Technological process method for producing calcium silicate board by using waste heat of cement

Abstract

The invention relates to the technical field of cement kiln waste heat utilization, and aims at solving the problems that in the prior art, the clinker utilization rate is continuously lowered, economic benefits are poor, diversified production cannot be achieved, the cement waste heat utilization rate is low, the production cost is high, the industry cannot achieve energy conservation and environmental protection, and the process arrangement flexibility is poor. According to the technological process method for producing the calcium silicate board through the cement waste heat, a waste heat power generation calcium silicate board production system, a kiln tail SP boiler system, a kiln head AQC boiler system and a grate cooler are included, superheated steam of the kiln tail SP boiler system enters the kiln head AQC boiler system, flue gas at the middle tail of the grate cooler enters the kiln head AQC boiler system, and the flue gas enters the kiln head AQC boiler system; and high-temperature saturated steam in the kiln head AQC boiler system is guided into a still kettle and a curing chamber of the waste heat-containing power generation calcium silicate board production system. The method has the beneficial effects that the clinker utilization rate is high, the economic benefit is good, diversified production is facilitated, the cement waste heat utilization rate is high, the calcium silicate board production cost is low, energy is saved, the environment is protected, and the process arrangement flexibility is high.

Description

Technical Field

[0001] The invention relates to the technical field of cement kiln waste heat utilization, and in particular to a process method for producing calcium silicate boards by utilizing cement waste heat. Background Art

[0002] Waste heat from cement kilns mainly comes from the flue gas at the tail of the kiln and the grate cooler for cooling clinker. Currently, there is little room for improvement in the parameters of grate coolers and the cost of replacement is increasing. Waste heat from cement kilns is mainly used for power generation, but the economic benefits of using heat energy only for power generation are not high. Diversified utilization of waste heat from cement kilns will become a future trend. The cost of power generation from waste heat is high and it is difficult to recover the cost in a short period of time. If you want to recover the cost in a short period of time and improve the efficiency of waste heat power generation, you need to seek diversified production of thermal energy. Summary of the invention

[0003] The present invention aims to provide a process method for producing calcium silicate board by utilizing cement waste heat, so as to solve the problems in the prior art of continuously low clinker utilization rate, poor economic benefits, inability to achieve diversified production, low cement waste heat utilization rate, high production cost, inability to save energy and protect the environment, and poor flexibility of process layout.

[0004] The embodiment of the present invention is achieved as follows:

[0005] The embodiment of the present invention provides a process method for producing calcium silicate board by utilizing cement waste heat, which includes a calcium silicate board production system containing waste heat power generation;

[0006] One end of the above-mentioned waste heat power generation calcium silicon board production system is provided with a kiln tail SP boiler system, a kiln head AQC boiler system and a grate cooler. The superheated steam generated by the above-mentioned kiln tail SP boiler system enters the above-mentioned kiln head AQC boiler system, and the flue gas at the tail of the above-mentioned grate cooler enters the above-mentioned kiln head AQC boiler system. The high-temperature saturated steam formed by the mixture in the above-mentioned kiln head AQC boiler system is introduced into the above-mentioned waste heat power generation calcium silicon board production system;

[0007] The above-mentioned calcium silicon board production system containing waste heat power generation is equipped with an autoclave and a curing room, and the high-temperature saturated steam mixed in the above-mentioned kiln head AQC boiler system is introduced into the above-mentioned autoclave and the above-mentioned curing room.

[0008] The present embodiment discloses a process flow method for producing calcium silicate boards using cement waste heat. Since the above-mentioned calcium silicate board production system containing waste heat power generation is set up next to the waste heat power generation system of the cement plant, the excess heat of the cement plant can be used not only for power generation but also for the production of calcium silicate boards. The economic benefits of production will be greatly increased, and the process flow method for producing calcium silicate boards using cement waste heat has the beneficial effects of high clinker utilization rate, good economic benefits, convenience for diversified production, high cement waste heat utilization rate, low production cost, energy saving and environmental protection, and high flexibility in process layout.

[0009] Optionally: a first steam conduit is provided at one end of the autoclave, one end of the first steam conduit is connected to the autoclave, one end of the first steam conduit away from the autoclave is connected to a steam sub-cylinder, a second steam conduit is connected between the curing room and the steam sub-cylinder, one end of the sub-cylinder is connected to a main steam conduit, and one end of the main steam conduit away from the autoclave and the curing room is connected to the kiln head AQC boiler system;

[0010] The main steam conduit is connected to a secondary steam conduit, and one end of the secondary steam conduit away from the main steam conduit is connected to the first steam conduit and the second steam conduit in sequence.

[0011] In this way, the high-temperature saturated steam from the AQC boiler system can enter the sub-cylinder through the main steam conduit, and the sub-cylinder introduces the high-temperature saturated steam into the autoclave or the curing room through the first steam conduit and the second steam conduit respectively. The auxiliary steam conduit allows the high-temperature saturated steam from the AQC boiler system to directly enter the autoclave or the curing room. By introducing the high-temperature saturated steam into the autoclave or the curing room, the calcium silicon board is cured, thereby improving the strength of the calcium silicon board.

[0012] Optionally: a temperature reducing and pressure reducing device is provided on the first steam conduit, and the temperature reducing and pressure reducing device is connected to the first steam conduit.

[0013] With such arrangement, the unstable high-temperature saturated steam is controlled through the above-mentioned temperature reducer and pressure reducer to stabilize the steam at a temperature of 100°C to 220°C and a pressure of 0.8Mpa to 1.5Mpa, which is beneficial to control the temperature and pressure inside the above-mentioned autoclave and ensure the quality of the finished calcium silicon board.

