Патент USA US2108610код для вставки
Feb. 15, 19,38.‘ 2,108,610 ‘C. OTTO I‘ [OPERATION OF REGENERATIVE OVENS F'iléd July 28, 1936 2 Sheets-Sheet l / /l // W T INVENTOR éadwzzb Y _ 8% ATTORNEY F . 15, 1938. 2,108,610 c. OTTO OPERATION OF REGENERATIVE OVENS Filed July 28, 1936 Fig. 4 2 Sheets-Sheet 2 Fig. 5 INVENTOR 5“ we”. - ATTORNEY ‘ Patented Feb. 15, 1938 2,108,610 UNITED STATES PATENT - OFFICE 2,108,610 OPERATION OF REGENERATIVE OVENS Carl Otto, Essen, Germany Application July 28, 1936, Serial No. 92,968 In Germany May 17, 1935 3 Claims. (O1. 202—-241) The present invention relates to industrial . ovens adapted to be heated by rich gas and pro vided with means for pre-heating the air of 5 combustion by regenerators,‘ in particular‘ under 'fired ovens. - - ' In rich gas-heated ovens in which the air of combustion is pre-heated by means of regener ators frequently explosions occur if the place of the oven with ‘the lower portion of the re generator spaces, and is a section on line 1-1 of'Figure 2, Figure 2 is a vertical section on line 11-11 of Figure 1 the right hand portion of the ?gure being seen from the left of said line, and the left hand portion of the ?gure being seen from the right where the rich gas is shut on‘ and the place of said line, Figure 3 is an elevation of the oven parts situ yvhere the gas is burned are far distant from one-v another and spaces of larger cross sectional area ' ated below the section line III-III of Figure 2, 10 Figure 4 is a detail of Figure 1 in a somewhat exist between these two places, which explosions modi?ed form and on larger scale, and . are due to the‘ feature that the air entering said Figure 5 shows the same details in a view cor spaces or intentionally supplied to them for de responding to Figure 2. graphitizing purposes, is'mixed therein with the In the Kunder?red oven illustrated in these 15 remainder of'the rich gas so as to form an ex ?gures the stack ?ue a communicates with a plosive mixture. In order to obviate this draw back and to remove upon reversal of the draught suction blower b driven by a motor 0 which is the unburned gas remainder from the shut-off ‘started by the reversing winch (by any suitable means not shown) at the commencement of the 20 gas distributing pipes of regenerative ovens in tended for the production of gas and coke, one shutting-off operation of one group of the rich 20 has already 'connected‘the gas distributing pipes 7 gas valves or shortly before. When started, the after the gas feed has been shut off, that is, while blower b presses waste gases through a check they communicate in known manner with the valve d and an air box, or pressure equalizing chamber e into the distributing pipe f. From' 25 . outer air, to the waste heat ?ue fora short period of time, say one minute, by special connecting the latter the waste gases pass through three pipes ?tted with valves. In this way the rich >way cocks g, pipes p, and the rich gas valves h, which likewise are three way cocks, into the ‘gas still existing in the space between the shut off valve and the burning place is sucked into horizontal rich gas distributing branches m. The rich gas is supplied through a channel It and the waste heat ?ue by the pressure below atmos the ascending pipes 0 through each two rich gas pheric prevailing in this ?ue. This mode of operation, however, suffers from _ the drawback that unburned rich gas arrives in the waste heat ?ue where, if the waste gases con— tain air, it may cause explosions. In addition, a rather large quantityof rich gas gets lost there by. - I . The invention has now for its object to obviate this drawback which object is achieved by inert 40 gases being blown for some time into the rich. gas feed pipes, after the gas feed has been shut off. This operation may takelplace immediately before the commencement of the gas feed. Inert gases suited for this purpose are for example the waste gases of the oven or steam. The period of time required for blowing-in the inert gas is short when compared with the total duration of the re valves h either the upper or lower of which is opened in every regeneration period, into the'hor 'izontal rich gas distributing mains m from which vertical pipes 12 are branched off. The oven illus trated is constructed with hair-pin ?ues, so that the even-numbered pipes n are connected to one main m and the odd-numbered pipes to the other main The valves h thus communicate with the ascending pipes o as well as with a main m and with the pipes 12. The three way cock 9 communicates with the pipes 12 and with the waste heat distributing pipe I and, have further each an inlet port q for the degraphitizing air. Upon reversal of the ?ow the following opera tions take place: First the blower b is actuated to establish, and thereafter to maintain, a certain pressure in the waste heat distributing pipe f.