FI56550C - FOERFARANDE FOER BRIKETTERING AV TORVDAMM SOM UPPSTAOR SOM AVFALL I TORVENS TORKNINGSSKEDE VID KONTINUERLIGT KOKSNINGSFOERFARANDE FOER TORV - Google Patents

Description

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ASTä (11) utläggningsskmft 5655Q

C Patent granted on 11 February 1930

Patent oydelat ^ ^ (51) Kv.lk. * / Lnt.ci. » C 10 P 5/06 FINLAND-FINLAND (*) Patent application - Pitentansttknlnj 760317 (22) Hakemlspilvl - Antöknlngtdag 11.02.76 (23) AlkupUvi — Glltlghatsdag 11.02.76 (41) Become Public - Bllvlt offentllg 12.08. 77

National Board of Patents and Registration ...., ...,, 1 (44) Date of issue and date of publication. -

Patent- och registerstyrelsen '7 Ansökan utlagd och utUkrlften publlcerad 31.10.79 (32) (33) (31) Requested privilege — Begird prloritet (71) Valtion Polttoainekeskus, Yrjönkatu h2, UOIOO Jyväskylä 10,

Suomi-Finlaad (FI) (72) Tapio Mathias Heiniö, Keski-Palokka, Suomi-Finland (Fl) (7 ^) Tapio Heiniö (5 * 0 Method in a continuous peat coking process for briquetting peat dust generated as waste during the peat drying stage -Förfarande för brikettering av torvdamm, som uppstär som avfall i torvens torkningsskede vid kontinuerligt koksningsförfarande för Torv

The invention relates to the briquetting of peat dust and peat crumb generated in a continuous peat coking process. In order to achieve the appropriate moisture content required for briquetting, the necessary peat taps are arranged for the process and the raw materials are mixed. In order for the peat to be briquetted to be fine enough, grinding is performed before it is compressed into briquettes.

Milling peat has been used as a starting material in previously known peat briquetting plants, which is artificially dried after field drying, ground, sieved and finally compressed into briquettes. The most difficult part of the process has been the artificial drying of peat. In connection with briquetting for milled peat, e.g. the following types of dryers:

Flue gas dryers where the peat is in direct contact with the flue gas and travels with the gas stream.

Pressure water steam driers, so-called Peko system where drying takes place in columns such as tubular heat exchangers with hot water and steam.

Steam flue gas driers are tumble driers in which drying takes place by means of flue gas and steam. C 10 F 7 / 0β C 10 B 53/00 2 56550.

Steam tube dryers are drum-type conveyors that are indirectly heated by steam.

After the artificial drying described above, peat is screened in known briquetting processes, whereby large particles are separated and incinerated to generate the heat of drying. Flue gas drying types also use peat grinding before drying. The briquetting step of the above processes is almost similar in all types. Peat powder is compressed into briquettes of the piston type

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for presses at a pressure of about 700 to 1000 kp / cm caused by friction between the peat and the walls of the matrix. A very important factor for successful briquetting is the moisture content, which must be 10-12 in order to obtain the strongest possible product.

When starting to make briquettes from milled peat, the problem is the inhomogeneity of the raw material. The success of briquetting depends on e.g. moisture, ash content, degree of decomposition and fractional distribution. Because of the difficulty in controlling the drying processes, it is necessary to build large mixing stocks in which different grades of peat are mixed before drying in order to obtain a uniform raw material.

The briquetting process according to the invention is characterized in that, in order to achieve a suitable briquetting moisture, peat screened dust and finely divided crushed or moist milled peat are mixed with peat fly dust before and after drying. In addition, it is desirable that the peat fly dust obtained from drying and the crushed dust and dust obtained from taps be ground after mixing before briquetting.

Because the dust from the dryer has a moisture content of 1 to 3, it is difficult to handle due to the risk of ignition and explosion. If such a substance is to be stored or transported, wetting must first be carried out. With the method according to the invention, the entire calorific value of the dust can be utilized, because the addition of water to the dust is not required. Instead, by mixing peat obtained from taps or moist peat, briquette production can be increased. As a result of the taps, the quality of the product from the coking process is likely to decrease as the ash content decreases and the coking is more even because the finer fraction and dust are screened out before coking. The process 56550 * according to the invention does not require separate drying equipment, and the mixing stock of the raw material is eliminated. In the literature, it has been shown that the moisture content of briquette-milled milled peat is the lower limit.

The accompanying drawing 1 illustrates an application example of a briquetting method according to the invention. The dried peat crumb from the dryer 1 of the tumble curing method is screened by a screen 2, which is transferred to the coking and the aliquot is transferred by a conveyor 3 to a mixing conveyor 4. From the drying gas leaving the dryer Prior to drying, the screened peat and dust is transferred to a pocket 12, from where it is lifted by a conveyor 13 to a storage silo 14, from where the peat and dust are unloaded to a mixing conveyor 4. By adjusting the amounts of peat coming to the mixing conveyor 4, the desired moisture content is reached. Peat is transferred from the mixing conveyor 4 to the crushers 6. The briquette-filled peat is transferred from the crushers pneumatically via the cyclone 7 to the distribution conveyor 8, which blames the tour for the briquetting machines 9 · The finished briquettes are transferred from the briquette presses either for packaging or bulk.

The above description and the accompanying figure are intended only to illustrate the inventive idea. The various embodiments of the invention may, of course, vary within the scope of the claims set out below. Thus, the transfer devices used in the process can be modified into different types without falling outside the scope of the invention. Likewise, briquetting can be performed with various equipment, such as piston-type or roller-type presses.

Claims (2)

56550 4 A method for briquetting peat peat generated as waste in a continuous peat coking process during the drying step of peat, characterized in that dust and fine crushed crushed peat or finely divided crushed stone are mixed into the peat dust before and after drying to achieve a suitable briquetting moisture. ?. Process according to Claim 1, characterized in that the peat fly dust obtained in the drying and the crushed dust and dust obtained in the taps are ground after mixing before briquetting.