[0014] Optionally, a first pressure relief valve is provided on the first steam conduit between the autoclave and the desuperheater and pressure reducer, and a second pressure relief valve is provided on the second steam conduit.

[0015] With such arrangement, the first pressure relief valve and the second pressure relief valve can relieve pressure, so as to facilitate emergency discharge of high-temperature saturated steam inside the first steam conduit and the second steam conduit, thereby ensuring the safety of pressure relief personnel in an emergency.

[0016] Optionally: the internal temperature of the above-mentioned curing room is 50°C to 70°C, and the internal humidity of the above-mentioned curing room is 85% to 95%.

[0017] With such arrangement, the calcium silicon board placed in the curing room can be effectively cured by controlling the humidity and temperature inside the curing room, which is beneficial to the production of qualified calcium silicon boards.

[0018] Optionally: a cold air valve is provided at one end of the curing chamber close to the steam cylinder, and the cold air valve is connected to the second steam conduit along the radial direction of the second steam conduit.

[0019] With such arrangement, the cold air valve can perform secondary regulation on the oxygen and humidity inside the curing room, and can ensure that there is enough oxygen in the curing room for people to breathe.

[0020] Optionally: a first stop valve is provided at one end of the main steam conduit close to the AQC boiler system, and the first stop valve is fixedly connected to the main steam conduit;

[0021] One end of the first stop valve close to the kiln head AQC boiler system is radially connected to an emergency vent pipe, and a second stop valve is arranged on the emergency vent pipe.

[0022] In this way, the first stop valve can control the high-temperature saturated steam to enter the autoclave, the steam cylinder and the curing chamber, so that the first stop valve can control the flow direction of the high-temperature saturated steam. The second stop valve is in a closed state under normal circumstances. In case of an emergency in production, the first stop valve is quickly closed and the second stop valve on the emergency vent pipe is opened to ensure safe production.

[0023] Optionally: a first valve, a second valve, a third valve and a fourth valve are provided at one end of the main steam conduit close to the steam sub-cylinder, and the first valve is connected to the main steam conduit between the first stop valve and the steam sub-cylinder;

[0024] The second valve, the third valve and the fourth valve are all connected to the auxiliary steam conduit, the second valve is close to the first valve, the third valve is close to the intersection of the first steam conduit and the auxiliary steam conduit, and the fourth valve is close to the second steam conduit.

[0025] In such a configuration, the first valve, the second valve, the third valve and the fourth valve can control the flow route of the high-temperature saturated steam in the main steam conduit. When the first valve is closed, the second valve, the third valve and the fourth valve are opened, and the high-temperature saturated steam of the AQC boiler system directly enters the autoclave and the curing room; when the second valve, the third valve and the fourth valve are closed, and the first valve is opened, the high-temperature saturated steam of the AQC boiler system enters the autoclave and the curing room through the steam cylinder gas separation; when the first valve and the fourth valve are closed, and the second valve and the third valve are opened, the high-temperature saturated steam of the AQC boiler system can only enter the autoclave.

[0026] Optionally: the above-mentioned kiln tail SP boiler system comprises a preheater, an SP boiler, a kiln tail drum, a high-temperature fan and a first blowdown expansion tank;

[0027] A dusty flue gas pipe is connected between the top of the preheater and the SP boiler, a dusty flue gas branch pipe is connected in the radial direction of the dusty flue gas pipe, a first electric shutter valve is installed on the dusty flue gas branch pipe, and the high-temperature fan is connected to one end of the dusty flue gas branch pipe away from the dusty flue gas pipe;

[0028] The SP boiler has a first U-shaped tube, a second U-shaped tube and a third U-shaped tube inside, the inlet of the first U-shaped tube is connected to a first water inlet pipe, the outlet of the first U-shaped tube is connected to a first water outlet pipe, and the first water outlet pipe is connected to the kiln tail drum;

[0029] The inlet of the second U-shaped tube is connected to a second water inlet pipe, which is connected to the kiln tail drum; the outlet of the second U-shaped tube is connected to a saturated steam outlet pipe, which is connected to the kiln tail drum;

[0030] The inlet of the third U-shaped tube is connected to a saturated steam introduction pipe, which is connected to the kiln tail drum. The outlet of the third U-shaped tube is connected to a superheated steam pipe, which is provided with a first electric gate valve at the kiln tail, a muffler at the kiln tail and a second electric gate valve at the kiln tail.

[0031] A dusty flue gas branch pipe is connected between the bottom of the SP boiler and the dusty flue gas branch pipe, and a second electric shutter valve is installed on the dusty flue gas branch pipe;

[0032] A first sewage pipe is connected between the kiln tail drum and the first sewage expansion container, and a kiln tail electric regulating valve is installed on the first sewage pipe;

[0033] A first chain conveyor is provided at the bottom end of the SP boiler, and two groups of first ash guide pipes are connected between the SP boiler and the first chain conveyor. The two groups of first ash guide pipes are provided with a first manual gate valve, a first rotary feeder and a first flexible connection in sequence, and a first kiln ash bin is provided at the discharge end of the first chain conveyor.

