CN1686771A - Energy saving method of granular material pneumatic conveying system and its device - Google Patents
Energy saving method of granular material pneumatic conveying system and its device Download PDFInfo
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- CN1686771A CN1686771A CN 200510039006 CN200510039006A CN1686771A CN 1686771 A CN1686771 A CN 1686771A CN 200510039006 CN200510039006 CN 200510039006 CN 200510039006 A CN200510039006 A CN 200510039006A CN 1686771 A CN1686771 A CN 1686771A
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Abstract
A energy-saving method for the pneumatic conveying system of powder material features that a flow regulator is arranged to the air inlet pipe of tank pump, a tank pressure sensor is arranged in the tank pump, the flow of compressed air is automatically regulated under the control of computer to make the compressor work in optimal condition, so saving energy.
Description
Technical field
The present invention relates to a kind of power station, thermal power plant power-economizing method and the system with pneumatic material conveying system, specifically a kind of power-economizing method and device thereof of strength powder grain material delivery system can be widely used in the air-transport system of all trades and professions.
Background technology
At present, in construction of hydropower plant, all be arranged on the top of camp site more than tens meters even 100 meters as powder grain material transfer feed bins such as the cement of raw material, yellow ground, fly ash, the way one that is transported to the camp site is to transport by sky way, must build corresponding sky way for this reason, costly and constructional difficulties, also must employ a large amount of vehicles in the transportation, traffic cost is very big.Another method is to adopt air-transport system, the spice pumping plant of the powder grain material that the camp site is used by delivery duct below roll-over is delivered to from ground, this mode has small investment, carries characteristics efficiently, thereby caused various countries' construction of hydropower facilities interest of experts, and obtained application.
It all is from the lower conveying that hoists that traditional pneumatic material is carried, then on the contrary in construction of hydropower facilities, powder grain material must be carried from high to lower.Owing to be subjected to the influence of material deadweight, in the course of conveying,, then be easy to cause the plugging phenomenon if the pressure control in the delivery duct is improper.This also be at present downward Pneumatic conveyer its carry discrepancy in elevation little (be generally tens meters, be tens meters to the maximum) according to former therefore place, and the pressure in the storehouse pump of the pressure in the delivery duct and storage, convey materials is relevant.When the fluctuation of pressure in the pump of storehouse is big, then be easy to cause plugging, and the air feed operating mode of the pressure in the pump of storehouse and compressor there is direct relation.In the existing material pneumatic conveying system, since the charge flow rate of storehouse pump in time automatic compensation to optimum value, in order to guarantee the force value in the pump of storehouse, make the necessary long-term work of compressor under maximum duty, being transported to gas unnecessary in the pump of storehouse then discharges outside the pump of storehouse by delivery duct, caused severe energy waste, separation, the dusting equipment of accepting feed bin simultaneously are also very huge.According to statistics, the discharge capacity that the every increase of compressor is cube is then near the electric weight that consumes 6 kilowatts, so energy dissipation is very surprising.
In addition, material pneumatic conveying system also is widely used in and carries materials such as fly ash, agstone, desulfurization ash in the existing all kinds of firepower electrical plant.And according to the knowledge of the applicant, the charge flow rate of the storehouse pump that uses in the existing power plant does not all have corresponding self-checking device, and the ubiquity compressor discharge rate is excessive and be in the state of operating at full capacity for a long time.
The shortcoming of its existence mainly shows:
When carrying fly ash, the pressure of normal delivery duct is in 0.1～0.3Mpa scope.But when the delivery system individual parameters changed, then delivery system can't be tackled.System's operation fluctuating range is wide, the concentration instability of convey materials, and delivery duct pressure the plugging phenomenon occurs up to 0.5Mpa sometimes, and the user also has strong comments.The drawback of bringing is that air consumption is big, energy consumption is big, and operational throughput is low; Air consumption causes that greatly delivery pipe mill is logical, and the impulsive force that bears of delivery duct is big in addition, occurs that pipe support comes off and shortcoming such as distortion.
The material of material conveying difference (as agstone etc.) time, because the flowing power of material is poor, line pressure is higher during conveying, plugging often occurs.Shortcomings such as pipe wear is big, and operational throughput is low.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can set its suction quantity of operation pressure automatically regulating, and then reduce compressor and operate at full capacity the time, reach the power-economizing method of the granular material pneumatic conveying system of energy-conservation purpose according to the storehouse pump.
