HRP990419A2

HRP990419A2 - Beater mill

Info

Publication number: HRP990419A2
Authority: HR
Inventors: Michael Franke; Thomas Krause; Georg Unland; Joerg Leuschner
Original assignee: Babcock Kraftwerkstech Gmbh
Priority date: 1999-01-27
Filing date: 1999-12-30
Publication date: 2000-10-31
Also published as: TR200000250A2; DE19903154A1; EP1023941A3; EP1023941A2

Description

Izum se odnosi na udarni rotorni mlin s udarnim rotorom koji usisava vrući transportni plin za sušenje prilikom mljevenja meljave, čije mjere su dimenzionirane za jedan slučaj primjene, prema preambuli zahtjeva 1. The invention relates to an impact rotor mill with an impact rotor that sucks in hot transport gas for drying when grinding flour, the dimensions of which are dimensioned for one application case, according to the preamble of claim 1.

Takav udarni rotorni mlin mora ispuniti zadatke usitnjavanja i pneumatskog transporta predatog goriva. Kao transportni plin koristi se vrući zrak ili vrući dimni plin. Udarni rotorni mlin dimenzioniran je za jedan određen slučaj primjene za unaprijed zadato područje opterećenja (prolaz goriva) i unaprijed zadati pojas goriva (ogrjevna vrijednost i sastav goriva). Kod promjene pojasa goriva u pravcu viših ogrjevnih vrijednosti je struja volumena transportnog plina prevelika za predatu količinu goriva, čime se povisuje temperatura prema mlinu. Ako zajedno izgori i vlažna preostala tvar, količina transportnog plina neće biti dostatna za sušenje goriva. Such a rotary impact mill must fulfill the tasks of shredding and pneumatic transport of the delivered fuel. Hot air or hot flue gas is used as the transport gas. The rotary impact mill is dimensioned for one particular application case for a predetermined load area (fuel passage) and a predetermined fuel band (calorific value and fuel composition). When changing the fuel band in the direction of higher calorific values, the transport gas volume flow is too large for the given amount of fuel, which increases the temperature towards the mill. If the moist remaining substance burns together, the amount of transport gas will not be sufficient to dry the fuel.

Za ograničenje temperature u sustavu mlina, poznato je da se u ulaznom dijelu udarnog rotornog mlina ugradi prigušna zavjesa (DE-OS 44 16 770). Ta prigušna zavjesa djelomično pokriva slobodnu priključnu površinu prema komori za mljevenje, kroz koju površinu struji transportni plin. Time prouzročeno prigušivanje usisane struje transportnog plina povezano je s gubicima prigušivanja. Korištenje regulacionih mehanizama, kao što je by-pass reguliranje ili ubrizgavanje vode (DE-PS 42 44 847), nadalje dovod primarnog zraka (DE-OS 29 21 896) recirkulirajućem dimnom plinu u mlinu također je povezano s gubicima ili pospješuje habanje. To limit the temperature in the mill system, it is known to install a damping curtain (DE-OS 44 16 770) in the entrance part of the impact rotor mill. This damping curtain partially covers the free connection surface towards the grinding chamber, through which surface the transport gas flows. The damping of the suction flow of the transport gas caused by this is related to the damping losses. The use of control mechanisms, such as by-pass control or water injection (DE-PS 42 44 847), furthermore the supply of primary air (DE-OS 29 21 896) to the recirculating flue gas in the mill is also associated with losses or promotes wear.

Nadalje je poznato (DE-GM 92 10 852), da se pogon udarnog rotornog mlina opremi sa reguliranjem broja okretaja, da bi se promjenom broja okretaja udarnog rotora utjecalo na usisanu struju transportnog plina. Kod tog reguliranja mora se uzeti u obzir, da je smanjenje broja okretaja udarnog rotora ograničeno potrebnim radom usitnjavanja. Furthermore, it is known (DE-GM 92 10 852) that the drive of the impact rotor mill is equipped with a regulation of the number of revolutions, so that by changing the number of revolutions of the impact rotor, the sucked flow of transport gas would be affected. With this regulation, it must be taken into account that the reduction in the number of revolutions of the impact rotor is limited by the necessary shredding work.

