Fluidized cement clinker sintering method and device for realizing zone control

Abstract

The invention relates to a fluidized cement clinker generating device capable of realizing zone control and a control method thereof, and the generating device comprises a pre-decomposition unit which comprises a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port; the pre-calcining unit comprises a pre-calcining furnace provided with a second fuel inlet and a second air distribution port, and the pre-calcining furnace is suitable for calcining the cement material subjected to preheating decomposition; the granulation / firing unit comprises a granulation / firing furnace provided with a third fuel inlet and a third air distribution port, and the granulation / firing furnace is suitable for performing granulation and firing treatment on the cement material from the pre-calcining unit to form cement clinker; the clinker cooling unit is suitable for cooling cement clinker from the granulation / firing furnace, and a pre-decomposition area in the pre-decomposition furnace, a calcination area in the pre-calcination furnace and a granulation / firing area in the granulation / firing furnace are independent of one another and used for achieving zoned control over pre-decomposition, calcination and granulation / firing.

Description

Technical Field

[0001] The invention relates to the technical field of cement, and in particular to a fluidized cement clinker burning method and device for realizing zone control. Background Art

[0002] The calcination of cement clinker mainly includes the following processes: 1) raw material preheating and CaCO3 decomposition (800-900℃); 2) 2CaO·SiO2(C2S) generation (900-1200℃); 3) 3CaO·SiO2(C3S) generation (>1300℃). The new dry process cement production process is based on suspension preheating and pre-decomposition outside the kiln. It has the advantages of low heat consumption, large single kiln production capacity, and easy operation of the automated process. It is a relatively mature technology at present.

[0003] In the new dry pre-decomposition kiln, the raw material preheating and decomposition process (<900℃) is mainly completed in the cyclone and decomposition furnace equipment at various levels, while the C2S (dicalcium silicate) and C3S (tricalcium silicate) sintering is mainly completed in the rotary kiln equipment (1000~1800℃). The rotary kiln equipment is huge, the materials in the kiln are in a piled state, the gas, liquid and solid heat exchange efficiency is low, the heat transfer speed in the kiln is slow, and the temperature is uneven. At present, the heat consumption and cost of the rotary kiln cannot be further reduced, and the maximum thermal efficiency can only reach about 60%, and it has been unable to break through the process bottleneck.

[0004] In addition, the temperature of the cement kiln head is as high as 1800℃, which makes the rotary kiln contribute 80% of thermal type and 40% of fuel type NOx. This is one of the reasons why cement kilns are an important source of fossil energy consumption and environmental pollution.

[0005] Fluidized cement calcining technology is expected to overcome the above-mentioned technical defects of rotary kiln and become a new generation of cement clinker calcining technology. Japanese patent JP01148737A discloses a method and device for calcining cement clinker, wherein the cement raw material powder preheated by four-stage cyclone and decomposed by decomposition furnace (900-1100°C) is granulated and calcined (>1450°C) in a fluidized bed, and then the calcined clinker is sent to a cooler. This method calcines cement clinker with low heat loss and high efficiency. U.S. Patent US4402754A discloses a device for calcining cement clinker using a circulating fluidized bed, wherein the cement raw material powder preheated by cyclone is calcined (950-1150°C) and clinker calcined (1400°C) in a two-stage series circulating fluidized bed device, and then discharged after cooling. This method has a high thermal efficiency for calcining clinker. Chinese patent CN114644469A discloses a fluidized treatment method and device for cement clinker. The device consists of a pre-decomposition section, a pre-calcination section, a calcination section and a cooling section. The calcination process of dicalcium silicate is separated from the calcination process of tricalcium silicate and carried out under fluidized conditions, while the calcination process of tricalcium silicate with a liquid phase is carried out in a descending bed with flue gas and material flowing downstream, thereby avoiding the agglomeration and loss of flow caused by fluidized calcination of materials in the presence of a liquid phase, and achieving long-term stable operation.

[0006] The existing cement clinker fluidized calcination method represented by Japan retains the pre-decomposition equipment of the dry pre-decomposition kiln, and simply replaces the rotary kiln with a fluidized bed, and the calcination process in the liquid phase is carried out under fluidized conditions. Although its thermal efficiency is greatly reduced compared to the rotary kiln, it is unable to stably control the reaction process of the raw material to complete the liquid phase sintering under the high-temperature fluidized state. Large-area slagging and flow loss of the material are difficult to avoid, and it is difficult to achieve long-term stable operation. In addition, the calcination of dicalcium silicate and the calcination of tricalcium silicate are still carried out under the same device, and there is room for further improvement in thermal efficiency.