Another object of the present invention is according to described method, and a kind of energy saver of granular material pneumatic conveying system is provided.
Technical scheme of the present invention is:
A kind of power-economizing method of granular material pneumatic conveying system; it is characterized in that the at first sensor of the some measurement air pressure of configuration in the pump of storehouse; secondly one cover gas flow adjusting means is installed in the pump admission line of storehouse at least; this flow control device can change and changes the gas flow that enters the storehouse pump from the pressure of dynamic response storehouse pump; make pressure stability in the pump of storehouse within the scope of setting; as the compressor set that links to each other with the storehouse pump automatic flow value of response traffic control apparatus and corresponding compressed air require is provided then; make compressor set be operated in corresponding loading; off-load or shutdown operating mode reach purpose of energy saving.
In order to realize the automatically regulating of flow control device, described baroceptor can be linked to each other with the program control part of PLC, adjustment module and corresponding programming software by PLC are handled the action of dominant discharge control apparatus afterwards, and can be connected to computing machine, handle the back by computing machine and corresponding software and show corresponding valve opening value (0 °～90 °), the pressure that records when baroceptor is during greater than setting value, the PLC adjustment module is sent instruction, reduce charge flow rate by flow control device, the pressure in the pump of storehouse reaches within the error limit that setting value allows; The pressure that records when baroceptor is during less than setting value, and the PLC adjustment module is sent instruction, increases charge flow rate by flow control device, and the pressure in the pump of storehouse reaches within the error limit that setting value allows.
In order to determine the optimum working pressure of storehouse pump, can with mass transport pipeline that the storehouse pump links to each other on the pressure sensor of some monitoring usefulness is set, measure mass transport pipeline fluctuation of pressure state, thereby, and the pressure that this sensor records is shown on digital display meter and computer picture for definite storehouse pump optimum working pressure provides foundation.At first adjust the setup pressure value of storehouse pump, observe the fluctuation of pressure situation in the mass transport pipeline, fluctuation of pressure value minimum in material conveying pipe, and the pressure when satisfying the powder grain material delivery speed in the pump of storehouse, promptly can be used as the operation pressure of setting, set the primary flow value of flow control device more according to this.
The technical scheme of the invention process said method is:
A kind of energy saver of granular material pneumatic conveying system, comprise storehouse pump 1, compressor 2, discharge nozzle 3, storehouse pump 1 links to each other by air inlet pipe 4 with compressor 2, one end of discharge nozzle 3 communicates with storehouse pump 1 inner chamber, it is characterized in that on air inlet pipe 4, being equipped with flow control device 5, storehouse pressure sensor 6 is installed in storehouse pump 4, pipe pressure sensor 7 is installed on discharge nozzle 3, described storehouse pressure sensor 6, pipe pressure sensor 7, flow control device 5 all link to each other with program control part of PLC or computer system.
Described flow control device 5 is made up of electricity-gas valve positioner 8, execution cylinder 9 and flow valve 10, the input of electricity-gas valve positioner 8 links to each other with instrument air, the program control part of PLC or computer system respectively, its output links to each other with execution cylinder 9, carries out cylinder 9 and links to each other with flow valve 10.When the program control part of PLC or computer system are sent control signal to electricity-gas valve positioner 8 according to the signal that corresponding storehouse pressure sensor 6 and/or pipe pressure sensor 7 send under programming control, electricity-gas valve positioner 8 drives according to this signal and relevant feedback signal and carries out cylinder 9 actions, carries out flow valve 10 that 9 drives of cylinder are attached thereto and strengthens or reduce the flow aperture.
Described flow valve 10 can be ball valve.
Beneficial effect of the present invention:
1, first automatic flow rate adjusting device is applied on the admission line of storehouse pump, charge flow rate by the surge bunker pump reaches stablizes operation pressure in the pump of storehouse, thereby reduce the fluctuation of pressure of transfer line, make more balance of delivery system work can not produce the plugging phenomenon.And in descending air-transport system, obtained application first, and obtained remarkable energy saving effect, see the test figures of cement pneumatic conveying experiment writing chart 1～5 for details.
2, this method is simple, and total system is simple in structure, makes, installs very convenient.
