US3228362A - Radiation screen - Google Patents
Radiation screen Download PDFInfo
- Publication number
- US3228362A US3228362A US334265A US33426563A US3228362A US 3228362 A US3228362 A US 3228362A US 334265 A US334265 A US 334265A US 33426563 A US33426563 A US 33426563A US 3228362 A US3228362 A US 3228362A
- Authority
- US
- United States
- Prior art keywords
- receptacle
- shield
- hopper
- water
- screen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/002—Ash and slag handling in pulverulent fuel furnaces
Definitions
- This invention relates to a heat shield and more particularly to a heat and splash shield for a sealed ash receptacle for a vapor generator furnace.
- An object of this invention is an improved durable shield.
- a further object is a shield which will absorb sudden local rapid temperature changes without serious deterioration.
- FIG. 1 is an end view, partly in section, of the shield formin the invention mounted on the ash hopper structure of a furnace and extending into an ash receptacle;
- FIG. 2 is an enlarged end view of the shield and its support
- FIG. 3 is a side View of the shield showing a plurality of expansion joints
- FIG. 4 is a section through an expansion joint
- FIG. 5 is a section through a corner expansion joint.
- the combustion space in which fuel is burned may be defined by parallel, vertically extending water filled tubes forming what is known as furnace Walls and forming the side walls of the furnace.
- the tubes indicated as 1!) in FIG. 1 are inwardly inclined towards each other from the opposite sides of the furnace as at 12 to form a trough 14 extending across the bottom of the furnace or combustion space and terminating in a discharge or opening 16 where the tubes are bent outwardly as at 18 and lead into headers 29.
- Each tube is Welded to the adjacent tube or other means provided to provide an air tight casing for the combustion chamber and the hopper 14.
- an ash receptacle 22 Arranged beneath the opening 16 of the hopper 1 is an ash receptacle 22 having an open top 24 for receiving ash, slag, or scale discharge from the combustion chamber through the hopper 14.
- the ash receptacle 22 may be of any suitable materials such as concrete lined with refractory material and is provided with an opening 24 at the bottom thereof for discharge of material collected in the receptacle.
- the opening 24 may be closed by any suitable means, not shown, for retaining Water 25 in the receptacle and may be removed to permit washing of the material out of the receptacle.
- the water 26 in the receptacle serves the purpose of protecting the receptacle from radiation and cooling the ash that is discharged through the discharge 16 and the hopper 14.
- the water also serves the purpose of cooling and breaking up slag and scale that may drop into the hopper 14 and through the opening 16. This slag and scale may come down in large chunks and sometimes from great heights such as one hundred feet or more and passing through the opening 16 will cause the water to splash.
- the combustion space in the furnace and the hopper 14 may be under pressure such as say 16 inches of water during operation of the furnace and as the hopper opens directly into the receptacle 22 it is necessary to seal the receptacle in order to avoid loss of this pressure.
- the sealing plates ice 32 which are welded in air-tight relation to the tubes 18 dipping into the water 31) in the containers 28 which are arranged in air tight relation around the exterior of the receptacle 22 provide such a seal.
- the opening or discharge orifice 16 of the hopper 14 exposes structure below the opening 16 to radiation from the combustion chamber.
- a shield 34 is suspended from the tubes 18 and surrounds the orifice 16.
- the shield 34 is arranged around the interior of the receptacle 22 and adjacent the walls thereof. Due to the range of temperature variation from cold to operating temperature, which may be 700 or more, and because the vapor generators are usually suspended on a framework from overhead, the bottom of the generator including the hopper l4 and the tubes 18 may move downwardly as much as ten inches from the cold to the hot condition.
- the shield 34 is therefore suspended from the tubes 18 so that it may slide freely into the open end 24 of the receptacle 22 as the vapor generator expands. Similarly the shields 32 may move freely downward in the container or trough 28 during this expansion.
- the shields 34 may become quite hot, and may even become red hot, from the radiation through the opening 16 and particularly at the ends of the hopper trough 14. Slag falling through the hopper 14 and splashing into the water 26 will splash water onto the red hot shield. This alternate intermittent and repeated heating and sudden cooling is a very severe service and tends to rapid deterioration of the shield 34. Previous shields formed of Meehanite castings lined with refractory material have warped and deteriorated and Incoloy plates also failed after short periods of service.
- These shields serve the dual purpose of acting as a radiation shield to prevent the refractory material of the ash receptacle 22 and also the material of the seal plates 32 from becoming unduly heated and also serve the purpose of a splash shield for preventing any surfaces of the receptacle 22 or the seal plates 32 that may be heated from being splashed with water thrown about by slag dropping into the water pool 26.
- These shields 34 also act as dust shields preventing an undue amount of ash dust being carried over into the container 28 and settling in the water 30 from where it has to be eventually removed.
- the screen of applicants invention which comprises a wire screen of suitable material such as stainless steel type 430 of say inch rods woven or welded to form a wire screen or cloth with say A to /2 inch openings.
- the Wire screen 36 which may be cut into suitable lengths to provide adequate expansion joints is folded upon itself at 38 so as to provide a trough 40.
- the upper ends 42 of the screen 36 at the upper end of the trough are brought close together on opposite sides of a plate or tabs 44 welded to the longitudinally extending portions 18 of the boiler tubes and are secured to the plate 44.
- This permeable screen because of its double thickness and the comparatively small mesh openings will also act as an adequate dust shield for the water trough 28.