[0007] The existing cement clinker zone fluidized calcination method and device separates the calcination process of dicalcium silicate from the calcination process of tricalcium silicate and carries it out under fluidized conditions, while the calcination process of tricalcium silicate with a liquid phase is carried out in a descending bed with flue gas and material flowing downstream, thereby avoiding the agglomeration and loss of flow caused by the fluidized calcination of materials under the condition of the presence of a liquid phase, and can achieve long-term stable operation. However, its calcination unit is a flue gas and material downstream heat exchange structure, and the heat transfer efficiency needs to be further improved. In addition, its partial decomposition process is not carried out under fluidized conditions, and is closely integrated with the calcination process of dicalcium silicate, without a clear distinction, and the thermal efficiency can also be further improved. Summary of the invention

[0008] The present invention is proposed to solve at least one aspect of the technical problems in the prior art.

[0009] According to one aspect of an embodiment of the present invention, a device for producing cement clinker is provided, comprising:

[0010] The pre-decomposition unit comprises a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port, and the pre-decomposition furnace is suitable for performing pre-decomposition treatment on the incoming cement raw material;

[0011] A pre-calcining unit, comprising a pre-calcining furnace provided with a second fuel inlet and a second air distribution port, the pre-calcining furnace being suitable for calcining the cement material that has been pre-heated and decomposed;

[0012] a granulation / firing unit, comprising a granulation / firing furnace provided with a third fuel inlet and a third air distribution port, the granulation / firing furnace being suitable for granulating and sintering the cement material from the pre-calcining unit to form cement clinker; and

[0013] Clinker cooling unit, suitable for cooling cement clinker coming from granulation / burning furnace,

[0014] in:

[0015] The precalcining zone in the precalcining furnace, the calcining zone in the precalcining furnace and the granulating / sintering zone in the granulating / sintering furnace are independent of each other to achieve zoned control of precalcining, calcining and granulating / sintering.

[0016] According to another aspect of an embodiment of the present invention, a control method for a cement clinker production device is provided, wherein the production device comprises: a pre-decomposition unit, comprising a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port; a pre-calcination unit, comprising a pre-calcination furnace provided with a second fuel inlet and a second air distribution port; a granulation / firing unit, comprising a granulation / firing furnace provided with a third fuel inlet and a third air distribution port; and a clinker cooling unit, wherein the method comprises the steps of:

[0017] Preheating and decomposing the incoming cement raw meal in the pre-decomposition unit;

[0018] Calcination treatment is performed on the cement material that has been pre-heated and decomposed in a pre-calcination unit;

[0019] granulating and calcining the cement material from the pre-calcining unit in a granulation / calcining unit to form cement clinker; and

[0020] Cement clinker cooling unit is used to cool cement clinker coming from granulation / burning furnace.

[0021] in:

[0022] The pre-decomposition zone in the pre-decomposition furnace, the calcination zone in the pre-calcination furnace and the granulation / sintering zone in the granulation / sintering furnace are independent of each other to achieve zoning control of pre-decomposition, calcination and granulation / sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The following description and accompanying drawings may better help understand these and other features and advantages of various embodiments disclosed by the present invention, in which the same reference numerals always represent the same components, wherein:

[0024] Figure 1 A flow chart for cement clinker generation according to an exemplary embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of a cement clinker production device according to an exemplary embodiment of the present invention, Figure 1 The flowchart shown corresponds to;

[0026] Figure 3 A flow chart for cement clinker generation according to another exemplary embodiment of the present invention;

[0027] Figure 4 is a schematic diagram of the structure of a cement clinker production device according to an exemplary embodiment of the present invention, Figure 3 The flowchart shown corresponds to the following.

[0028] Reference numerals:

[0029] Pre-decomposition unit 10, decomposition furnace 11, low-efficiency separator 12, first material return device 13;

[0030] Pre-calcining unit 20, pre-calcining furnace 21, high-efficiency separator 22, second material return device 23;

[0031] Granulation / sintering unit 30, sintering furnace 31;

[0032] Clinker cooling unit 40, cooling section 41. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0034] Figure 1 FIG. 1 is a flow chart of cement clinker production according to an exemplary embodiment of the present invention. Figure 1 As shown, in Figure 1 The cement clinker production system shown includes four units, namely a pre-decomposition unit 10, a pre-calcination unit 20, a granulation / burning unit 30, and a clinker cooling unit 40.

[0035] like Figure 1As shown, the cement raw material enters the pre-decomposition unit 10, where the cement raw material completes fluidization preheating and CaCO3 decomposition, and fuel and air distribution are introduced into the pre-decomposition unit 10. In one embodiment of the present invention, the operating temperature of the pre-decomposition unit 10 is between 800 and 900°C.

