A safety interlock control setting for each equipment in an industrial hot air drying system

Abstract

The present application relates to a safety interlock control arrangement for each device of an industrial hot air drying system, including: a drying tower, wherein the upper feed port of the drying tower is connected to a feed pipeline, and the upper air inlet of the drying tower is connected to a hot air furnace through an air supply pipe; a concentrated material pump, wherein the concentrated material pump is arranged on the feed pipeline; and a steam heat exchanger, wherein the steam heat exchanger is connected to the hot air furnace through an air outlet pipe. The equipment provided in the embodiment of the present application, since the drying tower, the hot air furnace, the instrument air, and the steam pipeline are respectively provided with pressure measuring equipment, and are respectively connected to a DCS control system, the operating conditions and parameters of the core equipment and key process media in the industrial hot air drying system can be realized through the DCS control system, which is closely linked to the safe operation of the hot air drying system, and on the basis of ensuring the safety of each device in the whole system, the system can also be quickly restored to service, and the correlation between the dynamic and static equipment of the overall structure is relatively strong, especially under emergency conditions, and the required processing timeliness is strong.

Description

Technical Field

[0001] The present application relates to the technical field of industrial hot air drying systems, and in particular to a safety interlock control arrangement for various equipment in an industrial hot air drying system. Background Art

[0002] At present, industrial exhaust gas is usually recycled in the form of combustion heating or power generation, which will emit a large amount of pollutants such as CO 2 、SO 2 And dust, etc. Using industrial tail gas as raw material to directly convert it into liquid ethanol and bacterial protein can effectively reduce the CO caused by combustion. 2 、SO 2 and particulate matter emissions, which plays a positive role in controlling haze weather and protecting the environment.

[0003] Gas fermentation to ethanol is a new technology that uses carbon monoxide as a carbon source to produce ethanol through bacterial bio-fermentation. After the fermented mash is distilled to extract ethanol, a certain amount of bacterial protein is contained in the mash. The bacterial protein has a single component and a high crude protein content. It is a high-value-added protein feed that can partially replace fish meal in the feed industry and is widely used in aquaculture and livestock and poultry farming. Reducing the dependence of high-protein feed on marine fish has considerable environmental and economic significance.

[0004] Bacteria extraction is mainly carried out through the process of centrifugal concentration-drying-packaging. The whole process mainly uses hot air drying and wind transportation to complete the extraction. Since the hot air drying system is the core of the production device, it determines the product quality of the protein product. At the same time, the system contains multiple fans, pumps and other dynamic equipment and drying towers, hot air furnaces and other static equipment. And the dynamic and static equipment are highly correlated, especially in emergency conditions, the processing timeliness is required, so a set of instrument interlocking control settings to ensure the safe operation of the device is required for the drying system. Summary of the invention

[0005] The present application provides a safety interlock control setting for each device of an industrial hot air drying system to solve the problem that bacterial extraction is mainly carried out through a process such as centrifugal concentration-drying-packaging, and the correlation between the dynamic and static equipment of the ordinary overall structure is not strong, especially in emergency conditions, and the processing timeliness cannot meet the requirements.

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a safety interlock control setting for each device of an industrial hot air drying system, including:

[0007] A drying tower, wherein the upper feed inlet of the drying tower is connected to a feed pipeline, and the upper air inlet of the drying tower is connected to a hot air furnace through an air supply pipe;

[0008] A concentrated material pump, the concentrated material pump being arranged on the material supply pipeline;

[0009] A steam heat exchanger is connected to the hot air furnace through an air outlet pipe.

[0010] Optionally, the hot blast furnace is arranged on a gas pipeline, and a burner is provided on the gas pipeline, and the burner is connected to the hot blast furnace.

[0011] Optionally, a combustion-supporting blower is provided on the air inlet pipeline of the hot blast furnace, and the combustion-supporting blower draws external air.

[0012] Optionally, the steam heat exchanger is arranged on the hot air inlet pipeline of the drying tower, and a blower is arranged to be connected to the steam heat exchanger.

[0013] Optionally, the air inlet of the steam heat exchanger is connected to a steam regulating valve via a steam pipeline, and the air inlet of the steam regulating valve is also connected to an air pipeline, and the steam pipeline and the air pipeline are respectively connected to an instrument air pressure gauge and a steam pressure gauge.

[0014] Optionally, a dust removal device is provided on the air outlet pipeline at the lower end of the drying tower, and the air outlet of the dust removal device is connected to the induced draft fan through a pipeline.

[0015] Optionally, the induced draft fan outlet pipeline is connected to a deodorizing device, and the induced draft fan is connected to a DCS control system via a wire.

[0016] Optionally, the DCS control system is also connected to the blower, the burner and the concentrated feed pump via wires.