[0034] With such arrangement, the above-mentioned SP boiler system at the kiln tail discharges dusty high-temperature gas through the outlet at the top of the above-mentioned preheater and enters the above-mentioned SP boiler through the above-mentioned dusty flue gas pipe. The dusty high-temperature gas exchanges heat with water in the above-mentioned SP boiler to generate superheated steam. The superheated steam enters the above-mentioned AQC boiler system at the kiln head through the above-mentioned superheated steam pipe, and then flows into the above-mentioned waste heat power generation calcium silicon board production system through the above-mentioned kiln head AQC boiler system. The dust in the dusty high-temperature gas enters the above-mentioned first chain conveyor through the above-mentioned first manual gate valve, the above-mentioned first rotary feeder and the above-mentioned first flexible connection on the above-mentioned first ash guide pipe. The above-mentioned first chain conveyor transports the kiln ash to the above-mentioned first kiln ash bin and other places for treatment.

[0035] Optionally: the kiln head AQC boiler system has an AQC boiler, and the two sides of the AQC boiler are respectively provided with a second blowdown expansion tank, a third blowdown expansion tank, a low-pressure drum and a high-pressure drum;

[0036] The AQC boiler has a common economizer, a low-pressure section evaporator, a low-pressure section superheater, a high-pressure section economizer, a high-pressure section evaporator, a high-pressure section low-temperature superheater and a high-pressure section high-temperature superheater inside;

[0037] The inlet of the public economizer is connected to a feed water pump, the outlet of the public economizer is connected to a second water outlet pipe, and the second water outlet pipe is connected to the first water inlet pipe;

[0038] The inlet and outlet of the low-pressure section evaporator are both connected to the low-pressure drum, a third water inlet pipe is connected between the low-pressure drum and the first water inlet pipe, and a first electric regulating valve at the kiln head is connected in parallel to the third water inlet pipe;

[0039] The low-pressure section superheater is connected to the low-pressure drum, and the inlet of the high-pressure section economizer is connected to the first water inlet pipe. The first water inlet pipe is provided with an electric water inlet stop valve and a second electric regulating valve in parallel with the kiln head;

[0040] The outlet of the high-pressure section economizer is connected to the high-pressure drum, the inlet and outlet of the high-pressure section evaporator are both connected to the high-pressure drum, one end of the high-pressure section low-temperature superheater is connected to the high-pressure drum, the other end of the high-pressure section low-temperature superheater and one end of the high-pressure section high-temperature superheater are both connected to the superheated steam pipe, the other end of the high-pressure section high-temperature superheater is connected to an air guide pipe, the air guide pipe is connected to the main steam conduit, and the air guide pipe is provided with an emergency air release valve, a first electric gate valve at the kiln head, a second electric gate valve at the kiln head and a steam turbine room;

[0041] The outlet of the second blowdown expansion tank and the outlet of the third blowdown expansion tank are both connected to the first blowdown system, the inlet of the second blowdown expansion tank is connected to the low-pressure boiler drum, a third electric stop valve is connected between the inlet of the second blowdown expansion tank and the low-pressure boiler drum, the inlet of the third blowdown expansion tank is connected to the high-pressure boiler drum, and a fourth electric stop valve is connected between the inlet of the third blowdown expansion tank and the high-pressure boiler drum;

[0042] The bottom of the AQC boiler is connected to the grate cooler, a second chain conveyor is provided at the bottom of the AQC boiler, a second ash guide pipe is connected between the AQC boiler and the second chain conveyor, a second manual gate valve, a second rotary feeder and a second flexible connection are provided on the second ash guide pipe in sequence, and a second kiln ash bin is provided at the discharge end of the second chain conveyor.

[0043] With such arrangement, the dusty high-temperature gas with a tail temperature of 240°C to 400°C in the grate cooler arranged at the lower part of the kiln head AQC boiler system enters the AQC boiler, and the dusty high-temperature gas is heat-exchanged with water in the AQC boiler to generate high-temperature saturated steam, and the high-temperature saturated steam enters the air guide pipe and is discharged into the turbine room or the main steam duct through the emergency air release valve, the first electric gate valve at the kiln head and the second electric gate valve at the kiln head, thereby facilitating the discharge of the high-temperature saturated steam into the production system of calcium silicate board containing waste heat power generation, wherein the superheated steam from the SP boiler system at the kiln tail enters the AQC boiler system at the kiln head, the low-temperature saturated steam mixed by the AQC boiler system at the kiln head enters the SP boiler again through the first water inlet pipe for reuse, and the high-temperature saturated steam mixed by the AQC boiler system at the kiln head enters the steam distribution cylinder through the first stop valve and the first valve, and the high-temperature saturated steam is distributed to the autoclave and the curing room through the steam distribution cylinder to achieve the curing of the calcium silicate board.

[0044] Optionally, one end of the autoclave is provided with an open cover, and a curing trolley is provided at the end of the autoclave close to the open cover, and the curing trolley moves along the axial direction of the autoclave.

[0045] With such arrangement, the curing trolley is convenient for delivering the calcium silicon board to be processed into the autoclave for processing, and the opening cover achieves a sealing effect and can be opened or closed, so as to facilitate the entry and exit of the curing trolley.

[0046] Optionally, a sewage discharge pipe opening is provided on the side of one end of the autoclave away from the lid.

[0047] In this way, the sewage discharge pipe opening is arranged so that the waste water generated in the autoclave is discharged through the sewage discharge pipe opening, thereby avoiding affecting the finished products in the autoclave.