[0036] Next, the material after the decomposition of CaCO3 is completed enters the precalcination unit 20 with the high-temperature flue gas (for example, its temperature is 800-900°C), the precalcination unit 20 is fed with fuel and air distribution, and at the same time receives the high-temperature flue gas and fine particles from the granulation / firing unit 30 (as mentioned later, after being cooled by the quenching air, the temperature of the flue gas and fine particles is, for example, 1000-1100°C) and the high-temperature flue gas and fine particles from the pre-decomposition unit 10, and the cement raw material completes the pre-calcination C2S firing reaction in the pre-calcination unit 20. The combustion of fuel, the high-temperature flue gas and material from the firing unit 30, the high-temperature flue gas and material from the pre-decomposition unit 10, etc. provide the heat required for the pre-calcination reaction. The high-temperature flue gas and fine particles (for example, the temperature is 1000-1200°C) formed by the pre-calcination unit 20 enter the pre-decomposition unit 10 and participate in the raw material preheating and CaCO3 decomposition process. The operating temperature of the pre-calcining unit 20 is between 1000 and 1200°C.

[0037] See also Figure 1 After pre-calcination, the material enters the granulation / firing unit 30, where the cement raw material exchanges heat with the high-temperature flue gas in countercurrent, completes granulation and C3S burning, and forms high-temperature clinker. The granulation / firing unit 30 is equipped with quenching air to preliminarily cool the high-temperature clinker to below 1100°C. After the high-temperature flue gas and unfired fine particles are cooled to 1000-1100°C, they enter the pre-calcination unit 20 to provide heat for the pre-calcination reaction of the raw material. In one embodiment of the present invention, the operating temperature of the granulation / firing unit 30 is between 1300 and 1450°C.

[0038] Fuel and air distribution are introduced into the bottom of the granulation / firing unit 30, cement material enters from the top of the firing unit 30, and high-temperature flue gas flows out from the top of the firing unit 30. The cement material and high-temperature flue gas perform countercurrent heat exchange in the firing unit 30, and the heat transfer efficiency is greatly improved.

[0039] See also Figure 1 The high-temperature clinker is then fed into the clinker cooling unit 40, where the clinker temperature is reduced to below 500°C. Figure 1 In the illustrated embodiment, air is used as cooling air to recover the heat of the clinker, and the preheated recovered hot air (>900° C.) enters the granulation / sintering unit 30 or the pre-calcination unit 20 as distribution air to participate in fuel combustion.

[0040] In the present invention, the main reactions in the cement clinker burning process are controlled in different regions, and more accurate reaction control is achieved by controlling the temperature of each region, specifically including: CaCO3 preheating and decomposition is completed in the pre-decomposition unit 10 (e.g., 800-900°C), C2S calcination is completed in the pre-calcination unit 20 (e.g., 1000-1200°C), granulation and C3S burning are completed in the granulation / burning unit 30 (e.g., 1300-1450°C), and clinker cooling and sensible heat utilization are completed in the clinker cooling unit 40 (e.g., <500°C). Since the optimal reaction temperatures of different reactions in the cement clinker burning process are different, the matching of temperature (heat) and chemical reaction process can be achieved by controlling the different reactions in the cement clinker burning process in different regions, thereby greatly reducing the heat load of the clinker burning zone, avoiding or reducing the heat loss and low chemical reaction rate caused by temperature mismatch when C2S calcination, granulation and C3S burning are completed in the same burning zone.

[0041] In addition, Figure 1 In the embodiment shown, the material and the flue gas are countercurrently exchanged in the firing unit 30, and the heat transfer efficiency and the material residence time are further improved. The cement clinker firing method of the present invention comprises two circulation loops: one is the circulation loop of the pre-decomposition unit 10 itself, which can realize the efficient fluidized decomposition of the cement raw material. The other is the circulation loop formed between the granulation / firing unit 30 and the pre-calcination unit 20, which can realize multiple circulations of fine material particles through control, fully ensuring that the fine particle material has sufficient firing / granulation time, and effectively ensuring the firing quality of the clinker.

[0042] Figure 2 is a schematic diagram of a cement clinker production device according to an exemplary embodiment of the present invention, Figure 1 The flowchart shown corresponds to the following.

[0043] exist Figure 2 In the illustrated embodiment, the pre-decomposition unit 10 includes a decomposition furnace 11, an inefficient separator 12 and a first returner 13, in which the cement raw material completes a fluidized preheating and decomposition process (eg, 800-900°C).

[0044] Optionally, the pre-decomposition unit 10 is provided with fuel and air distribution ports for providing heat for the decomposition reaction of the decomposition furnace 11 through the combustion of the fuel.

[0045] The outlet of the low-efficiency separator 12 is connected to the bottom of the pre-calcination unit 20 , and the fine powder material and high-temperature flue gas after decomposition enter the pre-calcination unit 20 through the outlet flue of the low-efficiency separator 12 .

[0046] The pre-calcining unit 20 includes a pre-calcining furnace 21 and a high-efficiency separator 22, wherein the inlet of the pre-calcining furnace 21 is connected to the outlet of the low-efficiency separator 12 of the pre-decomposition unit, and is used to receive the fine powder particles and high-temperature flue gas (1000-1100°C) from the pre-decomposition unit 10 after the decomposition reaction. The decomposed material is calcined (1000-1200°C) in the pre-calcining furnace 21 of the pre-calcining unit to generate clinker intermediate products, mainly C2S, and the coarse particle material is separated in the high-efficiency separator 22. The separated material is transported to the calcining / granulation unit 30 through the second return feeder 23.

