Detection device for cutoff of spray gun
By installing an end-face thermal resistance detection device on the outer tube of the denitrification spray gun, the problem of uneven mixing caused by spray gun blockage was solved, the reduction efficiency was improved and the amount of reducing agent was reduced, thus realizing an economical and efficient denitrification process.
Patent Information
- Application Number
- CN202423071502.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-12
AI Technical Summary
In existing technologies, clogging of the denitrification spray gun leads to uneven mixing of the reducing agent and nitrogen oxides, reducing reduction efficiency and increasing the amount of reducing agent required.
An end-face thermal resistor and a thermal resistor fixing component are installed on the outer tube of the denitrification spray gun. An alarm signal is triggered by detecting changes in the spray gun temperature, which can promptly detect blockages and replace the spray gun, ensuring uniform mixing of the reducing agent and nitrogen oxides.
This method achieves uniform mixing of the reducing agent and nitrogen oxides, improves reduction efficiency, reduces the amount of reducing agent used, and lowers the cost of denitrification.
Smart Images
Figure CN223597230U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of detection devices of spray gun flow break, belong to environmental protection equipment technical field. BACKGROUND
[0002] SNCR technology is a kind of method without catalyst, in 850~1100 ℃ range reduces NOx, ammonia or urea is commonly used as reducing agent, reducing agent rapidly thermal decomposition and with NOx in flue gas reaction, generate nitrogen and water.SNCR spray gun is arranged in suitable temperature window, to ensure that reducing agent can be in optimum temperature window with nitrogen oxide (NOx) reaction, in order to make reducing agent and NOx in flue gas fully react, good mixing is key, when arranging multiple spray guns, reasonable layout mode is used, can use multilayer, multiple column arrangement mode, so that reducing agent can be evenly distributed on the entire flue cross section, in cement kiln, in the same position cross section generally evenly arranged multiple spray guns, so that reducing agent is evenly distributed on the cross section.When spray gun blockage occurs, reducing agent is unevenly distributed in cross section, causing reducing agent and NOx in flue gas mixing uneven, in turn lead to the reduction efficiency of NOx decline, reducing agent consumption is large, cause reducing agent waste. SUMMARY
[0003] The utility model aims at providing a kind of detection devices of spray gun flow break, solve the technical defects of the prior art in the denitration spray gun blockage, cause the mixing of reducing agent and nitrogen oxide in cyclone not uniform, reduce the reduction efficiency of nitrogen oxide is low, reducing agent consumption is large.
[0004] To solve the above problems, the technical scheme adopted by the utility model is: a detection device for spray gun flow interruption, which is installed on the outer pipe of a denitration spray gun, comprising an end face thermistor and a thermistor fixing member, the thermistor fixing member is fixed on the outer pipe of the denitration spray gun, the end face thermistor passes through the thermistor fixing member and is fixed with the thermistor fixing member, the end face of the end face thermistor is in close contact with the outer pipe of the denitration spray gun, which is used for detecting the temperature of the outer pipe of the denitration spray gun, the lead wire of the end face thermistor is connected with a patrol instrument, when the temperature of the outer pipe of the denitration spray gun detected by the end face thermistor rises to exceed the set range in the state of the denitration spray gun blockage, the patrol instrument triggers an alarm signal. When the denitration spray gun is used normally, the reducing agent and compressed air flow in the denitration spray gun, which reduces the temperature rise of the denitration spray gun caused by the transmission of high temperature in the cyclone drum to the part where the utility model is installed. When the denitration spray gun is blocked, the flow of the reducing agent and compressed air in the denitration spray gun is blocked, which weakens or eliminates the cooling function of the denitration spray gun. The part of the denitration spray gun inserted into the cyclone drum is affected by high temperature, the temperature rises, and heat is transferred to the part where the utility model is installed, which makes the temperature of the denitration spray gun installed in the part where the utility model is installed rise, so that it is detected by the end face thermistor. When the temperature exceeds the set range, the patrol instrument connected with the end face thermistor triggers an alarm signal, thereby determining that the denitration spray gun is blocked, and timely replacement is carried out, so that the mixing of the reducing agent and nitrogen oxides in the cyclone drum is more uniform, the reduction efficiency of nitrogen oxides is ensured, the amount of reducing agent is maintained, and the cost of denitration is reduced.
