SE126749C1

SE126749C1 -

Info

Publication number: SE126749C1
Authority: SE
Publication date: 1949-01-01

Description

Uppfinnare: H. A. Erikson. Inventor: H. A. Erikson.

Vid eldning med branslen, som innehalla hoga fuktighetshalter, t. ex. flis, har man hitintills f5r ,att underlatta branslets forbranning antingen an-Out relativt hog luftforvarmning eller oak torkat branslet fore eldningen. I det senare fallet har man for torkningen anvant rokgaser Iran eldstadssystemet. Det har sedan range statt en strid melIan dessa bada system, vilka relativt varandra medfora saval fordelar som nackdelar. Vilket av dessa system man an anvander, komma dock i hada fallen rOkgaserna att innehalla branslets hela fuktighetshalt, vilket har till fOljd, att avgaserna fa en h5g daggpunkt, yarfor man ej kan sanka deras temperatur alit-for langt, utan ,att risk for kondensation in-trader. Enar avgaserna i allmanhet innehalla sure bestandsdelar, som losas i vatten, uppsta darjamte olagenheter genom korrosion samt risk for igensattning pa de stallen, dar kondensation uppirader. When firing with the industry, which contain high humidity levels, e.g. chips, it has hitherto been possible to facilitate the combustion of the industry either an-Out relatively high air preheating or oak dried the industry before the heating. In the latter case, flue gases have been used for the drying Iran Iran fireplace system. There has since been a battle between these two systems, which relative to each other entail both advantages and disadvantages. Whichever of these systems is used, however, in some cases the flue gases will contain the entire moisture content of the industry, which has the consequence that the exhaust gases get a high dew point, so you can not lower their temperature too far, without the risk of condensation in-trader. The exhaust gases generally contain acidic constituents, which are dissolved in water, and in addition create irregularities through corrosion and the risk of clogging in the places where condensation occurs.

Uppfinningen karakteriseras i huvudsak dfirav, att torkschaktet och kanalerna for torkmediet a ena sidan samt eldstaden och kanalerna for forbranningsgaser 0. andra sidan Oro sâ anordnade, att torkmedium och forbranningsgaser Mom hela anlaggningen framledas var for sig till skilda utlopp saint att torkschaktets bransleuttag är anslutet till eldstadens bransleintag och att i ledningen for friskluft till torkschaktet fir pa kant satt an.- ordnad ytterligare en varmevaxlare for tillfOrande av varme till friskluften, innan den-BC som torkmedium och utan att blandas med r5kgaser ingar i och genomgar torkschaktet. The invention is mainly characterized in that the drying shaft and the ducts for the drying medium on the one hand and the fireplace and the ducts for combustion gases 0. on the other hand are arranged so that drying medium and combustion gases. the fireplace's fuel inlet and that in the line for fresh air to the drying shaft on the edge was arranged.- arranged another heat exchanger for supplying heat to the fresh air, before the-BC as drying medium and without mixing with flue gases enters and passes through the drying shaft.

Uppfinningen fortydligas â bifogade ritning, som sehematiskt visar en anlaggning enligt uppfinningen. The invention is clarified in the accompanying drawing, which seematically shows a plant according to the invention.

Fig. 1 visar en vertikalsektion genom en angpanna, forsedd med bransletork och varmeutvOxlingsapparater enligt uppfinningen. Fig. 2 visar schematiskt en modifikation av bransletorken. Fig. 1 shows a vertical section through a steam boiler, equipped with a fuel dryer and heat exchange apparatus according to the invention. Fig. 2 schematically shows a modification of the industry dryer.

A ritningen betecknar 1 en angpanna air vanlig typ, nedtill forsedd med rost och luftfbrdelningsanordningar. Med 2 betecknas en economiser, i vilken de fran angpannan av gaende rokgasernas varme utnyttjas. Fran economisern avga rokgaserna via en ragasflakt 3 och en skorsten 4 till det fria. Framf or angpannan är placerad en bransletork, besthende av ett Mgt vertikalt schakt 5 med luftgenomslappliga vaggar 6. I schaktets nedre del finnes en. utmatningsanordning 7, bestaende av en skrapa samt ett system av lankar, forbundna med en excenteranordning, vilken ger skrapan en fram- och atergaende rorelse. Under utmatningsanordningen finnes en tratt 8, genom vilken branslet faller ned pa rosten. I schaktets ovre del finnes en tratt 9, genom vilken fuktigt bransle frail en transportor 10 matas till torkanordningen. Pa hada sidor oni det vertikala torkschaktet finnas fordelningskamrar 11 for det torkmedium, som anvandes for torkningen. Torkmediet uppvarmes i en varmevaxlare 12, vilken kan matas med farskanga fran angpannan eller matarvatten av relativt hog temperatur och hogt tryck frail economisern. Torkmediet detta fall luft — tryckes av en flakt 13 genom varmevaxlaren och yidare i sicksack genOm bransleskiktet i torken f Or att vid torkens topp avga till en varmevaxlare eller ett atervinningsbatteri 14, dam vatluften rasp. i densamma befintligt angbildningsyarme utnyttjas for en fOrsta uppvarmning av den luft, vilken av flakten 13 drives dels till tor-ken, dais genom ledningen 17 till angpannans eldstad. Av flakten 15, placerad i yattuftsuttaget, drives den forbrukade vatluften ut i det fria. In the drawing, 1 denotes a steam boiler air ordinary type, at the bottom provided with rust and air distribution devices. 2 denotes an economiser, in which those from the steam boiler are used by the heat of the passing flue gases. From the economist, the flue gases emit via a ragas flake 3 and a chimney 4 to the open air. A fuel dryer is located in front of the boiler, consisting of a Mgt vertical shaft 5 with air-permeable cradles 6. In the lower part of the shaft there is one. discharge device 7, consisting of a scraper and a system of tongues, connected to an eccentric device, which gives the scraper a reciprocating movement. Under the discharge device there is a funnel 8, through which the fuel falls onto the grate. In the upper part of the shaft there is a funnel 9, through which moist fuel from a conveyor 10 is fed to the drying device. On each side of the vertical drying shaft there are distribution chambers 11 for the drying medium used for the drying. The drying medium is heated in a heat exchanger 12, which can be fed with farrowing steam from the steam boiler or feed water of relatively high temperature and high pressure from the economizer. The drying medium in this case is air-pressed by a flake 13 through the heat exchanger and yidare in a zigzag through the fuel layer in the dryer f Or to discharge at the top of the dryer to a heat exchanger or a recovery battery 14, dam the water air rasp. in the same existing steam formation arm is used for a first heating of the air, which is driven by the float 13 partly to the dryer, then through the line 17 to the fireplace of the steam boiler. By the flap 15, located in the surface of the surface, the spent water is expelled into the open air.

