CN201031083Y - Gas control cell used for dense phase airflow conveying - Google Patents
Gas control cell used for dense phase airflow conveying Download PDFInfo
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- CN201031083Y CN201031083Y CNU2007200706250U CN200720070625U CN201031083Y CN 201031083 Y CN201031083 Y CN 201031083Y CN U2007200706250 U CNU2007200706250 U CN U2007200706250U CN 200720070625 U CN200720070625 U CN 200720070625U CN 201031083 Y CN201031083 Y CN 201031083Y
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Abstract
The utility model relates to a gas control unit for dense-phase air conveying, which comprises a programmable logic controller (PLC), a gas flow measuring system, a compressor (or a fan), a temperature sensor, a gas flow counter, a pressure sensor, and a rotary valve sequentially connected with each other. The utility model additionally comprises a flow regulating valve which is arranged between the compressor (or the fan) and the temperature sensor. The utility model has the advantages that the pressure displayed by the pressure sensor can not only bring pressure compensation on the gas flow counter, but also directly reflect the delivery pressure of the air conveying, and is a device which has a small pressing damage and can automatically adapt to the change of the material feeding quantity of the rotary valve and the change of the conveying way.
Description
Technical field
The utility model relates to a kind of gas control unit of pneumatic conveyer, relates in particular to a kind of stream of dense phase gas at a slow speed feedway that is applicable to the solid grain in the industries such as petrochemical complex, metallurgy, food, medicine.
Background technology
For the carrying of solid granule in the factory, usually need to adopt the gas delivery technology, promptly utilize the air of certain pressure and tolerance or nitrogen as power, solid granule is sent to an other place or many places by a place, also can concentrate and be sent to a place by the many places material.
As seen from Figure 1: divide dilute phase gas delivery and dense phase gas stream to carry.
In delivery system, certain as caliber D and pipe range L, the relation of test pressure differential Δ p on the cross-section of pipeline and pipe end place air-flow velocity as shown in Figure 1.On pressure drop minimum value right side, material almost is distributed in cross-section of pipeline uniformly, Here it is so-called dilute phase delivery area; Along with the gas prompt drop is low, there is a unstable delivery area; Gas speed further reduces, and there is the conveyor zones on particle sandy beach or particle mound in left side, unstable delivery area, and this zone is called as close phase delivery area.
The opereating specification of close phase delivery area gas speed is narrow, adds that the air leakage for rotovalve under the different delivery pressure conditions is different, and operating pressure is big more, and the air leakage of rotovalve is big more.Therefore, when the design flow delivery systems, need to control well gas flow, to prevent generator tube line putty or to deliver into the range of instability.
Usually, the method for the suction quantity of controlling plumbing fixtures has Laval pipe and gas control unit.
As seen from Figure 2: (absolute pressure is P in that stable source of the gas is arranged
0) prerequisite under, utilize the caliber of control Laval pipe trunnion and the angle of expansion segment, make gas reach the velocity of sound, as diffuser absolute pressure P3≤0.85P in the speed of Laval pipe trunnion
0The time, the gas flow that can realize entering pipeline is constant.
But, the shortcoming of Laval management and control system flow is that the loss of pressure of gas on the Laval pipe is bigger, has lost 15% absolute pressure value, and common Laval pipe is uncontrollable, for the situation that is sent to multiple spot by a bit, then need a plurality of Laval pipes to carry out flow control.Conventional gas control unit is to becoming the gas flow setting value that then needs to revise PLC when operational throughput is sent to multiple spot with a bit, and it is more loaded down with trivial details to operate, and also causes mistake easily.
As seen from Figure 3: this gas control unit is connected and composed in proper order by PLC, the FI of gas flow measurement system and compressor or blower fan M, temperature sensor TT, gas flow counter PDT, pressure sensor PT, flow control valve FC, rotovalve M1.This constructional feature is on the position after gas flow regulating valve is placed on comparison, and the pressure that pressure sensor shows can not directly reflect the delivery pressure of gas delivery, thereby can't carry out related with rotovalve blanking amount or fed distance variation gas control.Before the close beginning of conveying mutually, must configure the blanking amount of rotovalve, and the controlling valu of giving PLC designated gas flow according to its blanking amount.
Summary of the invention
The utility model technical issues that need to address have provided a kind of gas control unit that dense phase gas stream is carried that is used for, and are intended to solve the above problems.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions:
The utility model comprises: PLC, gas flow measurement system and compressor or blower fan, temperature sensor, gas flow counter, pressure sensor, rotovalve connect and compose successively; Also comprise a flow control valve; Described flow control valve is placed between compressor or blower fan and the temperature sensor;
Compared with prior art, the beneficial effects of the utility model are: the pressure that pressure sensor shows both can carry out pressure compensation to gas flow counter, had directly reflected the delivery pressure of gas delivery again; Be the equipment that a kind of crushing is little, can adapt to rotovalve blanking quantitative changeization or delivery conduit variation automatically.
