US1997729A - Electrical precipitator - Google Patents

Description

April -16, 1935. p. HERBER ELECTRICAL PRECIPITTOL Filed April 1954 2 Sheets-Shee' 2 ame/WM Patented Apr. 16, 1935 PATENT OFFICE V mames ELECTRICAL PRECIPITATOR.

Pierre Berber, Middlesex Borough, N. J., assignor to Research Corporation, New York, N. Y., a corporation of New York Application April 11, 1934, Serial No. %30,114

'14 Claims.

phosphoric acid, for example.

An object of the invention is to provide an electrical precipitator suitable for the treatment of gases containing highly corrosive substances.

A further object of the invention is to provide an acid-proo precipitator of simple Construction involving the use of a minimum of expensive acid-resistant materials.

other objects and advantages of the invention will appear from the following description.

It has been found that in the construction or' electrical precipitators oi the Cottrell type for the treatment of gases containing Corrosive substances that it is highly desirable to construct the parts of the'precipitator coming in contact with the corrosive substances of acid-resistant materials. For example, in the treatment of gases containing phosphoric acid it is advantageous to use carbon members for the parts'of the precipitator coming in contact with the phosphoric acid or phosphoric acid-containing gases which are required` to be conductive. Other nonmetallic conductive or semi-conductive materials, for example, materials comprising a. mixture of acid-resistant ceramic substances and carbon, may also be used to advantage.

A difficulty in the use of such materials arises in providing for the proper support 'of the ceiling of the chamber in which the precipitation is effected. The use of metallic supporting members is subject to the disadvantage thatthey are subjected to the corrosive eifect of the acid substances. The use of beams or other supporting members of carbon or other non-metallic material is impracticable because of the high cost of such members and their low strength.

It has now been found that an economic and satisfactory structure may be produced by supporting the corrosion-resistant collecting electrode members outside the precipitating chamber and supporting the members forming the' ceiling of the precipitating chamber upon the collecting electrode members.

The invention will be more particularly described for the purpose of illustration with reference to the accompanying drawings, in which:

Fig. 1 'is a vertical section through a precipitator embodying one form of the invention;

Fig. 2 is a horizontal section online 2-2 of Fig. 1;

Fig. 3 is anpassembly of a collecting electrode member and associated supporting 'members and ceiling members, in partial section;

Fig. 4 is a detail showing the Construction of the top support of the collecting electrode members;

Fig. 5 is a plan view o! a split collar forming part 'of the invention;

Fig. 6 is a section on line 6--6 of Fig. 5 and Fig. 7 is a. detail of a modified embodiment oi the invention.

Referring'particularly to Figs., 1 and 2, l is a precipitating'chamber .having walls and floor of acid-proof brick, gas inlet 2 and d'ain outlet !6. Cylindrical collecting electrodes 3 made oi carbon are vertically positioned in the upper part of the chamber and discharge electrode 4 is Suspended in each collecting electrode. The discharge electrodes are' Suspended from a conductive beam 5 supported upon insulators 6 positioned in insulator hoods 1. The discharge electrodes are maintained taut by porcelain weights 8, and are centered in the collecting electrodes by members 9.

The collecting electrodes are supported at the top on split carbon collars o (Figs. 3-6) 'which are supported in turn by 'beam members H (Fig.- 4).. The collar members are positioned in grooves somewhat below the top of the electrodes and the space above the collars is filled with cement mortar l2`to the level 'of the tops of the electrodes. To provide adequate grounding of the i collecting electrodes a sheet of lead !3 is dressed over the rounded upper inside edges of theelectrodes.

The chamber ceiling is iormed by split carbon collars !na similar to collars ill which are supported by the collecting electrodes in grooves M. The collars loa cooperate with the collecting electrodes to form a ceiling for the precipitator chamber which requires .no other supporting means; A fiexible acid-proof plastic material IE is placed in the joints oi collars wa. or spread over the top of the collars Ilia, eifectively scaling all of the joints.

A modified form of the invention is shown in Fig. 7. In this form the collecting electrode member consists of an upper section Ba and a lower section 3b, fltting together with a screw joint which is formed to 'leave groove Ma at the level of the precipitator chamber root. In this embodiment, the roo of the chamber is formed of one-piece collars lub which are slipped over the tops of the lower electrode sections :b before the upper sections sa are joined thereto. In this way the root may be erected and the plastic sealing material !5 placed in the joints r before the upper sections of the electrodes are put in place.

In either of the forms of the invention described above, the collar members may be an integral part of the collecting electrodes. A

It will be seen that the invention provides a simple and economical Construction for electrical precipitators treating corrosive gases and gases containing con-osive materials.

I claim:

1. In an electrical precipitator, a. chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported non-metallic acid-resistant collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and non-metallic acid-resisting members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.`

2. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported non-.metallic acid-resistant conductive collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and non-metallic acid-resisting members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

3. In an electrical precipitator, a chamber provided With an opening for admitting into said chamber gases containing Suspended matter, ex-

ternally supported non-metallic acid-resistant semi-conductive collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and non-metallic acidresisting members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

4. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported carbon collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and non-metallic acid-resisting members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

5. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported carbon collecting electrode members projecting vertically upwards from said chamber and dening conduits for the passage of gases out; of said chamber, and carbon members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

6. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, extemally supported non-metallic acid-resistant cylindrical collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber and non-metallic acid-resisting members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

7. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported non-metallic acid-resistant cylindrical collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and non-metallic acid-resisting collar members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

8. In an electrical preclpitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, externally supported carbon cylindrical collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and carbon collar members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

9. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gases containing Suspended matter, eX- ternally supported carbon cylindrical collecting electrode members projecting vertically upwards from said chamber and defining conduits for the passage of gases out of said chamber, and carbon split collar members supported by said collecting electrode members and cooperating to define a ceiling of said chamber.

10. In an electrical precipitator, a chamber provided with an opening for admitting into said chamber gasescontaining Suspended matter, vertical. cylindrical carbon collecting electrodes comprising an upper section supported outside said chamber, a lower section joined thereto at the level of the ceiling of said chamber, carbon collar members supported at said joint and cooperating to form the ceiling of said chamber.

11. An electrical treater for removing suspended particles from gases comprising vertical flues of non-metallic acid-resisting material, discharge electrodes positioned in said flues, a'

chamber communicating with the lower end oi said flues, means for passing gases into said chamber, a ceiling for said chamber comprising horizontal members supported by said flues on the outside thereof, and means for impressing an electrical potential between said discharge electrodes and said flues.

12. An electrical treater for removing Suspended particles from gases comprising vertical flues of carbon, discharge electrodes positioned in said flues, a chamber communicating with the lower end of said flues, means for passing gases into said chamber, a ceiling for said chamber comprising horizontal members supported by said flues on the outside thereof, and means for impressing an electrical potential between said discharge electrodes and said flues.

13. An electrical treater for removing Suspended particles from gases comprising vertical flues of carbon, discharge electrodes positioned in said flues, a chamber communicating with the lower end of said flues, means for passing gases into said chamber, a ceiling for said chamber comprising horizontal carbon members supported by said flues on the outside thereof, and means for impressing an electricalpotential between said discharge electrodes and' said flues.

14. An electrical treater for removing Suspended particles from gases comprising vertical flues of non-metallic acid-resisting material, discharge electrodes positioned in said flues, a chamber communicating with the lower end of said flues, means for passing gases into said chamber, a ceiling for said chamber comprising horizontal members supported by said flues on the outside thereof and joined together by a fiexible sealing material. and means for impressing an electrical potential between said discharge electrodes and said flues.

PIERRE HERBER.

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