Denitrification SCR (Selective Catalytic Reduction) digital intelligent control system

Abstract

The utility model provides a denitration SCR digital intelligent control system. The denitration SCR digital intelligent control system comprises a conveying pipe, a connecting pipe arranged on one side of the conveying pipe, a supporting pipe arranged on the top of the conveying pipe, a flow dividing pipe arranged at one end of the supporting pipe, a plurality of output pipes arranged on the top of the flow dividing pipe, and an input pipe fixedly installed on one side of the conveying pipe. According to the denitration SCR digital intelligent control system, pressure generated after ammonia enters an output pipe drives an impeller to be connected with a rotating rod to rotate towards one side, after a sealing sleeve rotates towards one side to a proper position, an air outlet hole in the sealing sleeve and an air outlet hole in the output pipe are overlapped, and the air outlet hole in the output pipe and the air outlet hole in the output pipe are communicated. When ammonia is sprayed out of the output pipe, ammonia is sprayed out upwards, so that the ammonia can be better neutralized with smoke in the smoke pipe, the denitration effect is improved, meanwhile, the sealing sleeve is automatically reset through a plurality of reset springs when ammonia is not sprayed out of the output pipe, and air outlet holes in the sealing sleeve and air outlet holes in the output pipe are staggered for sealing.

Description

Technical Field

[0001] The utility model relates to the field of SCR out-of-stock, in particular to an out-of-stock SCR digital intelligent control system. Background Art

[0002] SCR denitrification is also called selective catalytic reduction. Its principle is to use ammonia to reduce nitrate in flue gas to produce nitrogen and water. Therefore, the addition of ammonia is the key to the reaction of the low-temperature SCR denitrification reactor. The speed and quality of ammonia injection will determine the effect of reduction.

[0003] In the current SCR degassing system, ammonia is sprayed through an ammonia spraying grid. The current ammonia spraying grid can support the limit block through the setting of the supporting spring through the adjustable ammonia spraying grid after the ammonia spraying operation, so that the sealing sleeve is lowered into the air outlet pipe, and the air outlet groove on the sealing sleeve is sealed to prevent dust from adhering to the air outlet groove of the sealing sleeve and causing blockage of the air outlet groove of the sealing sleeve. However, the air outlet groove on the sealing sleeve is opened on both sides, so that when ammonia is sprayed, ammonia is sprayed to both sides, so that the sprayed ammonia cannot be well diffused in the smoke pipe, resulting in the neutralization effect of ammonia and smoke, and reducing the degassing effect.

[0004] Therefore, it is necessary to provide an out-of-stock SCR digital intelligent control system to solve the above technical problems. Utility Model Content

[0005] The utility model provides an out-of-stock SCR digital intelligent control system, which solves the problem that the gas outlet grooves on the existing sealing sleeve are opened on both sides, causing ammonia to be sprayed to both sides and preventing ammonia from being well diffused in the smoke pipe.

[0006] In order to solve the above technical problems, the utility model provides an out-of-stock SCR digital intelligent control system, comprising:

[0007] A delivery pipe, a connecting pipe is provided on one side of the delivery pipe, a supporting pipe is provided on the top of the delivery pipe, a shunt pipe is provided at one end of the supporting pipe, a plurality of output pipes are provided on the top of the shunt pipe, an input pipe is fixedly installed on one side of the delivery pipe, and a valve is provided on the surface of the input pipe;

[0008] The output pipe is rotatably connected to a rotating rod, one end of which is fixedly mounted with an impeller, an air outlet is provided inside the output pipe, and a sealing sleeve is provided on the surface of the output pipe;

[0009] A plurality of moving grooves are provided inside the output tube, and moving blocks are slidably connected inside the plurality of moving grooves, and a return spring is provided at one end of the plurality of moving blocks;

[0010] A plurality of card slots are provided inside the output tube, and card blocks are slidably connected inside the plurality of card slots.

[0011] Preferably, the plurality of return springs are respectively arranged at one end of the plurality of moving blocks, and are respectively arranged inside the plurality of moving grooves.

