US1929093A - Ash quencher - Google Patents

Description

0a. 3, 1933. FRY I 1,929,093

ASH QUENCHER Filed April 10, 1930 2 Sheets-Sheet 1 Wall Oct. 3, 1933. J. J. FRY 1,929,093

ASH QUENCHER Filed April 10, 1930 2 ShQets -Shut 2 gwuentoz Patented Oct. 3, 1933 sa QUENCHER john J. 'Fry, Roxborough, Pa., assignor to The Allen-Sherman-Hoff Company, a corporation of- Pennsylvania Application April 10, 1930. Serial No. 443,066 H 9 Claims. (01. 110-171 This invention relates to the 'art of ash hoppers and furnace bottoms of "fuel'burning furnaces and more particularly to the constructio of certain parts of such devices. i

It is common practice in 'powdered-fuel-burm ingfurnace construction to provide a combustion chamber, with a refractory lining, the bottom wall having a discharge opening for the escape of slag, ashes and other incombustible residues and ordinarily referred to as a furnace bottom. Itis also common practice in stoker fired furnaces to provide an ash hopper having upstanding sides, refractory lined, for receiving ashes from the furnace. The temperature of the ash and slag passing through the bottom opening of the furnace is very high, portions of the material frequently being in a molten state.

It is desirable to cool the ash and slag which pass through the furnace bottom, at least to a certain degree, before allowingit to enter the conveying mechanism which carries it to a place of disposal. In stoker fired furnaces, metallic lining has been provided immediately adjacent the opening in the bottom of the furnace. Such linings serve to assist in the support of the refractory brick or the like, which line the furnace bottom and also provide a wear-resisting rim or nose portion for the discharge opening of the furnace. A lining of this general type is disclosed in the co-pending application of combined the metal lining for the discharge opening of the furnace bottom and a spray nozzle 7 in an integral structure. This simplifies the furnace construction and provides an efficient and economical ash cooling means and furnace discharge opening lining.

One object of my invention is to provide a' sec-- tional water-cooled lining for bottom openings of furnaces andthe like, having integral spray nozzles, in which the water which cools the casting is sprayed out through the nozzles and serves to cool the combustion residues passing through the discharge' 'opening in the furnace bottom.

sion of a nose or margin casting for furnace bot- A further object of my invention is the provi-' toms which will serve to cool'the molten material which passes over it and further cool the material by spraying water directly into it as it drops into the ash hopper.

Other objects of my invention will appear from the following description of a preferred form thereof, reference being had to the accompanying drawings in which:

Fig. 1 is a vertical section through a furnace bottom showing my improved nose construction; Fig. 2 is a fragmentary plan view taken-on 1ine'2--2 of Fig. 1 showing one of the metal block units together with its cooling-water connections; the adjacent supporting structure being omitted; Fig. 3 is a section taken on line 3-3 of Fig; 2; Fig. 4 is an enlarged sectional view taken on line 4-4 of Fig. 2; a Fig. 5 is a section taken on line 55 of Fig. 4.- The furnace bottom illustrated in Fig. 1 of the drawings has inwardly'converging walls lined 7 with a refractory material such as the fire brick 1. These walls are supported by a suitable external supporting structure and the lower row of firebrick rest on, and are supported by, the metallic angle members 2.

My improved cast nose or margin blocks are located immediately below the bottom row of firebrick. In the application of my invention illustrated in the drawings the blocks define the mouth of the bottom opening of the furnace.

The space between the bottom row of firebrick and the upper wall of the cooling chambers of the nose blocks 3 is preferably filled with a high temperature resisting cement 4 so that there will be a continuous and smooth surface for the prod-' ucts of combustion to pass over as theyare discharged from the furnace.

The margin castings 3'are held in position on the supporting structure bythe bolts 5. Immediately below the bottom opening of the furnace is an ash hopper 6, which may be of anydesiredj and suitable form. The hopper illustrated inthe drawings has vertical side walls which are lined with refractory material to provide a resisting and renewable surface. I

The inner walls 7 of my nose castings,; over which the hot products of combustion pass, are

preferably curved as shown to facilitate the discharge of the material. These inner walls '7 form one side of the longitudinally extending water chambers 8 of the nose castings.

As seen in Figs. land 2, the metallic rim or nose of the furnace bottom opening is preferably made in blocks or sections which are adapted to r be assembled to define the opening in the bottom heat of the furnace. Each block is an independent unit and as they are substantially alike, a-description of one will suflice.

The base 9 of each block extends rearwardly from the cooling-fluid chamber 8 and is provided with holes adjacent its rear edge, for-thenozzle 16 from the direct abrasive action of the material which is being discharged through the opening.

The water chamber 8 is connected by pipes 13 to the main water supply pipe 14; These pipes 13 enter the water chamber 8 through. suitable openings in the. rear verticle wall 15 0f the chamber 8.

In the type of apparatus illustrated in the draw ings a single spray nozzle is, provided in each unit of the furnace nose; Any desired number of spray nozzlesmay, however, be provided in each In order to procure a whirling spray of water from the spray nozzle 16 and to maintain the proper water level inchamber 8, the auxiliary chamber -1'l is provided within the main water chamber 8. This chamber 1'7 is connected to the chamber 8' by a pipe member 18 which has a passageway openinglinto the main water chamber 8 adjacent its top walland entering the auxiliary'chamber 17 at one side.

