Final grinding device of raw material roller press

Abstract

The utility model belongs to the field of cement production, and particularly relates to a raw material roller press finish grinding device which comprises a first powder concentrator, a first belt conveyor is arranged above the first powder concentrator and located at a feeding port of the first powder concentrator, a first material elevator is arranged on one side of the first powder concentrator and located at the feeding port of the first powder concentrator, and a second belt conveyor is arranged on the other side of the first powder concentrator. A roller press is arranged at the bottom of the first material elevator and located at a feeding port of the first material elevator, a second powder selecting machine is arranged above the first powder selecting machine and located at a discharging port of the first powder selecting machine, and a bag type dust collector is arranged above the second powder selecting machine and located at a discharging port of the second powder selecting machine. According to the bag type dust collector with the settling chamber, large-particle dust is pre-separated through the settling chamber, the load of the bag type dust collector is reduced, the efficiency and the stability of the whole dust collection system are improved, the settling chamber is simple in structure and low in manufacturing cost, the occupied area of equipment and civil engineering investment are reduced, the maintenance workload is small, and the maintenance cost is reduced; the settling chamber can bear higher temperature, and the high-temperature waste gas is primarily treated, so that a cooling effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to cement production field, concretely relates to a raw material roller press final grinding device. BACKGROUND

[0002] At present, the raw material roller press final grinding system has been widely applied in domestic cement enterprises as an energy-saving grinding process.

[0003] However, the previous roller press final grinding system collects coarse raw material after the powder concentrator with the combined cyclone, and the fine raw material enters the kiln tail exhaust treatment system with the gas, which leads to the oxygen content exceeding the standard in the exhaust gas discharged from the kiln tail, affecting the nitrogen oxide emission index. At the same time, the raw material collected by the kiln tail exhaust treatment system is mixed with the kiln dust, and when the raw material grinding system stops running, the kiln dust cannot be uniformly mixed with the raw material, affecting the qualified rate of the raw material into the kiln and reducing the clinker quality. SUMMARY

[0004] The utility model discloses a raw material roller press final grinding device, solve the raw material roller press final grinding device of existing when using, its raw material final grinding's output and quality are not high problem, solved the equipment investment and operation maintenance cost problem of being too high simultaneously.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a raw material roller press final grinding device, including powder concentrator no.

[0006] The principle of the utility model lies in: when using, the mixed raw material fresh material is sent to the inlet of the powder concentrator no. through the belt conveyor no. and falls into it, and the raw material with larger volume is sent to the roller press first for roller pressing, and then is sent to the inlet of the powder concentrator no. through the material lifting machine no. and falls into it, the raw material falling into the powder concentrator no. is dried, scattered and selected, the coarse powder is sent back to the roller press through the material lifting machine no. for secondary roller pressing, the raw material after secondary roller pressing is sent back to the powder concentrator no. through the material lifting machine no. for powder selection again, and the fine powder is selected as the finished product and enters the bag type dust collector with the settling chamber through the airflow; the gas containing the fine powder first enters the settling chamber, preliminarily settles the large particle dust through the gravity effect, the dust-containing gas after preliminary settlement enters the bag type dust collector, the fine dust particles are intercepted on the filter bag, the dust layer accumulated on the outer surface of the filter bag is shaken off to the ash bucket through the regular cleaning operation, and the dust in the bottom of the settling chamber and the ash bucket is regularly discharged through the ash discharge device.

[0007] The beneficial effects of this utility model are as follows: By using a baghouse dust collector with a settling chamber, large dust particles are pre-separated in the settling chamber, reducing the load on the baghouse dust collector and improving the efficiency and stability of the entire dust collection system. In addition, the settling chamber has a simple structure and low cost, reducing the equipment footprint and civil engineering investment, and requiring less maintenance, thus reducing maintenance costs. Furthermore, the settling chamber can withstand high temperatures, providing preliminary treatment for high-temperature exhaust gas and playing a cooling role.

[0008] Furthermore, the first air classifier is a V-type air classifier, and the second air classifier is a high-efficiency air classifier. The V-type air classifier helps to separate coarse and fine powders for discharge.

[0009] Furthermore, a material elevator 2 is installed below the classifier 1 and at its discharge port, with the top of the material elevator 2 corresponding to the feed port of the roller press. The coarse powder screened out by the classifier 1 is then fed back to the roller press for secondary rolling via the material elevator 2.

[0010] Furthermore, a weighing chamber is provided between the material elevator and the roller press. The top inlet of the weighing chamber is connected to the outlet of the material elevator, and the bottom outlet of the weighing chamber is connected to the inlet of the roller press. The powder material that is sent back to the roller press for secondary rolling is weighed through the weighing chamber.