3, can be used in all granular material pneumatic conveying systems such as power station, thermal power plant, building materials, chemical industry, metallurgy, energy-saving effect is more obvious when especially using in thermal power plant.Carrying with certain power plant 4 50MW machines assembly 4 cover strengths is example, and the total power consumption of compressor is 528KW, and every cover delivery system is saved 5m
3Pressurized air, can economize on electricity more than 2400 kilowatt hours every day.
4, can reduce the wearing and tearing of delivery duct, prolong the service life of pipeline.
Description of drawings
Fig. 1 is the structural representation of energy saver of the present invention.
Fig. 2 is the structural representation of flow control device of the present invention.
Fig. 3 is an energy-conservation flow regulating control flow block diagram of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
A kind of power-economizing method of granular material pneumatic conveying system, one cover gas flow adjusting means at first is installed in the pump admission line of storehouse in the sensor of storehouse pump allocating and measuring air pressure, and this device can respond the pressure variation of storehouse pump and change the gas flow that enters the storehouse pump.By this flow control device, make pressure stability in the pump of storehouse within the zone of reasonableness of setting.As the source of the gas (compressor assembly) that links to each other with the storehouse pump, then automatic response traffic control apparatus provides corresponding compressed air require, and is operated in corresponding operating mode (loading or off-load, shutdown), reaches purpose of energy saving.It then is the functions that all have in a kind of all compressions at present that compressor set is carried out the self adaptation adjustment according to delivery pressure and flow, and present embodiment is no longer described.
The optimum working pressure of storehouse pump can be determined by the following method: with mass transport pipeline that the storehouse pump links to each other on be provided with some monitoring usefulness, measure mass transport pipeline fluctuation of pressure state, thereby for determining that storehouse pump optimum working pressure provides the sensor of foundation, and the force value that sensor records is shown in digital display meter, computer picture; The opening of manual regulation flow control device, and corresponding pressure in the pump of storehouse shown in digital display meter, computer picture, observe the fluctuation of pressure situation in the powder grain material transfer line simultaneously, when the fluctuation of pressure value in the material conveying pipe minimum and when satisfying material mass transport speed the pressure in the pump of storehouse can be used as the operation pressure of setting, this moment, the opening degree (flow value) of flow control device was the primary flow value.
Start the storehouse pump then and begin feed, the pressure that records when baroceptor is during greater than setting value, and flow control device reduces flow, and the pressure in the pump of storehouse reaches within the error limit that setting value allows.The pressure that records when baroceptor is during less than setting value, and flow control device increases flow, and the pressure in the pump of storehouse reaches within the error limit that setting value allows, and the pressure of this moment is the best smooth working force value of storehouse pump.
The energy saver of realization said method as shown in Figure 1, 2, 3.
A kind of energy saver of granular material pneumatic conveying system, comprise storehouse pump 1, compressor 2, discharge nozzle 3, storehouse pump 1 links to each other by air inlet pipe 4 with compressor 2, one end of discharge nozzle 3 communicates with storehouse pump 1 inner chamber, flow control device 5 is installed on air inlet pipe 4, storehouse pressure sensor 6 is installed in storehouse pump 4, pipe pressure sensor 7 is installed on discharge nozzle 3, described storehouse pressure sensor 6, pipe pressure sensor 7, flow control device 5 all link to each other with program control part of PLC or computer system (CRT).
Described flow control device 5 is made up of electricity-gas valve positioner 8 (model can be the YT1000R type), execution cylinder 9 and flow valve 10 (can be ball valve), the input of electricity-gas valve positioner 8 links to each other with instrument air, the program control part of PLC or computer system respectively, its output links to each other with execution cylinder 9, carries out cylinder 9 and links to each other with flow valve 10.When the program control part of PLC or computer system are sent control signal to electricity-gas valve positioner 8 according to the signal that corresponding storehouse pressure sensor 6 and/or pipe pressure sensor 7 send under programming control, electricity-gas valve positioner 8 drives according to this signal and relevant feedback signal and carries out cylinder 9 actions, carries out flow valve 10 that 9 drives of cylinder are attached thereto and strengthens or reduce the flow aperture.
The flow regulating process of present embodiment as shown in Figure 3.
