DE2424432B2 - HORIZONTAL FLOW ELECTRIC SEPARATOR - Google Patents

Description

The invention relates to electrostatic precipitators with a horizontal flow, in particular for flue gas purification.

gen problems of flow distribution and high

¹¹¹ Sf 5S £ S ^{invention g} i * T " ^der ° _h ^berl r ^ ^ng

Ina eDimensioning the electric fields from the fact that the ¹ ^ " _{value of the} electrical power ^ Hrhspaäsiomversorgung is limited. If the HV units exceed a value of STaWOmA, inadmissibly high short-term power occurs with full transmission to

Sen can lead to the plants (for example, ^Si Sprühero- ° Sist therefore required, the electrical power ■ j AUo ^ _P;. Rfpfeldes to keep within certain ^{limits, depending} iTJiTSifEScEiLcteidem.l ^ e frequently in

eTect £ h ^g non-mechanically separated separation fields electnscn ^ ^ _{all the more necessary}

^TO MHe new 'air pollution control regulations, the Einhai-7ung of the S sigen dust litter even when Störfä.len ^"tung .iktroabscheiders demand. It is for example XdeÄ the clean gas dust content of 150 mg / Nm' Sch be a failure Absche.derstraße or Ausfa.l

_n "Separator field not exceeded w.rd. ^ei it to "t beieksbe _ka nnt durchftrömten (according to US Patent 25 88 364) .the" entire flow cross-section e.nes hor.zontal electrostatic precipitator through a special AuSungsform the collecting electrodes and the MeS associated dust collection bags ubere.nanderliegende Te.lquerschn.tte unterteüen m where τ flow through ι / "mensen the parent and one behind the other Ä ^ SSuSeten electron Absche.defe.der Ehzeitig. The shock electrodes are shown here as closed hollow electrodes, which at their upper ends are connected to the dust pockets of the respective separating field and are connected to the dust separated in this separating field

_ r .-. u; "dust collectors who work together for

below the separator housing

Precipitation electrodes and high-voltage spray electrodes with knocking devices and dust f have angtaschen, with the precipitation electrodes clearing in all rows of electrodes below there are closed hollow electrodes at their upper ends are in a dust-tight connection with the dust collection pockets of the respective separation field above and those separated in this separation field

S,: aub lead down, and taking for all clean.nander arranged and rauml.ch separated from each other Separation fields only in a lower level.

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locations to decrease uun-u ί-νΐ · ». ^ .. ^. ^ -

traversed electrostatic precipitators with separate separators

divider fields one above the other and one behind the other and at the same time to keep the order of magnitude and the overall height of each electric field within the most favorable limits in which the The disadvantages described can be avoided, with the division into individual electrical separation fields

should be provided in such a way that if a separator line or a separator field fails permissible dust ejection is not exceeded.

In the electrostatic precipitator system according to the US patent 25 88 364 are for the one behind the other in the gas direction

separate knocking

Separators (e.g. according to OS 14 57 177) are also the separation fields on the upper floors of the Electric separator system equipped with its own dust bunkers, which make up a substantial part of the total Take up the overall height.

The evolution in kettle sizes tended to make the electrostatic precipitators more conventional Design determine the block widths of the system. This fact is given by the fact that an extension of the precipitation plates over about 15 m for electrical, fluidic and assembly reasons Disadvantages associated. In addition to the disadvantage of space requirements, wide separator systems : precautions.

In contrast, the object is achieved according to the present invention in that the spray and Precipitation electrodes as well as the dust collection pockets of each of the arranged one above the other and one behind the other electrical separation fields have separate knocking devices and separate power supplies.

This gives the option of even if one separation field fails or all of the in Electrical separation fields arranged one behind the other in a partial cross section of the electrical separation system (in a so-called filter line), each from a partial gas quantity «; are flowed through that

Power supply and the knocking devices for electrodes and dust bags ip this area switch off and at the same time the separation voltage in the separation fields that are still in operation and the knock periods for this particular operating case in accordance with the specified guaranteed value to be adjusted optimally.