[0048] In summary, the process method for producing calcium silicate board by utilizing cement waste heat disclosed in the present invention has the beneficial effects of high clinker utilization rate, good economic benefit, convenient diversified production, high cement waste heat utilization rate, low production cost, energy saving and environmental protection, and high flexibility of process layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 This is a process flow chart of waste heat power generation in a process method for producing calcium silicate board using waste heat of cement according to an embodiment of the present invention;

[0051] Figure 2 This is a process flow chart of a system for producing calcium silicon boards for power generation with waste heat in an embodiment of the present invention;

[0052] Figure 3 It is a process flow chart of the SP boiler system at the kiln tail in an embodiment of the present invention;

[0053] Figure 4 It is a process flow chart of the kiln head AQC boiler system in an embodiment of the present invention;

[0054] Figure 5 This is a process flow chart of power generation without waste heat in the second embodiment of the present invention.

[0055] Icons: 1- Production system of calcium silicon board with waste heat power generation, 2- SP boiler system at the end of kiln, 3- AQC boiler system at the head of kiln, 4- grate cooler, 5- autoclave, 6- curing room, 7- first steam duct, 8- sub-cylinder, 9- second steam duct, 10- main steam duct, 11- auxiliary steam duct, 12- temperature and pressure reducer, 13- first pressure relief valve, 14- second pressure relief valve, 15- cold air valve, 16- first stop valve, 17- emergency vent pipe, 18- second stop valve, 19- first valve, 20- second valve, 21- third valve, 22- fourth valve, 23- preheater, 24- SP boiler, 25- drum at the end of kiln, 26- high temperature fan, 27- first sewage expansion tank, 28- dusty flue gas pipe, 29- dusty Flue gas branch pipe, 30-first electric shutter valve, 31-first U-shaped pipe, 32-second U-shaped pipe, 33-third U-shaped pipe, 34-first water inlet pipe, 35-first water outlet pipe, 36-second water inlet pipe, 37-export saturated steam pipe, 38-introduction saturated steam pipe, 39-superheated steam pipe, 40-first electric gate valve at the end of the kiln, 41-muffler at the end of the kiln, 42-second electric gate valve at the end of the kiln, 43-dust flue gas branch pipe, 44-second electric shutter valve, 45-first sewage pipe, 46-electric regulating valve at the end of the kiln, 47-first chain conveyor, 48-first ash guide pipe, 49-first manual gate valve, 50-first rotary feeder, 51-first soft connection, 52-first kiln ash bin, 53-AQC boiler, 54-second sewage Expansion tank, 55-third sewage expansion tank, 56-low-pressure drum, 57-high-pressure drum, 58-public economizer, 59-low-pressure section evaporator, 60-low-pressure section superheater, 61-high-pressure section economizer, 62-high-pressure section evaporator, 63-high-pressure section low-temperature superheater, 64-high-pressure section high-temperature superheater, 65-feedwater pump, 66-second outlet pipe, 67-third inlet pipe, 68-kiln head first electric regulating valve, 69-electric inlet stop valve, 70-kiln head second electric regulating valve, 71-air guide pipe, 72-emergency air release valve, 73-kiln head first electric gate valve, 74-kiln head second electric gate valve, 75-turbine room, 76-first sewage system, 77-third electric stop valve, 78-fourth electric stop valve, 79-first Second chain conveyor, 80-second ash guide pipe, 81-second manual gate valve, 82-second rotary feeder, 83-second flexible connection, 84-second kiln ash bin, 85-steam generator, 86-high temperature boiler, 87-fourth sewage expansion tank, 88-switch valve, 89-second sewage system, 90-second electric gate valve, 91-fourth flexible connection, 92-second dust collector, 93-air cooling valve, 94-third chain conveyor, 95-third ash guide pipe, 96-third manual gate valve, 97-third rotary feeder, 98-fifth flexible connection, 99-third kiln ash bin, 100-opening cover, 101-steaming trolley, 102-sewage pipe outlet, 103-first electric gate valve, 104-third flexible connection, 105-first dust collector. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0057] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Embodiment 1

[0059] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In the case of waste heat power generation, this embodiment proposes a process method for producing calcium silicate board using waste heat of cement, including a waste heat power generation calcium silicate board production system 1;

[0060] One end of the waste heat power generation calcium silicon board production system 1 is provided with a kiln tail SP boiler system 2, a kiln head AQC boiler system 3 and a grate cooler 4. The superheated steam generated by the kiln tail SP boiler system 2 enters the kiln head AQC boiler system 3, and the flue gas at the tail of the grate cooler 4 enters the kiln head AQC boiler system 3. The high-temperature saturated steam is mixed in the kiln head AQC boiler system 3 and introduced into the waste heat power generation calcium silicon board production system 1;

[0061] The waste heat power generation calcium silicon board production system 1 is provided with an autoclave 5 and a curing room 6. The high-temperature saturated steam mixed in the kiln head AQC boiler system 3 is introduced into the autoclave 5 and the curing room 6.

[0062] The present embodiment discloses a process method for producing calcium silicate boards using waste heat from cement. Since a calcium silicate board production system 1 containing waste heat power generation is set up next to the waste heat power generation system of the cement plant, the excess heat of the cement plant can be used not only for power generation but also for the production of calcium silicate boards. The economic benefits of production will be greatly increased, and the process method for producing calcium silicate boards using waste heat from cement has the beneficial effects of high clinker utilization, good economic benefits, convenience for diversified production, high cement waste heat utilization, low production cost, energy saving and environmental protection, and high flexibility in process layout.