[0012] Preferably, the plurality of clamping blocks are grouped in pairs and are respectively fixedly connected to the top and bottom of the plurality of moving blocks, and are respectively slidably connected to the inside of the plurality of moving grooves.

[0013] Preferably, a positioning ring is fixedly connected to the surface of the support tube, a fixing sleeve is sleeved on the surface of the support tube, and an internal thread of the fixing sleeve is connected to a limiting sleeve.

[0014] Preferably, the limiting sleeve is a threaded sleeve, and a thread matching the limiting sleeve is provided inside the fixing sleeve.

[0015] Preferably, a fixing hole is provided inside the fixing sleeve, and a fixing pin is threadedly connected inside the fixing hole.

[0016] Preferably, a limiting groove is provided inside the fixing sleeve, and a limiting block is slidably connected inside the limiting groove.

[0017] Compared with the related art, the out-of-stock SCR digital intelligent control system provided by the utility model has the following beneficial effects:

[0018] The utility model provides a denitration SCR digital intelligent control system, which drives the impeller connected to the rotating rod to rotate to one side through the pressure generated after ammonia enters the interior of the output pipe, so that after the sealing sleeve is rotated to one side to a suitable position, the air outlet holes inside the sealing sleeve and the air outlet holes inside the output pipe overlap, and the ammonia is sprayed upward, so that it can be better neutralized with the smoke in the smoke pipe, thereby increasing the denitration effect. At the same time, through multiple reset springs, when the output pipe does not spray ammonia, the sealing sleeve is automatically reset, so that the air outlet holes inside the sealing sleeve and the air outlet holes inside the output pipe are staggered for sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic structural diagram of a first embodiment of an out-of-stock SCR digital intelligent control system provided by the utility model;

[0020] Figure 2 for Figure 1 The structural schematic diagram of the output tube shown;

[0021] Figure 3 for Figure 2 A schematic diagram of the structure of the air outlet shown;

[0022] Figure 4 for Figure 2 An enlarged schematic diagram of part A is shown;

[0023] Figure 5 A schematic structural diagram of a second embodiment of an out-of-stock SCR digital intelligent control system provided by the utility model;

[0024] Figure 6 for Figure 5 An enlarged schematic diagram of part B is shown;

[0025] Figure 7 for Figure 6 An enlarged schematic diagram of part C is shown.

[0026] Numbers in the figure: 1. delivery pipe, 2. connecting pipe, 3. support pipe, 4. diverter pipe, 6. output pipe, 7. rotating rod, 8. impeller, 9. air outlet, 10. sealing sleeve, 11. movable groove, 12. movable block, 13. reset spring, 14. slot, 15. block, 17. input pipe, 18. valve, 20. positioning ring, 21. fixing sleeve, 22. limiting sleeve, 23. fixing hole, 24. fixing pin, 25. limiting slot, 26. limiting block. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.

[0028] First embodiment

[0029] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 ,in, Figure 1 A schematic structural diagram of a first embodiment of an out-of-stock SCR digital intelligent control system provided by the utility model; Figure 2 for Figure 1 The structural schematic diagram of the output tube shown; Figure 3 for Figure 2 A schematic diagram of the structure of the air outlet shown; Figure 4 for Figure 2 An out-of-stock SCR digital intelligent control system includes:

[0030] A delivery pipe 1, a connecting pipe 2 is provided on one side of the delivery pipe 1, a supporting pipe 3 is provided on the top of the delivery pipe 1, a shunt pipe 4 is provided on one end of the supporting pipe 3, a plurality of output pipes 6 are provided on the top of the shunt pipe 4, an input pipe 17 is fixedly installed on one side of the delivery pipe 1, and a valve 18 is provided on the surface of the input pipe 17;

[0031] The output pipe 6 is rotatably connected to a rotating rod 7, one end of which is fixedly mounted with an impeller 8. An air outlet 9 is provided inside the output pipe 6, and a sealing sleeve 10 is provided on the surface of the output pipe 6.

[0032] A plurality of moving grooves 11 are provided inside the output pipe 6, and a moving block 12 is slidably connected inside each of the moving grooves 11, and a return spring 13 is provided at one end of each of the moving blocks 12;

[0033] A plurality of slots 14 are formed inside the output tube 6 , and a clamping block 15 is slidably connected inside each of the slots 14 .

