CN112178914A - Control method of direct-fired hot air system for spray drying tower - Google Patents
Control method of direct-fired hot air system for spray drying tower Download PDFInfo
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- CN112178914A CN112178914A CN202011072136.5A CN202011072136A CN112178914A CN 112178914 A CN112178914 A CN 112178914A CN 202011072136 A CN202011072136 A CN 202011072136A CN 112178914 A CN112178914 A CN 112178914A
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- Prior art keywords
- direct
- hot air
- air system
- fired hot
- executing
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H3/00—Air heaters
- F24H3/02—Air heaters with forced circulation
- F24H3/025—Air heaters with forced circulation using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/18—Arrangement or mounting of grates or heating means
- F24H9/1854—Arrangement or mounting of grates or heating means for air heaters
- F24H9/1877—Arrangement or mounting of combustion heating means, e.g. grates or burners
- F24H9/1881—Arrangement or mounting of combustion heating means, e.g. grates or burners using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2064—Arrangement or mounting of control or safety devices for air heaters
- F24H9/2085—Arrangement or mounting of control or safety devices for air heaters using fluid fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
Abstract
Disclosed is a control method of a direct-fired hot air system for a spray drying tower, comprising: s1, detecting the air pressure and/or temperature of the fuel gas, receiving an abnormal detection signal of equipment interlocked with the direct-fired hot air system, and executing S2 if the detection result is normal; s2, if the system selection switch is started, executing S31-S33; s31, starting a fan of the system; s32, moving an actuator of the system to a pre-ignition position; s33, detecting the pressure of combustion-supporting air, and if the pressure of the combustion-supporting air is qualified, executing S34-S36; s34, starting pre-purging in the system, performing a tightness test, and executing S35 if the tightness test is qualified; s35, moving the actuator to an ignition position, and starting pre-ignition; s36, confirming whether an ignition valve and a main valve of the system are opened or not, and if both are opened, executing S4; and S4, operating the direct-fired hot air system. The invention can ensure the operation safety of the direct-fired hot air system and is beneficial to visually indicating the position of the possible fault when the system cannot operate smoothly.
Description
Technical Field
The invention relates to the field of direct-fired hot air systems, in particular to a control method of a direct-fired hot air system for a spray drying tower.
Background
The spray drying tower is characterized in that air is filtered and heated by a burner, the air enters an air distributor at the top of the dryer, the hot air uniformly enters a drying chamber, feed liquid is sprayed into ultrafine atomized liquid beads by a high-speed centrifugal atomizer or a high-pressure atomizer at the top of a tower body, and the ultrafine atomized liquid beads are contacted with the air and can be dried into finished products within a very short time. The direct hot air drying of vegetable fat powder or milk powder such as coffee can only dry its surface, and the powder is easy to agglomerate, and spray drying is a systematic technology applied to material drying method.
The hot air used by the spray drying tower can be prepared by exchanging heat between cold air and steam through a plate heat exchanger and the like, but due to various defects, a burner is gradually used for replacing the heat exchanger, the burner is a device which enables fuel and air to be sprayed and mixed for combustion in a certain mode, dust is avoided, the heat energy utilization rate is high, and the ultrahigh-temperature and rapid heating of materials can be realized.
The combustor is the part among the hot-blast system of burning, and the hot-blast system of burning divide into direct combustion hot-blast system and indirect combustion hot-blast system, and relatively speaking, direct combustion hot-blast system efficiency is higher, but danger is also higher, and its operating condition if control is improper, causes the incident easily, consequently needs more reliable control, lacks the direct combustion hot-blast system operation control system of a set of system among the prior art.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a control method of a direct-fired hot air system for a spray drying tower, which has the following specific technical scheme:
discloses a control method of a direct-fired hot air system for a spray drying tower, which comprises the following steps:
s1, detecting the air pressure and/or temperature of the fuel gas in the fuel gas pipeline, receiving an abnormal detection signal of equipment interlocked with the direct-fired hot air system, and executing S2 if the detection result is normal;
s2, if the direct-fired hot air system selection switch is started, executing S31-S33;
s31, starting a fan of the direct-fired hot air system;
s32, moving an actuator of the direct-fired hot air system to a pre-ignition position;
s33, detecting the pressure of combustion-supporting air, and if the pressure of the combustion-supporting air is qualified, executing S34-S36;
s34, starting pre-purging in the direct-fired hot air system, performing a tightness test, and executing S35 if the tightness test is qualified;
s35, moving an actuator of the direct-fired hot air system to an ignition position, and starting pre-ignition;
s36, confirming whether an ignition valve and a main valve of the direct-fired hot air system are opened or not, and if both are opened, executing S4;
and S4, operating the direct-fired hot air system.
Further, in step S33, if the combustion air pressure is not qualified, the combustion hot air system is locked, and a first signal indicating that the fan state is to be detected is returned.
Further, in step S34, if the tightness test is not qualified, the direct combustion hot air system is locked, and a second signal indicating that the valve leakage state is suspected is returned.