[0063] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A first steam conduit 7 is provided at one end of the autoclave 5, one end of the first steam conduit 7 is connected to the autoclave 5, one end of the first steam conduit 7 away from the autoclave 5 is connected to a sub-cylinder 8, a second steam conduit 9 is connected between the curing chamber 6 and the sub-cylinder 8, one end of the sub-cylinder 8 is connected to a main steam conduit 10, one end of the main steam conduit 10 away from the autoclave 5 and the curing chamber 6 is connected to the kiln head AQC boiler system 3; the main steam conduit 10 is connected to an auxiliary steam conduit 11, and one end of the auxiliary steam conduit 11 away from the main steam conduit 10 is connected to the first steam conduit 11 in sequence The pipe 7 and the second steam conduit 9 are arranged in this way, so that the high-temperature saturated steam from the kiln head AQC boiler system 3 can enter the sub-cylinder 8 through the main steam conduit 10, and the sub-cylinder 8 introduces the high-temperature saturated steam into the autoclave 5 or the curing chamber 6 through the first steam conduit 7 and the second steam conduit 9 respectively, and the auxiliary steam conduit 11 allows the high-temperature saturated steam from the kiln head AQC boiler system 3 to directly enter the autoclave 5 or the curing chamber 6. By introducing the high-temperature saturated steam into the autoclave 5 or the curing chamber 6, the calcium silicon board is cured, thereby improving the strength of the calcium silicon board.

[0064] A temperature reducer and pressure reducer 12 is provided on the first steam conduit 7, and the temperature reducer and pressure reducer 12 is connected to the first steam conduit 7. The unstable high-temperature saturated steam is controlled by the temperature reducer and pressure reducer 12 to stabilize the steam temperature at 100°C to 220°C and the pressure at 0.8Mpa to 1.5Mpa, which is beneficial to control the temperature and pressure inside the autoclave 5, so as to ensure the quality of the finished calcium silicon board.

[0065] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A first pressure relief valve 13 is provided on the first steam conduit 7 between the autoclave 5 and the temperature reducing and pressure reducing device 12, and a second pressure relief valve 14 is provided on the second steam conduit 9. The first pressure relief valve 13 and the second pressure relief valve 14 can relieve pressure, so as to facilitate emergency discharge of high-temperature saturated steam inside the first steam conduit 7 and the second steam conduit 9, and ensure the safety of the pressure relief personnel in an emergency.

[0066] The internal temperature of the curing room 6 is 50°C to 70°C, and the internal humidity of the curing room 6 is 85% to 95%. By controlling the humidity and temperature inside the curing room 6, the calcium silicon board placed inside the curing room 6 can be effectively cured, which is conducive to the production of qualified calcium silicon boards.

[0067] A cold air valve 15 is provided at one end of the curing room 6 close to the steam cylinder 8. The cold air valve 15 is connected to the second steam duct 9 along the radial direction of the second steam duct 9. The cold air valve 15 can perform secondary regulation on the oxygen and humidity inside the curing room 6, thereby ensuring that there is enough oxygen in the curing room 6 for people to breathe.

[0068] A first stop valve 16 is provided at one end of the main steam conduit 10 close to the kiln head AQC boiler system 3, and the first stop valve 16 is fixedly connected to the main steam conduit 10; an emergency vent pipe 17 is radially connected to one end of the first stop valve 16 close to the kiln head AQC boiler system 3, and a second stop valve 18 is provided on the emergency vent pipe 17. The first stop valve 16 can control the high-temperature saturated steam to enter the autoclave 5, the steam cylinder 8 and the curing room 6, so that the first stop valve 16 can control the flow direction of the high-temperature saturated steam. The second stop valve 18 is in a closed state under normal circumstances. In case of an emergency in production, the first stop valve 16 is quickly closed, and the second stop valve 18 on the emergency vent pipe 17 is opened to ensure safe production.

[0069] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The first valve 19, the second valve 20, the third valve 21 and the fourth valve 22 are provided at one end of the main steam conduit 10 close to the sub-cylinder 8. The first valve 19 is connected to the main steam conduit 10 between the first stop valve 16 and the sub-cylinder 8; the second valve 20, the third valve 21 and the fourth valve 22 are all connected to the auxiliary steam conduit 11, the second valve is close to the first valve 19, the third valve 21 is close to the intersection of the first steam conduit 7 and the auxiliary steam conduit 11, and the fourth valve 22 is close to the second steam conduit 9. The first valve 19, the second valve 20, the third valve 21 and the fourth valve 22 can control the main steam conduit 10, when the first valve 19 is closed, the second valve 20, the third valve 21 and the fourth valve 22 are opened, the high-temperature saturated steam of the kiln head AQC boiler system 3 directly enters the autoclave 5 and the curing room 6; when the second valve 20, the third valve 21 and the fourth valve 22 are closed, the first valve 19 is opened, the high-temperature saturated steam of the kiln head AQC boiler system 3 enters the autoclave 5 and the curing room 6 through the gas distribution cylinder 8; when the first valve 19 and the fourth valve 22 are closed, the second valve 20 and the third valve 21 are opened, the high-temperature saturated steam of the kiln head AQC boiler system 3 can only enter the autoclave 5.

[0070] The kiln tail SP boiler system 2 comprises a preheater 23, an SP boiler 24, a kiln tail drum 25, a high temperature fan 26 and a first blowdown expansion container 27;

[0071] A dusty flue gas pipe 28 is connected between the top of the preheater 23 and the SP boiler 24, a dusty flue gas branch pipe 29 is connected radially to the dusty flue gas pipe 28, a first electric shutter valve 30 is installed on the dusty flue gas branch pipe 29, and a high-temperature fan 26 is connected to one end of the dusty flue gas branch pipe 29 away from the dusty flue gas pipe 28;

[0072] The SP boiler 24 has a first U-shaped tube 31, a second U-shaped tube 32 and a third U-shaped tube 33 inside. The inlet of the first U-shaped tube 31 is connected to a first water inlet pipe 34, and the outlet of the first U-shaped tube 31 is connected to a first water outlet pipe 35. The first water outlet pipe 35 is connected to the kiln tail drum 25.