[0017] Optionally, a drying tower pressure gauge is provided on the right side of the drying tower, and a hot blast furnace pressure gauge is provided on the upper side of the hot blast furnace.

[0018] Optionally, a smoke exhaust fan is provided on the hot blast furnace smoke exhaust pipeline.

[0019] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0020] The equipment provided in the embodiment of the present application is provided with pressure measuring equipment for the drying tower, hot air furnace, instrument air, and steam pipelines, and connected to the DCS control system respectively. Thus, the operating conditions and parameters of the core equipment and key process media in the industrial hot air drying system can be realized through the DCS control system, which is closely linked to the safe operation of the hot air drying system. On the basis of ensuring the safety of all equipment in the whole system, the system can also be quickly restored to service. On the contrary, when the steam, instrument air, drying tower, and hot air furnace trigger the safety interlock, the relevant equipment and valves are closed or stopped to ensure the safety of the equipment and personnel, and the overall structure has a strong correlation between the dynamic and static equipment, especially in emergency conditions, and the required processing timeliness is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0023] Figure 1 This is a schematic diagram of the process structure of the safety interlock control setting of various equipment in an industrial hot air drying system according to an embodiment of the present application.

[0024] Figure 2 An industrial hot air drying system DCS control system according to an embodiment of the present application sets relevant safety interlock control parameters and control logic for each control device.

[0025] Reference numerals:

[0026] 1. Instrument air pressure gauge; 2. Steam pressure gauge; 3. Steam control valve; 4. Blower; 5. Steam heater; 6. Combustion-supporting fan; 7. Burner; 8. Hot air furnace; 9. Hot air furnace pressure gauge; 10. Smoke exhaust fan; 11. Drying tower pressure gauge; 12. Drying tower; 13. Dust removal device; 14. DCS control system; 15. Deodorization device; 16. Draft fan; 17. Concentrated material pump. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Various embodiments of the present application may exist in the form of a range. It should be understood that the description in the form of a range is only for convenience and simplicity and should not be understood as a hard limit to the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which are applicable regardless of the range. In addition, whenever a numerical range is indicated in the present application, it is meant to include any quoted numbers (fractions or integers) within the indicated range. Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application, etc., can be purchased from the market or can be prepared by existing methods.

[0029] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the present application, the terms "include", "comprise", etc. refer to "including but not limited to". In the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In the present application, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular items or plural items. For example, "at least one of a, b, or c" or "at least one of a, b and c" can both mean: a, b, c, ab, i.e. a and b, ac, bc or abc, where a, b, c can be single or plural, respectively.

[0030] like Figure 1-2 As shown, the embodiment of the present application provides a safety interlock control setting for each device of an industrial hot air drying system, including:

[0031] A drying tower 12, wherein the upper feed port of the drying tower 12 is connected to a feed pipeline, and the upper air inlet of the drying tower 12 is connected to the hot air furnace 8 through an air supply pipe;

[0032] A concentrated material pump 17, wherein the concentrated material pump 17 is arranged on the feed pipeline;

[0033] The steam heat exchanger 5 is connected to the hot air furnace 8 through an air outlet pipe.

[0034] Specifically, the feed pipeline is connected to the feed port of the drying tower 12, and the air is sent to the air heating system through the blower 4 for heat exchange and then sent to the drying tower 12. The air heating system mainly includes a steam heater 5 and a hot air furnace 8. The steam control valve 3 is arranged on the steam pipeline, and the burner 7 is arranged on the gas pipeline. The steam control valve 3 and the burner 7 are both connected to the DCS control system 14.

[0035] like Figure 1 As shown: the hot blast furnace 8 is arranged on the gas pipeline, and a burner 7 is arranged on the gas pipeline, and the burner 7 is connected to the hot blast furnace 8.

[0036] Specifically, the burner 7 and the hot blast furnace 8 both adopt existing equipment on the market, and the burner 7 can burn to provide a heat source for the hot blast furnace 8 .

[0037] like Figure 1 As shown: a combustion-supporting blower 6 is arranged on the air inlet pipeline of the hot blast furnace 8, and the combustion-supporting blower 6 draws external air.

[0038] Specifically, the combustion-supporting blower 6 draws in external air to enable the burner 7 to burn fully.

[0039] like Figure 1 As shown: the steam heat exchanger 5 is arranged on the hot air inlet pipeline of the drying tower 12, and a blower 4 is arranged to be connected with the steam heat exchanger 5.

[0040] The air inlet of the steam heat exchanger 5 is connected to the steam regulating valve 3 through a steam pipeline, and the air inlet of the steam regulating valve 3 is also connected to an air pipeline. The steam pipeline and the air pipeline are respectively connected to an instrument air pressure gauge 1 and a steam pressure gauge 2.

[0041] A dust removal device 13 is provided on the air outlet pipeline at the lower end of the drying tower 12, and the air outlet of the dust removal device 13 is connected to the induced draft fan 16 through a pipeline.