Cement pneumatic conveying experiment writing chart 1
(2004/12/3)
| Test number (inferior) | Test period | Ambient temperature (℃) | Ambient humidity | Charge amount (t) | Pressurized air integrated flux (m 3) | Time of delivery (min) | Air accumulator pressure gos up time time (min) | Air inlet valve aperture scope (degree) | Storehouse pump pressure scope (Mpa) | Turn on pump pressure (Mpa) | Delivery duct range of pressure (Mpa) | Help and blow opening of valves number of times (inferior) | Operational throughput (t/h) | |
| First group | Second group | |||||||||||||
| ??1 | ??12:52 | ??3.12 | ??6 | ??45°～90° | ??0.17～0.25 | ??0.1 | ??0.08～0.163 | ??31.2 | ||||||
| ??2 | ??13:02 | ??3.14 | ??7 | ??0°～90° | ??0.18～0.32 | ??0.1 | ??0.1～0.186 | ??26.9 | ||||||
| ??3 | ??13:17 | ??3.57 | ??3.5 | ??75°～90° | ??0.18～0.32 | ??0.1 | ??0.12～0.217 | ??61.2 | ||||||
| ??4 | ??13:31 | ??4.0 | ??3.0 | ??80°～90° | ??0.18～0.32 | ??0.36 | ??0.1～0.23 | ??80.0 | ||||||
| ??5 | ??13:58 | ??3.06 | ??6.2 | ??85°～90° | ??0.22～0.35 | ??0.268 | ??0.15～0.259 | ??3 | ??29.6 | |||||
| ??6 | ??14:10 | ??6.28 | ??7.0 | ??85°～90° | ??0.23～0.38 | ??0.368 | ??0.15～0.258 | 2 (tests 1) | ??53.8 | |||||
| ??7 | ??16:07 | ??6.18 | ??7.528 | ??8.0 | ??85°～90° | ??0.21～0.34 | ??0.36 | ??0.14～0.23 | ??46.35 | |||||
| ??8 | ??17:15 | ??7.12 | ??5.627 | ??7.0 | ??85°～90° | ??0.21～0.35 | ??0.35 | ??0.15～0.22 | 1 (test) | 1 (test) | ??61.0 | |||
| ??9 | ||||||||||||||
| ??10 | ||||||||||||||
Cement pneumatic conveying experiment writing chart 2
(2004/12/5)
| Test number (inferior) | Test period | Ambient temperature (℃) | Ambient humidity | Charge amount (t) | Pressurized air integrated flux (m 3) | Time of delivery (min) | Air accumulator pressure gos up time time (min) | Air inlet valve aperture scope (degree) | Storehouse pump pressure scope (Mpa) | Turn on pump pressure (Mpa) | Delivery duct range of pressure (Mpa) | Help and blow opening of valves number of times (inferior) | Operational throughput (t/h) | |
| First group | Second group | |||||||||||||
| ?1 | ??10:15 | ?3.2 | ??4.0 | ?85°～90° | 0.1～0.32 | ??0.26 | ?0.114～0.215 | ?48 | ||||||
| ?2 | ??10:20 | ?1.2 | ??3.0 | ?85°～90° | 0.1～0.354 | ??0.32 | ?0.08～0.129 | ?24 | ||||||
| ?3 | ??10:33 | ?6.2 | ??4.8035 | ??6.5 | ?85°～90° | 0.1～0.393 | ??0.284 | ?0.102～0.225 | ?57.2 | |||||
| ?4 | ??10:47 | ?6.44 | ??4.32 | ??7.0 | ?80°～90° | 0.268～0.39 | ??0.278 | ?0.081～0.223 | ?55.2 | |||||
| ?5 | ??10:57 | ?6.12 | ??3.925 | ??6.0 | ?80°～90° | 0.193～0.294 | ??0.273 | ?0.142～0.24 | ?61.2 | |||||
| ?6 | ??12:05 | ?6.27 | ??4.651 | ??7.0 | ?80°～90° | 0.075～0.317 | ??0.216 | ?0.061～0.229 | ?53.7 | |||||
| ?7 | ??12:24 | ?5.28 | ??4.649 | ??5.4 | ?80°～90° | 0.187～0.313 | ??0.276 | ?0.068～0.205 | ?58.67 | |||||
| ?8 | ||||||||||||||
| ?9 | ||||||||||||||
| ?10 | ||||||||||||||
Cement pneumatic conveying experiment writing chart 3
(2004/12/10)
| Test number (inferior) | Test period | Ambient temperature (℃) | Ambient humidity | Charge amount (t) | Pressurized air integrated flux (m 3) | Time of delivery (min) | Storage tank pressure gos up time time (min) | Air inlet valve aperture scope (degree) | Storehouse pump pressure scope (Mpa) | Turn on pump pressure (Mpa) | Delivery duct range of pressure (Mpa) | Help and blow opening of valves number of times (inferior) | Operational throughput (t/h) | |
| First group | Second group | |||||||||||||
| ??1 | ??10:21 | ??3.1 | ??6.0 | ??85°～90° | ??0.2～0.35 | ??0.2 | ??0.08～0.171 | ??31 | ||||||
| ??2 | ??10:50 | ??6.1 | ??11.0 | ??85°～90° | ??0.17～0.37 | ??0.12 | ??0.08～0.209 | ??33.27 | ||||||