[0073] The inlet of the second U-shaped tube 32 is connected to a second water inlet pipe 36, which is connected to the kiln tail drum 25; the outlet of the second U-shaped tube 32 is connected to a saturated steam outlet pipe 37, which is connected to the kiln tail drum 25;

[0074] The inlet of the third U-shaped tube 33 is connected to a saturated steam introduction pipe 38, which is connected to the kiln tail drum 25. The outlet of the third U-shaped tube 33 is connected to a superheated steam pipe 39, on which a first kiln tail electric gate valve 40, a kiln tail muffler 41 and a second kiln tail electric gate valve 42 are provided.

[0075] A dusty flue gas branch pipe 43 is connected between the bottom of the SP boiler 24 and the dusty flue gas branch pipe 29, and a second electric shutter valve 44 is installed on the dusty flue gas branch pipe 43;

[0076] A first sewage pipe 45 is connected between the kiln tail drum 25 and the first sewage expansion container 27, and a kiln tail electric regulating valve 46 is installed on the first sewage pipe 45;

[0077] The bottom end of the SP boiler 24 is provided with a first chain conveyor 47, and two groups of first ash guide pipes 48 are connected between the SP boiler 24 and the first chain conveyor 47. The two groups of first ash guide pipes 48 are provided with a first manual gate valve 49, a first rotary feeder 50 and a first soft connection 51 in sequence. The discharge end of the first chain conveyor 47 is provided with a first kiln ash bin 52. The SP boiler system 2 at the kiln tail discharges dusty high-temperature gas through the top outlet of the preheater 23 and enters the SP boiler 24 through the dusty flue gas pipe 28. The dusty high-temperature gas The body exchanges heat with water in the SP boiler 24 to generate superheated steam, and the superheated steam enters the kiln head AQC boiler system 3 through the superheated steam pipe 39, and then flows into the silicon-calcium board production system 1 containing waste heat power generation through the kiln head AQC boiler system 3. The dust in the dust-containing high-temperature gas enters the first chain conveyor 47 through the first manual gate valve 49, the first rotary feeder 50 and the first flexible connection 51 on the first ash guide pipe 48. The first chain conveyor 47 transports the kiln ash to the first kiln ash bin 52 and other places for treatment.

[0078] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The kiln head AQC boiler system 3 has an AQC boiler 53, and the two sides of the AQC boiler 53 are respectively provided with a second blowdown expansion tank 54, a third blowdown expansion tank 55, a low-pressure drum 56 and a high-pressure drum 57;

[0079] The AQC boiler 53 has a common economizer 58, a low-pressure section evaporator 59, a low-pressure section superheater 60, a high-pressure section economizer 61, a high-pressure section evaporator 62, a high-pressure section low-temperature superheater 63 and a high-pressure section high-temperature superheater 64 inside;

[0080] The inlet of the common economizer 58 is connected to a feed water pump 65 , and the outlet of the common economizer 58 is connected to a second water outlet pipe 66 , and the second water outlet pipe 66 is connected to the first water inlet pipe 34 ;

[0081] The inlet and outlet of the low-pressure section evaporator 59 are both connected to the low-pressure drum 56. A third water inlet pipe 67 is connected between the low-pressure drum 56 and the first water inlet pipe 34. The third water inlet pipe 67 is connected in parallel with a kiln head first electric regulating valve 68.

[0082] The low-pressure section superheater 60 is connected to the low-pressure boiler drum 56, and the inlet of the high-pressure section economizer 61 is connected to the first water inlet pipe 34. The first water inlet pipe 34 is provided with an electric water inlet stop valve 69 and a second electric regulating valve 70 in parallel with the kiln head;

[0083] The outlet of the high-pressure section economizer 61 is connected to the high-pressure drum 57, the inlet and outlet of the high-pressure section evaporator 62 are both connected to the high-pressure drum 57, one end of the high-pressure section low-temperature superheater 63 is connected to the high-pressure drum 57, the other end of the high-pressure section low-temperature superheater 63 and one end of the high-pressure section high-temperature superheater 64 are both connected to the hot steam pipe 39, the other end of the high-pressure section high-temperature superheater 64 is connected to the air guide pipe 71, the air guide pipe 71 is connected to the main steam conduit 10, and the air guide pipe 71 is provided with an emergency air release valve 72, a first electric gate valve 73 at the kiln head, a second electric gate valve 74 at the kiln head and a steam turbine room 75;

[0084] The outlet of the second blowdown expansion tank 54 and the outlet of the third blowdown expansion tank 55 are both connected to the first blowdown system 76, the inlet of the second blowdown expansion tank 54 is connected to the low-pressure boiler drum 56, a third electric stop valve 77 is connected between the inlet of the second blowdown expansion tank 54 and the low-pressure boiler drum 56, the inlet of the third blowdown expansion tank 55 is connected to the high-pressure boiler drum 57, and a fourth electric stop valve 78 is connected between the inlet of the third blowdown expansion tank 55 and the high-pressure boiler drum 57;