[0047] The granulation / firing unit 30 includes a firing furnace 31, wherein the top of the firing furnace 31 is both an inlet for coarse particles and an outlet for fine powder particles and high-temperature flue gas, and the material and flue gas are countercurrently heat exchanged. The top of the firing furnace 31 is connected to the bottom dense phase inlet of the pre-calcining furnace 21 of the pre-calcining unit 20, and is used to transport the fine particles that have not completed granulation and C3S calcination in the firing furnace 31 to the pre-calcining furnace 21 to continue the pre-calcination and granulation / firing process, and the high-temperature flue gas (1000-1200°C) that is calcined enters the pre-calcining furnace 20 to provide heat for C2S calcination; the lower part of the second returner 23 is connected to the inlet of the firing furnace 31, and is used to transport the coarse material particles separated by the high-efficiency separator 22 to the firing furnace 31, and the cement raw material completes the granulation and C3S calcination process in the firing furnace 31.

[0048] The clinker cooling unit 40 includes a clinker cooling section 41 for introducing cooling air to cool the clinker. The cooled clinker is discharged from the clinker cooling section 41. The preheated hot air (>900°C) enters the pre-calcining furnace to provide heat for C2S calcination.

[0049] In this embodiment, the clinker cooling section 41 is directly connected to the sintering furnace 31 . The clinker cooling section 41 in the clinker cooling unit 40 provides an air separation function for returning the incompletely sintered materials in the sintering furnace 31 to the pre-calcining furnace 21 .

[0050] This embodiment includes two circulation loops, namely: a self-circulation loop consisting of a pre-decomposition furnace 11, an inefficient separator 12, and a first returner 13; and a coupled circulation loop consisting of a pre-calcining furnace 21, a high-efficiency separator 22, a second returner 23, and a sintering furnace 31.

[0051] The following is an example Figure 2 The specific processing flow of the embodiment shown.

[0052] The pre-decomposition unit 10 is a circulating fluidized bed structure. The cement raw material enters from the bottom of the pre-decomposition furnace 11. After the preheating and decomposition reaction are completed in the pre-decomposition unit, the fine raw material and high-temperature flue gas enter the pre-calcination unit from the outlet of the inefficient separator. The heat required for the preheating and decomposition of the raw material in the pre-decomposition unit 10 is provided by the combustion of fuel, and the temperature is controlled at 800-900°C.

[0053] The fine powder material and high-temperature flue gas after decomposition from the pre-decomposition unit 10 enter from the bottom of the pre-calcining furnace 21 and are fluidized to complete the fluidized C2S calcination and partial granulation of particles. Fuel and air are supplied from the bottom of the pre-calcining furnace 21 to provide the heat required for C2S calcination and partial granulation. The temperature in the pre-calcining furnace 21 is controlled at 1000-1200°C.

[0054] The material particles coming out of the pre-calcining furnace 21 enter the high-efficiency separator 22 to complete the separation process of the material particles and the flue gas. The separated material particles are returned to the sintering furnace 31 through the second return feeder 23 for granulation and clinker sintering. The unseparated fine particles enter the pre-calcining furnace 21 with the high-temperature flue gas (1000-1100°C) coming out of the sintering furnace 31, and its sensible heat can be used to provide reaction heat for the pre-calcining furnace. The flue gas in the pre-calcining furnace 21 is discharged for subsequent waste heat utilization without entering the sintering furnace 31, thereby greatly reducing the amount of flue gas entering the sintering furnace 31, avoiding the technical disadvantage of excessively high flue gas volume in the sintering furnace 31 in the existing fluidized cement sintering technology.

[0055] The calcining furnace 31 is used for clinker granulation and calcining. The required heat is provided by fuel combustion, and the temperature is controlled at 1300-1450°C. The material enters from the top, and the fuel is fed in from the bottom. The air is distributed in stages along the way, and the material and the flue gas are countercurrently exchanged for heat, which greatly improves the thermal efficiency and material residence time in the calcining furnace. The large-particle cement clinker that has been granulated and calcined in the calcining furnace 31 is rapidly cooled to below 1200°C by quenching air. A return port connected to the pre-calcining furnace 21 is provided at the top of the calcining furnace 31, and the incompletely calcined clinker will be returned to the calcining furnace 21 through the return port.

[0056] The lower part of the sintering furnace 31 is connected to the cooling section 41 of the clinker cooling unit 40. Cooling air is introduced into the bottom of the cooling section 41, so that the cooling section 41 forms a fluidized bed, and the large particles of cement clinker and the finer particles of incompletely burned clinker entering the cooling section 41 complete the air separation process. The large particles of clinker are cooled to about 500°C and discharged from the bottom of the cooling section.

