CN217179295U - Kiln steady voltage circulation system - Google Patents
Kiln steady voltage circulation system Download PDFInfo
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- CN217179295U CN217179295U CN202123296932.XU CN202123296932U CN217179295U CN 217179295 U CN217179295 U CN 217179295U CN 202123296932 U CN202123296932 U CN 202123296932U CN 217179295 U CN217179295 U CN 217179295U
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Abstract
The utility model discloses a kiln stable pressure circulating system, which comprises a kiln, a primary heat exchanger, a secondary heat exchanger and a draught fan which are connected in sequence; and a filter is connected between the first-stage heat exchanger and the second-stage heat exchanger, and the temperature value of the outlet of the first-stage heat exchanger is higher than the dew point of the tail gas, so that free water does not exist in the first-stage heat exchanger. The exit of kiln is equipped with first pressure sensor, the export and the kiln of draught fan pass through first tube coupling, and is equipped with the governing valve on the first pipeline, and when first pressure sensor's pressure was higher than appointed value an, the governing valve was closed, and when first pressure sensor's pressure was less than appointed value a, the governing valve was opened. The utility model discloses a tail gas after the first pipeline of backward flow will cool down returns to the kiln in, and the governing valve can be opened or close according to the stove pressure to keep the pressure of kiln, and can be used to adjust the stove pressure from the second grade heat exchanger combustion gas, also can recycle to other equipment in.
Description
Technical Field
The utility model relates to a kiln waste heat utilization technical field especially relates to a kiln steady voltage circulation system.
Background
In the production process of the new energy powder material, kiln sintering is an indispensable process link. The kiln sintering process needs to keep stable furnace pressure, the tail gas of the kiln is directly discharged into the atmosphere through a variable frequency induced draft fan at present, and the furnace pressure is stabilized by discharging a proper amount of tail gas through the variable frequency induced draft fan and manually adjusting the amount of sucked air. The tail gas inhales air in the exhaust process, the air is mixed with the kiln tail gas, and after the temperature is reduced to a certain temperature, the air is exhausted into the atmosphere through the induced draft fan, and the induced draft fan automatically adjusts the frequency according to the furnace pressure, so that the effect of stabilizing the pressure is achieved. As a plurality of materials need to be introduced with high-purity process gas in the sintering process, only a small amount of process gas participates in the reaction in the sintering process, the tail gas discharged by the kiln still contains the process gas with higher concentration, and the recycling of the kiln tail gas has great economic value. At present, a great deal of research on recycling of kiln tail gas is carried out, and the kiln tail gas needs to be recycled in a closed system and cannot be sucked into the outside. In the current research, how to stabilize the furnace pressure in a closed system is not proposed.
In addition, the tail gas discharged after the kiln is sintered contains alkaline granular dust capable of being dissolved in water and vapor generated during sintering besides the introduced process gas, so if a common heat exchanger is directly used for heat exchange, when the tail gas is cooled to a certain temperature, free water is separated out on the wall surface close to cooling water, alkaline substances are adhered to the wall surface of the heat exchange tube, and the low and blockage of the heat exchange efficiency can be caused after long-term use. Even more, corrosion of the heat exchange tubes may result, leading to the ingress of water into the exhaust gas. However, because the temperature of the kiln tail gas is high, a common filter element cannot resist the high temperature, so that the tail gas after sintering of the kiln cannot be recycled and applied and can only be discharged into the atmosphere, and a large amount of energy loss is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical blank of the prior furnace pressure stabilizing system, the utility model provides a furnace pressure stabilizing circulating system solves the problems.
The utility model provides a technical scheme that its technical problem adopted is: a kiln pressure stabilizing circulating system comprises a kiln, a primary heat exchanger, a secondary heat exchanger and an induced draft fan which are connected in sequence; and a filter is connected between the first-stage heat exchanger and the second-stage heat exchanger, and the temperature value of the outlet of the first-stage heat exchanger is higher than the dew point of the tail gas, so that free water does not exist in the first-stage heat exchanger.
The exit of kiln is equipped with first pressure sensor, the export and the kiln of draught fan pass through first tube coupling, and is equipped with the governing valve on the first pipeline, and when first pressure sensor's pressure was higher than appointed value an, the governing valve was closed, and when first pressure sensor's pressure was less than appointed value a, the governing valve was opened.
Further, be equipped with first ooff valve on the connecting pipeline of one-level heat exchanger and kiln, be equipped with the second ooff valve on the connecting pipeline of second grade heat exchanger and draught fan, one-level heat exchanger and second grade heat exchanger are all connected with the compressed air device through purging the pipe, work as when the compressed air device opens, first ooff valve and second ooff valve close.