[0005] As a further improvement of the utility model, the thermistor fixing member comprises a first fixing member and a second fixing member, the first fixing member and the second fixing member are in close contact with the outer pipe of the denitration spray gun from both sides of the outer pipe of the denitration spray gun, and the first fixing member and the second fixing member are fixedly connected, and the end face thermistor passes through the second fixing member and is fixedly connected with the second fixing member. The thermistor fixing member in the utility model is composed of two parts, which facilitates the installation of the utility model on the outer pipe of the denitration spray gun.
[0006] As a further improvement of the utility model, a threaded hole is formed in each side of the first fixing member, a stepped through hole is formed in each side of the second fixing member, two stepped through holes correspond to two threaded holes respectively, and the first fixing member and the second fixing member are detachably connected by fastening screws passing through the stepped through holes and screwing with the threaded holes. The utility model passes through the stepped through hole and the threaded hole on the first fixing member and the second fixing member respectively, and the first fixing member and the second fixing member are detachably installed by the fastening screws passing through the stepped through hole and screwing with the threaded hole, which facilitates the installation of the utility model.
[0007] As a further improvement of the utility model, fixed through holes are arranged between the two stepped through holes on the second fixing member, the fixed through holes penetrating through both sides of the second fixing member, and the end face thermistor extends into the fixed through hole and is screwed with the fixed through hole. The utility model discloses the fixed through hole is arranged on the second fixing member, and the end face thermistor is conveniently fixedly connected with the second fixing member.
[0008] As a further improvement of the utility model, the two stepped through holes are symmetrically arranged on the left and right sides of the fixed through hole.
[0009] As a further improvement of the utility model, the cross-sectional shape of the first fixing member and the second fixing member is semicircular ring, and the inner diameter is equal to the outer diameter of the outer pipe of the denitration spray gun. The first fixing member and the second fixing member of the utility model are better attached to the outer pipe of the denitration spray gun, and are more firmly fixed.
[0010] In summary, the utility model has the beneficial effects that: the utility model detects the temperature of the outer pipe of the denitration spray gun, thereby determining whether the denitration spray gun is blocked, so that the denitration spray gun can be replaced in time or the blocked denitration spray gun can be troubleshooting, thereby ensuring that the reducing agent and nitrogen oxides are uniformly mixed in the cyclone drum, maintaining the high reduction efficiency of nitrogen oxides, and further reducing the reducing agent consumption. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 It is the structure schematic view of the utility model installed on the outer pipe of the denitration spray gun.
[0012] Figure 2 It is the A-A sectional view of Figure 1 .
[0013] Figure 3 It is the sectional view of the first fixing member in the utility model.
[0014] Figure 4 It is the three-dimensional structure schematic view of the first fixing member in the utility model.
[0015] Figure 5 It is the sectional view of the second fixing member in the utility model.
[0016] Figure 6 It is the three-dimensional structure schematic view of the second fixing member in the utility model.
[0017] Figure 7 It is the front view of the utility model used in the cyclone drum.
[0018] Figure 8 It is the plan view of the utility model used in the cyclone drum.
