Denitration outlet NOX concentration field measurement and control device

Abstract

The utility model discloses a denitration outlet NOX concentration field measurement and control device which comprises an NOX analyzer, one end of the NOX analyzer is provided with a gas inlet pipe in a penetrating mode, the gas inlet pipe is provided with a sucking pump, the other end of the gas inlet pipe is fixedly connected with a first sealing ring, the gas inlet pipe penetrates through the first sealing ring and is inwards provided with a butt joint pipe, and the butt joint pipe is fixedly connected with a second sealing ring. A branch pipe is correspondingly arranged on the butt joint pipe, a second sealing ring is fixedly connected to the branch pipe, and the first sealing ring is arranged at the gas inlet end of the NOX analyzer and can quickly correspond to the second sealing ring on the denitration outlet branch pipe, so that the NOX analyzer and the denitration outlet branch pipe are quickly connected; and under the action of the sucking pump and the first control valve, sampling can be carried out from the NOX measuring point of the denitration outlet, and the NOX can be conveyed to the NOX measuring analyzer to be measured and analyzed, so that the measurement of each measuring point of the NOX at the denitration outlet can be realized, and the whole equipment can shorten the ammonia spraying adjusting and measuring time, reduce the measuring labor intensity and facilitate multiple times of measurement so as to ensure the adjusting effect.

Description

Technical Field

[0001] The utility model relates to the field of environmental protection denitration, and particularly relates to a device for measuring and controlling the NOX concentration field at the denitration outlet. Background Art

[0002] Since the unit may cause changes in the flue gas flow fields at the inlet and outlet of denitration under different load conditions and different operating modes of the coal pulverizing system, the ammonia injection grid may have uneven ammonia injection, local over-injection and under-injection phenomena, which affect the denitration effect. At the same time, it causes an increase in the ammonia escape concentration at the denitration outlet, an increase in the differential pressure of the air preheater and the bag filter, and affects the safe, stable and economic operation of the unit. To reduce the ammonia escape concentration of denitration for each unit, prevent the blockage of the air preheater, prevent the increase in the differential pressure of the bag filter, and reduce the consumption of liquid ammonia, it is particularly important to regularly conduct tests on the NOx concentration at the outlet under different flue gas flow fields of denitration and adjust the ammonia injection grid. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a device for measuring and controlling the NOX concentration field at the denitration outlet, which solves the problems in the prior art that the connection between the NOX analyzer and the equipment is cumbersome, time-consuming and laborious during measurement and control, and the cost of the entire measurement and control device is high.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme. A device for measuring and controlling the NOX concentration field at the denitration outlet includes a NOX analyzer. One end of the NOX analyzer is provided with an intake pipe running through it. An air extraction pump is arranged on the intake pipe. The other end of the intake pipe is fixedly connected with a first sealing ring. The intake pipe runs through the first sealing ring and is provided with a docking pipe inward. A branch pipe is correspondingly arranged on the docking pipe;

[0005] The branch pipe is fixedly connected with a second sealing ring. The first sealing ring and the second sealing ring correspond to each other. The upper and lower ends of the first sealing ring are fixedly connected with first sealing members. The second sealing ring is correspondingly fixedly connected with second sealing members. Positioning screw holes are opened on both the first sealing ring and the second sealing ring.

[0006] As a further description of the above technical scheme: A limiting groove is opened inside the first sealing member, and a positioning groove is opened in the vertical direction of the first sealing member.

[0007] As a further description of the above technical scheme: A limiting block is fixedly connected to the outer end of the second sealing member, and a slotted hole is opened inside the limiting block.

[0008] As a further description of the above technical scheme: A spring is fixedly connected inside the slotted hole, and the other end of the spring is fixedly connected with a limiting plate.

[0009] As a further description of the above technical solution: the other end of the limiting plate is fixedly connected with a positioning block, and the positioning block penetrates through the slotted opening and corresponds to the positioning groove outward.

[0010] As a further description of the above technical solution: a first control valve is arranged on the branch pipe, an air outlet pipe penetrates through the other end of the NOX analyzer, and a second control valve is arranged on the air outlet pipe.

[0011] As a further description of the above technical solution: a controller is arranged outside the NOX analyzer, and an alarm lamp is arranged at one end above the NOX analyzer.