Furthermore, dust collection boxes for containing dust are arranged in the primary heat exchanger and the secondary heat exchanger.
Furthermore, a second pressure sensor is arranged at an inlet of the secondary heat exchanger, a purging valve is arranged on the purging pipe, when the pressure difference between the second pressure sensor and the first pressure sensor is larger than a specified value, the purging valve is opened, and the first switch valve and the second switch valve are closed.
Further, the first pressure sensor and the regulating valve are electrically connected with the controller.
Further, the purging pipe is connected with one end of the first-stage heat exchanger and one end of the second-stage heat exchanger, the other ends of the first-stage heat exchanger and the second-stage heat exchanger are provided with drain outlets, and the ash collecting box is connected with the drain outlets through a gate valve.
Furthermore, an outlet of the first-stage heat exchanger is provided with a temperature sensor, a cold water regulating valve is arranged on a cold water channel of the first-stage heat exchanger, and the cold water regulating valve and the temperature sensor are both electrically connected with the controller, so that the opening degree of the cold water regulating valve is regulated according to the numerical value of the temperature sensor.
Further, the regulating valve may regulate the opening degree according to a value of the first pressure sensor.
The utility model has the advantages that:
(1) kiln steady voltage circulation system, tail gas after will cooling through the first pipeline of backward flow returns to the kiln in, the governing valve can be opened or close according to the furnace pressure, thereby keep the pressure of kiln, and, tail gas is through the preliminary cooling of one-level heat exchanger, guarantee not produce free water under the prerequisite of tail gas cooling, the dust can not be because of being dissolved in free water adhesion in the one-level heat exchanger, the rethread filter filters the dust, further cool down tail gas through the second grade heat exchanger at last, follow the gas of second grade heat exchanger and can be used to adjust the furnace pressure, also can regard as heat transfer heat source recycle to other equipment in.
(2) Kiln steady voltage circulation system, the aperture can be adjusted according to the stove pressure of setting for to the governing valve to keep the pressure of kiln in real time.
(3) Kiln steady voltage circulation system, can adjust the input of cold water according to the temperature sensor in one-level heat exchanger exit to accurate control one-level heat exchanger exit temperature guarantees that it is in more than the dew point of tail gas.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a front view of a specific embodiment of a kiln pressure stabilizing circulation system according to the present invention;
fig. 2 is a right side view of the primary or secondary heat exchanger of fig. 1.
In the figure, 1, a kiln, 2, a primary heat exchanger, 3, a secondary heat exchanger, 4, a draught fan, 5, a filter, 6, a regulating valve, 7, a first switch valve, 8, a second switch valve, 9, a purging pipe, 10, an ash collecting box, 11, a sewage draining outlet, 12, a gate valve, 13, a first pressure sensor, 14, a second pressure sensor, 15, a purging valve, 16, a temperature sensor, 17 and a cold water regulating valve.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
Example one
As shown in fig. 1 and 2, a kiln pressure stabilizing circulation system comprises a kiln 1, a primary heat exchanger 2, a secondary heat exchanger 3 and a draught fan 4 which are connected in sequence; be connected with filter 5 between one-level heat exchanger 2 and the second grade heat exchanger 3, the temperature value of the export of one-level heat exchanger 2 is higher than the dew point of tail gas, so that do not have free water in the one-level heat exchanger 2, tail gas temperature after the cooling of one-level heat exchanger 2 can not be too high, can get into filter 5, the dew point means that vapor content is unchangeable in gaseous, keep under the certain circumstances of atmospheric pressure, the temperature when making gas cooling reach the saturation, because the temperature in the export of one-level heat exchanger 2 is higher than the dew point of tail gas, consequently, free water can not exist, the powder can not be because of dissolving in free water and appearing, and the tail gas that gets into second grade heat exchanger 3 has been filtered by filter 5, consequently, all can not have the powder blocking phenomenon in one-level heat exchanger 2 and the second grade heat exchanger 3.
The outlet of the kiln 1 is provided with a first pressure sensor 13, the outlet of the induced draft fan 4 is connected with the kiln 1 through a first pipeline, the first pipeline is provided with a regulating valve 6, when the pressure of the first pressure sensor 13 is higher than a specified value a, the regulating valve 6 is closed, the first pipeline is not conducted, when the pressure of the first pressure sensor 13 is lower than the specified value a, the regulating valve 6 is opened, and the first pipeline is conducted. The utility model can realize the temperature of the furnace pressure only by controlling the opening or closing of the regulating valve 6 according to the furnace pressure without adjusting the frequency of the draught fan 4 under the same process, and the cooled tail gas can enter other devices to further purify the process gas and then return to the kiln for recycling; the recovered kiln tail gas waste heat can be used in other equipment, such as a dehumidification unit of a factory building.
