and low-low pressure.

[0011] As a further embodiment of the present invention, the device protection triggering system can issue an alarm after receiving information about high and low pressure from the information processor, and trigger trip protection after receiving information about high-high and low-low pressure.

[0012] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, a sealed section is formed inside the sampling tube by a control component, so that the inner wall of the sampling tube can be automatically cleaned within the sealed section, avoiding the accumulation of impurities on the inner wall of the sampling tube that may affect the sampling operation, avoiding frequent replacement of the sampling equipment, and improving the service life of the sampling equipment.

[0013] 2. In this invention, the four-out-of-two redundancy protection mechanism first "OR" then "AND" means that after any one of the units in unit one or unit two detects an abnormality, the first detection group determines that the air pressure is abnormal. After any one of the units in unit three or unit four detects an abnormality, the second detection group determines that the air pressure is abnormal. Only when both the first and second detection groups determine that the air pressure is abnormal will the protection device trigger system to trigger an alarm and trip protection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a flowchart of the sampling and detection process in this invention; Figure 2 This is a schematic diagram of the protection triggering principle in this invention; Figure 3 This is a schematic diagram of the sampling device structure in this invention; Figure 4 This is a schematic diagram of the internal flushing component structure in this invention; Figure 5 This is a cross-sectional view of the sampling device in this invention.

[0016] The attached diagram lists the components represented by each number as follows: 1. Sampling and detection chamber; 2. Water storage tank; 3. Detector; 4. Sampling tube; 5. Water accumulation airbag; 6. Water guide pipe; 601. Telescopic hose; 602. Fixed connecting pipe; 603. Spray ring; 604. Diverter pipe; 7. Moving parts; 701. Filler plug; 8. Sampling probe; 9. Movable baffle; 10. Telescopic rod; 11. Connecting rod. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-5 This invention provides a technical solution: a boiler flue gas pressure sampling device, comprising a pressure transmitter, an information processor, and a sampling detection chamber 1. A sampling tube 4 is fixedly installed at the bottom of the sampling detection chamber 1. The lower end of the sampling tube 4 is introduced into the boiler cavity, and a sampling probe 8 is fixedly installed at the lower end. An internal flushing component is provided inside the sampling tube 4, comprising: The water guide pipe 6 is composed of a telescopic hose 601 and a fixed connecting pipe 602. The upper end of the fixed connecting pipe 602 extends from the upper end of the sampling and detection chamber 1, and the lower end of the telescopic hose 601 is located inside the sampling pipe 4 and is fixedly installed with a flushing head. The water-accumulating airbag 5 is fixedly installed at the lower end of the sampling tube 4. A solenoid valve is provided at the upper end of the water-accumulating airbag 5. A control component is provided between the sampling probe 8 and the flushing head. The control component enables the sampling probe 8 and the flushing head to form a sealed space.

[0019] During operation, this invention replaces the traditional safety switch with a pressure transmitter. The boiler flue gas pressure is detected through the sampling detection chamber 1. During detection, the flue gas enters the sampling detection chamber 1 through the sampling pipe 4. Pressure information is acquired through the sampling detection chamber 1 and analyzed by the pressure transmitter and information processor to determine if it falls within a set threshold. In this invention, both the sampling probe 8 and the flushing head are in a ventilated state during flue gas pressure detection, allowing the flue gas to enter the sampling detection chamber 1 through the sampling pipe 4. When cleaning the sampling pipe 4 is required, the control component closes both the sampling probe 8 and the flushing head, creating a sealed section at one end inside the sampling pipe 4. Clean water is then guided through the water guide pipe 6. Water is sprayed onto the inner wall of the sampling tube 4 through the flushing head, cleaning the inner wall. After cleaning, the overflowing water enters the sealed section. As water accumulates, it squeezes the flushing head, causing the telescopic hose 601 to contract and the flushing head to move upwards, thus thoroughly flushing the sampling tube 4. When the flushing head reaches its highest point, the solenoid valve opens, allowing the accumulated wastewater in the sampling tube 4 to enter the water-collecting airbag 5, automatically collecting the wastewater. Throughout the cleaning process, the wastewater remains below the flushing head. The flushing head forms a sealed barrier between the sampling tube 4 and the sampling detection chamber 1, preventing wastewater from overflowing into the sampling detection chamber 1 and interfering with the detection instruments within it. In this invention, a sealed section is formed within the sampling tube 4 by a control component, enabling automatic flushing of the inner wall of the sampling tube 4 within this sealed section. This prevents the accumulation of impurities on the inner wall of the sampling tube 4 from affecting the sampling operation, avoids frequent replacement of sampling equipment, and extends the service life of the sampling equipment.