[0042] Specifically: The control device in the embodiment of the present application can be a control terminal, and an interface for operation can be set on the control device. Through the operation interface, the opening of the regulating valve 3 can be adjusted, the flow of steam entering the steam heater 5 can be controlled, and the temperature of the hot air furnace 9 after heat exchange can be controlled. The dust removal device 13 and the deodorization device 15 are for treating the exhaust gas discharged by the equipment.

[0043] like Figure 1 As shown: the outlet pipeline of the induced draft fan 16 is connected to a deodorizing device 15, and the induced draft fan 16 is connected to a DCS control system 14 via a wire.

[0044] Specifically, the DCS control system 14 uses the existing architecture equipment system on the market to control the operating status of the blower 4, the burner 7 and the concentrated material pump 17.

[0045] like Figure 1 As shown: the DCS control system 14 is also connected to the blower 4, the burner 7 and the concentrated material pump 17 through wires.

[0046] like Figure 1 As shown: a drying tower pressure gauge 11 is provided on the right side of the drying tower 12, and a hot blast furnace pressure gauge 9 is provided on the upper side of the hot blast furnace 8.

[0047] Specifically: In the embodiments of the present application, all pressure measuring devices can be capacitive pressure transmitters, intelligent pressure transmitters, etc. The embodiments of the present application do not limit this and are prior art.

[0048] like Figure 1 As shown: a smoke exhaust fan 10 is arranged on the smoke exhaust pipeline of the hot blast furnace 8 .

[0049] When using the device, combine Figure 1 and Figure 2 , set the safe operating pressure range of the drying tower pressure gauge 11 of the drying tower 12 to: -400Pa to 1200Pa. When two or more measuring points in the drying tower pressure gauge 11 measure the operating pressure beyond the range of -400Pa to 1200Pa, the DCS control system 14 makes a judgment and triggers the safety interlock. The burner 7 stops supplying gas, the steam control valve 3 is closed to stop supplying steam, the concentrated material pump 17 is shut down, the induced draft fan 16 is shut down, and the blower 4 is shut down in sequence. Other equipment of the air heating system maintains operation, and pays attention to adjusting the motor frequency of the combustion-supporting fan 6 and the smoke exhaust fan 10. Maintain the hot blast furnace pressure gauge 9 within the safe operating pressure range of: -300Pa to 100Pa, which can not only ensure the safety of the drying tower 12, but also can promptly restore the use of the drying tower 12 after eliminating the fault.

[0050] The safe operating pressure range of the hot blast furnace pressure gauge 9 of the hot blast furnace 8 is set to be: -300Pa to 100Pa. When the operating pressure measured by the hot blast furnace pressure gauge 9 at two (or more than two) measuring points exceeds the range of -300Pa to 100Pa, the DCS control system 14 makes a judgment and triggers the safety interlock, and stops the burner 7 from delivering gas, the steam control valve 3 from closing to stop delivering steam, the concentrated material pump 17 from stopping, the induced draft fan 16 from stopping, and the forced draft fan 4 from stopping in sequence. Other equipment of the air heating system maintains operation, and pays attention to adjusting the motor frequency of the combustion-supporting fan 6 and the smoke exhaust fan 10, and adjusts the pressure indication of the hot blast furnace pressure gauge 9 to within the range of: -300Pa to 100Pa, which can not only ensure the safety of the hot blast furnace 8, but also can restore the hot blast furnace 8 to use in time after eliminating the fault.

[0051] Set the steam pressure gauge 2, the pressure range is > 0.3MPa. When the value of the steam pressure gauge 2 is ≤0.3MPa, the DCS control system 14 makes a judgment and triggers the safety interlock. The burner 7 stops supplying gas, the steam control valve 3 is closed to stop supplying steam, the concentrated material pump 17 stops, the induced draft fan 16 stops, and the blower 4 stops in sequence. Other equipment of the air heating system remains in operation, and pay attention to adjusting the motor frequency of the combustion-supporting fan 6 and the smoke exhaust fan 10. Maintain the hot blast furnace pressure gauge 9 within the safe operating pressure range of: -300Pa to 100Pa, so that the hot blast furnace 9 and the drying tower 12 can be put into use again.

[0052] Set the instrument air pressure gauge 1, the pressure range is > 0.3MPa. When the value of the instrument air pressure gauge 1 is ≤0.3MPa, the DCS control system 14 makes a judgment and triggers the safety interlock. The burner 7 stops supplying gas, the steam control valve 3 is closed to stop supplying steam, the concentrated material pump 17 stops, the induced draft fan 16 stops, and the blower 4 stops in sequence. Other equipment of the air heating system remains in operation, and pay attention to adjusting the motor frequency of the combustion-supporting fan 6 and the smoke exhaust fan 10. Maintain the hot blast furnace pressure gauge 9 within the safe operating pressure range of: -300Pa to 100Pa, so that the hot blast furnace 9 and the drying tower 12 can be put into use again.

