US2152808A

US2152808A - Furnace port construction

Info

Publication number: US2152808A
Application number: US193958A
Authority: US
Inventors: Karl G Kutchka
Original assignee: Pittsburgh Plate Glass Co
Current assignee: PPG Industries Inc
Priority date: 1938-03-04
Filing date: 1938-03-04
Publication date: 1939-04-04
Anticipated expiration: 1956-04-04

Description

April 4, 1939. K. G. KUTCHKA `2,152,808

FURNACE PORT CONSTRUCTION Filed Macn 4, 1938 sheets-sheet l BY @y RNEY S.

April 4, 1939. K, G KUTCHKA n 2,152,808 I FURNACE PORT CONS TRUCTION Filed March 4, 1938 2 sheets-sham 2 INVENTOR. KHQL G'. Ku v'c Hkn A R EYS.

Patented Apr. 4, 1939 PATENT OFFICE y 2,152,808 o FURNACE roaT CONSTRUCTION Karl G. Kutchka, Wilkinsburg, Pa., asslgnor to Pittsburgh Plate Glass Company, Allegheny County, Pa., a corporation of Pennsylvania Application March 4, 1938, Serial No. 193,958

8 Claims.

l *The invention4 relates to a furnace port construction and particularly to the means for supplying gas thereto for giving the proper mixture with the heated 'air flowing through the port from the regenerators. The present practice inclines toward the use of wider ports and considerable diiiiculty is encountered in securing a thorough distribution of the combustible gas throughout the relatively large cross section of air flowing through the ports. The failure to secure a complete mixture results in poor combustion in the furnace even though the relative proportions of gas and air supplied are theoretically correct.

vThe present invention has for one of its prin-l cipal objects the provision of a port and burner construction which will insure a very complete mixture of the gas and air with wide port openings which may range in width (horizontally) up to six feet, and thus insure a more elcient combustion in the furnace. A further object is the provision of a simple construction suitable for standard installations in which combustion will begin at or close to the port opening rather than back of the port opening ashas been proposed heretofore in attempts which have been made to secure the same end result of a complete mixture of gas and air, since combustion in the port passage remote from the outlet end results in heat losses and reduces the life of the ue walls which are thus overheated. One embodiment of the invention as applied to a glass tank or furnace is illustrated in the accompanying drawings, wherein:

Figure 1 is a vertical section through one side of the tank or furnace equipped with the improved apparatus. Fig. 2 is a horizontal section on the line II--II of Fig. 1. And Fig. 3 is an end elevation of the port opening showing diagrammatically the distribution of the combustible gas therein as provided by my apparatus.

Referring to the drawings, 4 is the melting end of a glass tank, and. 5 is one of the port openings leading through the side wall of the tank. It will be understood that the other side of the tank involves a similar construction and that there are a number of port openings similar to the opening 4 on each side of the tank. Two sets of checkerwork chambers 6 and 'I are provided on each side of the tank, in which the air to be delivered to the tank'is preheated. The passages 8 and 9 lead upward from the checker chambers and discharge horizontally through the passages I 0 and Il, such passagesbeing separated by a partition wall I 2, which terminates about three feet short of the port opening 5. 'Ihe top Wall I3 of the passagewayy forward of the division wall is inclined downwardly, as indicated in Fig. 1, to direct the mixture of air and gas flowing through the passageway downward toward the surface of the material in the tank, which in this instance, 5' is glass. This expedient is' one which is known in the art and increases the efliclency of the apparatus. The side walls I4, I4 of the passageway are preferably inclined toward each other from the port opening 5 back so that the volume of 10 gas and air is spread out laterally due to the port opening being of greater width than height,

as indicated in Fig. 3. As heretofore pointed out, the present practice tends toward the use of wide ports which may range in horizontal dimension 15 as much as six feet.

The method of supplying the combustible gas to the passageway to the rear of the port opening 5 will be seen by reference to Figs. 1 and 2. As here shown, the side walls of the passageway 20 are provided with two pairs of gas passages I5,

I5 and I6, I6, through which gas is supplied from the pipes I'I, I1 and I8, I8. The pair of passages I5, I5 are adjacent the port opening 5 and the bottom of the passageway, while the passages I6, 25 I6 are located at the end of the division wall I2,

so that the gas which flows through these passages is supplied. to the body of air owing through the passageway intermediate 'the two layers flowing through the passages I0 and II. 30 Both sets of gas passages I5, I5 and I6, I6 are directed at an angle transverse to the longitudinal center line of the passageway and also toward the port opening, the angle of the passages I5, I5 with respect to the line of flow being more acute 35 than the angle of the passages I6, I 6 with respect to such line of ow. As a result the gas supplied through the passages I 5, I5 is distributed through the port opening, as indicated in the shaded portions of the drawing marked A, A, in Figs. 2 and 40 3, such areas being the ones along the sides of the passageway. The gas passing through the passages I6, I6 is directed to the center of the body of air owing through the passageway, as indicated by the shaded areas marked B, B, ,in 45 Figs. 2 and 3, so that the central portion of the body of air receives its supply of gas from the passages I6, I6. `The location of the passages I6,