By having .the openingof the pipe member '3 l8 near the top of 'the water chamber 8, the.

level of the water inthe chamber 8 will always remain high enough to prevent overheating cf the casting and consequent burning of the metal. By locating this pipe member 18 on one side of i the chamber 17, the water which enters this chamber will be given a whirling movement and will pass out-of the nozzle 16' in the desired whirling spray form. A clean-out hole for. the chamber l'lis normallyclosed by a plug19, best seen in Fig. 4. If dirt or sediment collect in the chamber 1'7, it is only-necessary to remove the plug 19, providing easy access to the chamber 17:

from the outside of the furnace. The construction of the 1 spray-chamber 1'7 and the inlet pipe member 18 is similar tothat disclosed in U. S. Patent No. 1,496,402 .to F. B. Allen. 7

When my improved nose castings are in posi tion to form the mouth of the opening in the bottom of thefurnace and are connected to a supply, .of cooling water, this cooling water enters the chamber 8 through the pipes 13. The water rises in the chamber 8 until it is above the top of the opening in the pipe member 18. It then flows through this pipe member 18 into the chamber 17 where it is given a whirling movement and is discharged through the small hole 20 in the nozzle 16. The pressure of the water and the size of the pipes 13 will be made sufficiently large, in proportion to the size ofthe openings 20 in l the nozzles 16, to cause the chambers 8 to be always filled with cooling water.

- Thus it will be seen that the cooling water enters thechambers 8, serves to'coolthe hollow blocks and particularly their inner walls 7, and then passes out through the spray. nozzles -16 which strengthening are not'necessarily locatedat the mouth of the direct the water into the hot ash and slag as they pass through the opening in the furnace bottom.

The water cooling of the castings positively prevents them from being burned out and. also serves to cool the molten slag which runs over their surfaces. The sprays of water issuing from the nozzle 16 are directed out into the path of the falling combustion residues and serve to thoroughly cool them before they enter into the conveyor or other removing means.

The water-cooled metal blocks 3 form in effect a part of the lining of the furnace bottom. They discharge. opening but may be inserted in the refractorylining at any desired and suitable point.

While I have described the illustrated embodiment of my invention in some detail, modifications andvarlations thereof may occur to those skilled in the art to which this appertains and I do not therefore, limit myself to the precise details shown and described but claim as my inventionall embodiments thereof coming within the scope of the appended claims.

, I claim:' I

l. A furnace bottom having an ash discharge opening, an ash hopperbelow said opening, a metallic margin member defining said opening, said margin member having a cooling-water chamber and an auxiliary water chamber within said cooling water chamber, a conduit within said margin member extending from a point above the bottom of said cooling water chamber into said auxiliary water chamber, a spray nozzle in the wall of saidauxiliary chamber having an aperture positioned to direct a spray of water from said auxiliary chamber into said ash hopper, and means for connecting a source of supply of water, to said cooling water chamber.

2. A furnace bottom having a discharge opening, an ash hopper below said opening, a plurality of metal blocks having cooling-watr chambers disposed around said opening, means for connect ng a source of supply of cooling-water to said cooling chambers, auxiliary water chambers ter chambers, fluid conducting conduits connecting the cool ng water chambers and the auxiliary water chambers, and spray nozzles in' the walls of said blocks adapted to spray water from said auxiliary chambers.

4. A furnace bottom having a discharge open-' ing, a plurality of metal margin units having cooling water chambers disposed around said opening, means for connecting a source-of supply of cooling waterto saidcooling-water chambers,

auxiliary water chambers within said cooling water chambers 'fiuid conducting passages between said auxiliary chambers and said cooling-water chambers,'andspray'nozzles in the walls of said auxiliary chamber positioned to spray water from said auxiliary chambers into the path of material passing through said-discharge opening.

5. In a furnace having an ash discharge opening, a lining for the mouth of saidopening comprising a casting having a cooling-water'chamber, an auxiliary water chamber lying within said cooling-water chamber, a pipe leading from said cooling-water chamber to said auxiliary chamber, and a spray nomle having an aperture through which water may be discharged from said auxiliary chamber into the path of material passing through said furnace bottom opening.

6. A hollow margin block for furnace bottom openings, including walls defining a cooling water chamber, walls defining an auxiliary chamber within said cooling water chamber and a pipe connecting said chambers, said pipe having its opening into said cooling water chamber disposed above the bottom thereof.

7. A margin block of the class described including walls defining a main cooling water chamber and an auxiliary water chamber, said auxiliary chamber having av water discharge outlet, and a fluid conducting conduit extending between said main and auxiliary chamber, said conduit having its opening into said main cham ber disposed above the bottom thereof.

8. A furnace bottom having a discharge opening, an ash hopper below said opening, a plurality of hollow water cooled metal blocks disposed around said opening, means outside of said furnace bottom and ash hopper for connecting a source of supply of cooling water to said metal blocks, each of said blocks having a cooling water chamber and an auxiliary water chamber within said cooling water chamber, conduits within said hollow blocks extending from a point above the bottoms of said cooling water chambers into said auxiliary chambers and spray nozzles in the wall of said auxiliary chambers positioned to spray water therefrom into said ash hopper.

9. In combination with a furnace bottom having a discharge opening and an ash hopper below said opening, a metal margin block for said opening having a cooling water chamber, means for connecting a source of supply of cooling water to said cooling water chamber, an auxiliary chamber within said cool ng water chamber, means permitting water to enter said auxiliary chamber from said cooling water chamber and for producing a whirling motion of the water with:- in said auxil ary chamber, and a spray nozzle opening out of said auxiliary chamber.

JOHN J. FRY.

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