CN212988032U - Gas open type drainage system - Google Patents
Gas open type drainage system Download PDFInfo
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- CN212988032U CN212988032U CN202020898014.0U CN202020898014U CN212988032U CN 212988032 U CN212988032 U CN 212988032U CN 202020898014 U CN202020898014 U CN 202020898014U CN 212988032 U CN212988032 U CN 212988032U
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Abstract
A gas open flow system comprising: drainage air flue, electrical control valve, energy-saving appliance and drainage fan that link to each other in proper order to and main exhaust air flue, wherein: one end of the drainage air passage is vertically arranged in the main exhaust air passage, and the other end of the drainage air passage is connected with the electric regulating valve; a drainage structure is arranged in the drainage air passage; a guide plate is arranged in the main exhaust air passage. The drainage structure is a semicircular pipe structure separated along the axial direction, and the projection form of the extending end of the drainage structure on the cross section of the main exhaust air passage is a combination of a rectangle or a semiellipse and a triangle. The guide plate is an oval half-plate structure forming an included angle with the main exhaust air passage. The utility model discloses an effect of whole original exhaust system's resistance that does not increase can guide the regulation of induced air quantity control valve through the judgement of two temperature measurement station difference in temperature sizes to combine actual parameter requirement, realize the maximize of flue gas waste heat recovery energy, can make the system obtain best induced air efficiency, thereby obtain better energy-conserving effect.
Description
Technical Field
The utility model relates to a technique in the field of waste heat recovery, in particular to an open gas drainage system.
Background
Some kilns (such as glass kilns) hearths are very sensitive to the change of the pressure in the kilns and the resistance change of an exhaust air passage when in operation, in the process of recovering the hot flue gas waste heat of the objects, the conventional method directly installs a valve on the air passage and then opens the bypass closed gas for drainage, the exhaust resistance is increased due to the additionally arranged air passage and heat exchange equipment, the exhaust resistance can be obviously fluctuated when the heat exchange system is in failure condition by emergency switching or an induced draft fan is loaded and unloaded, and the hidden danger of exhaust blockage caused by the failure of the channel valve can cause the obvious fluctuation of the pressure in the kilns, thereby causing the serious influence on the quality of products in the kil.
In other semi-open kilns and heating furnaces, in order to keep the reducing atmosphere of a hearth and a corresponding temperature environment, micro-positive pressure combustion is needed to realize, higher pressure control requirements are necessarily interfered by fluctuation of exhaust resistance, air leakage of furnace door sealing can be caused by overlarge or undersize exhaust resistance, sealing can be burnt in serious conditions, product quality is influenced, and the like, so that new requirements are provided for drainage of the type of waste heat flue gas, and other gas drainage processes have similar rules.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it is not enough to the above-mentioned that prior art exists, provide an open drainage system of gas, on keeping original exhaust passage basis, at first through opening bleed branch road pipeline to former exhaust passage side, form the drainage structure to the temperature measurement station is established to the equipment on original exhaust air flue upper reaches and drainage air flue, whether there is the size of former air flue export cold wind refluence and the volume of falling the flow in judging the drainage volume through the size of the two temperature difference, and guide drainage air flue electric regulating valve's aperture size.
The invention is realized by the following technical scheme:
the utility model discloses a: drainage air flue, electrical control valve, energy-saving appliance and drainage fan that link to each other in proper order to and main exhaust air flue, wherein: one end of the drainage air passage is vertically arranged in the main exhaust air passage, and the other end of the drainage air passage is connected with the electric regulating valve.
And a drainage structure is arranged in the drainage air passage.
The main exhaust air flue in be equipped with the guide plate, wherein: the guide plate is arranged at the upstream of the drainage structure.
The drainage structure is a semicircular pipe structure separated along the axial direction, and the projection form of the extending end of the drainage structure on the cross section of the main exhaust air passage is a combination of a rectangle or a semiellipse and a triangle.
The guide plate is an oval half-plate structure which forms an included angle with the main exhaust air passage.