[0057] The finer particles of the incompletely burnt clinker are separated by air and then leave the sintering furnace through the return port at the top of the sintering furnace 31 with the high-temperature flue gas, and return to the pre-calcining furnace 21 to continue the reaction. The high-temperature flue gas (1000-1100°C) generated by the sintering furnace returns to the pre-calcining furnace through the return port to provide a certain amount of heat for the pre-calcining reaction.

[0058] The cement raw material is implemented in the cement clinker burning method of the present invention in the following process: preheating (<800°C) → decomposition (800-900°C) → C2S burning (1000-1200°C) → granulation / C3S burning (1300-1450°C) → cooling (<500°C) → clinker discharge process.

[0059] In the present invention, 1) high-temperature flue gas provides heat for preheating cement raw materials; 2) the preheated cement raw materials are decomposed in the decomposition furnace in the decomposition unit; 3) the decomposed cement materials complete the formation reaction of the key intermediate product C2S in the clinker formation and the granulation of some particles in the precalcining furnace; 4) the particles complete the granulation and C3S calcining process in the calcining furnace, the large-particle cement clinker that has been calcined is discharged after cooling, and the fine particles that have not been calcined are returned to the precalcining furnace to continue the above 3) to 4) processes, forming a cycle. 5) By controlling the flow direction of the high-temperature flue gas in each part of the entire system, the high-temperature flue gas provides heat for each part of the reaction, and the temperature (heat) and reaction are matched in the entire reaction process.

[0060] Figure 3 A flow chart for cement clinker generation according to another exemplary embodiment of the present invention; Figure 4 is a schematic diagram of a cement clinker production device according to an exemplary embodiment of the present invention, Figure 3 The flowchart shown corresponds to the following.

[0061] Figure 3-Figure 4 The embodiment shown is Figure 1-Figure 2 The embodiment shown is different in that the outlet of the high-efficiency separator 22 of the pre-calcining unit 20 is connected to the raw material preheating flue 14, the raw material is added from the preheating flue, and the heat of the high-temperature flue gas from the pre-calcination is used to preheat the raw material. The raw material preheating flue is connected to the bottom of the predecomposition furnace 11, and the high-temperature flue gas and the preheated raw material are transported to the predecomposition furnace 11 for the raw material decomposition process.

[0062] The pre-decomposition unit 10 includes a pre-decomposition furnace 11, an inefficient separator 12, a particle sorter 13, and a raw material preheating flue 14. The separator 12 of the pre-decomposition unit 10 is a high-efficiency separator, which can achieve efficient separation of fine powder materials. In addition, the first returner 13 of the pre-decomposition unit 10 has a particle sorting function, which is connected to the bottom of the pre-decomposition furnace 11 and the bottom of the pre-calcination furnace 21, and can sort the circulating coarse particle bed material from the fine powder material that has completed the decomposition reaction. The coarse particle bed material continues to circulate, and the fine powder material is transported to the pre-calcination unit. The flue gas (800-900°C) of the entire firing process flows out from the outlet of the high-efficiency separator 12 of the pre-decomposition unit 10.

[0063] The cement clinker production method of the present invention can achieve at least one of the following technical effects:

[0064] 1) Temperature matching and energy consumption reduction: by controlling the raw material decomposition reaction, dicalcium silicate burning reaction and tricalcium silicate (clinker) burning reaction in the cement clinker burning process in different regions, the temperature (heat) and chemical reaction process can be matched, thereby significantly reducing the energy consumption in the clinker burning area;

[0065] 2) The temperature is uniform and mild, reducing pollution. The main reactions in the cement clinker burning process are carried out in different regions, which further reduces the temperature of the cement high-temperature burning zone, thereby reducing the NOx generation during the high-temperature burning of cement;

[0066] 3) Fluidized reaction, good heat transfer effect;

[0067] 4) The equipment adopts fluidized structure to reduce floor space;

[0068] 5) The flue gas and materials in the clinker burning area are heat exchanged in countercurrent, which greatly increases the thermal efficiency and material residence time;

[0069] 6) A circulating bed furnace is adopted, which has circulation between the dicalcium silicate pre-calcining furnace and the tricalcium silicate (clinker) burning furnace, realizing different circulation paths for large particles and powder, realizing multiple circulations of fine particles of materials, thereby extending the circulation and burning time of unburned fine particles and improving the burning quality of cement clinker.

[0070] Based on the above, the present invention proposes the following technical solutions:

[0071] 1. A cement clinker production device, comprising:

[0072] The pre-decomposition unit comprises a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port, and the pre-decomposition furnace is suitable for performing pre-decomposition treatment on the incoming cement raw material;

[0073] A pre-calcining unit, comprising a pre-calcining furnace provided with a second fuel inlet and a second air distribution port, the pre-calcining furnace being suitable for calcining the cement material that has been pre-heated and decomposed;

[0074] a granulation / firing unit, comprising a granulation / firing furnace provided with a third fuel inlet and a third air distribution port, the granulation / firing furnace being suitable for granulating and sintering the cement material from the pre-calcining unit to form cement clinker; and

[0075] Clinker cooling unit, suitable for cooling cement clinker coming from granulation / burning furnace,

[0076] in:

[0077] The precalcining zone in the precalcining furnace, the calcining zone in the precalcining furnace and the granulating / sintering zone in the granulating / sintering furnace are independent of each other to achieve zoned control of precalcining, calcining and granulating / sintering.