Izum se temelji na zadatku, da se udarni rotorni mlin prema vrsti tako oblikuje, da se na izvedenom mlinu izvrši promjena transportirane struje volumena transportnog plina s ciljem, da se mlin može prilagoditi izmijenjenim uvjetima rada bez gubitaka i bez velikih troškova. The invention is based on the task of designing an impact rotor mill according to its type in such a way that the transported current of the transport gas volume is changed on the derived mill with the aim that the mill can be adapted to the changed operating conditions without losses and without large costs.

Taj zadatak se kod udarnog rotornog mlina prema izumu rješava karakterističnim dijelom zahtjeva 1. Konstrukcija izuma s gore navedenom prednosti je predmet zahtjeva 2. This task in the impact rotor mill according to the invention is solved by the characteristic part of claim 1. The construction of the invention with the above-mentioned advantage is the subject of claim 2.

Ako se kod izvedenog udarnog rotornog mlina mijenjaju pogonski uvjeti u mjeri u kojoj je potrebno struju volumena transportnog plina povećati ili smanjiti, prema izumu se postojeći udarni rotor izvadi i izmijene se pločaste mrvilice. Pri tome se manje-više ugrade pločaste mrvilice ili se postojeće ravne pločaste mrvilice zamijene profiliranim pločastim mrvilicama. No, zamjena broja pločastih mrvilica se zbog rada usitnjavanja ne može vršiti neograničeno puta, ali u tehnički smisaonom i potrebnom obliku, to je moguće. If the operating conditions of the developed impact rotor mill are changed to the extent that it is necessary to increase or decrease the flow of the transport gas volume, according to the invention, the existing impact rotor is removed and the plate crushers are changed. In doing so, plate crushers are more or less installed or the existing flat plate crushers are replaced with profiled plate crushers. However, the replacement of the number of plate crumbs cannot be done an unlimited number of times due to the work of shredding, but in a technically meaningful and necessary form, it is possible.

Na slikama je prikazano više primjera izvedbe koji će u daljnjem tekstu biti pobliže objašnjeni. Crteži prikazuju: Several examples of performance are shown in the pictures, which will be explained in more detail below. The drawings show:

Slika 1 Nacrt udarnog rotornog mlina s udarni rotorom prikazanim u presjeku; Figure 1 Plan of impact rotor mill with impact rotor shown in section;

Slika 2 Bokocrt udarnog rotornog mlina s udarnim rotorom prikazanim u presjeku; i Figure 2 Side view of an impact rotor mill with an impact rotor shown in section; and

Slike 3 do 6 shematski bokocrt udarnog rotornog mlina s različitim oblicima pločaste mrvilice udarnog rotora. Figures 3 to 6 are a schematic side view of an impact rotor mill with different shapes of impact rotor plate crumb.

Prikazani udarni rotorni mlin služi za usitnjavanje pri istovremenom sušenju vlažnih, gorivih materijala, kao što su lignit ili otpaci i ostaci raznih tvari, uz korištenje vrućeg zraka ili vrućih dimnih plinova kao plina za sušenje i transportnog plina. Udarni rotorni mlin ima kućište komore za mljevenje 1 sa ulaznim dijelom 2 u obliku lijevka za stavljanje materijala koji će se usitniti i plina za sušenje i transportnog plina i s izlaznim dijelom 3 za izlaz usitnjenih materijala i plina zasušenje i transportnog plina. Na izlazni dio 3 priključuje se separator 4, na koji je priključen neprikazan vod za prašinu koji vodi do gorionika prašine. Grubi udio koji se odvoji u separatoru 4 vraća se preko povratnog voda 5 u ulazni dio 2. The shown impact rotor mill is used for shredding and simultaneous drying of wet, combustible materials, such as lignite or waste and residues of various substances, using hot air or hot flue gases as drying gas and transport gas. The impact rotor mill has a casing of the grinding chamber 1 with an inlet part 2 in the form of a funnel for placing the material to be crushed and the drying gas and transport gas and with an outlet part 3 for the exit of the crushed materials and drying gas and transport gas. The separator 4 is connected to the output part 3, to which the dust line (not shown) leading to the dust burner is connected. The rough part that is separated in the separator 4 is returned via the return line 5 to the inlet part 2.