Further, in step S36, if the ignition valve is not opened, the direct-combustion hot air system is locked, and a third signal indicating that the flame is suspected at the ignition valve is returned.
Further, if the main valve is not opened, the direct-combustion hot air system is locked, and meanwhile, a fourth signal for indicating that the flame at the main valve is detected is returned.
Further, after the direct-fired hot air system is locked, the direct-fired hot air system is reset, and the execution returns to S31-S33.
Further, in step S2, if the direct-fired hot air system selection switch is not activated, the linkage condition of the direct-fired hot air system is checked, if the linkage check result is qualified, S31-S33 is executed, otherwise, the execution returns to S1.
Further, gas pressure detection is carried out on gas in the gas pipeline, and if the gas pressure detection value is between a preset low-pressure limit value and a preset high-pressure limit value, a gas pressure detection result is normal.
Further, the temperature of the fuel gas in the fuel gas pipeline is detected, and if the temperature detection value is lower than a preset high-temperature limit value, the temperature detection result is normal.
Further, the equipment interlocked with the direct-fired hot air system comprises a spray drying system, a safety system and/or a whole plant safety supervision system.
The technical scheme of the invention has the beneficial effects that:
(a) establishing a control logic for the operation of the direct-fired hot air system, and strictly controlling the operation conditions of the direct-fired hot air system to ensure the operation safety of the direct-fired hot air system;
(b) when the direct-fired hot air system cannot smoothly operate, the position where the fault possibly occurs is visually indicated, so that the fault can be timely eliminated, and the overhauling efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for controlling a direct-fired hot air system for a spray drying tower according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood and more clearly understood by those skilled in the art, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of a portion of the invention and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this invention, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In one embodiment of the present invention, there is provided a control method of a direct-fired hot air system for a spray drying tower, referring to fig. 1, the control method comprising the steps of:
and S1, detecting the air pressure and/or temperature of the fuel gas in the fuel gas pipeline, receiving an abnormal detection signal of equipment interlocked with the direct-fired hot air system, and executing S2 if the detection result is normal.
Specifically, gas pressure detection is performed on gas in the gas pipeline, and if the gas pressure detection value is between a preset low-pressure limit value and a preset high-pressure limit value, the gas pressure detection result is normal.
And detecting the temperature of the fuel gas in the fuel gas pipeline, wherein if the temperature detection value is lower than a preset high-temperature limit value, the temperature detection result is normal.
Further, the equipment interlocked with the direct-fired hot air system comprises a spray drying system, a safety system and/or a whole plant safety supervision system, wherein if the spray drying system outputs abnormal signals of negative pressure, temperature, fans and the like in the tower, or the explosion venting system, the explosion suppression system and the explosion suppression system of the safety system output abnormal signals, or the fire fighting system of the whole plant safety supervision system outputs abnormal signals or emergency button actions thereof, the abnormal signals are used as abnormal detection signals of the equipment interlocked with the direct-fired hot air system.
No matter the air pressure detection result is abnormal, or the temperature detection result is abnormal, or the equipment interlocked with the direct-fired hot air system sends an abnormal detection signal, the direct-fired hot air system cannot smoothly operate, and S2 is continuously executed only under the conditions that the air pressure detection result is normal, the temperature detection result is normal, and the equipment interlocked with the direct-fired hot air system is not abnormal.
S2, if the direct-fired hot air system selection switch is started, executing S31-S33; if the direct-fired hot air system selection switch is not started, checking the linkage condition of the direct-fired hot air system, if the linkage checking result is qualified, executing S31-S33, otherwise, returning to execute S1.
S31, starting a fan of the direct-fired hot air system;
s32, moving an actuator of the direct-fired hot air system to a pre-ignition position;
s33, detecting the pressure of combustion-supporting air, and if the pressure of the combustion-supporting air is qualified, executing S34-S36; if the combustion-supporting air pressure is unqualified, locking a combustion-supporting hot air system, and simultaneously returning a first signal for indicating the fan state to be detected; and after the direct-fired hot air system is locked, resetting the direct-fired hot air system and returning to execute S31-S33.
Specifically, the direct-fired hot air system is locked, that is, in a current locked state, no component of the direct-fired hot air system can perform an action, including a fan, an actuator, a blower, an ignition valve, a main valve, and the like. And if and only if the direct-combustion hot air system is reset, the direct-combustion hot air system can be unlocked.
S34, starting pre-purging in the direct-fired hot air system, performing a tightness test, and executing S35 if the tightness test is qualified; if the tightness test is unqualified, locking the direct-combustion hot air system, and simultaneously returning a second signal for indicating the valve leakage state to be detected; and after the direct-fired hot air system is locked, resetting the direct-fired hot air system and returning to execute S31-S33.