[0012] The utility model has the following beneficial effects:

[0013] 1. Compared with the prior art, the NOX concentration field measurement and control device at the denitration outlet can quickly correspond to the second sealing ring on the denitration outlet branch pipe through the first sealing ring arranged at the air inlet end of the NOX analyzer, so as to quickly connect the two, and under the action of the air extraction pump and the first control valve, it can sample from the NOX measuring point at the denitration outlet and transport it to the NOX measuring and analyzing instrument for NOX measurement and analysis, thus realizing the measurement of each measuring point of NOX at the denitration outlet. The whole device can shorten the measurement time of ammonia injection adjustment, reduce the labor intensity of measurement, and facilitate multiple measurements to ensure the adjustment effect;

[0014] 2. Compared with the prior art, the NOX concentration field measurement and control device at the denitration outlet can quickly dock the inlet pipe and the branch pipe by setting the positioning block, positioning groove, limiting block and limiting groove, which is convenient for the subsequent disassembly and replacement by the staff. At the same time, the NOX analyzer can give an alarm when the analysis is abnormal, improve the staff, and improve the practicability of the device.

[0015] The additional aspects and advantages of the utility model will be partly given in the following description, partly will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further illustrates the utility model with reference to the drawings and embodiments;

[0017] Figure 1 is the overall structural schematic diagram of the utility model.

[0018] Figure 2 is the internal structural schematic diagram of the limiting block of the utility model.

[0019] Figure 3 is the side view of the utility model.

[0020] Figure 4 is the front view of the utility model.

[0021] Legend:

[0022] 1. NOX analyzer; 2. Controller; 3. First sealing ring; 4. First seal; 5. Limit groove; 6. Second seal; 7. Positioning screw hole; 8. Branch pipe; 9. First control valve; 10. Docking pipe; 11. Second sealing ring; 12. Positioning groove; 13. Air inlet pipe; 14. Alarm lamp; 15. Limit block; 16. Spring; 17. Groove; 18. Limit plate; 19. Positioning block; 20. Air outlet pipe; 21. Second control valve; 22. Air extraction pump. Detailed implementation manners

[0023] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the drawings. The role of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be construed as a limitation on the protection scope of the present invention.

[0024] Referring to Figures 1-4 , an embodiment provided by the present invention, a device for measuring and controlling the NOX concentration field at the denitration outlet, includes a NOX analyzer 1. The NOX analyzer used in this device is a TM 42i-TL type trace NOX analyzer, which measures the content of nitrogen oxides in the air by the chemiluminescence method, and the analysis ability ranges from the sub-ppb level to the upper limit of 1000 ppb. The 42i-TL type adopts a single reaction chamber and single photomultiplier tube design, and can cycle between NO, NOX and zero modes. One end of the NOX analyzer 1 is provided with an air inlet pipe 13 in a penetrating manner, an air extraction pump 22 is arranged on the air inlet pipe 13, the other end of the air inlet pipe 13 is fixedly connected with a first sealing ring 3, the air inlet pipe 13 penetrates through the first sealing ring 3 and is provided with a docking pipe 10 inward, a branch pipe 8 is correspondingly arranged on the docking pipe 10, the branch pipe 8 is fixedly connected to the denitration port of the equipment, and a plurality of branch pipes 8 can be arranged, so as to achieve the purpose of multi-point measurement;

[0025] A second sealing ring 11 is fixedly connected to the branch pipe 8. The first sealing ring 3 corresponds to the second sealing ring 11. First sealing members 4 are fixedly connected to the upper and lower ends of the first sealing ring 3. Second sealing members 6 are fixedly connected to the corresponding positions on the second sealing ring 11. Positioning screw holes 7 are provided on both the first sealing ring 3 and the second sealing ring 11. A limiting groove 5 is provided inside the first sealing member 4, and a positioning groove 12 is provided in the vertical direction of the first sealing member 4. A limiting block 15 is fixedly connected to the outer end of the second sealing member 6. An opening groove 17 is provided inside the limiting block 15. A spring 16 is fixedly connected inside the opening groove 17. The other end of the spring 16 is fixedly connected to a limiting plate 18. The other end of the limiting plate 18 is fixedly connected to a positioning block 19. The positioning block 19 passes through the opening groove 17 and corresponds to the positioning groove 12 outward. The first sealing ring 4 and the second sealing ring 11 at the port are corresponded. Press the positioning block 19 on the limiting block 15 inward, so that the positioning block 19 contracts inward. At this time, the limiting block 15 is sent into the limiting groove 5. When the positioning block 19 passes through the position of the positioning groove 12, the internal spring 16 can make it pop out outward and be clamped with it, so as to realize the quick docking operation of the intake pipe 13 and the branch pipe 8. At the same time, the positioning screw holes 7 at both ends can correspond to the positioning bolts, so as to realize its double locking and sealing, improving the sealing performance of the device;