U kućištu komore za mljevenje 1 rotira udarni rotor 6 koji djeluje kao ventilator, koji je postavljen na jednostrano uležištenoj osi mlina 9. U području udarnog rotora 6 je kućište komore za mljevenje 1 opremljeno s oklopom. In the housing of the grinding chamber 1, an impact rotor 6 that acts as a fan rotates, which is placed on the one-sidedly mounted axis of the mill 9. In the area of the impact rotor 6, the housing of the grinding chamber 1 is equipped with a shield.

Udarni rotor 6 ima aksijalni ulaz i radijalni izlaz i sastoji se od dvije pločaste mrvilice 7, 8. Prednja ploča rotora 7 izvedena je prstenasto, pri čemu otvor u ploči rotora 7 predstavlja aksijalni ulaz udarnog rotora 6, u koji prelazi ulazni dio 2 kućišta mlina 1. Stražnja ploča rotora 8 pričvršćena je na osovini mlina 9 i zaštićena naprijed postavljenom odbojnom pločom 10. The impact rotor 6 has an axial inlet and a radial outlet and consists of two plate crushers 7, 8. The front plate of the rotor 7 is made ring-shaped, with the hole in the rotor plate 7 representing the axial inlet of the impact rotor 6, into which the inlet part 2 of the mill housing passes 1. The back plate of the rotor 8 is attached to the shaft of the mill 9 and protected by the forward mounted baffle plate 10.

Obje ploče udarnog rotora 6 spojene su jedna s drugom pomoću odstojnika 11. Ploče rotora 7, 8 imaju udubljenja u obliku slova T u koja su umetnute aksijalno usmjerene pločaste mrvilice 12 koje se mogu zamijeniti, a napravljene su iz materijala otpornog na habanje. Pločaste mrvilice 12 su odstojnicima 11 i letvicama koji su bočno privijčani na ploče rotora 7, 8 ,osigurane protiv tangencijalnog pomicanja. Both plates of the impact rotor 6 are connected to each other by means of spacers 11. The rotor plates 7, 8 have T-shaped recesses into which replaceable axially directed plate crushers 12, made of wear-resistant material, are inserted. Plate crushers 12 are secured against tangential movement by spacers 11 and slats that are attached laterally to the rotor plates 7, 8.

Udarni rotor 6 udarnog rotornon mlina prikazanog na slikama 1 i 2 opremljen je s 12 pločastih mrvilica. Te pločaste mrvilice 12 su ravne. Veličina udarnog rotornog mlina dimenzionirana je za unaprijed zadati slučaj korištenja, npr. za usitnjavanje lignita u određenoj količini prolaza. Broj udarnih rotora 12 određuje se prema radu usitnjavanja koje se treba izvršiti i prema struji volumena plina za sušenje i transportnog plina koje usisava udarni rotor 6. The impact rotor 6 of the impact rotornon mill shown in Figures 1 and 2 is equipped with 12 plate crushers. Those plate crumbs 12 are flat. The size of the impact rotor mill is dimensioned for a predetermined use case, eg for pulverizing lignite in a certain amount of passes. The number of impact rotors 12 is determined according to the shredding work to be performed and according to the flow of the volume of drying gas and transport gas that is sucked in by the impact rotor 6.