[0078] 2. The generating device according to item 1, wherein: a flue gas circulation outlet communicating with the dense phase zone of the pre-calcining furnace is arranged at the top of the granulating / calcining furnace, a cement material inlet is also arranged at the top of the granulating / calcining furnace, the cement clinker is suitable for leaving the granulating / calcining furnace from the bottom of the granulating / calcining furnace, and the flue gas of the granulating / calcining furnace is suitable for leaving the granulating / calcining furnace from the flue gas circulation outlet and entering the pre-calcining furnace.

[0079] 3. The generating device according to 2, wherein:

[0080] The precalcining unit includes a precalcining furnace, a first separator and a first material returner for forming a material circulation, the upper part of the precalcining furnace is communicated with the first separator, the solid outlet of the first separator is communicated with the first material returner, the first material returner is communicated with the lower part of the precalcining furnace, the first fuel inlet and the first air distribution port are arranged at the lower part of the precalcining furnace, and the smoke outlet of the first separator is communicated with the dense phase area of ​​the precalcining furnace;

[0081] The pre-calcining unit includes a pre-calcining furnace, a second separator and a second return feeder. The second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace. The upper part of the pre-calcining furnace is communicated with the second separator. The solid outlet of the second separator is communicated with the cement material inlet at the top of the granulation / firing furnace via the second return feeder.

[0082] 4. The generating device according to 2, wherein:

[0083] The pre-calcining unit comprises a pre-calcining furnace for forming a material circulation, a first separator and a first material returner, and a first fuel inlet and a first air distribution port are arranged at the lower part of the pre-calcining furnace;

[0084] The pre-calcining unit comprises a pre-calcining furnace, a second separator and a second material returner, and the second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace;

[0085] The first material returner is a sorting material returner and is suitable for sorting the circulating bed material from the material that has completed the decomposition reaction. One outlet of the sorting material returner is connected to the lower part of the precalcining furnace to return the bed material, and the other outlet is used to transport the material that has completed the decomposition reaction and is connected to the dense phase area of ​​the precalcining furnace.

[0086] The flue gas outlet of the second separator is connected to the raw material preheating flue, and the raw material preheating flue is connected to the cement raw material inlet of the precalcining furnace. The solid outlet of the second separator is connected to the cement material inlet at the top of the granulation / burning furnace via the second return device.

[0087] 5. The generating device according to 3 or 4, wherein:

[0088] A third fuel inlet is arranged at the bottom of the granulation / sintering furnace, and a third air distribution port of the granulation / sintering furnace forms graded air distribution.

[0089] 6. The generating device according to 5, wherein:

[0090] The clinker cooling unit is integrally arranged with the granulation / sintering furnace and comprises a cooling section located below the granulation / sintering furnace;

[0091] A cooling air inlet is arranged at the bottom of the cooling section.

[0092] 7. The generating device according to 6, wherein:

[0093] The cooling air heated by the cooling section is suitable for communicating with the second air distribution port of the pre-calcining furnace.

[0094] 8. The generating device according to item 1 further comprises:

[0095] The temperature control unit is suitable for adjusting the fuel and air supply entering the pre-calcining furnace so that the temperature in the pre-calcining furnace is 800-900°C, suitable for adjusting the fuel and air supply entering the pre-calcining furnace so that the temperature in the pre-calcining furnace is 1000-1200°C, and suitable for adjusting the fuel and air supply entering the granulation / sintering unit so that the temperature in the granulation / sintering unit is 1300-1450°C.

[0096] 9. A control method for a cement clinker production device, the production device comprising: a pre-decomposition unit, comprising a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port; a pre-calcination unit, comprising a pre-calcination furnace provided with a second fuel inlet and a second air distribution port; a granulation / firing unit, comprising a granulation / firing furnace provided with a third fuel inlet and a third air distribution port; and a clinker cooling unit, the method comprising the steps of:

[0097] Preheating and decomposing the incoming cement raw meal in the pre-decomposition unit;

[0098] Calcination treatment is performed on the cement material that has been pre-heated and decomposed in a pre-calcination unit;

[0099] granulating and calcining the cement material from the pre-calcining unit in a granulation / calcining unit to form cement clinker; and

[0100] Cement clinker cooling unit is used to cool cement clinker coming from granulation / burning furnace.

