Energy-saving grinding method and system for raw material pre-drying synergistic acting

Abstract

The invention discloses an energy-saving grinding method and system for raw material pre-drying synergistic acting, after clinker discharged from a kiln is conveyed to a belt to be located at the bottom layer, a high-moisture raw material is conveyed to fall on the clinker, and the high-moisture raw material is pre-dried by using waste heat of the clinker; the negative pressure circulation absorption system is arranged above the belt, rising hot steam is absorbed through the negative pressure circulation absorption system, a moisture drying system is naturally formed, moisture of raw materials can be reduced without increasing power consumption, and power consumption in the cement production link can be reduced. A closed elbow chute is arranged at the feeding end of the grinding machine, so that the blanking point of materials falling into the grinding machine is shortened, the working efficiency of the grinding machine is improved, and the power consumption of the grinding machine is further reduced; the gong sieve type discharging plate is arranged above the bin partition plate of the grinding machine so as to reduce the accumulation degree of raw materials in the center of the bin partition plate, the uniformity of the raw materials passing through the second bin is improved, the material dispersion degree and the work efficiency of the second bin are improved, and the power consumption of the grinding machine is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cement processing and production, and in particular to an energy-saving grinding method and system for cooperating with raw material pre-drying. Background Art

[0002] In the cement production process, due to the high moisture content of raw materials such as desulfurized gypsum and granulated blast furnace slag, it is easy to cause a series of problems affecting the grinding efficiency and high grinding machine loading, such as material blockage, mill grate blockage, and poor ventilation in the mill. These problems have always been the shortcoming that restricts the low-consumption and high-quality operation of the cement grinding process. The high-energy-consuming links in the grinding system have serious waste of efficiency, which ultimately leads to high power consumption in the grinding process and economic and technical indicators that do not meet expectations. Without investing in large-scale technical transformation projects, how to optimize process operations, innovate management methods and improve process technologies to achieve a reduction in power consumption costs has always been the current direction of efforts. In the environment where the demand for cement market has continued to decline in recent years, the traditional production model can no longer meet the needs of high-quality development of the industry. Independent research and development of technological transformation is an inevitable choice for the development of enterprises. Summary of the Invention

[0003] The purpose of this application is to provide an energy-saving grinding method and system that cooperates with raw material pre-drying to reduce the electricity consumption cost problem in the cement processing production process.

[0004] To solve the above technical problems, the present application provides an energy-saving grinding method for raw material pre-drying and synergistic work, comprising:

[0005] After the kiln clinker is conveyed to the belt and placed on the bottom layer, the high-moisture raw materials are conveyed and dropped onto the clinker, and the high-moisture raw materials are pre-dried using the residual heat of the clinker;

[0006] A negative pressure circulation absorption system is arranged above the belt to absorb the rising hot steam;

[0007] A closed elbow chute is provided at the feed end of the grinder to shorten the drop point of the raw materials into the grinder;

[0008] A gong-screen type discharge plate is arranged above the partition plate of the grinder to reduce the accumulation degree of raw materials at the center of the partition plate.

[0009] As a preferred embodiment, an energy-saving grinding method for raw material pre-drying and coordinated work also includes:

[0010] The steel ball filling amount in the first and second bins of the grinding mill was reduced by 6% and 8% respectively.

[0011] What needs to be explained in detail in the proposal is an energy-saving grinding method that cooperates with raw material pre-drying to do work, and the steel ball filling amount in the first and second bins of the grinder is 24%-26% and 22%-25% respectively.

[0012] To solve the above technical problems, the present application also provides an energy-saving grinding system that synergizes raw material pre-drying and work, comprising:

[0013] A discharge bin is provided below the discharge bin, a belt is provided at the discharge end of the belt, a roller press is provided, the discharge end of the roller press is connected in sequence to a static powder classifier and a high-efficiency dynamic powder classifier, the coarse material discharge pipe of the high-efficiency dynamic powder classifier is connected to a grinder, the fine material discharge end of the high-efficiency dynamic powder classifier and the discharge end of the grinder are both connected to a dust collector, and the dust collector unloads the material into the cement finished product warehouse;

[0014] Wherein, a closed elbow chute is provided at the feed end of the grinder, and a gong-screen type discharge plate is provided above the partition plate of the grinder.

[0015] As a preferred embodiment, an energy-saving grinding system for raw material pre-drying and coordinated work is provided, wherein the gong-screen type discharge plate comprises a circular ring, a plurality of connecting plates are fixed to the outside of the circular ring, one end of each connecting plate is fixed to the inner wall of the grinder, and a plurality of dividing rods arranged radially thereof are fixed to the inner side of the circular ring.