The primary heat exchanger 2 and the secondary heat exchanger 3 usually adopt cold water as heat exchange media, and the temperature of tail gas discharged by the kiln 1 and the quantity of tail gas discharged in unit time are changed slightly in the sintering process of the same batch, so the heat exchange quantity in the primary heat exchanger 2 can also be assumed to be a stable value, and the temperature of the tail gas passing through the primary heat exchanger 2 can be kept above a dew point as long as the flow quantity of the cold water is initially adjusted to be proper.
In order to further precisely control the outlet temperature of the primary heat exchanger 2, preferably, a temperature sensor 16 is arranged at the outlet of the primary heat exchanger 2, a cold water regulating valve 17 is arranged on a cold water channel of the primary heat exchanger 2, and both the cold water regulating valve 17 and the temperature sensor 16 are electrically connected with the controller, so that the opening degree of the cold water regulating valve 17 is regulated according to the value of the temperature sensor 16. The temperature sensor 16 is a real-time temperature control type temperature sensor, the temperature value of the temperature sensor 16 is set as the dew point temperature of the exhaust gas, the opening degree of the cold water regulating valve 17 is controlled by the temperature sensor 16, and the cold water regulating valve 17 controls the input quantity of the cooling water. When the temperature of the temperature sensor 16 is higher than the set value, the opening degree of the cold water regulating valve 17 is slowly increased until the temperature of the temperature sensor 16 reaches the set value, and when the temperature of the temperature sensor 16 is lower than the set value, the opening degree of the cold water regulating valve 17 is decreased until the temperature of the temperature sensor 16 reaches the set value.
The first pressure sensor 13 and the regulating valve 6 are preferably electrically connected with the controller, so that real-time control can be realized, the precision is improved, and the labor force is saved. As shown in fig. 1, the first pressure sensor 13 is a pressure real-time control type pressure sensor, and the opening and closing of the regulating valve 16 can be controlled by a set pressure value. The regulating valve 6 may also be opened in accordance with the value of the first pressure sensor 13, and its regulating principle is the same as that of the cold water regulating valve 17.
Example two
The heat exchanger has certain solid residue after long-term use, and in order to ensure the efficient recovery of waste heat by the heat exchanger, the embodiment is improved as follows on the basis of the first embodiment: be equipped with first ooff valve 7 on the connecting pipeline of one-level heat exchanger 2 and kiln 1, be equipped with second ooff valve 8 on the connecting pipeline of second grade heat exchanger 3 and draught fan 4, one-level heat exchanger 2 and second grade heat exchanger 3 are all connected with the compressed air device through purging pipe 9, work as when the compressed air device is opened, first ooff valve 7 and second ooff valve 8 are closed, also when needing to wash one-level heat exchanger 2 and second grade heat exchanger 3, open the compressed air device to close first ooff valve 7 and second ooff valve 8, kiln 1 stops to carry tail gas to one-level heat exchanger 2, also avoids compressed air to flow backwards to kiln 1 and draught fan 4.
Preferably, a dust collection box 10 for containing dust is arranged in each of the primary heat exchanger 2 and the secondary heat exchanger 3.
As shown in figures 1 and 2, the purging pipe 9 is connected with one ends of the first-stage heat exchanger 2 and the second-stage heat exchanger 3, the other ends of the first-stage heat exchanger 2 and the second-stage heat exchanger 3 are both provided with a sewage outlet 11, and the ash collecting box 10 is connected with the sewage outlet 11 through a gate valve 12. In a normal state, the gate valve 12 is closed, when the first-stage heat exchanger 2 and the second-stage heat exchanger 3 need to be cleaned, the gate valve 12 is opened, and impurities can be swept into the ash collection box 10.
EXAMPLE III
On the basis of the second embodiment, a second pressure sensor 14 is arranged at an inlet of the second-stage heat exchanger 3, a purge valve 15 is arranged on the purge pipe 9, when the pressure difference between the second pressure sensor 14 and the first pressure sensor 13 is larger than a specified value, it indicates that a blockage phenomenon exists in the first-stage heat exchanger 2 or the second-stage heat exchanger 3, at this time, the purge valve 15 is opened, and the first switch valve 7 and the second switch valve 8 are closed. The purging time is controlled by monitoring the pressure of the first pressure sensor 13 and the pressure of the second pressure sensor 14, the blockage of the first-stage heat exchanger 2 and the second-stage heat exchanger 3 can be effectively avoided, the second pressure sensor 14 can adopt a pressure real-time alarm type pressure sensor, the pressure real-time alarm type pressure sensor is mainly used for alarming when the pressure is too high, the first switch valve 7 and the second switch valve 8 can be closed after the alarm, and the purging operation is carried out.