[0053] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features applied for by the present application.

Claims

1. A safety interlock control method for each device in an industrial hot air drying system, characterized in that: The method is used for the bacterial cell extraction process after industrial tail gas fermentation to produce ethanol. The industrial hot air drying system comprises: A drying tower (12), wherein the upper feed port of the drying tower (12) is connected to a feed pipeline, and the upper air inlet of the drying tower (12) is connected to a hot air furnace (8) via an air supply pipe; a concentrated material pump (17), the concentrated material pump (17) being arranged on the feed pipeline; A steam heat exchanger (5), wherein the steam heat exchanger (5) is connected to a hot air furnace (8) via an air outlet pipe; The hot blast furnace (8) is arranged on a gas pipeline, and a burner (7) is provided on the gas pipeline, and the burner (7) is connected to the hot blast furnace (8); a combustion-supporting blower (6) is provided on the air inlet pipeline of the hot blast furnace (8), and the combustion-supporting blower (6) draws external air; and a smoke exhaust blower (10) is provided on the smoke exhaust pipeline of the hot blast furnace (8); The steam heat exchanger (5) is arranged on the hot air inlet pipeline of the drying tower (12), and a blower (4) is provided to be connected to the steam heat exchanger (5); the air inlet of the steam heat exchanger (5) is connected to the steam regulating valve (3) through a steam pipeline, and the air inlet of the steam regulating valve (3) is also connected to an air pipeline, and the steam pipeline and the air pipeline are respectively connected to an instrument air pressure gauge (1) and a steam pressure gauge (2); A dust removal device (13) is provided on the air outlet line at the lower end of the drying tower (12); the air outlet of the dust removal device (13) is connected to an induced draft fan (16) through a pipeline; the induced draft fan (16) is connected to a DCS control system (14) through a wire; the DCS control system (14) is also connected to an air blower (4), a burner (7) and a concentrated material pump (17) through a wire; A drying tower pressure gauge (11) is provided on the right side of the drying tower (12), and a hot blast furnace pressure gauge (9) is provided on the upper side of the hot blast furnace (8); The control method of the DCS control system includes: When the operating pressure measured at two or more measuring points on the drying tower pressure gauge exceeds the range of -400Pa to 1200Pa, the DCS control system will make a judgment and trigger the safety interlock. The burner will stop supplying gas, the steam control valve will be closed to stop supplying steam, the concentrated material pump will stop, the induced draft fan will stop, and the forced draft fan will stop in sequence. Other equipment in the air heating system will remain in operation, and the motor frequency of the combustion-supporting fan and the exhaust fan will be adjusted. The safe operating pressure range of the hot blast furnace pressure gauge is maintained at: -300Pa to 100Pa; When the operating pressure measured by more than two measuring points of the hot blast furnace pressure gauge exceeds the range of -300Pa to 100Pa, the DCS control system will make a judgment and trigger the safety interlock. The burner will stop supplying gas, the steam control valve will close to stop supplying steam, the concentrated material pump will stop, the induced draft fan will stop, and the forced draft fan will stop. Other equipment in the air heating system will remain in operation, and the motor frequency of the combustion-supporting fan and the exhaust fan will be adjusted to adjust the pressure indication of the hot blast furnace pressure gauge to the range of -300Pa to 100Pa. When the pressure value of the steam pressure gauge is ≤0.3MPa, the DCS control system will make a judgment and trigger the safety interlock. The burner will stop supplying gas, the steam control valve will close and stop supplying steam, the concentrated material pump will stop, the induced draft fan will stop, and the forced draft fan will stop. Other equipment in the air heating system will remain in operation, and the motor frequency of the combustion-supporting fan and the smoke exhaust fan will be adjusted. The safe operating pressure range of the hot blast furnace pressure gauge will be maintained at: -300Pa to 100Pa, so that the hot blast furnace and drying tower can be put into use again. When the pressure value of the instrument air pressure gauge is ≤0.3MPa, the DCS control system makes a judgment and triggers the safety interlock. The burner stops supplying gas, the steam control valve closes and stops supplying steam, the concentrated material pump stops, the induced draft fan stops, and the forced draft fan stops in sequence. Other equipment in the air heating system remains in operation, and the motor frequency of the combustion-supporting fan and the smoke exhaust fan is adjusted. The safe operating pressure range of the hot blast furnace pressure gauge is maintained at: -300Pa to 100Pa, so that the hot blast furnace and drying tower can be put into use again.

2. The safety interlock control method according to claim 1, characterized in that: The outlet pipeline of the induced draft fan (16) is connected to a deodorizing device (15).

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