[0016] As a preferred embodiment, an energy-saving grinding method for raw material pre-drying and coordinated work is provided, and each of the dividing rods is further provided with a dividing hole.

[0017] Compared with the prior art, the present invention provides an energy-saving grinding method for raw material pre-drying and coordinated work. After the kiln clinker is conveyed to the belt so that it is located at the bottom, the high-moisture raw material is conveyed so that it falls on the clinker, and the waste heat of the clinker is used to pre-dry the high-moisture raw material; a negative pressure circulation absorption system is set above the belt, and the rising hot steam is absorbed by the negative pressure circulation absorption system, naturally forming a moisture drying system, which can reduce the moisture content of the raw material without increasing power consumption, improve the phenomenon of subsequent equipment blockage, and reduce the power consumption of the cement production link. A closed elbow chute is set at the feed end of the grinder to shorten the drop point of the raw material falling into the grinder, improve the work efficiency of the grinder, and further reduce the power consumption of the grinder; a gong screen type discharge plate is set above the partition plate of the grinder to reduce the accumulation degree of the raw material at the center of the partition plate. The coordinated use of the partition plate and the gong screen type discharge plate improves the uniformity of the raw material in the second bin of the grinder, improves the material dispersion degree, improves the work efficiency of the second bin, and further reduces the power consumption of the grinder. The present application also provides an energy-saving grinding system that cooperates with raw material pre-drying to achieve the above-mentioned effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without inventiveness.

[0019] Figure 1 A flow chart of an energy-saving grinding method for raw material pre-drying and collaborative work provided in an embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of an energy-saving grinding system for raw material pre-drying and collaborative work provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the structure of a gong-screen type discharge plate provided in an embodiment of the present application;

[0022] In the figure: 1. Discharge silo; 01. Clinker discharge silo; 02. High-moisture raw material silo; 2. Belt; 3. Roller press; 4. Static powder classifier; 5. High-efficiency dynamic powder classifier; 6. Grinding mill; 7. Cement finished product warehouse; 8. Closed elbow chute; 9. Gong screen type discharge plate; 90. Ring; 91. Connecting plate; 92. Distributing rod; 920. Distributing hole; 93. Feeding hole; 10. Negative pressure circulation absorption system; 11. Dust collector. DETAILED DESCRIPTION

[0023] In order to enable people skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0024] The core of this application is to provide an energy-saving grinding method and system for cooperating with raw material pre-drying, thereby reducing the electricity consumption cost problem in the cement processing and production process.

[0025] Figure 1 This is a flow chart of an energy-saving grinding method for raw material pre-drying and collaborative work provided in an embodiment of the present application. Figure 2 This is a schematic diagram of the structure of an energy-saving grinding system for raw material pre-drying and collaborative work provided in an embodiment of the present application. Figure 3 A schematic diagram of the structure of a gong-screen type discharge plate provided in the embodiment of this application is shown in FIG. Figures 1 to 3 shown.

[0026] Example 1

[0027] An energy-saving grinding method for raw material pre-drying and synergistic work, comprising the following steps:

[0028] S1: After the kiln clinker is conveyed to the belt so that it is located at the bottom, the high-moisture raw materials are conveyed so that they fall on the clinker, and the waste heat of the clinker is used to pre-dry the high-moisture raw materials; the temperature of the clinker after leaving the kiln is generally 80-90℃. The high-moisture raw materials (desulfurization gypsum, granulated blast furnace slag, etc.) are dropped on the clinker for conveying. The high-moisture raw materials can be pre-dried using the waste heat of the clinker (that is, the temperature of the clinker) without adding any additional power. This helps to reduce a series of problems affecting grinding efficiency caused by high-moisture raw materials such as waste desulfurization gypsum and granulated blast furnace slag during the production process, such as blockage of the mill grate and poor ventilation in the mill.

[0029] S2: A negative pressure circulation absorption system is set above the belt to absorb the rising hot steam; a moisture drying system is naturally formed, which further reduces the moisture content of the raw materials without increasing additional power consumption.

[0030] S3: A closed elbow chute is set at the feed end of the grinder to shorten the drop point of the raw materials into the grinder; the setting of the closed elbow chute allows the raw materials after entering the grinder to fall directly to the zero-meter position of the first bin of the grinder, effectively exerting the work at 0-1 meters in the first bin and reducing the power consumption of the single grinder.