[0101] in:

[0102] The pre-decomposition zone in the pre-decomposition furnace, the calcination zone in the pre-calcination furnace and the granulation / sintering zone in the granulation / sintering furnace are independent of each other to achieve zoning control of pre-decomposition, calcination and granulation / sintering.

[0103] 10. The method according to 9, wherein:

[0104] The top of the granulation / sintering furnace is provided with a cement material inlet and a flue gas circulation outlet which is in communication with the dense phase area of ​​the pre-calcining furnace so as to provide flue gas to the dense phase area of ​​the pre-calcining furnace;

[0105] The cement clinker leaves the granulation / calcination furnace from the bottom of the granulation / calcination furnace, and the flue gas of the granulation / calcination furnace leaves the granulation / calcination furnace from the flue gas circulation outlet and enters the pre-calcination furnace to form a countercurrent heat exchange between the flue gas and the cement material.

[0106] 11. The method according to 9, comprising the steps of:

[0107] Adjust the fuel and air supply to the precalciner so that the temperature in the precalciner is 800-900°C;

[0108] Adjust the fuel and air supply to the pre-calcining furnace so that the temperature in the pre-calcining furnace is 1000-1200°C;

[0109] The fuel and air supply to the granulation / calcination unit were adjusted so that the temperature inside the granulation / calcination unit was between 1300 and 1450°C.

[0110] 12. The method according to 9, wherein:

[0111] The pre-calcining unit comprises a pre-calcining furnace for forming a material circulation, a first separator and a first material returner, and a first fuel inlet and a first air distribution port are arranged at the lower part of the pre-calcining furnace;

[0112] The pre-calcining unit comprises a pre-calcining furnace, a second separator and a second material returner, and the second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace;

[0113] The first material returner is a sorting material returner and is suitable for sorting the circulating bed material from the material that has completed the decomposition reaction. One outlet of the sorting material returner is connected to the lower part of the precalcining furnace to return the bed material, and the other outlet is used to transport the material that has completed the decomposition reaction and is connected to the dense phase area of ​​the precalcining furnace.

[0114] The flue gas outlet of the second separator is connected to the raw material preheating flue, and the raw material preheating flue is connected to the cement raw material inlet of the precalcining furnace. The solid outlet of the second separator is connected to the cement material inlet at the top of the granulation / burning furnace through the second return device.

[0115] The method comprises the steps of: utilizing the flue gas from the second separator to enter the raw meal preheating flue to preheat the cement raw meal entering the pre-decomposition unit.

[0116] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for producing cement clinker, comprising: The pre-decomposition unit comprises a pre-decomposition furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port, and the pre-decomposition furnace is suitable for performing pre-decomposition treatment on the incoming cement raw material; A pre-calcining unit, comprising a pre-calcining furnace provided with a second fuel inlet and a second air distribution port, the pre-calcining furnace being suitable for calcining the cement material that has been pre-heated and decomposed; A granulation / firing unit, comprising a granulation / firing furnace provided with a third fuel inlet and a third air distribution port, the granulation / firing furnace being suitable for granulating and sintering the cement material from the pre-calcining unit to form cement clinker; and Clinker cooling unit, suitable for cooling cement clinker coming from granulation / burning furnace, in: The precalcining zone in the precalcining furnace, the calcining zone in the precalcining furnace and the granulating / sintering zone in the granulating / sintering furnace are independent of each other to achieve zoned control of precalcining, calcining and granulating / sintering.

2. The generating device according to claim 1, wherein: The top of the granulating / firing furnace is provided with a flue gas circulation outlet which is communicated with the dense phase zone of the pre-calcining furnace. The top of the granulating / firing furnace is also provided with a cement material inlet. The cement clinker is suitable for leaving the granulating / firing furnace from the bottom of the granulating / firing furnace, and the flue gas of the granulating / firing furnace is suitable for leaving the granulating / firing furnace from the flue gas circulation outlet and entering the pre-calcining furnace.

3. The generating device according to claim 2, wherein: The precalcining unit includes a precalcining furnace, a first separator and a first material returner for forming a material circulation, the upper part of the precalcining furnace is communicated with the first separator, the solid outlet of the first separator is communicated with the first material returner, the first material returner is communicated with the lower part of the precalcining furnace, the first fuel inlet and the first air distribution port are arranged at the lower part of the precalcining furnace, and the smoke outlet of the first separator is communicated with the dense phase area of ​​the precalcining furnace; The pre-calcining unit includes a pre-calcining furnace, a second separator and a second return feeder. The second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace. The upper part of the pre-calcining furnace is communicated with the second separator. The solid outlet of the second separator is communicated with the cement material inlet at the top of the granulation / firing furnace via the second return feeder.