S35, moving an actuator of the direct-fired hot air system to an ignition position, and starting pre-ignition;
s36, confirming whether an ignition valve and a main valve of the direct-fired hot air system are opened or not, and if both are opened, executing S4; if the ignition valve is not opened, locking the direct-combustion hot air system, simultaneously returning a third signal for indicating that the flame at the ignition valve is to be detected, resetting the direct-combustion hot air system after locking the direct-combustion hot air system, and returning to execute S31-S33; and if the main valve is not opened, locking the direct-fired hot air system, simultaneously returning a fourth signal for indicating that the flame at the main valve is to be detected, resetting the direct-fired hot air system after locking the direct-fired hot air system, and returning to execute S31-S33.
And S4, operating the direct-fired hot air system.
When the direct-fired hot air system receives the indication signal of the first signal in the operation control process, relevant workers should check the state of the fan; when receiving the indication signal of the second signal, the related staff should check the valve leakage state; when receiving the indication signal of the third signal, the relevant staff should check the flame status at the ignition valve; when receiving the indication signal of said fourth signal, the relevant staff should check the flame condition at the main valve. Therefore, the position of the fault which possibly occurs is visually indicated, the fault can be timely eliminated, and the maintenance efficiency is improved.
The invention can ensure the operation safety of the direct-fired hot air system and is beneficial to visually indicating the position of the fault when the direct-fired hot air system cannot operate smoothly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A control method of a direct-fired hot air system for a spray drying tower is characterized by comprising the following steps:
s1, detecting the air pressure and/or temperature of the fuel gas in the fuel gas pipeline, receiving an abnormal detection signal of equipment interlocked with the direct-fired hot air system, and executing S2 if the detection result is normal;
s2, if the direct-fired hot air system selection switch is started, executing S31-S33;
s31, starting a fan of the direct-fired hot air system;
s32, moving an actuator of the direct-fired hot air system to a pre-ignition position;
s33, detecting the pressure of combustion-supporting air, and if the pressure of the combustion-supporting air is qualified, executing S34-S36;
s34, starting pre-purging in the direct-fired hot air system, performing a tightness test, and executing S35 if the tightness test is qualified;
s35, moving an actuator of the direct-fired hot air system to an ignition position, and starting pre-ignition;
s36, confirming whether an ignition valve and a main valve of the direct-fired hot air system are opened or not, and if both are opened, executing S4;
and S4, operating the direct-fired hot air system.
2. The method for controlling a direct-fired hot air system for a spray drying tower according to claim 1, wherein in step S33, if the combustion air pressure is not qualified, the direct-fired hot air system is locked, and a first signal indicating that the fan status is to be checked is returned.
3. The method for controlling a direct-fired hot air system for a spray drying tower according to claim 1, wherein in the step S34, if the tightness test is not acceptable, the direct-fired hot air system is locked, and a second signal indicating that a valve leakage state is suspected is returned.
4. The method as claimed in claim 1, wherein in step S36, if the ignition valve is not opened, the direct-fired hot air system is locked, and a third signal indicating that the flame is detected at the ignition valve is returned.
5. The method as claimed in claim 1, wherein the step S36 is performed by locking the direct-fired hot air system if the main valve is not opened, and returning a fourth signal indicating that the flame is detected at the main valve.
6. The method for controlling a direct hot air system for a spray drying tower according to any one of claims 2 to 5, wherein after the direct hot air system is locked, the direct hot air system is reset and the method returns to perform S31 to S33.
7. The method as claimed in claim 1, wherein in step S2, if the direct hot air system selection switch is not activated, the linkage of the direct hot air system is checked, and if the linkage check result is qualified, the steps S31-S33 are executed, otherwise, the step S1 is returned to.
8. The method of claim 1, wherein a gas pressure is detected in the gas pipe, and if the detected gas pressure is between a predetermined low pressure limit and a predetermined high pressure limit, the gas pressure detection result is normal.
9. The method of controlling a direct-fired hot air system for a spray drying tower according to claim 1, wherein the temperature of the fuel gas in the fuel gas pipe is detected, and if the detected temperature value is lower than a preset high temperature limit value, the temperature detection result is normal.
10. The method for controlling the direct-fired hot air system for the spray drying tower according to claim 1, wherein the equipment interlocked with the direct-fired hot air system comprises a spray drying system, a safety system and/or a plant safety supervision system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011072136.5A CN112178914A (en) | 2020-10-09 | 2020-10-09 | Control method of direct-fired hot air system for spray drying tower |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011072136.5A CN112178914A (en) | 2020-10-09 | 2020-10-09 | Control method of direct-fired hot air system for spray drying tower |
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| CN112178914A true CN112178914A (en) | 2021-01-05 |
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| CN202011072136.5A Pending CN112178914A (en) | 2020-10-09 | 2020-10-09 | Control method of direct-fired hot air system for spray drying tower |
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2020
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102735068A (en) * | 2011-04-05 | 2012-10-17 | 易普森国际有限公司 | Method and industrial furnace for using a residual protective gas as a heating gas |
| CN202447038U (en) * | 2011-12-30 | 2012-09-26 | 南阳金牛电气有限公司 | Gas heating device for spray granulator |
| CN202470057U (en) * | 2012-02-08 | 2012-10-03 | 王爱洁 | Low-heat-value gas fuel combustion device |
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