[0019] The components include: 1. outer tube of the denitrification spray gun; 2. end face thermal resistor; 3. thermal resistor fixing component; 4. inspection instrument; 5. first fixing component; 6. second fixing component; 7. threaded hole; 8. stepped through hole; 9. fastening screw; 10. fixing through hole; 11. cyclone tube. Detailed Implementation
[0020] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0021] like Figure 1 and Figure 2 The detection device for the spray gun flow interruption shown is installed on the outer tube 1 of the denitrification spray gun. This detection device includes an end-face thermal resistor 2 and a thermal resistor fixing component 3. The thermal resistor fixing component 3 is fixed to the outer tube 1 of the denitrification spray gun. The end-face thermal resistor 2 passes through and is fixed to the thermal resistor fixing component 3. The thermal resistor fixing component 3 is used to fix the end-face thermal resistor 2 to the outer tube 1 of the denitrification spray gun. The end face of the end-face thermal resistor 2 is in contact with the outer tube 1 of the denitrification spray gun, and is used to detect the temperature of the outer tube 1 of the denitrification spray gun. The lead wire of the end-face thermal resistor 2 is connected to the inspection instrument 4. The denitrification spray gun is installed in a suitable reaction area with a temperature range of 850–1100℃. The denitrification spray gun is subjected to high-temperature gas burning during operation, causing a rapid temperature increase. However, during operation, the flow of the reducing agent and compressed air carries away some heat, resulting in only a small amount of heat being received by the denitrification spray gun within the cyclone 11. The heat conducted to the end-face thermal resistor 2 will increase significantly when the denitrification spray gun is clogged. This will reduce the amount of reducing agent and compressed air inside the spray gun, thus decreasing its cooling capacity. Consequently, the heat conducted to the end-face thermal resistor 3 within the cyclone 11 will increase considerably, leading to a significant increase in temperature at the location where the end-face thermal resistor 2 is installed. The temperature measured by the end-face thermal resistor 2 will show a significant difference compared to the temperature of the denitrification spray gun during normal use. When the end-face thermal resistor 2 detects that the temperature of the outer tube 1 of the denitrification spray gun has risen beyond the set range, the inspection instrument 4 triggers an alarm signal. Specifically, the end-face thermal resistor 2 converts the detected temperature into a current signal and transmits it to the inspection instrument 4. When the measured value exceeds the set alarm range, the inspection instrument 4 immediately triggers an alarm signal and uploads it to the DCS system via the communication interface. The DCS system then notifies the operator to conduct on-site inspection and troubleshoot the problem.
[0022] like Figure 2As shown in the utility model, the first fixing member 5 and the second fixing member 6 are fixedly connected with the outer pipe 1 of the denitration spray gun on both sides, and the whole resistance fixing member 3 is fixed on the outer pipe 1 of the denitration spray gun, the end face thermal resistance 2 is fixedly connected with the second fixing member 6 through the second fixing member 6, and the end face thermal resistance 2 is perpendicular to the outer pipe 1 of the denitration spray gun.
[0023] As Figures 3 to 6 shown, the utility model realizes the connecting structure of the first fixing member 5 and the second fixing member 6: one threaded hole 7 is formed on both sides of the first fixing member 5, one stepped through hole 8 is formed on both sides of the second fixing member 6, two stepped through holes 8 correspond to two threaded holes 7 respectively, the first fixing member 5 and the second fixing member 6 are detachably connected by the fastening screw 9 passing through the stepped through hole 8 and being screwed with the threaded hole 7. The utility model is provided with the fixed through hole 10 between the two stepped through holes 8 on the second fixing member 6, the fixed through hole 10 is provided with internal threads, and the fixed through hole 9 penetrates the two sides of the second fixing member 6, the fixed through hole 9 is formed along the radial direction of the outer pipe 1 of the denitration spray gun, after the end face thermal resistance 2 is inserted into the fixed through hole 10 and is screwed with the fixed through hole 10, the end face thermal resistance 2 is perpendicular to the outer pipe 1 of the denitration spray gun. The two stepped through holes 8 in the utility model are symmetrically distributed on the left and right sides of the fixed through hole 10. When the utility model is installed on the outer pipe 1 of the denitration spray gun, the end face thermal resistance 2 is screwed in the fixed through hole 10 first, then the first fixing member 5 and the second fixing member 6 are placed on both sides of the outer pipe 1 of the denitration spray gun respectively, then two fastening screws 9 are used to pass through the stepped through hole 8 and are inserted into the threaded hole 7, the two fastening screws 9 are tightened, and the end face thermal resistance 2 is rotated to make the end portion abut against the outer pipe 1 of the denitration spray gun.