‘ generation, it may amount to about one minute. The three way cocks g are then turned over so as In. order that the ‘invention may be clearly understood and readily carried into effect, a pre- > to connect the pipes p withthe distributing pipe f. ferred embodiment of the means for blowing-in the’ inert gas is illustrated by way of example in the accompanying drawings as applied to an un der?red coke oven. In‘these drawings Figure 1 shows part of the arched foundation Next each of the cocks h which till now has fed 50 the rich gas is turned 90 degrees ‘so that waste heat from the waste heat distributing pipe 1‘ ?ows into the main-m,till now ?lled with rich gas, and . into the rich gas branches n connected thereto, the waste heat pushing away the rich gas still ex 2,108,610 isting in the pipes 112 and n and urging it into the heating ?ues. Simultaneously also waste heat gas still present in the gas main m previously fed with gas. ’ - passes through the other valve h of the same pair vof valves into the main m which did not lead gas What I claim and desire to secure by‘ Letters Patent is: during the preceding regeneration, period and pushes out the'air previously held in the last supply rich fuel gas and degraphitizing air during mentioned pipes m and their branches n. The battery waste heat valves are turned over where by the direction of ?ow in the heating. ?ues is 10 changed. Thereuponthe main m till now not fed with gas is adjusted to’ gas feed by turning‘ over the respective valve h, whereby the next regeneration period is started. The time elaps ing between turning over' the two rich gas valves 15 It will in general be sumcient to push away by the following waste heat the gas still present in the distributing pipes. Therefore, simultane ously with the initiation of the new regeneration period,~the appropriate three way cocks y can be ‘20 turned into the positions in which, their air in let ports q are open for the passage of degraphi tizing air into the rich gas mains m'which are not ‘then feeding rich gas. Degraphitizing air may thus be supplied during the ?rst section thereof, 25 for example for 10 minutes, with a total duration . of the regeneration period of 30 minutes. In the modi?cation illustrated in Figures 4 and‘ 5 the three way cook a is ,replaced by a simple shut-off valve 1' which in general is per 30 manently open and is closed only when the heat ing wall situated above the respective pipe 17 is to be put out of operation. In this arrangement further the pipes p have trumpet-like enlarged ends 3 which open at va'certain distance apart 1. In the operation of aKregeneratiVe furnace comprising a connection operable to'alternately successive regeneration periods, the method which consists in passing an inert gas-through said connection during intervals prior to and 10. following the passage of degraphitizing air through said connection. ‘ 2. In the operation of a regenerative oven fur nace having two sets of rich fuel gas supply con nections, each set supplying rich fuel gas during 15 periods alternating with periods in which rich fuel gas is supplied by the other set, the method which consists in passing inert gas, degraphitiz ing air and inert gas successively through said supply connections during a period in which the 20 connections are notsupplying fuel gas. 3. In the operation of a regenerative coke ' oven battery having a stack ?ue drawing waste 7 gases away from the battery and having two .sets , of rich fuel gas supply connections, each connec 25 tion adapted to have its inlet portion opened to the atmosphere, each set supplying rich fuel gas during periods alternating with the periods in which rich fuel gas is supplied by the other set, the method which consists in opening the inlet 30 portionof each supply connection to the atmos phere so that atmospheric air may be drawn through the connection during periods alternat ing with periods in which rich fuel gas is supplied through said connection, and compressing waste 35 35 from the air ports of the rich gas valves h. The: gases withdrawn from the battery and passing a arrangement of the suction blower b and of the. portion ‘of said gases through each connection during a brief period intervening between each period during which rich fuel gas is supplied through said connection and the immediately fol remaining members serving to blow-in the waste heat may be the same as in the ?rst embodi ment. The waste gases are pressed into the pipes 40 i also in this embodiment vfrom the beginning of the reversal or shortly before and up till the re-~ versal is terminated. The trumpet ends s facing ' the air ports t are so- shaped and the pressure prevailing in the distributing pipe I is so selected,‘ that only waste gas enters the air ports of- the valves h and pushes away the remainders of rich lowing and immediately preceding periods during which the inlet portion of the connection is open to the atmosphere, whereby waste gases, degraph itizing air and waste gases are passed successive ly through each connection during each period in 45 which said connection is not supplying fuel gas. CARL O'I'I'O.