[0011] Furthermore, the bottom discharge port of the second classifier is connected to the inlet of the second material elevator. Through the connection between the second classifier and the second material elevator, the coarse powder screened out in the second classifier is sent back to the roller press for re-pressing, and then sent back to the first classifier for further classification.

[0012] Furthermore, the top outlet of the second classifier is connected to the inlet of the settling chamber, and the outlet of the settling chamber is connected to the inlet of the bag filter. The settling chamber allows fine powder entering from the second classifier to settle.

[0013] Furthermore, a second belt conveyor is installed at the bottom of the baghouse dust collector. The second belt conveyor transports and transfers the powder discharged from the baghouse dust collector. Attached Figure Description

[0014] Figure 1 This is a perspective view of the overall structure of a raw material roller press final grinding device according to an embodiment of the present invention.

[0015] The following detailed description illustrates the specific implementation method:

[0016] The reference numerals in the accompanying drawings of the instruction manual include: 1. Belt conveyor 1; 2. Air classifier 1; 3. Roller press 3; 4. Material elevator 1; 5. Weighing bin 5; 6. Material elevator 2; 7. Air classifier 2; 8. Bag dust collector; 9. Belt conveyor 2. DETAILED DESCRIPTION

[0017] As Figure 1 shown, the embodiment provides a raw material roller press final grinding device, which comprises a powder classifier 2, the powder classifier 2 is a V-type powder classifier, through the V-type powder classifier, the separation of coarse powder and fine powder is facilitated, a belt conveyor 1 is arranged above the powder classifier 2 and located at the feed inlet thereof, a material elevator 4 is arranged at one side of the powder classifier 2 and located at the feed inlet thereof, a roller press 3 is arranged at the bottom of the material elevator 4 and located at the feed inlet thereof, a powder classifier 7 is arranged above the powder classifier 2 and located at the discharge outlet thereof, the powder classifier 7 is a high-efficiency powder classifier, a bag-type dust collector 8 is arranged above the powder classifier 7 and located at the discharge outlet thereof, a settling chamber is arranged in the bag-type dust collector 8, and a belt conveyor 9 is arranged at the bottom of the bag-type dust collector 8. The belt conveyor 9 is used for conveying and transferring the powder discharged from the bag-type dust collector 8.

[0018] As Figure 1 shown, a material elevator 6 is arranged below the powder classifier 2 and located at the discharge outlet thereof, the top of the material elevator 6 corresponds to the feed inlet of the roller press 3, and the bottom discharge outlet of the powder classifier 7 is connected with the feed inlet of the material elevator 6. The material elevator 6 is used for sending the coarse powder screened out from the powder classifier 2 and the coarse powder screened out from the powder classifier 7 back to the roller press 3 for secondary roller pressing. A weighing bin 5 is arranged between the material elevator 6 and the roller press 3, the top feed inlet of the weighing bin 5 is connected with the discharge outlet of the material elevator 6, and the bottom discharge outlet of the weighing bin 5 is connected with the feed inlet of the roller press 3. The weighing bin 5 is used for weighing the powder sent back to the roller press 3 for secondary roller pressing. The top discharge outlet of the powder classifier 7 is connected with the feed inlet of the settling chamber, and the discharge outlet of the settling chamber is connected with the feed inlet of the bag-type dust collector 8. The settling chamber is used for performing a settling operation on the fine powder entering the settling chamber from the powder classifier 7.

[0019] The utility model discloses a specific implementation process as follows: when using, the mixed raw material fresh material is sent to the feed inlet of powder concentrator no.2 through belt conveyor no.1 and falls into it, and the raw material with larger volume is sent to the roller press no.3 first to be rolled, and then is sent to the feed inlet of powder concentrator no.2 through material elevator no.4 and falls into it, the raw material that falls into powder concentrator no.2 is dried, scattered and selected, and the coarse powder is sent back to the roller press no.3 through material elevator no.6 to be rolled secondly, the raw material after second rolling is sent back to powder concentrator no.2 through material elevator no.4 to be selected again, and the fine powder is selected finally as finished product and enters the bag type dust collector no.8 with settling chamber along with airflow; the gas containing fine powder first enters the settling chamber, and the large particle dust is preliminarily settled through gravity, the dust-containing gas after preliminary settlement enters the bag type dust collector no.8, and the fine dust particle is intercepted on the filter bag, and the dust layer accumulated on the outer surface of the filter bag is shaken off to the ash bucket through the ash removal operation regularly, and the dust in the bottom of the settling chamber and the ash bucket is discharged regularly through the ash discharge device.