Ako se u postojećem udarnom rotornom mlinu treba usitniti drugo gorivo, npr. lignit s dodatnom vlažnih preostalih tvari, za to gorivo je glede navedenih dimenzija potrebna povećana struja volumena plina za sušenje i transportnog plina. Za prilagođenje udarnog rotornog mlina na taj promijenjeni slučaj korištenja, udarni rotor 6 se izvadi, uz zadržavanje njegovih dimenzija opremi se s većim brojem pločastih mrvilica 12 i ponovno se ugradi u udarni rotorni mlin. Pri tome je primjerice umjesto dosadašnjih 12 pločastih mrvilica 12, stavljeno 14. Ako je u nekom drugom slučaju u usporedbi s gore opisanim mlinom potrebna manja struja volumena plina za sušenje i transportnog plina, broj pločastih mrvilica 12 se smanji, sa 12 na npr. 10. If another fuel is to be crushed in the existing impact rotor mill, for example lignite with additional moist residual substances, for that fuel an increased volume flow of drying gas and transport gas is required in relation to the above dimensions. To adapt the impact rotor mill to this changed case of use, the impact rotor 6 is removed, while keeping its dimensions, it is equipped with a larger number of plate crushers 12 and re-installed in the impact rotor mill. In doing so, for example, instead of the previous 12 plate crushers 12, 14 were placed. If in some other case, compared to the mill described above, a smaller flow of gas volume for drying and transport gas is required, the number of plate crushers 12 is reduced, from 12 to, for example, 10 .

Druga mogućnost prilagođavanja na promijenjene uvjete rada prikazana je na slikama 3 do 6. Samo naznačeni udarni rotor 6 tog udarnog rotornog mlina opremljen je s 12 profiliranih pločastih mrvilica 121, 122, 123, 124, koje su zakrivljene ili savijene pod kutom. Pločaste mrvilice 121, 122 prema slikama 3 i 4 zakrivljene se ili savijene pod kutom prema naprijed. Pločaste mrvilice 121, 122 s tim profiliranjem koriste se umjesto ravnih udarnih mrvilica 12 koje su korištene kod opisanog primjera, ako se treba namjestiti veća struja volumena plina za sušenje i transportnog plina. Pločaste mrvilice 123, 124, prikazane na slikama 5 i 6, zakrivljene su, odnosno savijene u koljeno prema natrag. Pločaste mrvilice 123, 124 s tim profiliranjem koriste se, ako je u usporedbi sa navedenom konstrukcijom, potrebna mala struja volumena. Promjena profiliranja pločastih mrvilica 121, 122, 123, 124 za prilagodbu na promijenjenu struje volumena može se provesti kod pločastih mrvilica koje ostaju iste ili kod promjenjenog broja pločastih mrvilica. Another possibility of adaptation to changed operating conditions is shown in Figures 3 to 6. Only the indicated impact rotor 6 of that impact rotor mill is equipped with 12 profiled plate crushers 121, 122, 123, 124, which are curved or bent at an angle. Plate crumbs 121, 122 according to figures 3 and 4 are curved or bent at an angle towards the front. The plate crushers 121, 122 with this profiling are used instead of the flat impact crushers 12 that were used in the described example, if a larger flow of drying gas volume and transport gas needs to be adjusted. Plate crumbs 123, 124, shown in pictures 5 and 6, are curved, that is, bent in a knee towards the back. Plate crushers 123, 124 with this profiling are used if, in comparison with the mentioned construction, a small flow of volume is required. Changing the profiling of plate crushers 121, 122, 123, 124 to adapt to the changed volume flow can be carried out with plate crushers that remain the same or with a changed number of plate crushers.

Claims

1. An impact rotor mill with an impact rotor (6) that sucks in hot transport gas for drying the grinding during grinding, which is dimensioned according to the predetermined use case and which has plate crushers (12) that can be replaced, indicated by the fact that when changing operating conditions, the number of plate crushers (12) can be adapted to the transport gas volume flow, which is decisive for drying during grinding, in such a way that, while maintaining the dimensions of the impact rotor (6), when the volume current increases, the number of plate crushers (12) increases, and when it decreases reduce volume currents, i.e. that the number of plate crumbs is greater or less than that of the aforementioned use.

2. Impact rotor mill with an impact rotor (6) that sucks in hot transport gas for drying the grind during grinding, which is dimensioned according to the predetermined use case and which is equipped with plate crushers (121, 122, 123, 124) that can be replaced , indicated by the fact that when the working conditions are changed, the profiling of the plate crumbs (121, 122, 123, 124) is adjusted in such a way to the transport gas volume flow, which is decisive for drying during grinding, that while maintaining the dimensions of the impact rotor (6) and the number plate crumbs, when the volume flow increases, the plate crumbs (121, 122) are curved or bent forward, and when the volume flow decreases, the plate crumbs (123, 124) are curved or bent back.