CN85104564A

CN85104564A - Regulate the flue gas optimization method

Info

Publication number: CN85104564A
Application number: CN85104564.2A
Authority: CN
Inventors: 弗朗兹·诺伊林格
Original assignee: Metallgesellschaft AG
Current assignee: GEA Group AG
Priority date: 1985-06-14
Filing date: 1985-06-14
Publication date: 1986-12-10
Also published as: CN1010383B

Abstract

The present invention regulates the method for optimizing for flue gas when carrying out the flue gas dedusting with electrostatic precipitator.Be characterized in flue gas, injecting conditioning agent, as, SO ₃, NH ₃Or triethylamine.Each stage conditioning agent injection rate M can change, to each charge velocity M ₁The current value and/or the volt that are associated detect, storage; With next stage measured value relatively, when under given current condition, just stop the change of charge velocity when again not detecting the increase of volt.Method of the present invention is based on such imagination, even when other parameter changes, can find a charge velocity value, makes corresponding volt the highest.

Description

Regulate flue gas sorrow method

The invention relates to flue gas adjusting optimization method when carrying out the flue gas dedusting with electrostatic precipitator.Its method is to inject conditioning agent in flue gas, for example, and SO ₃, NH ₃, or triethylamine.

As everyone knows,, cause flue gas to be in good dedusting condition, so just can improve the efficiency of dust collection of electrostatic precipitator widely if inject some conditioning agents to flue gas.Do the dedusting resistance after this manner and just can reduce ten times, 100 times, make electrostatic precipitation to improve significantly.Yet in some cases, it is uneconomic implementing it.Truth is very clearly, and this is because polluter discharging tolerable limit value little by little reduces, also because many factories in order to reduce production costs, adopt various fuels sources progressively.

With respect to a given dust arrester,, then require this device of certain scale to change its operating condition in the high flexible mode in order to guarantee remaining dustiness restriction in allowed limits.Consider these problems from the angle of economy, then got rid of the possibility that adopts excessive dust collect plant, also got rid of the possibility of using the overtreatment conditioning agent.Because overtreatment ground uses conditioning agent can cause producing arcing arcing phenomenon in electrostatic precipitator.And everybody is clear, and the generation of this phenomenon can cause the reduction of separative efficiency.

For the above reasons, the objective of the invention is: control and optimization make electrostatic precipitator under certain conditions in order to the injection rate of the conditioning agent of adjusting flue gas, can obtain best dust catching efficiency.

Above-mentioned purpose can be realized by following measure, promptly changes the charge velocity M of the conditioning agent in each stage; To in the electrostatic precipitator, the electrostatic precipitator current value and/or the voltage volt that are associated with the conditioning agent charge velocity M in each stage detect, store, and detected numerical value is compared in the stage that is close to the next one.When again not detecting the increase of volt under the condition at given electric current, just can stop the change of conditioning agent charge velocity.

When above-mentioned current value and/or volt descend with predetermined minimum of a value, can consider also that then restarting to change by stages conditioning agent adds speed M.Each stage that changes the conditioning agent charge velocity with separately blanking time △ T each other mutually then ground connection work.The increment that each stage conditioning agent adds speed is △ M.Can be scheduled to △ T and △ M in operating process is constant.If the coded program with electronic computer goes to control and preferred above-mentioned numerical value, then its result will be more satisfactory.Boiler load in the production process, gas velocity, parameters such as gas temperature also can be directly inputted in this coded program.

With reference to block flow diagram among Fig. 1 and the diagramatic curve among Fig. 2, this paper further illustrates details of the inventive method and its advantage.

Fig. 1 is the utmost point rough schematic view of electrostatic force deduster, and it has comprised three regional I, II and III, and these three zones are tactic along flow direction, and feeds high volt electric current independently in the zone separately.The gas of udst separation is carried out in preparation, by the pipeline among the figure 2, flows into electric precipitator 1.On the pipeline 2 in the drawings, a conditioning agent ejector filler 4 is arranged.The fume duct device that has purified by pipeline 3, leaves electrostatic precipitator 1.On the pipeline 3 in the drawings, settled suitable detector 9, in order to detect remaining dust content.