[0034] The plurality of return springs 13 are respectively disposed at one end of the plurality of moving blocks 12 , and are respectively disposed inside the plurality of moving grooves 11 .

[0035] The plurality of clamping blocks 15 are grouped in pairs and are respectively fixedly connected to the top and bottom of the plurality of moving blocks 12 , and are respectively slidably connected to the inside of the plurality of moving grooves 11 .

[0036] The surface of the output pipe 6 and the inner wall of the sealing sleeve 10 are fixedly connected with stabilizing blocks, so that after the sealing sleeve 10 is rotated to one side until the two stabilizing blocks are in contact, the air outlet 9 inside the sealing sleeve 10 overlaps with the air outlet 9 inside the output pipe 6, and the sealing sleeve 10 can no longer rotate to one side.

[0037] The two delivery pipes 1 are connected by two connecting pipes 2. A plurality of support pipes 3 are fixedly installed on the top of the two delivery pipes 1. One ends of the plurality of support pipes 3 are respectively fixedly installed on the bottom of a plurality of branch pipes 4, and a plurality of delivery pipes 6 are fixedly installed on the surface of the plurality of branch pipes 4. After ammonia enters the interior of the delivery pipe 1 through the input pipe 17, it is transported into the interior of another delivery pipe 1 through the two connecting pipes 2, and then transported to the interior of the plurality of branch pipes 4 through the plurality of support pipes 3, and then sprayed out through the plurality of output pipes 6. The surfaces of the plurality of output pipes 6 are all provided with sealing sleeves 10.

[0038] An inlet pipe 17 is fixedly mounted on one side of a delivery pipe 1 .

[0039] A plurality of air outlet holes 9 are staggeredly formed inside the sealing sleeve 10 and the output pipe 6 .

[0040] The impeller 8 is used to spray ammonia outward from the inside of the output pipe 6, so that the pressure drives the impeller 8 connected to the rotating rod 7 to rotate to one side.

[0041] One end of the rotating rod 7 is fixedly connected to the surface of the inner wall of the sealing sleeve 10 , and one end of the sealing sleeve 10 is rotatably connected to the surface of the output pipe 6 through an oil seal.

[0042] A return spring 13 is disposed at one end of each of the plurality of moving blocks 12 and located inside each of the plurality of moving grooves 11 , and one side of each of the plurality of moving blocks 12 is fixedly connected to the surface of the inner wall of the sealing sleeve 10 .

[0043] The plurality of clamping slots 14 are respectively disposed at the top and bottom of the plurality of moving slots 11 , and the plurality of clamping blocks 15 are respectively slidably connected to the top and bottom of the plurality of moving blocks 15 .

[0044] SPSS principal component analysis

[0045] The principal component is a small number of comprehensive variables that are converted from multiple single variables with less information loss. Each of the components is obtained through a linear combination of the original variables, and there is no correlation between the principal components. Assume that the original variable matrix X is composed of p vectors, denoted as X = (X1, X2, ..., Xp), then the principal component matrix Y is composed of the following vectors, satisfying the following formula:

[0046] Y i =b i1 X1+b i2 X2+…+b ip X p

[0047] Through the linear transformation of this formula, it is found that the statistical characteristics of the principal components are not unique. Reasonable principal component extraction must meet three conditions: the sum of the squares of the coefficients corresponding to each principal component is one, different principal components are linearly independent, and the variance of the principal component extracted first is always larger than that of the principal component extracted later.

[0048] The extraction coefficient of the principal component cannot be obtained directly through SPSS, but the factor loading matrix based on principal component analysis can be obtained: ξ=(ξ i1 ,ξ i2 ,…ξ ip ), suppose q common factors are extracted, and the extracted factor model can be expressed as:

[0049] ZX i =ξ i1 f1+ξ i2 f2+…+ξ iq f q +ε i

[0050] The relationship between the factor loading coefficient and the principal component coefficient is: is the variance corresponding to the jth principal component.