[0020] As a further embodiment of the present invention, the control component includes a movable baffle 9 and a movable component 7. The movable component 7 and the movable baffle 9 are fixedly connected by a connecting rod 11. The edges of the movable component 7 and the movable baffle 9 can fit against the inner wall of the sampling tube 4. The movable baffle 9 is connected to the sampling probe 8 by a telescopic rod 10. When the telescopic rod 10 is retracted, the movable baffle 9 fits against the sampling probe 8, and the lower end of the sampling tube 4 is sealed at this time.

[0021] During operation, both the movable baffle 9 and the sampling probe 8 in this invention are provided with through holes. When the movable baffle 9 and the sampling probe 8 are in contact, their through holes do not overlap at all, forming a sealing plate that closes the end of the sampling tube 4. The telescopic rod 10 retracts, pulling the connecting rod 11. The connecting rod 11 drives the movable part 7 to move down, so that the movable part 7 is embedded in the flushing head. After the movable part 7 and the flushing head are embedded, a sealing plug is also formed, thereby forming a sealed section in the sampling tube 4.

[0022] As a further embodiment of the present invention, the rinsing head includes a spray ring 603, which is fixedly connected to the lower end of the telescopic hose 601 via a multi-group diversion pipe 604. Multiple spray holes are provided on the outer side of the spray ring 603, and water in the water guide pipe 6 can enter the spray ring 603 through the diversion pipe 604.

[0023] During operation, the spray ring 603 and the diversion tube 604 form a flushing head in this invention. After the movable part 7 is embedded in the gap of the diversion tube 604, the overlapping spray ring 603 and the movable part 7 form a sealing plug, which can separate the sampling tube 4.

[0024] As a further embodiment of the present invention, multiple sets of filling plugs 701 are fixedly installed on the movable part 7. The filling plugs 701 can fill the gap between the spray ring 603 and the diversion pipe 604. When the telescopic rod 10 retracts, the movable baffle 9 moves and pulls the filling plugs 701 of the movable part 7 into the spray ring 603 through the connecting rod 11.

[0025] During operation, the filling plug 701 in this invention has elasticity (e.g., Figure 4 As shown), the elastic filler plug 701 can be inserted into the diverter pipe 604, and the movable part 7 is sleeved on the outside of the telescopic hose 601. When the movable part 7 overlaps with the spray ring 603, the middle position of the movable part 7 can fit with the middle part of the spray ring 603.

[0026] As a further embodiment of the present invention, a water storage tank 2 is fixedly installed on the upper surface of the sampling and detection chamber 1, the upper end of the fixed connecting pipe 602 is introduced into the water storage tank 2, and a detector 3 is fixedly installed on the upper end of the sampling and detection chamber 1.

[0027] During operation, the water storage tank 2 stores clean water, which enters the diversion pipe 604 through the fixed connecting pipe 602 and the telescopic hose 601, and then enters the spray ring 603 through the diversion pipe 604. The detector 3 can detect the air pressure in the sampling detection chamber 1. As a further embodiment of the present invention, each set of sampling detection chamber 1 and sampling tube 4 forms a set of detection units. The boiler detection equipment is provided with four sets of detection units: Unit 1, Unit 2, Unit 3 and Unit 4. Unit 1 and Unit 2 form the first detection group, and Unit 3 and Unit 4 form the second detection group. The first detection group and the second detection group adopt a redundancy protection mechanism of taking two out of four and first "OR" then "AND".

[0028] During operation, the redundancy protection mechanism of the four-out-of-two choice operation, which first performs an "OR" operation and then an "AND" operation, is as follows: Figure 2 As shown, if any one of the units in Unit 1 or Unit 2 detects an abnormality, the first detection group will determine that the air pressure is abnormal. If any one of the units in Unit 3 or Unit 4 detects an abnormality, the second detection group will determine that the air pressure is abnormal. Only when both the first and second detection groups determine that the air pressure is abnormal will the protection device trigger system to trigger an alarm and trip protection.