In operating process, continuously measure in the electrostatic precipitator separately volt and current value in each regional I, II and the III, and handle with miniature

electronic calculator

11,12 and 13 etc.Then, enter data in the control system 10.Represent the signal of pure qi (oxygen) dustiness measured value also to be input in the control system.In addition, other disturbance variable in the production process, for example, and boiler load 5, gas velocity 6 or gas temperature 7 also can be input in the control system 10.

By means of this control system 10, make last control device 8 change the charge velocity that is injected into the conditioning agent in the flue gas of preparing udst separation according to certain time interval △ T, the change value of speed is minimum increment △ M.When electrostatic precipitator during, if when the operation volt kept increasing along with the change of conditioning agent charge velocity, then the change of this charge velocity was constant with the current practice of maximum.But when the operation volt no longer increased along with the change of the charge velocity of conditioning agent, then the charge velocity of conditioning agent at this moment kept constant constant.After, have only the volt of working as, when current value or other parameter changed with predetermined value, the charge velocity of conditioning agent then changed again once more by stages so, so that deduster can be obtained best separative efficiency.Therefore, on opposite meaning, we are appreciated that and promptly work as dust arrester under the current condition of maximum, if the reduction of operation volt has taken place, will cause the charge velocity change stage by stage of conditioning agent.In the operating process, the increment in each stage (△ T and △ M), or predetermined, or under coded program control automatic goodization.

As time goes on and three curves of the variation that takes place shown among Fig. 2 that the operation volt that is divided into trizonal electrostatic precipitator.This variation is the current value 0.16 milliampere/rice in maximum ²Operating condition under, with conditioning agent SO ₃The change of charge velocity and corresponding.Three curves from Fig. 2 can see, the peak value of each curve all is that the injection rate at conditioning agent is on the position of 20 volume PPM.Operation volt in three zones of on the charge velocity value of this conditioning agent all reaches its peak separately.The difference that occurs between each regional abvolt paricular value in three zones mainly is because the different cause of the condition of control of dust separately in each zone.Because load of dust remove amount and control of dust speed in regional I are the highest, if the therefore limiting value that makes its arcing arcing is under all identical situation of other condition, lower than other regional arcing arcing limiting value of handling low dustiness gas.Because volt is normally on the referred arcing arcing limiting value in interactivity ground.Therefore, if under all identical situation of other condition, then when the dustiness of gas improves, operation volt that just must low deduster.

We find that also when the input current value of maximum changed, the relation curve between operation volt and the conditioning agent charge velocity did not change.The method according to this invention, we always can find an operation volt the highest.By finding this peak, so that flue gas is reached optimization in the adjusting that electric precipitator carries out dedusting, thus used electrostatic precipitator can be operated with the efficient of the best.

Claims

1, make the adjusting of carrying out the flue gas of dedusting in electrostatic precipitator reach method for optimizing, it comprises, injects conditioning agent to flue gas, for example, and SO ₃, NH ₃, or triethylamine, it is characterized in that, change each stage conditioning agent charge velocity M, measure conditioning agent charge velocity M with each stage ₁The current value of the electrostatic precipitator that is associated and/or volt, detected numerical value is compared in the stage that is close to the storage of its data and with the next one, under condition, when again not detecting the increase of volt, just can stop the change of conditioning agent charge velocity at given electric current.

2, according to the described method of claim 1, it is characterized in that, when current value and/or volt change with predetermined minimum of a value, then can restart to change by stages the charge velocity of conditioning agent again.

3, according to the described method of claim 2, it is characterized in that, change each stage that conditioning agent adds speed and be with △ T blanking time separately disconnected mutually each other and connect and work.

According to any one method among the claim 1-3, it is characterized in that 4, the increment of the charge velocity of conditioning agent is △ M.

According to any one method among the claim 1-3, it is characterized in that 5, these two increments of △ T and △ M all are the constants of being scheduled to, △ M is the increment of conditioning agent charge velocity.

According to any one method among the claim 1-3, it is characterized in that 6, these two increments of △ T and △ M all are with the control of electronic calculator coded program, to reach optimization, △ M is the increment of conditioning agent charge velocity.