[0085] The bottom of the AQC boiler 53 is connected to the grate cooler 4. A second chain conveyor 79 is provided at the bottom of the AQC boiler 53. A second ash guide pipe 80 is connected between the AQC boiler 53 and the second chain conveyor 79. A second manual gate valve 81, a second rotary feeder 82 and a second flexible connection 83 are provided on the second ash guide pipe 80 in sequence. A second kiln ash bin 84 is provided at the discharge end of the second chain conveyor 79. The dusty high-temperature gas with a tail temperature of 240°C to 400°C in the grate cooler 4 provided at the lower part of the kiln head AQC boiler system 3 enters the AQC boiler 53. The dusty high-temperature gas exchanges heat with water in the AQC boiler 53 to generate high-temperature saturated steam. The high-temperature saturated steam enters the air guide pipe 71 and is discharged through the emergency release. The gas valve 72, the first electric gate valve 73 at the kiln head and the second electric gate valve 74 at the kiln head are discharged into the turbine room 75 or the main steam duct 10, so as to facilitate the discharge of high-temperature saturated steam into the silicon calcium board production system 1 containing waste heat power generation, wherein the superheated steam from the SP boiler system 2 at the kiln tail enters the AQC boiler system 3 at the kiln head, and the low-temperature saturated steam mixed by the AQC boiler system 3 at the kiln head enters the SP boiler 24 again through the first water inlet pipe 34 for reuse, and the high-temperature saturated steam mixed by the AQC boiler system 3 at the kiln head enters the sub-cylinder 8 through the first stop valve 16 and the first valve 19, and the high-temperature saturated steam is divided into the autoclave 5 and the curing room 6 through the sub-cylinder 8 to realize the curing of the silicon calcium board.

[0086] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 One end of the autoclave 5 is provided with an opening cover 100, and an end of the autoclave 5 close to the opening cover 100 is provided with a steaming trolley 101, which moves along the axial direction of the autoclave 5. The steaming trolley 101 is convenient for delivering the calcium silicon board to be processed into the autoclave 5 for processing. The opening cover 100 achieves a sealing effect and can be opened or closed, which is convenient for the steaming trolley 101 to enter and exit.

[0087] A sewage outlet 102 is disposed on the side of one end of the autoclave 5 away from the cover 100 . The sewage outlet 102 is arranged so that waste water generated in the autoclave 5 can be discharged through the sewage outlet 102 , thereby avoiding affecting the finished products in the autoclave 5 .

[0088] See also Figure 1 , Figure 2 , Figure 3 and Figure 4In this embodiment, the calcium silicate board is a silicate product made of siliceous materials (sand, fly ash and silicon-containing tailings, etc.) and calcium materials (such as quicklime powder, lime paste, slaked lime powder, etc.) as main raw materials, through raw material processing, board stacking demoulding, autoclave curing, edge grinding, chamfering and sanding and other process processes. The autoclave 5 and curing room 6 in its production process require steam and temperature. The waste heat power generation system of the cement plant generally has a kiln tail SP boiler system 2 and a kiln head AQC boiler system 3. The high-temperature exhaust gas at the outlet of the preheater 23 of the kiln tail SP boiler system 2 enters the SP boiler 24 to exchange heat with the first U-shaped tube 31, the second U-shaped tube 32 and the third U-shaped tube 33, and generates superheated steam for waste heat power generation. The dusty high-temperature gas at the outlet of the preheater 23 exchanges heat with water in the SP boiler 24 to generate superheated steam. The exhaust gas after heat exchange goes from the bottom of the SP boiler 24 through the second electric shutter valve 44 on the dusty flue gas branch pipe 43 to the high-temperature fan 26, and finally reaches the exhaust gas treatment workshop for treatment.

[0089] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the water of the SP boiler 24 comes from the common economizer 58 of the AQC boiler 53. The water inlet is regulated by the first electric regulating valve 68 and the second electric regulating valve 70 at the kiln head. The water passes through the SP boiler 24, and the water is heated to generate steam and enters the SP boiler 24 for circulation again. The superheated steam generated by the SP boiler 24 enters the superheated steam pipe 39, and enters the kiln head AQC boiler system 3 through the first electric gate valve 40 and the second electric gate valve 42 at the kiln tail on the superheated steam pipe 39. In case of emergency, the water can be discharged from the outlet of the SP boiler 24. Emergency air release is carried out through the kiln tail silencer 41, and the steam is discharged into the atmosphere through the first electric gate valve 40 and the kiln tail silencer 41 at the kiln tail. The circulating waste water generated in the kiln tail drum 25 is discharged into the first sewage expansion tank 27 through the kiln tail electric regulating valve 46 on the first sewage pipe 45 until it is processed in the sewage treatment system of the cement plant. The dust in the high-temperature gas in the SP boiler 24 enters the first chain conveyor 47 through the first manual gate valve 49, the first rotary feeder 50 and the first soft connection 51. The first chain conveyor 47 transports the kiln ash to the first kiln ash bin 52 for treatment.

[0090] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the flue gas with a tail temperature of 240°C to 400°C in the grate cooler 4 enters the AQC boiler 53, and the dust-containing high-temperature gas exchanges heat with water in the AQC boiler 53 to produce high-temperature saturated steam. The exhaust gas after heat exchange passes from the top of the AQC boiler 53 through the first electric gate valve 103 and the third flexible connection 104 to the first dust collector 105 for exhaust gas treatment.

[0091] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the water of the AQC boiler 53 comes from the feed water pump 65 of the cement plant, and the water intake is controlled by a regulating valve. The water flows in three ways: one way goes to the SP boiler 24; one way goes to the low-pressure drum 56; and one way goes to the high-pressure drum 57. The water is heated by the AQC boiler 53, the low-pressure drum 56 and the high-pressure drum 57 to generate steam, and the generated steam enters the AQC boiler 53 again for circulation. The high-temperature saturated steam of the AQC boiler 53 enters the turbine room 75 through the first electric gate valve 73 at the kiln head of the air guide pipe 71 or enters the main steam conduit 10 in the silicon calcium board production system 1 containing waste heat power generation through the second electric gate valve 74 at the kiln head of the air guide pipe 71.