4. The generating device according to claim 2, wherein: The pre-calcining unit comprises a pre-calcining furnace for forming a material circulation, a first separator and a first material returner, and a first fuel inlet and a first air distribution port are arranged at the lower part of the pre-calcining furnace; The pre-calcining unit comprises a pre-calcining furnace, a second separator and a second material returner, and the second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace; The first material returner is a sorting material returner and is suitable for sorting the circulating bed material from the material that has completed the decomposition reaction. One outlet of the sorting material returner is connected to the lower part of the precalcining furnace to return the bed material, and the other outlet is used to transport the material that has completed the decomposition reaction and is connected to the dense phase area of ​​the precalcining furnace. The flue gas outlet of the second separator is connected to the raw material preheating flue, and the raw material preheating flue is connected to the cement raw material inlet of the precalcining furnace. The solid outlet of the second separator is connected to the cement material inlet at the top of the granulation / burning furnace via the second return device.

5. The generating device according to claim 3 or 4, wherein: A third fuel inlet is arranged at the bottom of the granulation / sintering furnace, and a third air distribution port of the granulation / sintering furnace forms graded air distribution.

6. The generating device according to claim 5, wherein: The clinker cooling unit is integrally arranged with the granulation / sintering furnace and comprises a cooling section located below the granulation / sintering furnace; A cooling air inlet is arranged at the bottom of the cooling section.

7. The generating device according to claim 6, wherein: The cooling air heated by the cooling section is suitable for communicating with the second air distribution port of the pre-calcining furnace.

8. The generating device according to claim 1, further comprising: The temperature control unit is suitable for adjusting the fuel and air supply entering the pre-calcining furnace so that the temperature in the pre-calcining furnace is 800-900°C, suitable for adjusting the fuel and air supply entering the pre-calcining furnace so that the temperature in the pre-calcining furnace is 1000-1200°C, and suitable for adjusting the fuel and air supply entering the granulation / sintering unit so that the temperature in the granulation / sintering unit is 1300-1450°C.

9. A method for controlling a cement clinker production device, the production device comprising: The precalcining unit comprises a precalcining furnace provided with a cement raw material inlet, a first fuel inlet and a first air distribution port; The pre-calcining unit comprises a pre-calcining furnace provided with a second fuel inlet and a second air distribution port; the granulation / sintering unit comprises a granulation / sintering furnace provided with a third fuel inlet and a third air distribution port; and a clinker cooling unit, the method comprising the steps of: Preheating and decomposing the incoming cement raw meal in the pre-decomposition unit; Calcination treatment is performed on the cement material that has been pre-heated and decomposed in a pre-calcination unit; granulating and calcining the cement material from the pre-calcining unit in a granulation / calcining unit to form cement clinker; and Cement clinker cooling unit is used to cool cement clinker coming from granulation / burning furnace. in: The pre-decomposition zone in the pre-decomposition furnace, the calcination zone in the pre-calcination furnace and the granulation / sintering zone in the granulation / sintering furnace are independent of each other to achieve zoning control of pre-decomposition, calcination and granulation / sintering.

10. The method according to claim 9, wherein: The top of the granulation / sintering furnace is provided with a cement material inlet and a flue gas circulation outlet which is in communication with the dense phase area of ​​the pre-calcining furnace so as to provide flue gas to the dense phase area of ​​the pre-calcining furnace; The cement clinker leaves the granulation / calcination furnace from the bottom of the granulation / calcination furnace, and the flue gas of the granulation / calcination furnace leaves the granulation / calcination furnace from the flue gas circulation outlet and enters the pre-calcination furnace to form a countercurrent heat exchange between the flue gas and the cement material.

11. The method according to claim 9, comprising the steps of: Adjust the fuel and air supply to the precalciner so that the temperature in the precalciner is 800-900°C; Adjust the fuel and air supply to the pre-calcining furnace so that the temperature in the pre-calcining furnace is 1000-1200°C; The fuel and air supply to the granulation / calcination unit were adjusted so that the temperature inside the granulation / calcination unit was between 1300 and 1450°C.

12. The method according to claim 9, wherein: The pre-calcining unit comprises a pre-calcining furnace for forming a material circulation, a first separator and a first material returner, and a first fuel inlet and a first air distribution port are arranged at the lower part of the pre-calcining furnace; The pre-calcining unit comprises a pre-calcining furnace, a second separator and a second material returner, and the second fuel inlet and the second air distribution port are arranged at the lower part of the pre-calcining furnace; The first material returner is a sorting material returner and is suitable for sorting the circulating bed material from the material that has completed the decomposition reaction. One outlet of the sorting material returner is connected to the lower part of the precalcining furnace to return the bed material, and the other outlet is used to transport the material that has completed the decomposition reaction and is connected to the dense phase area of ​​the precalcining furnace. The flue gas outlet of the second separator is connected to the raw material preheating flue, and the raw material preheating flue is connected to the cement raw material inlet of the precalcining furnace. The solid outlet of the second separator is connected to the cement material inlet at the top of the granulation / burning furnace through the second return device. The method comprises the steps of: utilizing the flue gas from the second separator to enter the raw meal preheating flue to preheat the cement raw meal entering the pre-decomposition unit.

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