[0031] S4: Install a sieve-type discharge plate above the mill's partition plate to reduce the accumulation of raw materials in the center of the partition plate. The structure of the partition plate is similar to that of existing mills. The combination of the partition plate and the sieve-type discharge plate improves the uniformity of raw materials flowing into the secondary bin, enhances material dispersion, and improves the efficiency of the secondary bin.

[0032] An energy-saving grinding method that uses pre-drying of raw materials for synergistic work also includes reducing the steel ball loading in the first and second chambers of the grinding mill by 6% and 8%, respectively. Preferably, the steel ball loading in the first and second chambers of the grinding mill is 24%-26% and 22%-25%, respectively. This adjustment can reduce the grinding mill's load by 50 tons and lower the power consumption of each grinding mill.

[0033] The present invention provides an energy-saving grinding method for raw material pre-drying and coordinated work. After the kiln clinker is conveyed to the belt so that it is located at the bottom, the high-moisture raw material is conveyed to fall on the clinker, and the high-moisture raw material is pre-dried using the waste heat of the clinker; a negative pressure circulation absorption system is set above the belt, and the rising hot steam is absorbed by the negative pressure circulation absorption system, naturally forming a moisture drying system, which can reduce the moisture content of the raw material without increasing power consumption, improve the phenomenon of subsequent equipment blockage, and reduce the power consumption of the cement production link. A closed elbow chute is set at the feed end of the grinder to shorten the drop point of the raw material falling into the grinder, improve the work efficiency of the grinder, and further reduce the power consumption of the grinder; a gong screen type discharge plate is set above the partition plate of the grinder to reduce the accumulation degree of the raw material at the center of the partition plate. The coordinated use of the partition plate and the gong screen type discharge plate improves the uniformity of the raw material in the second bin of the grinder, improves the material dispersion degree, improves the work efficiency of the second bin, and further reduces the power consumption of the grinder. Through testing, process indicators met internal control requirements. The power consumption of the grinding mill decreased by 1.29 kW·h / t year-on-year, and the power consumption of the entire process decreased by 0.95 kW·h / t year-on-year. This reverse-thinking process adjustment ensured that all performance indicators of the finished cement met market demand while also reducing energy consumption.

[0034] The above describes in detail an embodiment of an energy-saving grinding method for pre-drying raw materials and co-working. Based on the energy-saving grinding method for pre-drying raw materials described in the above embodiment, an embodiment of the present invention also provides an energy-saving grinding system for pre-drying raw materials and co-working corresponding to this method. Since the embodiments of the system part and the embodiments of the method part correspond to each other, please refer to the description of the embodiments of the method part for the embodiments of the system part, and no further details will be given here.

[0035] An energy-saving grinding system for raw material pre-drying and synergistic work, comprising:

[0036] The feed bin 1 has a belt 2 installed below it. The feed bin 1 includes a clinker feed bin 01 and a high-moisture raw material bin 02. First, the clinker discharged from the kiln is added to the clinker feed bin 01, causing it to first fall onto the belt 2. Then, the high-moisture raw material is added to the high-moisture raw material bin 02, causing it to fall onto the discharged clinker. The high-moisture raw material is pre-dried using the waste heat of the discharged clinker. A negative pressure circulation absorption system 10 is installed above the belt 2. During the pre-drying process, the rising hot steam can be absorbed by the negative pressure circulation absorption system 10, naturally forming a moisture drying system that can reduce the moisture content of the raw materials without increasing additional power consumption. The discharging end of the belt 2 is provided with a roller press 3, and the materials (clinker and pre-dried high-moisture raw materials) conveyed by the belt 2 enter the roller press 3, and are pre-grinded by the roller press 3. The discharging end of the roller press 3 is connected to a static powder classifier 4 and a high-efficiency dynamic powder classifier 5 in sequence. The medium-coarse powder selected by the static powder classifier 4 enters the high-efficiency dynamic powder classifier 5 for powder selection again, and the coarse material discharge pipe of the high-efficiency dynamic powder classifier 5 is connected to a grinder 6. The fine material discharge end of the high-efficiency dynamic powder classifier 5 and the discharging end of the grinder 6 are both connected to a dust collector 11, and the dust collector 11 unloads the material to the cement finished product warehouse 7; after the high-efficiency dynamic classifier The coarse material discharged from the powder machine 5 is returned to the grinder 6 for grinding again. A closed elbow chute 8 is provided at the feed end of the grinder 6. The closed elbow chute 8 can reduce the drop point of the raw material falling into the grinder 6, thereby improving the working efficiency of the grinder 6. A gong screen type discharge plate 9 is provided above the partition plate of the grinder 6. The setting of the gong screen type discharge plate 9 can reduce the accumulation degree of the raw material at the center of the partition plate; the fine material discharged by the high-efficiency dynamic powder selector 5 can directly enter the dust collector 11, and the material after being processed by the grinder 6 can enter the dust collector 11. The material in the dust collector 11 is finally discharged to the cement finished product warehouse 7.