[0024] As Figures 3 to 6 shown, the cross section shape of the first fixing member 5 and the second fixing member 6 in the utility model is semicircular ring shape, and the inner diameter is equal to the outer diameter of the outer pipe 1 of the denitration spray gun, so that the first fixing member 5 and the second fixing member 6 can be attached with the outer pipe 1 of the denitration spray gun in use, and the effect of fixing the end face thermal resistance 2 is improved.
[0025] As Figure 7 and Figure 8 shown, the utility model is used in the circumferential direction on the cyclone barrel 11, and a plurality of denitration spray guns are uniformly arranged, one spray gun flow interruption detection device of the utility model is installed on each denitration spray gun, the utility model is provided with a multi-channel inspection instrument 4, and the control circuit inside the multi-channel inspection instrument 4 sequentially measures the input channels of each connected end face thermal resistance 2 according to a certain order and time interval, so that whether the plurality of denitration spray guns on the cyclone barrel 11 are blocked is detected.
[0026] The parts not particularly mentioned in the above description are all prior art or can be realized by prior art. Moreover, the specific implementation cases described in the present application are only the preferred implementation cases of the present application, and are not intended to limit the implementation scope of the present application. That is, equivalent changes and modifications made in accordance with the content of the patent application scope of the present application should be regarded as the technical scope of the present application.
Claims
1. A device for detecting the interruption of the flow of a spray gun, installed on the outer tube (1) of a denitration spray gun, characterized in that: The end face thermal resistance (2) and the thermal resistance fixing part (3) are included, the thermal resistance fixing part (3) is fixed on the outer pipe (1) of the denitration spray gun, the end face thermal resistance (2) passes through the thermal resistance fixing part (3) and is fixed with the thermal resistance fixing part (3), the end face of the end face thermal resistance (2) is in close contact with the outer pipe (1) of the denitration spray gun, for detecting the temperature of the outer pipe (1) of the denitration spray gun, the lead wire of the end face thermal resistance (2) is connected with the patrol instrument (4), in the state of the denitration spray gun being blocked, when the end face thermal resistance (2) detects that the temperature of the outer pipe (1) of the denitration spray gun rises to exceed the set range, the patrol instrument (4) triggers an alarm signal.
2. The detection device of a lance flow interruption according to claim 1, characterized in that The thermal resistance fixing part (3) includes the first fixing part (5) and the second fixing part (6), the first fixing part (5) and the second fixing part (6) are in close contact with the outer pipe (1) of the denitration spray gun from both sides of the outer pipe (1) of the denitration spray gun, and the first fixing part (5) and the second fixing part (6) are fixedly connected, and the end face thermal resistance (2) passes through the second fixing part (6) and is fixedly connected with the second fixing part (6).
3. A device for detecting lance flow interruption according to claim 2, characterized in that: A threaded hole (7) is formed on each side of the first fixing part (5), a stepped through hole (8) is formed on each side of the second fixing part (6), and the two stepped through holes (8) correspond to the two threaded holes (7) respectively, and the first fixing part (5) and the second fixing part (6) are detachably connected by the fastening screw (9) passing through the stepped through hole (8) and screwing with the threaded hole (7).
4. The detection device of a lance flow interruption according to claim 3, characterized in that A fixed through hole (10) is formed on the second fixing part (6) between the two stepped through holes (8), the fixed through hole (10) penetrates the two sides of the second fixing part (6), the end face thermal resistance (2) extends into the fixed through hole (10) and is screwed with the fixed through hole (10).
5. A device for detecting lance flow interruption according to claim 4, characterized in that: The two stepped through holes (8) are symmetrically distributed on the left and right sides of the fixed through hole (10).
6. A lance flow interruption detection device according to any one of claims 2 to 5, characterized in that: The cross-sectional shape of the first fixing part (5) and the second fixing part (6) is semicircular ring, and the inner diameter is equal to the outer diameter of the outer pipe (1) of the denitration spray gun.