- This pervious wire screen or cloth because of its flexible nature and the open mesh construction will absorb localized stresses caused by the water splashing onto the hot screen and at the same time maintain the temperature of the refractory wall of the receptacle 22 and the seal plates 32 at a low temperature level such that if they were splashed by water no severe damage would result.
- the shield is generally rectangular in shape as it surrounds the discharge of the elongated hopper 14 and provision is made for an expansion joint at the corners of the shield by ending the individual sections of the shield short of the corners and then forming the corner of the shield by bending a separate piece or filler strip 52 to form the corner and inserting the opposite legs of the angularly bent piece 52 into the troughs of the respective adjacent shield lengths at the corner.
- One leg of the member 52 may be secured in one shield by the bolt 54 and allowed to slide in the trough of the adjacent shield so that expansion may be taken up by the sliding movement and distortion of the corner filler piece 52.
- walls forming a water-containing ash receptacle, an ash hopper having a discharge opening discharging into said receptacle, an open mesh wire screen with openings hanging from said hopper structure adjacent the walls of said receptacle and extending into said receptacle an appreciable distance along said walls, pressure sealing means outside of said receptacle for sealing said receptacle and hopper, said screen located between said sealing means and said hopper discharge.
- a shield as claimed in claim 1 comprising a wire screen folded on itself to provide a trough having a closed side and an open side, means connecting said open side to said hopper structure.
- a shield as claimed in claim 2 in which the shield is made up of several lengths of wire screen joined together by expansion joints, said joints comprising a layer of wire cloth located in said trough and fastened to one length and free to move in an adjacent length.
- a shield as claimed in claim 3 in which adjacent lengths of said shield are arranged at an angle and joined to each other by an expansion joint to form a corner, said corner comprising a layer of wire screen bent to form an angle with two legs, one leg located, and fastened, in the trough of one length and the other leg located in and free to move in the adjacent length.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gasification And Melting Of Waste (AREA)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DENDAT1252840D DE1252840B (de) | 1963-12-30 | ||
US334265A US3228362A (en) | 1963-12-30 | 1963-12-30 | Radiation screen |
GB51456/64A GB1036650A (en) | 1963-12-30 | 1964-12-17 | Heat and splash shields for ash receptacles |
NL6414896A NL6414896A (de) | 1963-12-30 | 1964-12-21 | |
BE657420D BE657420A (de) | 1963-12-30 | 1964-12-21 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US334265A US3228362A (en) | 1963-12-30 | 1963-12-30 | Radiation screen |
Publications (1)
Publication Number | Publication Date |
---|---|
US3228362A true US3228362A (en) | 1966-01-11 |
Family
ID=23306403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US334265A Expired - Lifetime US3228362A (en) | 1963-12-30 | 1963-12-30 | Radiation screen |
Country Status (5)
Country | Link |
---|---|
US (1) | US3228362A (de) |
BE (1) | BE657420A (de) |
DE (1) | DE1252840B (de) |
GB (1) | GB1036650A (de) |
NL (1) | NL6414896A (de) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3440978A (en) * | 1967-04-27 | 1969-04-29 | Foster Wheeler Corp | Corrugated furnace seal |
US3857344A (en) * | 1973-10-09 | 1974-12-31 | Babcock & Wilcox Co | Furnace seal |
EP0023243A1 (de) * | 1979-07-27 | 1981-02-04 | Combustion Engineering, Inc. | Vorrichtung und Verfahren zur Beseitigung von Rückständen aus der Mahlanlage eines kohlegeheizten Dampferzeugers |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2830372C2 (de) * | 1978-07-11 | 1986-11-20 | Deutsche Babcock Ag, 4200 Oberhausen | Eintauchstück für den Aschetrichter eines Feuerungsraumes |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2275652A (en) * | 1940-07-05 | 1942-03-10 | Allen Sherman Hoff Co | Furnace seal |
US2337634A (en) * | 1942-01-02 | 1943-12-28 | Allen Sherman Hoff Co | Water sealed expansion joint |
US3094953A (en) * | 1961-10-27 | 1963-06-25 | Edwin S Alexander | Boiler furnace ash hopper seal |
-
0
- DE DENDAT1252840D patent/DE1252840B/de active Pending
-
1963
- 1963-12-30 US US334265A patent/US3228362A/en not_active Expired - Lifetime
-
1964
- 1964-12-17 GB GB51456/64A patent/GB1036650A/en not_active Expired
- 1964-12-21 NL NL6414896A patent/NL6414896A/xx unknown
- 1964-12-21 BE BE657420D patent/BE657420A/xx unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2275652A (en) * | 1940-07-05 | 1942-03-10 | Allen Sherman Hoff Co | Furnace seal |
US2337634A (en) * | 1942-01-02 | 1943-12-28 | Allen Sherman Hoff Co | Water sealed expansion joint |
US3094953A (en) * | 1961-10-27 | 1963-06-25 | Edwin S Alexander | Boiler furnace ash hopper seal |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3440978A (en) * | 1967-04-27 | 1969-04-29 | Foster Wheeler Corp | Corrugated furnace seal |
US3857344A (en) * | 1973-10-09 | 1974-12-31 | Babcock & Wilcox Co | Furnace seal |
EP0023243A1 (de) * | 1979-07-27 | 1981-02-04 | Combustion Engineering, Inc. | Vorrichtung und Verfahren zur Beseitigung von Rückständen aus der Mahlanlage eines kohlegeheizten Dampferzeugers |
Also Published As
Publication number | Publication date |
---|---|
GB1036650A (en) | 1966-07-20 |
DE1252840B (de) | |
NL6414896A (de) | 1965-07-01 |
BE657420A (de) | 1965-06-21 |
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