[0051] The principal component can be expressed as:

[0052] Particle Swarm Optimization Algorithm PSO

[0053] Assume that the particle swarm Z is in the D-dimensional search space, expressed as , each particle is composed of a D-dimensional vector, and its speed and position are updated by the following formula.

[0054]

[0055] Where: V i is the velocity of the particle, Z i is the position of the th particle, P i is the individual extreme value of the population, P g is the global extreme value; k is the kth iteration, c1 and c2 are learning factors with non-negative constant values, which are considered to be cognitive and social parameters respectively, w reflects the degree to which the particle inherits the previous speed in terms of speed, that is, the inertia weight, and α is the constraint factor that limits the speed weight.

[0056] The fitness value of each particle's best historical position is compared with the fitness value of the global best position to determine the global optimal value until the conditions are met and the PSO operation is terminated.

[0057] Support Vector Machine (SVM)

[0058] According to the principle of structural risk minimization, the SVM transformation research process is to solve the optimization problem, and through the mutual conversion of dual problems, the final solution function is the maximization of the quadratic programming equation.

[0059]

[0060] The Lagrangian operator is used to solve the optimal classification hyperplane, and the decision function is shown as follows:

[0061]

[0062] Where x is the sample in the training set, or b * =-1-w0x i ,y i =-1.

[0063] Description of total quantity control strategy.

[0064] (1) The target controlled object is the environmental assessment indicator NOx concentration;

[0065] (2) The regulating means is the ammonia flow regulating valve on the original ammonia injection main pipe, which adjusts the total ammonia injection flow to ensure that the NOx concentration measured by the CEMS instrument does not exceed the standard;

[0066] (3) Based on the original single PID control loop, the predictive control algorithm was optimized and transformed. The main data were the boiler ULD instructions, the cold and hot primary air and coal volume of each mill, the economizer outlet O2, the instructions of each fan, and the NOx, O2, and flue gas volume at the inlet and outlet of the SCR area. The above data were used to predict and feedback control the overall operating conditions of the boiler and SCR area, minimize the volatility of the outlet NOx concentration, and ensure safe, stable and economical operation of the system.

[0067] On the one hand, the inlet NOx soft measurement technology is used to predict the inlet NOx, which is used as an important parameter for ammonia injection feedforward and participates in the closed-loop control of the total amount of ammonia injection, thus solving the problem of inlet NOx measurement lag. On the other hand, the transfer function of the SCR reactor under different loads is obtained through experiments, and then the advanced control algorithm model is implemented in a targeted manner on the National Instrument LabVIEW development software. The system gradually accumulates the data obtained from the test, automatically learns, and gradually achieves rapid judgment and adjustment when the burner combination and fuel change (it can timely discover problems such as blockage and wear failure of the SCR device according to the data change trend, and adjust the operation mode in time) and gradually reduce the frequency of real-time testing, and finally realize the intelligent and precise control of the SCR system.

[0068] Intelligent ammonia injection grid balanced denitrification control

[0069] The balanced control algorithm is used to optimize and online control the ammonia injection ratio of each partition, so as to achieve uniform spatial distribution of outlet NOx. The specific strategies are as follows:

[0070] (1) The manual ammonia injection grid at the original ammonia injection grid was automated, and the ammonia injection grid was divided into grids using flow field simulation technology. Each flue was divided into 6 grids, which were controlled by 6 newly modified automatic regulating valves and corresponded to the 6 newly added NOx partition measurement points at the SCR outlet;

[0071] (2) The main adjustment method of the zone valve is to adjust the distribution of the mixed reducing agent after the ammonia-air mixer, so that the relative relationship of the reducing agent concentration entering each area of ​​the ammonia injection grid changes, but the total ammonia injection amount is not adjusted. The total ammonia injection amount is adjusted by the flow control valve on the ammonia injection main pipe;

[0072] (3) The goal of zone regulation is to make the concentration of NOx at each zone measurement point at the SCR outlet tend to be consistent, that is, the leveling effect;

[0073] (4) During the commissioning phase, the corresponding relationship between valve position, flow rate and NOx concentration of each regulating valve will be determined through experiments, which will be used as a reference for setting valve adjustment parameters;