[0026] A first control valve 9 is provided on the branch pipe 8. The other end of the NOX analyzer 1 is provided with an air outlet pipe 20 in a penetrating manner. A second control valve 21 is provided on the air outlet pipe 20. The air outlet operation can be controlled by passing through the second control valve 12. A controller 2 is provided on the outside of the NOX analyzer 1. An alarm lamp 14 is provided at the upper end of the NOX analyzer 1. A display screen assembly is provided on the controller 2, which can facilitate the staff to observe the measurement and control results. The NOX analyzer 1 can give an alarm when the analysis is abnormal, improving the staff and the practicality of the device.

[0027] Working principle: When the device is in use, the branch pipe 8 at the outlet of the equipment denitration is corresponded to the intake pipe 13 on the NOX analyzer 1. At this time, the first sealing ring 4 and the second sealing ring 11 at the port are corresponded. Press the positioning block 19 on the limit block 15 inward, so that the positioning block 19 shrinks inward. At this time, the limit block 15 is sent into the inside of the limit groove 5. When the positioning block 19 passes through the positioning groove 12, the internal spring 16 can make it pop out outward and engage with it, so as to realize the quick docking operation of the intake pipe 13 and the branch pipe 8. At the same time, the positioning screw holes 7 at both ends can be corresponded to the positioning bolts, so as to realize its double locking and sealing, improve the sealing performance of the device. When it is necessary to measure and control the NOX concentration field, under the action of the air extraction pump 22 and the first control valve 9, samples can be taken from the NOX measurement points at the denitration outlet and transported to the NOX measurement analyzer 1 for measurement and analysis of NOX, so as to realize the measurement of each NOX measurement point at the denitration outlet. The whole device can shorten the ammonia injection adjustment measurement time, reduce the measurement labor intensity, and facilitate multiple measurements to ensure the adjustment effect.

[0028] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art in the said technical field, various changes can also be made without departing from the purpose of the present invention.

Claims

1. A NOx concentration field measurement and control device at a denitration outlet, comprising a NOx analyzer (1), characterized in that: An intake pipe (13) is provided through one end of the NOx analyzer (1), an air extraction pump (22) is provided on the intake pipe (13), a first sealing ring (3) is fixedly connected to the other end of the intake pipe (13), a butt pipe (10) is provided inwardly of the intake pipe (13) through the first sealing ring (3), and a branch pipe (8) is correspondingly provided on the butt pipe (10); The branch pipe (8) is fixedly connected to a second sealing ring (11); the first sealing ring (3) and the second sealing ring (11) correspond to each other; the upper and lower ends of the first sealing ring (3) are fixedly connected to a first sealing member (4); the second sealing ring (11) is correspondingly fixedly connected to a second sealing member (6); and positioning screw holes (7) are provided on both the first sealing ring (3) and the second sealing ring (11).

2. A denitration outlet NOx concentration field measurement and control device according to claim 1, characterized in that: A limiting groove (5) is provided inside the first sealing member (4), and a positioning groove (12) is provided in the vertical direction of the first sealing member (4).

3. A denitration outlet NOx concentration field measurement and control device according to claim 1, characterized in that: The outer end of the second sealing member (6) is fixedly connected to a limit block (15), and a groove (17) is provided inside the limit block (15).

4. A denitration outlet NOx concentration field measurement and control device according to claim 3, characterized in that: A spring (16) is fixedly connected inside the slot (17), and the other end of the spring (16) is fixedly connected to a limiting plate (18).

5. A denitration outlet NOx concentration field measurement and control device according to claim 4, characterized in that: The other end of the limiting plate (18) is fixedly connected with a positioning block (19), and the positioning block (19) penetrates the slot (17) and corresponds to the positioning slot (12) outward.

6. A denitration outlet NOx concentration field measurement and control device according to claim 1, characterized in that: The branch pipe (8) is provided with a first control valve (9), and the other end of the NOx analyzer (1) is penetrated by an outlet pipe (20), and the outlet pipe (20) is provided with a second control valve (21).

7. A denitration outlet NOx concentration field measurement and control device according to claim 1, characterized in that: A controller (2) is arranged on the outside of the NOx analyzer (1), and an alarm light (14) is arranged on the upper end of the NOx analyzer (1).

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