I 6 and their angle with respect to the line of flow contribute to the distribution of the gas to the '50 central portion of the body of air owing through the port, but in addition, this tendency towards central distribution may beincreased by supplying gas through the pipes I8, I8 at a higher pressure than that supplied through the pipes I1, I'I. It 55 will be seen that by the foregoing arrangement, provisionis made for distributing gas effectively throughout the entire width of the port area even. though such area is relatively wide in a horizontal direction, and that there are no portions of the cross section which are not supplied with gas. As a result, a very thorough distribution of gas and air occurs, and a consequent high emciency is secured in the combustion which subsequently occurs. The low pressure ywhich is preferably used in thegas pipes I1, l1 carries the gas forwardly at a velocity such that combustion occurs closer to the side Walls of the port opening 5 than would be the case if high pressure were used in these supply pipes. This is desirable as heretofore pointed out, in that this combustion at or closely adjacent the port opening gives greater efficiency and avoids -any tendency of overheating the wallsof the port passageway back from the port opening. Other advantages incident to the construction will be apparent to those the art.

What I claim is:

1. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passageway for conducting the heated air to the opening,l such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a pair of gas passages through the side walls of the passageway adjacent the portopening and the bottom of the passageway, a second pair of gas passagesv through the side walls of the passageway n to the rear of the first pair of passages and at a higher level than such passages, and gas supply pipes for delivering combustible gas under pressure through all of said passages, all of said pipes being positioned transverse to the longitudinal center line of the passageway and inclined so that they deliver toward the port opening, with the angle of inclination of the pipes delivering through second pair of passages less withy respect to the longitudinal center line of the passageway than that of the pipes delivering through the other pair of passages.

2. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passageway for conducting the heated air to the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a pair of gas passages through the side walls of the passageway adjacent the port opening, a second pair of gas passages through the side walls of the passageway to the rear ofthe rst pair of passages and at a higher level than such passages, means for'supplying combustible gas under pressure through the rst passages at an angle transverse to the longitudinal center line of the passageway and also toward the port opening, and means for supplying combustible gas at a higher pressure through the second passages at a more obtuse angle to said center line than the discharge through the first passage.

3. In combination in a furnace having means for preheating the air used for combustion and a substantial distance, a pair of gas passages through the side walls of the passageway adjacent the port opening, a second pair of gas passages skilled in through the side walls of the passageway opposite the end of said division wall and at a higher level than the rst pairof passages, and gas supply pipes delivering combustible gas thnough all of said passages.

4. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passageway for conducting the heated air to the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a horizontal division wall in the passageway terminating short of the port opening a substantial distance, a pair of gas passages throughA the side walls of the passageway adjacent the port opening, a secondfpair of gas passages through the side walls of the passageway opposite the end of said division wall and at a higher level than the first pair of passages, means for supplying combustible gas under pressure through the rst pair of passages, and means for supplying combustible gas at a higher pressure through the second pair of passages. p

5. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passageway for conducting the heated airto the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a horizontal division wall in the passageway terminating short of the portl opening a substantial distance, a pair of gas passages through the side walls of the passageway adjacent the port opening, a second pair of gas passages through the side walls of, the passageway opposite the end of said division wall and at a higher level than the iirst pair of passages, means for supplying combustible gas under pressure through the first pair of passages, toward the vport opening at an acute angle to the line of now of air through the passageway, and means for supplying combustible gas at a higher pressure through the second pair` of passages toward the port opening and at a less acute angle to said line ofA flow than in the case of the rst pair of passages.

6. In combination in a furnace havingmeans for preheating the air used for combustion and.

a horizontally elongated port opening, a passageway for conducting the heated air to the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, and having. its side wall inclined toward each other from the port opening back a substantial distance, a pair of gas passages through the side walls of the passageway'adjacent the port opening,- a second pair of gas passages through the side walls of the passageway to the rear of the first pair of passages and at a higher level than such passages, and gas supply pipes for delivering combustible gas under pressure through all of said passages.

'1. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passageway for conducting the heated air to the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a horizontal division wall in the passageway terminating short 0f the port opening a substantial distance, and having its side walls inclined toward veach other f rom the port opening back a substantial distance, a pair of gas ypassages through the side walls of the passageway adjacent the port opening, a second pairof gas passages through the side walls of the passageway opposite the end of said division wall and at a higher level than the rst pair of passages, and gas supply pipes delivering combustible gas through all of said passages.

8. In combination in a furnace having means for preheating the air used for combustion and a horizontally elongated port opening, a passage- Way for conducting the heated air to the opening, such passageway having its top wall inclined upwardly from the horizontal from the port opening back a substantial distance, a horizontal` division wall in the passageway terminating short of the port opening a substantial distance, and having its side walls inclined toward each other from the port opening back a substantial diss I 3 tance, a pair of gas passages through the side wall of the passageway adjacent the port opening, a pair of gas passages through the side walls of the passageway opposite the end of said division wall and at a higher level than the rst pair of passages, means for supplying combustible gas under pressure through the rstpair of passages' toward the port opening at an` ac-ute angle to the line of flow of air through the passageway, and means for supplying combustible gas at a higher pressure through the second pair of passages toward the port opening, and at a less acute angle to said lineof flowy than in the case of the rst pair of passages.

KARL G. KUTCI-IKA.