[0074] (5) When the zone control valve is automatically adjusted, the historical trend of the NOx concentration in each zone and its relative relationship are mainly used for adjustment. The control valve corresponding to the relatively high zone moves to a high valve position according to the algorithm, and the control valve corresponding to the relatively low zone moves to a low valve position according to the algorithm;

[0075] (6) When the zone control valve is adjusted, the main protection parameter is the dilution air flow rate of the SCR area. All zone control valves will maintain a certain opening to prevent the SCR area dilution air flow rate from being too low, resulting in an SCR exit event. At the same time, the local activity of the denitrification layer will be diagnosed in combination with the ammonia flow value of each zone and the corresponding outlet NOx measurement value, and when the local catalyst is deactivated, there will be no sharp excess of ammonia injection in the zone.

[0076] In addition, the zoned ammonia injection balance control algorithm will fully take into account factors such as the fact that each ammonia injection zone and the outlet NOx measurement zone cannot actually achieve 100% complete correspondence, and adjusting a single ammonia injection valve will also affect the ammonia injection amount in other pipelines.

[0077] The working principle of the out-of-stock SCR digital intelligent control system provided by the utility model is as follows:

[0078] During use, when ammonia enters the outlet pipe 6, it drives the impeller 8 connected to the rotating rod 7 to rotate to one side, thereby driving the sealing sleeve 10 connected to the multiple moving blocks 12 to move to one side in the multiple moving grooves 11 respectively, while squeezing the multiple return springs 13. When the multiple moving blocks 12 move to one side, they drive the multiple clamping blocks 15 to move to one side in the multiple clamping grooves 14 respectively.

[0079] When the sealing sleeve 10 is rotated to a suitable position to one side, the sealing sleeve 10 and the air outlet hole 9 inside the output pipe 6 overlap and ammonia is sprayed.

[0080] When the ammonia spraying stops, the multiple reset springs 13 push the multiple moving blocks 12 connected to the sealing sleeve 10 to rotate and reset to one side, so that the sealing sleeve 10 and the air outlet 9 inside the output pipe 6 are offset, and the air outlet 9 inside the output pipe 6 is sealed by the sealing sleeve 10.

[0081] Compared with the related art, the out-of-stock SCR digital intelligent control system provided by the utility model has the following beneficial effects:

[0082] The utility model provides a denitration SCR digital intelligent control system, in which the pressure generated by ammonia after entering the inside of the output pipe 6 drives the impeller 8 connected to the rotating rod 7 to rotate to one side, so that the sealing sleeve 10 is rotated to one side to a suitable position, and the air outlet 9 inside the sealing sleeve 10 overlaps with the air outlet 9 inside the output pipe 6, and the ammonia is sprayed upward, so that it can be better neutralized with the smoke in the smoke pipe, thereby increasing the denitration effect. At the same time, through multiple reset springs 13, when the output pipe 6 does not spray ammonia, the sealing sleeve 10 is automatically reset, so that the air outlet 9 inside the sealing sleeve 10 and the air outlet 9 inside the output pipe 6 are staggered for sealing.

[0083] Second embodiment

[0084] Please refer to Figure 5 , Figure 6 and Figure 7 Based on the out-of-stock SCR digital intelligent control system provided by the first embodiment of the present application, the second embodiment of the present application proposes another out-of-stock SCR digital intelligent control system. The second embodiment is only a preferred method of the first embodiment, and the implementation of the second embodiment will not affect the independent implementation of the first embodiment.

[0085] Specifically, the difference of the out-of-stock SCR digital control system provided by the second embodiment of the present application is that, in an out-of-stock SCR digital control system, a positioning ring 20 is fixedly connected to the surface of the support tube 3, a fixing sleeve 21 is sleeved on the surface of the support tube 3, and the internal thread of the fixing sleeve 21 is connected to a limiting sleeve 22.

[0086] The limiting sleeve 22 is a threaded sleeve, and a thread matching the limiting sleeve 22 is formed inside the fixing sleeve 21 .

[0087] A fixing hole 23 is formed inside the fixing sleeve 21 , and a fixing pin 24 is threadedly connected inside the fixing hole 23 .