The main exhaust air flue in be equipped with main air flue temperature measurement station, wherein: the main air passage temperature measuring point is arranged at the upstream of the drainage air passage.
The drainage air flue in be equipped with drainage air flue temperature measurement station, wherein: the drainage air flue temperature measuring point is arranged at the downstream of the drainage structure.
Technical effects
Compared with the prior art, the utility model discloses following technological effect has: 1. the effect that the resistance of the original exhaust system is not increased on the whole is realized; 2. when a fault or failure occurs, even if the control valve fails and does not act, the control valve can be smoothly and spontaneously switched to the original system state, the original system exhaust cannot be influenced, and the normal use of equipment is ensured; 3. the adjustment of an induced air quantity control valve can be guided through the judgment of the temperature difference of the two temperature measuring points, and the maximization of the flue gas waste heat recovery energy is realized by combining with the actual parameter requirement; 4. the design of the air inducing structure and the arrangement position is carried out according to the actual gas flow velocity and the pipeline structure, so that the system can obtain the optimal air inducing efficiency, and a better energy-saving effect is obtained.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view of the main air duct A-A of the present invention;
FIG. 3 is a cross-sectional view of the main air duct of the present invention taken along line B-B;
FIG. 4 is a schematic view of the drainage structure of the present invention;
in the figure: the device comprises a main exhaust air passage 1, a drainage structure 2, a drainage air passage 3, a drainage air passage temperature measuring point 4, an electric regulating valve 5, an energy saver 6, a drainage fan 7, a guide plate 8 and a main air passage temperature measuring point 9.
Detailed Description
As shown in fig. 1, the present embodiment relates to an open gas drainage system, which comprises: drainage air flue 3, electrical control valve 5, energy-saving appliance 6 and drainage fan 7 that link to each other in proper order to and main exhaust air flue 1, wherein: one end of the drainage air passage 3 is vertically arranged in the main exhaust air passage 1, and the other end is connected with the electric regulating valve 5.
And a drainage structure 2 is arranged in the drainage air passage 3.
A guide plate 8 is arranged in the main exhaust air passage 1.
The drainage structure 2 is a semicircular pipe structure separated along the axial direction, the projection form of the extending end of the drainage structure on the cross section of the main exhaust air passage 1 adopts the combination of other rectangles such as a rectangle, a semiellipse, a triangle and the like, but is not limited to the combination, and the specific view area ratio eta is determined.
The cross-sectional area ratio eta of the main air flow channel occupied by the drainage structure 2 is determined according to the pressure head allowance of a fan in an original exhaust system or the requirement of adding a corresponding pressure head by replacing a new fan, and the specific calculation formula is as follows:
wherein: delta P is the pressure head allowance of the system fan, Pa; rho is exhaust density, kg/m3；(ii) a Xi is a shape resistance coefficient, and the value range is 1-2; k is a safety margin coefficient and the value range is 1.1-1.3; v is the exhaust gas flow velocity before modification, m/s; eta is the ratio of the projection area of the flow guide structure 2 on the flow cross section of the air passage to the flow cross section of the air passage.
The installation angle of the drainage structure 2 is not more than 90 degrees, the smaller the included angle beta between the axial direction of the drainage structure and the axial direction of the main exhaust air flue 1 is, the smaller the flue resistance is, but the smaller the projection on the cross section of the original air flue is, and the drainage efficiency is weakened; the bigger the included angle is, the bigger the flue resistance is, the bigger the projection on the cross section of the original air flue is, and the drainage efficiency is enhanced.
According to the arrangement difficulty and the drainage effect of the induced air duct, when the beta value is 30-60 degrees, the resistance is small, and the drainage efficiency is high; when the beta value is 90 degrees, the installation and the manufacture are most convenient and the pipeline arrangement condition is better.
As shown in fig. 2 and 3, the guide plate 8 is an elliptic semi-plate structure forming an included angle with the main exhaust gas passage 1, and the included angle with the gas flow direction is 30-60 degrees; the center arrangement position L of the guide plate is 1D-3D on the upstream of the central point of the drainage structure 2, wherein D is the diameter of the air passage.