Torkningen kan, om man sa viii, ordnas med cirkulerande torkmedium enligt fig. 2. Harvid uttages endast en mindre del av den cirkulerande mangden f Or ventilation av tor-ken, En sarskild grenledning, betecknad med 18, for anvfint torkmedium forbinder ovre delen av torkschaktet med dess tilloppsledning 19 och är kopplad till flaktens 13 sugsida, medan ledningen 12 dr kopplad till flaktens trycksida. Harigenom erhalles den avsedda cirkulationen ay torkmediet. Ovriga delar i fig. 2, som ha motsyarighet i fig. 1, ha samma beteckningar som 1 sistna.mnda figur. 2— — Pet beskrivna systemet innebar flera fordelar gentemot tidigare anyanda system. Man uppnar bland annat fOljande fordelar: I den i direkt anslutning till angpannan och lampligen i form av en silo utforda bransletorken har man, i handelse av ett driftstopp, alltid en yiss mangd torn t brhnsle upplagrat, vilket underlattar ny start. Tack vare att tor-ken placerats omedelbart intill angpannan, tillfores brhnslet eldstaden i uppyarmt till-stand. Harigenom erhaller man awn ett forenklat transportsystem for branSlet samt undgar de oftast langa och besvarliga kanaler, som fdrekomma yid existerande ragastorkar. The drying can, if said viii, be arranged with circulating drying medium according to Fig. 2. In this case only a small part of the circulating amount is taken out. For ventilation of the dryer, A special branch line, denoted by 18, for used drying medium connects the upper part of the drying shaft with its inlet line 19 and is connected to the suction side of the flake 13, while the line 12 dr is connected to the pressure side of the flake. As a result, the intended circulation is obtained in the drying medium. Other parts in Fig. 2, which have contradictions in Fig. 1, have the same designations as in the last mentioned figure. 2— - The pet described system entailed several advantages over previously any other system. The following advantages are achieved, among other things: In the direct connection to the steam boiler in direct connection to the steam boiler and in the form of a silo, one has, in the event of a downtime, always stored a large number of towers, which facilitates a new start. Due to the fact that the dryer is placed immediately next to the steam boiler, the fuel is supplied to the fireplace in a heated state. In this way, a simplified transport system for the fuel is obtained and the often long and cumbersome channels, which precede existing raga dryers, are avoided.

Tack vare att brhnslet torkas, innan det infores i eldstaden, erhaller man en relativt lag daggpunkt i de fran eldstaden avgdende rokgaserna, vilket mojliggor ett langt gdende utnyttjande av ragasvarmet i en enda apparat, yarigenom man, forutom en vinst av varme, aven uppnar en enkel uppstallning. Rokgasvarmet kan dessutom utnyttjas belt for vattenuppyarmning. Thanks to the fact that the fuel is dried before it is introduced into the fireplace, a relatively low dew point is obtained in the flue gases emitting from the fireplace, which enables a long-term utilization of the ragas heat in a single appliance, whereby, in addition to a gain of heat, a simple setup. The flue gas heat can also be used as a belt for water heating.

Claims

Patent claim:

Device for drying fuel intended for the fireplace in the operation of steam boilers and other fireplaces in a drying shaft (6) arranged immediately adjacent to the fireplace, in which the fuel passes mainly through the drying medium, and the drying medium is passed through after passing through the shaft. an indirect heat exchanger (14) for the supply of surplus heat to the fresh air required for the operation of the fireplace installation, which, after passing the heat exchanger, is divided by pipes into two separate streams, one of which is introduced as combustion air The lower part, can be drawn daray, that the drying shaft and the ducts for the drying medium on the one hand and the fireplace and the ducts for the combustion gases on the other hand were arranged, that the drying medium and combustion gases from the entire plant are led to different outlets and that the drying shaft connected to the fireplace's fuel inlet. and that in the line for fresh air to the drying shaft is ph. an additional heat exchanger (12) is provided for the supply of heat to the fresh air, before this as a drying medium and without mixing with red gases enters and passes through the drying shaft.

Device according to patent claim 1, characterized in that a return line (18) for used drying medium connects the owe part of the air drying shaft with its supply line (19)) for forearm drying medium (Fig. 2). Stockholm 1949 Zungl. Batt% P. A. Norstedt & S6ner 490089