| ??3 | ||||||||||||||
| ??4 | ||||||||||||||
| ??5 | ||||||||||||||
| ??6 | ||||||||||||||
| ??7 | ||||||||||||||
| ??8 | ||||||||||||||
| ??9 | ||||||||||||||
| ??10 | ||||||||||||||
Cement pneumatic conveying experiment writing chart 4
(2004/12/24)
| Test number (inferior) | Test period | Ambient temperature (℃) | Ambient humidity | Charge amount (t) | Pressurized air integrated flux (m 3) | Time of delivery (mi n) | Storage tank pressure gos up time time (min) | Air inlet valve aperture scope (degree) | Storehouse pump pressure scope (Mpa) | Turn on pump pressure (Mpa) | Delivery duct range of pressure (Mpa) | Help and blow opening of valves number of times (inferior) | The unimpeded time (mi n) | Operational throughput (t/h) | |
| First group | Second group | ||||||||||||||
| ??1 | ??10:02 | ??6.95 | ??1.453 | ??10.0 | ??85°～90° | ??0.279～0.309 | ??0.279 | ??0.057～0.225 | ??41.7 | ||||||
| ??2 | ??10:25 | ??6.84 | ??0.689 | ??9.0 | ??85°～90° | ??0.125～0.310 | ??0.125 | ??0.012～0.212 | ??45.6 | ||||||
| ??3 | ??10:44 | ??6.38 | ??0.689 | ??8.0 | ??85°～90° | ??0.28～0.307 | ??0.28 | ??0.02～0.232 | ??47.85 | ||||||
| ??4 | ??10:56 | ??6.25 | ??1.08 | ??10.0 | ??85°～90° | ??0.28～0.305 | ??0.28 | ??0.02～0.221 | ??37.5 | ||||||
| ??5 | ??13:12 | ??6.2 | ??1.34 | ??9.0 | ??85°～90° | ??0.27～0.30 | ??0.27 | ??0.024～0.20 | ??41.3 | ||||||
| ??6 | ??13:24 | ??7.8 | ??1.27 | ??10.0 | ??85°～90° | ??0.26～0.301 | ??0.26 | ??0.019～0.213 | ??46.8 | ||||||
| ??7 | ??13:38 | ??6.2 | ??10.0 | ??85°～90° | ??0.26～0.30 | ??0.26 | ??0.01～0.19 | ??37.2 | |||||||
Cement pneumatic conveying experiment writing chart 5
(2004/12/30)
| Test number (inferior) | Test period | Ambient temperature (℃) | Ambient humidity | Charge amount (t) | Pressurized air integrated flux (m 3) | Time of delivery (min) | Air accumulator pressure gos up time time (mi n) | Air inlet valve aperture scope (degree) | Storehouse pump pressure scope (Mpa) | Turn on pump pressure (Mpa) | Delivery duct range of pressure (Mpa) | Help and blow opening of valves number of times (inferior) | The unimpeded time (mi n) | Operational throughput (t/h) | |
| First group | Second group | ||||||||||||||
| ??1 | ??10:06 | ??10.5 | ??66％ | ??6.3 | ??6.0 | ??0°～90° | ??0.11～ | ??0.11 | ??0.02～ | ??4.5 | ??63.0 | ||||
| ??2 | ??12:48 | ??6.6 | ??2.384 | ??9.0 | ??80°～90° | ??0.19～0.354 | ??0.19 | ??0.02～0.226 | ??6.0 | ??44 | |||||
| ??3 | ??13:01 | ??13.7 | ??54％ | ??6.28 | ??1.842 | ??7.3 | ??75°～90° | ??0.25～0.354 | ??0.25 | ??0.02～0.233 | ??3.5 | ??51.6 | |||
| ??4 | ??13:14 | ??13.7 | ??54％ | ??7.34 | ??2.15 | ??8.5 | ??0°～90° | ??0.3～0.355 | ??0.3 | ??0.02～0.232 | ??1.06 | ??51.8 | |||
| ??5 | ??13:28 | ??13.9 | ??54％ | ??6.3 | ??1.74 | ??7.0 | ??80°～90° | ??0.33～0.35 | ??0.33 | ??0.02～0.22 | ??1.0 | ??54 | |||
| ??6 | ??13:37 | ??13.5 | ??53％ | ??6.31 | ??1.63 | ??7.0 | ??70°～90° | ??0.33～0.354 | ??0.33 | ??0.02～0.221 | ??1.4 | ??54 | |||
Claims (6)
1, a kind of power-economizing method of granular material pneumatic conveying system, it is characterized in that the at first sensor of the some measurement air pressure of configuration in the pump of storehouse, secondly one cover gas flow adjusting means is installed in the pump admission line of storehouse at least, this flow control device can change and changes the gas flow that enter the storehouse pump from the pressure of dynamic response storehouse pump, makes pressure stability in the pump of storehouse within the scope of setting.As the compressor set that links to each other with the storehouse pump automatic flow value of response traffic control apparatus and corresponding compressed air require is provided then, make compressor set be operated in corresponding loading, off-load or shut down operating mode, reach purpose of energy saving.