[0029] As a further embodiment of the present invention, the cable signal of the pressure transmitter is connected to an AI card, and a protection threshold is set. The threshold is set with multiple threshold ranges such as high pressure, high-high pressure, low pressure, and low-low pressure.

[0030] During operation, this invention connects the original DI card to the AI ​​card, transforming the simple "on" and "off" information into threshold information for judgment, thereby enabling the device to continuously acquire information.

[0031] As a further embodiment of the present invention, the equipment protection triggering system can issue an alarm after receiving information about high and low pressure from the information processor, and trigger trip protection after receiving information about high-high and low-low pressure.

Claims

1. A boiler flue gas pressure sampling device, comprising a pressure transmitter, an information processor, and a sampling and detection chamber (1), characterized in that: A sampling tube (4) is fixedly installed at the bottom of the sampling and detection chamber (1). The lower end of the sampling tube (4) is inserted into the boiler chamber, and a sampling probe (8) is fixedly installed at the lower end. An internal flushing component is provided inside the sampling tube (4), which includes: Water guide pipe (6), the water guide pipe (6) is spliced ​​from a telescopic hose (601) and a fixed connecting pipe (602), wherein the upper end of the fixed connecting pipe (602) is led out from the upper end of the sampling detection chamber (1), and the lower end of the telescopic hose (601) is located inside the sampling pipe (4) and is fixedly installed with a flushing head; Water-accumulating airbag (5), the water-accumulating airbag (5) is fixedly installed at the lower end of the sampling tube (4), the upper end of the water-accumulating airbag (5) is provided with a solenoid valve, and a control component is provided between the sampling probe (8) and the flushing head, the control component can make the sampling probe (8) and the flushing head form a sealed space.

2. The boiler flue gas pressure sampling device according to claim 1, characterized in that: The control component includes a movable baffle (9) and a movable part (7). The movable part (7) and the movable baffle (9) are fixedly connected by a connecting rod (11). The edges of the movable part (7) and the movable baffle (9) can fit against the inner wall of the sampling tube (4). The movable baffle (9) is connected to the sampling probe (8) by a telescopic rod (10). When the telescopic rod (10) is retracted, the movable baffle (9) fits against the sampling probe (8), and the lower end of the sampling tube (4) is sealed at this time.

3. The boiler flue gas pressure sampling device according to claim 2, characterized in that: The rinsing head includes a spray ring (603), which is fixedly connected to the lower end of the telescopic hose (601) through a multi-group diversion pipe (604). Multiple spray holes are provided on the outer side of the spray ring (603), and the water in the water guide pipe (6) can enter the spray ring (603) through the diversion pipe (604).

4. The boiler flue gas pressure sampling device according to claim 3, characterized in that: Multiple sets of filling plugs (701) are fixedly installed on the movable part (7). The filling plugs (701) can fill the gap between the spray ring (603) and the diversion pipe (604). When the telescopic rod (10) retracts, the movable baffle (9) moves and pulls the filling plugs (701) of the movable part (7) through the connecting rod (11) to fill the spray ring (603).

5. A boiler flue gas pressure sampling device according to claim 4, characterized in that: A water tank (2) is fixedly installed on the upper surface of the sampling and detection chamber (1), and the upper end of the fixed connecting pipe (602) is introduced into the water tank (2). A detector (3) is fixedly installed on the upper end of the sampling and detection chamber (1).

6. The boiler flue gas pressure sampling device according to claim 1, characterized in that: Each set of sampling detection chambers (1) and sampling tubes (4) forms a set of detection units. The boiler detection equipment is equipped with four sets of detection units: Unit 1, Unit 2, Unit 3 and Unit 4. Unit 1 and Unit 2 form the first detection group, and Unit 3 and Unit 4 form the second detection group. The first detection group and the second detection group adopt a "two-out-of-four" or "after-the-right" redundancy protection mechanism.

7. A boiler flue gas pressure sampling device according to claim 5, characterized in that: The pressure transmitter's cable signal is connected to the AI ​​card, and a protection threshold is set. The threshold is set with multiple threshold ranges such as high pressure, high-high pressure, low pressure, and low-low pressure.

8. A boiler flue gas pressure sampling device according to claim 5, characterized in that: The equipment protection triggering system can issue an alarm after receiving high and low pressure information from the information processor, and trigger trip protection after receiving high-high and low-low pressure information.

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