[0037] An energy-saving grinding system that pre-dries raw materials and works in tandem, preferably, a gong-screen-type discharge plate 9 includes a circular ring 90, a plurality of connecting plates 91 being fixed to the outside of the circular ring 90, one end of each connecting plate 91 being fixed to the inner side wall of the grinder 6, and a plurality of radially arranged dividing rods 92 being fixed to the inner side of the circular ring 90. After installation, a feed hole 93 is formed between each connecting plate 91 and the inner side wall of the grinder 6. Through the coordinated use of each dividing rod 92, the circular ring 90, and each connecting plate 91, the material can be dispersed to avoid accumulation of the material at the center of the partition plate, thereby improving the uniformity of the material entering the second bin of the grinder 6 and reducing the power consumption of the single machine of the grinder 6.

[0038] In this embodiment, an energy-saving grinding method is provided for cooperating pre-drying of raw materials. In order to further improve the dispersion of the materials, preferably, each dividing rod 92 is provided with a dividing hole 920. When in use, the ground materials can flow through each dividing hole 920.

[0039] The energy-saving grinding system provided by the present invention, which combines raw material pre-drying with power generation, can reduce the power consumption of the grinding mill (6) by 1.29 kW·h / t year-on-year, and the power consumption of the entire process by 0.95 kW·h / t year-on-year, thus reducing energy consumption during cement processing.

[0040] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this application and incorporate common knowledge or customary techniques in the art disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope of this application is indicated by the claims.

[0041] It should be understood that the present application is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The above embodiments of the present application do not constitute a limitation on the scope of protection of the present application.

Claims

1. An energy-saving grinding method for raw material pre-drying and synergistic work, characterized in that: include: After the kiln clinker is conveyed to the belt and placed on the bottom layer, the high-moisture raw materials are conveyed and dropped onto the clinker, and the high-moisture raw materials are pre-dried using the residual heat of the clinker; A negative pressure circulation absorption system is arranged above the belt to absorb the rising hot steam; A closed elbow chute is provided at the feed end of the grinder to shorten the drop point of the raw materials into the grinder; A gong-screen type discharge plate is arranged above the partition plate of the grinder to reduce the accumulation degree of raw materials at the center of the partition plate.

2. The energy-saving grinding method of raw material pre-drying and synergistic work according to claim 1 is characterized in that: Also includes: The steel ball filling amount in the first and second bins of the grinding mill was reduced by 6% and 8% respectively.

3. The energy-saving grinding method of raw material pre-drying and synergistic work according to claim 2 is characterized in that: The steel ball filling amounts in the first and second bins of the grinding machine are 24%-26% and 22%-25% respectively.

4. An energy-saving grinding system with coordinated work of raw material pre-drying, characterized in that: include: A discharge bin (1) is provided below the discharge bin (1), a belt (2) is provided at the discharge end of the belt (2), a roller press (3) is provided at the discharge end of the roller press (3), a static powder selector (4) and a high-efficiency dynamic powder selector (5) are sequentially connected at the discharge end of the roller press (3), a coarse material discharge pipe of the high-efficiency dynamic powder selector (5) is connected to a grinder (6), a fine material discharge end of the high-efficiency dynamic powder selector (5) and a discharge end of the grinder (6) are both connected to a dust collector (11), and the dust collector (11) discharges the material to a cement finished product warehouse (7); Wherein, a closed elbow chute (8) is provided at the feed end of the grinder (6), and a gong-screen type discharge plate (9) is provided above the partition plate of the grinder (6).

5. The energy-saving grinding system with coordinated work of raw material pre-drying according to claim 4 is characterized in that: The gong-screen type discharge plate (9) comprises a circular ring (90), a plurality of connecting plates (91) are fixed to the outside of the circular ring (90), one end of each connecting plate (91) is fixed to the inner wall of the grinder (6), and a plurality of dividing rods (92) arranged along the radial direction thereof are fixed to the inside of the circular ring (90).

6. The energy-saving grinding system with coordinated work of raw material pre-drying according to claim 5 is characterized in that: Each of the distribution rods (92) is also provided with a distribution hole (920).

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