[0020] The bag type dust collector no.8 with settling chamber of the scheme preliminarily separates the large particle dust in the settling chamber, reduces the load of the bag type dust collector no.8, improves the efficiency and stability of the whole dust collection system, and the settling chamber has simple structure and low cost, reduces the equipment floor area and civil engineering investment, has small maintenance workload and reduces the maintenance cost, in addition, the settling chamber can bear higher temperature, preliminarily processes the high-temperature waste gas and plays a role of temperature reduction.

[0021] Specifically, the raw material roller press final grinding device separates the cement raw material grinding system from the cement kiln tail gas treatment system, and in the traditional combined system, the temperature, humidity and composition of the kiln tail gas fluctuate and affect the raw material grinding process; after separating the cement raw material grinding system from the cement kiln tail gas treatment system, the raw material grinding can be carried out under more stable environmental conditions. For example, the grinding process can accurately control the temperature and humidity according to the characteristics of the raw material, so that the particle size distribution of the raw material particles is more reasonable, which is beneficial to improving the burnability of the raw material.

[0022] In addition, the stable grinding environment is helpful to accurately control the fineness of the raw material; for the new dry process cement production process, the fineness of the raw material is a key parameter, and appropriate fineness can ensure that the raw material fully reacts in the cement kiln. The separated system can avoid the interference of dust and other impurities possibly contained in the kiln tail gas on the measurement and control of the fineness of the raw material.

[0023] A large amount of dust and harmful gas is contained in the cement kiln tail gas. After separation, more efficient waste gas treatment equipment and process can be used according to the characteristics of the waste gas to improve the collection efficiency of the dust and make the dust emission concentration in the waste gas lower to meet more stringent environmental protection standards. For the treatment of harmful gas, the independent waste gas treatment system can flexibly select appropriate desulfurization and denitrification technology according to the composition and concentration of harmful gas in the waste gas. It is not disturbed by the raw material grinding process, so that the emission of harmful gas can be more effectively reduced.

[0024] Further, after the two systems are separated, it is more convenient for equipment maintenance. For the raw material grinding system, maintenance personnel can focus on the maintenance and maintenance of the grinding equipment, can more accurately arrange the maintenance plan, and avoid affecting the raw material grinding due to the fault of the kiln tail gas system; in management, the responsibilities of the separated systems are more clear; the operation and management personnel can independently monitor and optimize the parameters of the raw material grinding system and the waste gas treatment system.

[0025] In addition, in the production process, the operation requirements of the raw material grinding system and the cement kiln tail gas treatment system may not be synchronized; for example, when the cement kiln needs to reduce production or stop production due to some reasons such as equipment failure, market demand change, etc., the independent raw material grinding system can continue to run, reserve a certain amount of raw material, or adjust the grinding speed and yield to meet the needs of subsequent production; similarly, the waste gas treatment system can also flexibly adjust the parameters and methods of waste gas treatment according to environmental protection requirements or the running state of the kiln; for example, when the pollutant concentration of the kiln tail gas suddenly increases, the waste gas treatment system can automatically increase the amount of treatment agent or improve the operation power of the treatment equipment, without affecting the normal operation of the raw material grinding system.

[0026] It should be pointed out in advance that in the present application, unless otherwise specified and limited, the terms "installation", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The above is only an embodiment of the present application, and the well-known specific structure and characteristics in the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should be regarded as the protection scope of the present application, which will not affect the effect and practicality of the patent. The protection scope claimed in the present application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

Claims

1. A raw meal roller press finish mill device comprising a classifier, characterised in that: The upper side of the powder concentrator one is provided with a belt conveyor one, and the side of the powder concentrator one is provided with a material lifting machine one.

2. A raw meal roller press finish grinding device according to claim 1, characterized in that: The powder concentrator one is a V-shaped powder concentrator, and the powder concentrator two is a high-efficiency powder concentrator.

3. A raw meal roller press finish grinding device according to claim 2, characterized in that: The lower side of the powder concentrator one is provided with a material lifting machine two, and the top of the material lifting machine two is connected with the feeding port of the roller press.

4. A raw meal roller press finish grinding device according to claim 3, characterized in that: The material lifting machine two is provided with a weighing bin, and the top feeding port of the weighing bin is connected with the discharging port of the material lifting machine two.

5. A raw meal roller press finish grinding device according to claim 3, characterized in that: The bottom discharging port of the powder concentrator two is connected with the feeding port of the material lifting machine two.

6. A raw meal roller press finish grinding device according to claim 1, characterized in that: The top discharging port of the powder concentrator two is connected with the feeding port of the settling chamber, and the discharging port of the settling chamber is connected with the feeding port of the bag-type dust collector.

7. A raw meal roller press finish grinding device according to claim 1, characterized in that: The bottom of the bag-type dust collector is provided with a belt conveyor two.

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