[0088] A limiting groove 25 is formed inside the fixing sleeve 21 , and a limiting block 26 is slidably connected inside the limiting groove 25 .

[0089] The fixing pin 24 is a threaded rod, and the fixing hole 23 is adapted to the fixing pin 24 so as to move to one side inside the fixing hole 23 when the fixing pin 24 rotates to one side.

[0090] One end of the limit block 26 is rotatably connected to one end of the fixing pin 24 , so as to drive the limit block 26 to move to one side when the fixing pin 24 moves to one side.

[0091] The fixing pin 21 is rotated to one side, thereby moving to one side inside the fixing hole 23 and driving the limit block 26 to move to one side inside the limit groove 25. When the limit block 26 contacts the positioning ring 20, the fixing sleeve 21 cannot be rotated to one side, so that the fixing sleeve 21 will not rotate to one side and loosen due to vibration or the like when the output pipe 6 is spraying ammonia.

[0092] The working principle of the out-of-stock SCR digital intelligent control system provided by the utility model is as follows:

[0093] When in use, the two fixing sleeves 21 are rotated to one side so that they are moved upward and separated on the surfaces of the two limiting sleeves 22 respectively, and then the diverter pipe 4 is moved upward to drive the two supporting pipes 3 to be taken out from the inside of the two limiting sleeves 22 respectively, and the diverter pipe 4 can be removed.

[0094] Compared with the related art, the out-of-stock SCR digital intelligent control system provided by the utility model has the following beneficial effects:

[0095] The utility model provides an out-of-stock SCR digital intelligent control system and method, which comprises the following steps: after the fixing sleeve 21 is rotated to one side to a suitable position, the shunt pipe 4 is moved upward to drive the two support pipes 3 to be taken out from the inside of the two limit sleeves 22 respectively, thereby facilitating the disassembly of the shunt pipe 4 and cleaning or replacing the multiple output pipes 6 on the top of the shunt pipe 4.

[0096] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An out-of-stock SCR digital intelligent control system, characterized in that: include: A delivery pipe, a connecting pipe is provided on one side of the delivery pipe, a supporting pipe is provided on the top of the delivery pipe, a shunt pipe is provided at one end of the supporting pipe, a plurality of output pipes are provided on the top of the shunt pipe, an input pipe is fixedly installed on one side of the delivery pipe, and a valve is provided on the surface of the input pipe; The output pipe is rotatably connected to a rotating rod, one end of which is fixedly mounted with an impeller, an air outlet is provided inside the output pipe, and a sealing sleeve is provided on the surface of the output pipe; A plurality of moving grooves are provided inside the output tube, and moving blocks are slidably connected inside the plurality of moving grooves, and a return spring is provided at one end of the plurality of moving blocks; A plurality of card slots are provided inside the output tube, and card blocks are slidably connected inside the plurality of card slots.

2. The out-of-stock SCR digital intelligent control system according to claim 1 is characterized in that: The plurality of return springs are respectively arranged at one end of the plurality of moving blocks and are respectively arranged inside the plurality of moving grooves.

3. The out-of-stock SCR digital intelligent control system according to claim 1 is characterized in that: The plurality of clamping blocks are grouped in pairs and are respectively fixedly connected to the top and bottom of the plurality of moving blocks, and are respectively slidably connected to the inside of the plurality of moving grooves.

4. The out-of-stock SCR digital intelligent control system according to claim 1 is characterized in that: A positioning ring is fixedly connected to the surface of the support tube, a fixing sleeve is sleeved on the surface of the support tube, and an internal thread of the fixing sleeve is connected to a limiting sleeve.

5. The out-of-stock SCR digital intelligent control system according to claim 4 is characterized in that: The limiting sleeve is a threaded sleeve, and a thread matching the limiting sleeve is provided inside the fixing sleeve.

6. The out-of-stock SCR digital intelligent control system according to claim 5, characterized in that: A fixing hole is provided inside the fixing sleeve, and a fixing pin is threadedly connected inside the fixing hole.

7. The out-of-stock SCR digital intelligent control system according to claim 6, characterized in that: A limiting groove is provided inside the fixing sleeve, and the limiting block is slidably connected inside the limiting groove.

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