2, the power-economizing method of granular material pneumatic conveying system according to claim 1, it is characterized in that described baroceptor is linked to each other with the program control part of PLC, adjustment module and corresponding programming software by PLC are handled the action of dominant discharge control apparatus afterwards, and can be connected to computing machine, handle the back by computing machine and corresponding software and show the corresponding valve opening value, the pressure that records when baroceptor is during greater than setting value, the PLC adjustment module is sent instruction, reduce charge flow rate by flow control device, the pressure in the pump of storehouse reaches within the error limit that setting value allows; The pressure that records when baroceptor is during less than setting value, and the PLC adjustment module is sent instruction, increases charge flow rate by flow control device, and the pressure in the pump of storehouse reaches within the error limit that setting value allows.
3, the power-economizing method of granular material pneumatic conveying system according to claim 1, it is characterized in that with mass transport pipeline that the storehouse pump links to each other on the pressure sensor of some monitoring usefulness is set, measure mass transport pipeline fluctuation of pressure state, and on digital display meter and computing machine, show, for determining that storehouse pump optimum working pressure provides foundation, at first adjust the setup pressure value of storehouse pump, observe the fluctuation of pressure situation in the mass transport pipeline, fluctuation of pressure value minimum in material conveying pipe, and the pressure when satisfying the powder grain material delivery speed in the pump of storehouse, promptly can be used as the operation pressure of setting, set the primary flow value of flow control device more according to this.
4, a kind of energy saver of granular material pneumatic conveying system, comprise storehouse pump (1), compressor (2), discharge nozzle (3), storehouse pump (1) links to each other by air inlet pipe (4) with compressor (2), one end of discharge nozzle (3) communicates with storehouse pump (1) inner chamber, it is characterized in that on air inlet pipe (4), being equipped with flow control device (5), storehouse pressure sensor (6) is installed in storehouse pump (4), pipe pressure sensor (7) is installed, described storehouse pressure sensor (6) on discharge nozzle (3), pipe pressure sensor (7), flow control device (5) all links to each other with program control part of PLC or computer system.
5, the energy saver of granular material pneumatic conveying system according to claim 4, it is characterized in that described flow control device (5) by electricity-gas valve positioner (8), carry out cylinder (9) and flow valve (10) is formed, the input of electricity-gas valve positioner (8) links to each other with instrument air, the program control part of PLC or computer system respectively, its output links to each other with execution cylinder (9), carries out cylinder (9) and links to each other with flow valve (10).
6, the energy saver of granular material pneumatic conveying system according to claim 5 is characterized in that described flow valve (10) is a ball valve.
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