The thermal power plant must unceasingly discharge the massive
coals ash every day, is how safe reliably removes the coal ash to the
very many engineers and technicians to say all is an extremely thorny
question. Must know that, the highly effective pipeline
transmission and the waste assignment management involves to many has
the challenge technology the question, the energy efficiency
management question is one of them.
This point says the count for much to the present many
traditions power plants, in particular China's power plant.
Because the Chinese government gradually is letting loose to the
energy industry management, these power plants diligently seek in the
electricity generation and the power distribution aspect renew a more
effective method.
The policy-makers also realized to will have to win the future
the market, will have to have to enhance the efficiency, will reduce
the production cost.
The Rockwell automation China company and the Chinese
great-hearted automatic control company cooperated to 威海 the power
plant has carried on the equipment transformation, greatly improved
the equipment performance and uses electricity the efficiency,
meanwhile rapidly reduced the cost.
Challenge:
威海 the power plant is located the Chinese Shandong
Province's eastern part coastal area which the economy rapidly soars,
is evaluated by the Chinese country electric power committee level of
power plants. This large-scale power plant presently has two 125
megawatts and two 300 megawatt units, moreover in the near future also
has two 600 megawatt power plants investments movement.
Electricity generation process itself is been surprised which
many people needs to consume very many electrical energies. The
reduced electrical energy consumption reduces the cost, also is the
world each place power plant pursue goal. Especially encourages
the reduced production total cost in the government China, this
question appears importantly, each place power plant all diligently is
seeking the solution industrial production management the effective
means.
威海 the power plant transformation meets the biggest
challenge is the coal mortar pipeline motor control and the mortar
pumps the operating mode movement. The coal tar pipeline uses
the valve which three industries pumps to carry on the flow control,
then the ash mixture ships Shui Hemei to the distant place
sedimentation pond. This treating processes are by three 500
horsepower, 6 千伏?direct motor drives.
In the original system, valve opening all is decided with the
closure by the estimate coal tar quantity which relates with the load
required quantity. No matter transports the coal tar quantity is
how many, these three 500 horsepower, 6 千伏?electric motors all
continuously full speed revolve. In addition, planned time the
engine off "to be hard" the engine off method also to pose the threat
to the electric motor performance, thus frequently had to spend quite
many funds to carry on the service to the electric motor.
The original system spends every year the cost is astonishing,
but 威海 the power plant never systematically has counted, the
production management personnel only can approximately estimate from
this the economical influence which produces.
Seeks the effective method solution coal tar pipeline movement
since the power plant management level determination the question,
engineers start to seek both have the supplier which the rich
experience and can provide the consummation customer support to think
the power plant provides the best equipment to transform the solution.
They have chosen the Rockwell automation China company and the
great-hearted automatic control engineering firm for this factory
important strategy partner, the great-hearted automatic control
engineering firm are the Chinese biggest electric power holding
company SEPCO subsidiary company.
Solution:
Two companies' engineers transported the network aspect in the
use frequency conversion drive control motor speed and the revolution
and the pipeline to obtain the consensus of opinion. Uses this
plan, the electric motor may according to the need revolution, in
other words, the electric motor may act according to the actual load
required quantity effectively to lead the coal ash conveying
arrangement by the lowest rotational speed.
Because coal mortar flowing is through the frequency conversion
drive control, therefore the pipe-line valve may continuously assume
opens the condition. In addition, but also may cause the
electric motor and "the hard closure" transforms by "the hard start"
into the soft start and the soft closure, like this, both has
guaranteed the electric current steadiness, and does not harm the
electric circuit and the motor performance. The frequency
conversion actuation also greatly reduced the energy consumption,
saved the big pen energy cost.
The Rockwell automation company's center presses drive
PowerFlex7000 is this complete automation solution core. This
kind of 18 pulses frequency conversion installment is renewable
applies the brake, may realize motor braking in not to need to attach
the software and hardware under the condition to feed back the
electrical energy the power plant. This frequently needs rapidly
to decelerate regarding because the high inertia load pumps, the air
blower and the air blower says is extremely ideal.
The output voltage and the output current also assume the
extremely good sine wave, this meant it may the direct drive cable
telegram motive, but does not need to adopt filter measure and so on
falls the power use or increases, the electric motor operating
temperature cannot have the obvious rise. At the same time,
because PowerFlex is the 6kV frequency conversion installment, it does
not need to install such increase very many extra expenditures like
the 3kV frequency conversion very big, at the same time is easy to
crash falls presses and rises to press the hardware equipment.
The great-hearted company has provided with it necessary
engineering design and the integrated service, meanwhile is
responsible for 18 pulses insulating transformer which the local
purchase needs. The Rockwell automation company's global
production plan group also provided completely started and the field
test service guarantees the system the integrity and its the
performance.
Achievement:
Before the transformation, 威海 the power plant three mortar
pump in August must use the altogether 94,860 kilowatt-hours electric
quantities with the electric quantity peak. After the
transformation, in the identical month, only has 51,840 kilowatt-hours
with the electric quantity, dropped 45% with the electric quantity.
The equipment cut and the start is extremely quick, requests
from to start to stops not surpassing for 4 hours, will generate
electricity the severance to reduce to the most mild degree.
This plan is carries on in 威海 power plant all original
electric motors and in the motor control circuit breaker foundation.
In addition, the new control device also is in the scope which
disposes in the existing equipment room and the electric circuit
carries on the transformation, it sped up the implementation, has
saved the cost for the later engineering design and the hardware.
Because center presses the obvious benefit which the solution
brings, 威海 the power plant has signed the agreement to carry on
the transformation to their boiler air blower unit equipment motor
control.
"The Rockwell automation and the great-hearted company
collaborates the cooperation to cause us to press the benefit to this
in which the solution brings to be full of confidence." 威海
power plant Chief Engineer Tong Ming Guang
said, "in addition, they cause the partner in the customer service and
the project technical support aspect good prestige which they becomes
us to be worth relying on, will cause us to obtain a bigger result in
the next production."
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