Such a separate power supply for all electrical devices of each separation field as well the arrangement of separate tapping devices for electrodes and dust bags has been implemented in the contrary to held US patents 25 88 364 and 26 26 676 not disclosed - also the German Patents 3 64 808 and 4 63 717 as well as DT-Gbm 18 91 442 do not show such arrangements

Another embodiment of the invention relates to large systems in which 2 air preheaters, 2 Induced drafts and 2 fresh fans are provided. In this case z. B. in a two-story electrostatic precipitator the flue gases that come from one air preheater through the electrical separation fields the lower floor is led to an induced draft and in the upper EtP.ge of the electrostatic precipitator the Flue gases from the other air preheater in the opposite direction. In this way, the Bunker dust load is more evenly distributed, because with two-field electrostatic precipitators fall in the first field about 90% and in the second field about 10% of the dust the end. The bunker capacity of the second field is therefore not used optimally with normal construction, while due to the opposite guidance of the flue gases through the electrical fields of the upper floor according to the invention, a more uniform load on the dust discharge devices can be achieved.

The discharge of the separated dust from the electrical separators on the upper floor through the hollow electrodes of the fields arranged underneath is caused by the periodic vibration or Knocking the dust bags and precipitation electrodes supported. The dimensioning of the conveying cross-section the hollow electrodes and the profiling of these electrodes can affect the residual charge of the dust be coordinated. In addition, there is the possibility of insulating the inner surfaces of the hollow electrodes or to make them dust-repellent through appropriate treatment or surface coatings made of insulating or dust-repellent materials (e.g. Teflon).

An embodiment of the invention is shown schematically in the drawings.

It shows

Fig. 1 is an elevation cross-section through a two-story, horizontal flow electrostatic precipitator,

Fig. 2 is a side view of a two-storey electrostatic precipitator ^ the upper storey fields in the Flow countercurrent to the gas direction in the lower separation fields.

In A b b. 1 is the top separation field with the usual spray and precipitation electrodes 1 and 2 equipped

The separator housing 3 is due to the arrangement of the dust chutes at the lower end of the upper Separation field divided into separate flow cross-sections. If necessary, the upper and Lower separation fields are traversed by partial amounts of smoke gas in the opposite direction thus to achieve a more even bunker dust load.

The Kiopf- or vibrating devices of the upper separation field, which normally cause the vibration the knocking linkage 5 can shake the dust chute 4 at the same time. These dust chutes 4 can be kept movable within certain limits for this purpose.

The hollow electrodes 7 of the lower field can be vibrated by knocking devices which ai «f the lower knocking rods 5a act or by knocking and shaking devices with which the suspension supports 6 of the hollow electrodes are shaken.

For the collection and removal of the excreted dust from the two electrical ones arranged one above the other The lower dust collection bunker 8 is used for separation fields.

Fig. 2 shows schematically and as an example the application of the upper separation fields of the two-story Electrostatic precipitator in countercurrent.

The advantages achieved by the invention are in particular that the space required is greater Electrostatic precipitator systems are reduced by at least half in the floor plan width and this at the same time made possible by a multiple subdivision into mechanically and electrically separated separation fields becomes, the electrical power of the high-voltage supply units and the separation power for to set each separate separation field to a most favorable maximum value.

The space-saving design of the electrostatic precipitator allows the entire electrostatic precipitator system to be dimensioned sufficiently large that in the event of failure of a separator line or a separator field the Compliance with the permissible dust emission can be guaranteed.

For this purpose 2 sheets of drawings

Claims (2)

Patent claims: 1. Electrostatic precipitator flows through horizontally, especially for flue gas cleaning mitvon Partial amounts of gas flowed through one another and one behind the other and parallel “d-to” ** £ see separation fields whose electrical separation de-facilities parallel rows of grounded Precipitation electrodes and high-voltage spray electrodes with knocking devices and Have dust pockets, the collecting electrodes in all underlying electrode rows closed hollow electrodes are dust-tight at their upper ends with the dust-collecting pockets of the respective Abscheidefewes above are connected and in this Abscneidefeld excreted dust lead down, and being for all stacked and Spatially separate separators only in a lower level common dust collecting funnel are provided, d a d u r c h g e k e η η ζ e i c h η e t. that the spray and precipitation electrodes (1; 2) as well as the dust pockets of each of the electrical ones arranged one above the other and one behind the other Separation fields have separate knocking devices and separate power supplies. 2. Electrical separator according to claim L, characterized in that the electrical separation fields the upper and lower floors in opposite directions from the smoke gases are flowed through.