The main exhaust airway 1 is internally provided with a main airway temperature measuring point 9, wherein: the main air passage temperature measuring point 9 is arranged at the upstream of the drainage air passage 3.
The device guides the valve opening of the electric regulating valve 5 through the temperature difference delta T between the drainage air passage temperature measuring point 4 and the main air passage temperature measuring point 9, the temperature difference delta T is set in the PLC module, and the temperature difference delta T is within the temperature range [ T ]min，Tmax]As the basis for judging the normal operation condition, when the temperature difference is lower than the minimum value TminWhen the temperature difference is higher than the maximum value T, the regulating valve 5 is opened greatlymaxWhen the temperature difference is within the set range, the valve of the electric regulating valve 5 is closed;
the temperature difference delta T between the gas and the gas is reduced along with the gradual increase of the introduced gas quantity, the value of the delta T is close to the minimum value along with the further increase of the introduced gas quantity, the temperature difference delta T is gradually increased, and although the total gas quantity is larger at the moment, the energy grade of the hot gas is reduced, and the utilization efficiency is reduced on the contrary; according to the summary of operation experience, the heat recovery efficiency is higher when the temperature is in the range of 3-8 ℃.
Compare prior art, the increase of the original exhaust system resistance that drainage structure 2 and guide plate 8 in this device arouse through adjusting original draught fan baffle, increases the pressure head surplus in order to match the newly-increased resistance, can realize switching to original systematic "no disturbance" formula, reduces exhaust resistance to minimumly.
The starting drainage system is arranged and the flow control method is applied when the diameter of an original flue is 1.5m, the flow rate of original flue gas is about 10m/s and the temperature of original exhaust gas is 175 ℃, and when the temperature difference delta T is within the range of 5-8 ℃, the gas drainage efficiency is over 90 percent, so that the overall heat recovery efficiency of the system reaches a higher level.
The foregoing embodiments may be modified in various ways by those skilled in the art without departing from the spirit and scope of the present invention, which is not limited by the above embodiments but is to be accorded the full scope defined by the appended claims, and all such modifications and variations are within the scope of the invention.
Claims (5)
1. An open gas conduction system, comprising: drainage air flue, electrical control valve, energy-saving appliance and drainage fan that link to each other in proper order to and main exhaust air flue, wherein: one end of the drainage air passage is vertically arranged in the main exhaust air passage, the other end of the drainage air passage is provided with a drainage fan, the middle of the drainage air passage is provided with an electric regulating valve for controlling the drainage flow, the end of the drainage air passage extending into the side of the main exhaust air passage is internally provided with a drainage structure, and the main exhaust air passage is internally provided with a guide plate;
the guide plate is arranged in the main exhaust air passage and is positioned at the upstream of the drainage structure.
2. The open gas drainage system according to claim 1, wherein the drainage structure is a semicircular tube structure divided along the axial direction, and the projection form of the extending end of the drainage structure on the cross section of the main exhaust gas passage is (rectangular), (semi-elliptical) or (triangular).
3. The open gas drainage system of claim 1 wherein the baffle is an elliptical semi-plate structure angled with respect to the main exhaust gas path.
4. The open gas conduction system according to claim 1, wherein a main gas duct temperature measurement point is provided in the main exhaust gas duct, wherein: the main air passage temperature measuring point is arranged at the upstream of the drainage air passage.
5. The open gas drainage system of claim 1, wherein a drainage gas channel temperature measuring point is arranged in the drainage gas channel, and wherein: the drainage air flue temperature measuring point is arranged at the downstream of the drainage structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020898014.0U CN212988032U (en) | 2020-05-26 | 2020-05-26 | Gas open type drainage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020898014.0U CN212988032U (en) | 2020-05-26 | 2020-05-26 | Gas open type drainage system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212988032U true CN212988032U (en) | 2021-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020898014.0U Active CN212988032U (en) | 2020-05-26 | 2020-05-26 | Gas open type drainage system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212988032U (en) |
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2020
- 2020-05-26 CN CN202020898014.0U patent/CN212988032U/en active Active
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