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In this specification, the schematic representations of the terms are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the description, and must be determined according to the scope of the claims.
Claims (8)
1. A kiln steady voltage circulation system which is characterized in that: comprises a kiln (1), a primary heat exchanger (2), a secondary heat exchanger (3) and a draught fan (4) which are connected in sequence; a filter (5) is connected between the primary heat exchanger (2) and the secondary heat exchanger (3), and the temperature value of the outlet of the primary heat exchanger (2) is higher than the dew point of the tail gas, so that free water does not exist in the primary heat exchanger (2);
the exit of kiln (1) is equipped with first pressure sensor (13), the export of draught fan (4) and kiln (1) are through first tube coupling, and are equipped with governing valve (6) on the first pipeline, and when the pressure of first pressure sensor (13) is higher than appointed value an, governing valve (6) are closed, and when the pressure of first pressure sensor (13) is less than appointed value a, governing valve (6) are opened.
2. The kiln pressure stabilizing circulation system of claim 1, wherein: be equipped with first ooff valve (7) on the connecting pipeline of one-level heat exchanger (2) and kiln (1), be equipped with second ooff valve (8) on the connecting pipeline of second grade heat exchanger (3) and draught fan (4), one-level heat exchanger (2) and second grade heat exchanger (3) are all connected with the compressed air device through purging pipe (9), work as when the compressed air device opens, first ooff valve (7) and second ooff valve (8) are closed.
3. The kiln pressure stabilizing circulation system of claim 2, wherein: dust collection boxes (10) for containing dust are arranged in the primary heat exchanger (2) and the secondary heat exchanger (3).
4. The kiln pressure stabilizing circulation system of claim 2, wherein: and a second pressure sensor (14) is arranged at an inlet of the secondary heat exchanger (3), a purging valve (15) is arranged on the purging pipe (9), when the pressure difference between the second pressure sensor (14) and the first pressure sensor (13) is greater than a specified value, the purging valve (15) is opened, and the first switch valve (7) and the second switch valve (8) are closed.
5. The kiln pressure stabilizing circulation system of claim 1, wherein: the first pressure sensor (13) and the regulating valve (6) are electrically connected with the controller.
6. The kiln steady pressure circulation system of claim 3, characterized in that: the blowing pipe (9) is connected with one end of the first-stage heat exchanger (2) and one end of the second-stage heat exchanger (3), the other ends of the first-stage heat exchanger (2) and the second-stage heat exchanger (3) are respectively provided with a sewage outlet (11), and the ash collection box (10) is connected with the sewage outlet (11) through a gate valve (12).
7. The kiln pressure stabilizing circulation system of claim 1, wherein: the outlet of the first-stage heat exchanger (2) is provided with a temperature sensor (16), a cold water regulating valve (17) is arranged on a cold water channel of the first-stage heat exchanger (2), and the cold water regulating valve (17) and the temperature sensor (16) are both electrically connected with the controller, so that the opening degree of the cold water regulating valve (17) is adjusted according to the numerical value of the temperature sensor (16).
8. The kiln pressure stabilizing circulation system of claim 5, wherein: the regulating valve (6) can regulate the opening degree according to the value of the first pressure sensor (13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123296932.XU CN217179295U (en) | 2021-12-24 | 2021-12-24 | Kiln steady voltage circulation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123296932.XU CN217179295U (en) | 2021-12-24 | 2021-12-24 | Kiln steady voltage circulation system |
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| CN217179295U true CN217179295U (en) | 2022-08-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625132A (en) * | 2023-07-24 | 2023-08-22 | 常州百利锂电智慧工厂有限公司 | Ternary lithium battery kiln tail gas recycling system and method |
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2021
- 2021-12-24 CN CN202123296932.XU patent/CN217179295U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116625132A (en) * | 2023-07-24 | 2023-08-22 | 常州百利锂电智慧工厂有限公司 | Ternary lithium battery kiln tail gas recycling system and method |
| CN116625132B (en) * | 2023-07-24 | 2023-10-27 | 常州百利锂电智慧工厂有限公司 | Ternary lithium battery kiln tail gas recycling system and method |
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