Description of drawings
Fig. 1 is strength feed status figure;
Fig. 2 is the principle of Laval management and control system flow;
Fig. 3 is the gas control unit constructional drawing of prior art;
Fig. 4 is the utility model constructional drawing;
Fig. 5 adopts the utility model to carry scheme drawing for the dense phase gas stream of different operational throughpuies;
Fig. 6 adopts the utility model to carry scheme drawing for the dense phase gas stream of different fed distance;
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the utility model is described in further detail:
As seen from Figure 4: the utility model comprises: PLC, the FI of gas flow measurement system and compressor or blower fan M, temperature sensor TT, gas flow counter PDT, pressure sensor PT, rotovalve M1 connect and compose in proper order; Also comprise a flow control valve FC; Described flow control valve FC is placed between compressor or blower fan M and the temperature sensor TT.
As seen from Figure 5: for the dense phase gas stream delivering gas control unit of different operational throughpuies, when rotovalve did not have blanking, because the delivery pressure value of measuring is very low, control cock controlled to gas flow and carries minimum gas flow V0; When rotovalve begins blanking, pressure measuring value (as P1) begins to rise, PLC automatically the adjustments of gas flow to corresponding flow value (as V1); The blanking amount is big more, and pressure measuring value is high more, and cooresponding gas flow value is big more; When a certain blanking amount, when pressure measuring value arrives the limit of pressure of setting, PLC will automatically move along force value horizontal alignment right side and transfer the atmospheric flow, and feed status figure has determined when tolerance increases to a certain value, pressure measuring value can be the upper pressure limit value of setting, and system then can be stabilized in this point operation.
As seen from Figure 6: for the dense phase gas stream delivering gas control unit of different fed distance, when rotovalve did not have blanking, because the delivery pressure value of measuring is very low, control cock controlled to gas flow and carries minimum gas flow V0; When rotovalve begins blanking, and when carrying along short travel line, pressure measuring value (as P1) begins to rise, PLC automatically the adjustments of gas flow to corresponding flow value (as V1); Travel line is far away more, and pressure measuring value is high more, and cooresponding gas flow value is big more; When to a certain fed distance, when pressure measuring value arrives the limit of pressure of setting, PLC will automatically move along force value horizontal alignment right side and transfer the atmospheric flow, and feed status figure has determined when tolerance increases to a certain value, pressure measuring value can be the upper pressure limit value of setting, and system then can be stabilized in this point operation.
Claims (1)
1. one kind is used for the gas control unit that dense phase gas stream is carried, and comprising: PLC, gas flow measurement system and compressor or blower fan, temperature sensor, gas flow counter, pressure sensor, rotovalve connect and compose successively; It is characterized in that: also comprise a flow control valve; Described flow control valve is placed between compressor or blower fan and the temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200706250U CN201031083Y (en) | 2007-06-05 | 2007-06-05 | Gas control cell used for dense phase airflow conveying |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200706250U CN201031083Y (en) | 2007-06-05 | 2007-06-05 | Gas control cell used for dense phase airflow conveying |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201031083Y true CN201031083Y (en) | 2008-03-05 |
Family
ID=39162977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200706250U Expired - Lifetime CN201031083Y (en) | 2007-06-05 | 2007-06-05 | Gas control cell used for dense phase airflow conveying |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201031083Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063259A (en) * | 2012-12-24 | 2013-04-24 | 北京七星华创电子股份有限公司 | Pipeline pressure detection and control system |
| CN106594981A (en) * | 2016-11-30 | 2017-04-26 | 宁波奥克斯电气股份有限公司 | Dislocation detecting and self-repairing control method for temperature detectors of dual-compressor air conditioning system |
-
2007
- 2007-06-05 CN CNU2007200706250U patent/CN201031083Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063259A (en) * | 2012-12-24 | 2013-04-24 | 北京七星华创电子股份有限公司 | Pipeline pressure detection and control system |
| CN103063259B (en) * | 2012-12-24 | 2016-04-13 | 北京七星华创电子股份有限公司 | Pipeline pressure inspection and control system |
| CN106594981A (en) * | 2016-11-30 | 2017-04-26 | 宁波奥克斯电气股份有限公司 | Dislocation detecting and self-repairing control method for temperature detectors of dual-compressor air conditioning system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 4, building 22, 376, Lane 200040, Shanghai, West Yan'an Road (East) Co-patentee after: SINOPEC Shanghai Engineering Company Limited Patentee after: KSD Bulk Solids Engineering Co., Ltd. Address before: 4, building 22, 376, Lane 200040, Shanghai, West Yan'an Road (East) Co-patentee before: Sinopec Shanghai Engineering Co., Ltd. Patentee before: KSD Bulk Solids Engineering Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080305 |