[0092] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the high-temperature saturated steam from the AQC boiler 53 uses the first stop valve 16 to control the steam flow direction. Under normal circumstances, the second stop valve 18 on the emergency vent pipe 17 is closed, and the steam enters the calcium silicon board production process through the first stop valve 16. In case of an emergency in production, the first stop valve 16 is quickly closed and the second stop valve 18 on the emergency vent pipe 17 is opened to ensure safe production.

[0093] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the unstable saturated steam is controlled by the temperature reducer 12 so that the steam stabilizes at a temperature of 100°C to 220°C and a pressure of 0.8Mpa to 1.5Mpa. After the steam stabilizes, it enters the autoclave 5 to achieve stable production. In order to ensure that there is enough oxygen in the curing room 6 for people to breathe, a cold air valve 15 is provided to perform secondary regulation of the oxygen intake and the temperature in the curing room 6. The first pressure relief valve 13 and the second pressure relief valve 14 are used to ensure safe manual pressure relief in an emergency.

[0094] Embodiment 2

[0095] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , combined with the first embodiment, in the absence of waste heat power generation, one end of the waste heat power generation calcium silicon board production system 1 is provided with a steam generator 85, a high temperature boiler 86, and a fourth sewage expansion tank 87;

[0096] The high-temperature gas at the outlet of the preheater 23 and the flue gas with a tail temperature of 240°C to 400°C in the grate cooler 4 enter the steam generator 85 together. The water inside the high-temperature boiler 86 circulates inside the steam generator 85 and returns to the high-temperature boiler 86. In this way, the high-temperature boiler 86 is water when it enters the steam generator 85, and what comes out of the steam generator 85 and returns to the high-temperature boiler 86 is saturated steam. The saturated steam in the high-temperature boiler 86 passes through the steam generator 85 and is introduced into the main steam conduit 10 in the silicon-calcium board production system 1 containing waste heat power generation.

[0097] The high-temperature boiler 86 is connected to the fourth sewage expansion tank 87 by a pipeline, and a switch valve 88 is provided on the pipeline. The outlet of the fourth sewage expansion tank 87 is connected to the second sewage system 89. When the water in the high-temperature boiler 86 circulates many times and needs to be replaced, the switch valve 88 is opened, and the waste water in the high-temperature boiler 86 flows into the fourth sewage expansion tank 87, and then discharged to the second sewage system 89 through the fourth sewage expansion tank 87 for treatment.

[0098] The exhaust gas after heat exchange inside the steam generator 85 is sent from the top of the steam generator 85 through the second electric gate valve 90 and the fourth flexible connection 91 to the second dust collector 92 for exhaust gas treatment.

[0099] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In this embodiment, an air cooling valve 93 for blowing air is provided on the pipeline from the grate cooler 4 to the steam generator 85 to prevent dusty flue gas with excessively high temperature from entering the steam generator 85 .

[0100] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 In this embodiment, a third chain conveyor 94 is provided at the bottom of the steam generator 85, and a third ash guide pipe 95 is connected between the steam generator 85 and the third chain conveyor 94. The third ash guide pipe 95 is provided with a third manual gate valve 96, a third rotary discharger 97 and a fifth soft connection 98 in sequence, and a third ash bin 99 is provided at the discharge end of the third chain conveyor 94. The ash generated in the steam generator 85 enters the third chain conveyor 94 through the third manual gate valve 96, the third rotary discharger 97 and the fifth soft connection 98, and the third chain conveyor 94 transports the ash to the third ash bin 99 for processing.

[0101] The beneficial effects of embodiment 1 and embodiment 2 in this technical solution are as follows:

[0102] 1. Diversified economic benefits of cement plants. The economic benefits of producing cement products will be greatly increased if the excess heat of cement plants is used for power generation rather than for producing high value-added cement products.

[0103] 2. Reduce production costs. The raw materials in the production of calcium silicate board are mainly cement and lime, and the auxiliary materials are sand, fly ash and silicon-containing tailings. Using the waste heat of cement to generate steam can not only solve the temperature and steam problems required for equipment and maintenance in the production process of calcium silicate board, but also some raw materials and cement in the cement plant are also the raw materials of calcium silicate board. Joint production in the cement plant can reduce the transportation cost of raw materials, the fuel cost of steam combustion, the cost of boiler construction and operation and maintenance costs.

[0104] 3. Industrial integration for energy conservation and environmental protection, formulate integrated production plans for cement and calcium silicate board products to promote industrial resource sharing and complementary capabilities, form positive feedback, achieve the goal of reducing comprehensive costs through improved production efficiency, and enhance the company's market competitiveness. At the same time, the integrated industry shares sewage and waste gas treatment systems to achieve the goal of energy conservation and environmental protection. For example, the waste gas in the production process of calcium silicate boards can share the waste gas treatment system of the cement production line.

[0105] 4. Improved process layout flexibility: In order to improve the efficiency of waste heat power generation, waste heat power generation needs to be built close to the heat source. Now, new layout solutions can be provided for waste heat utilization in cement plants to improve the flexibility of process layout.

[0106] 5. Multi-stage utilization of waste heat from cement kilns. The waste heat from cement kilns comes from the C1 outlet of the preheater 23 and the grate cooler 4. The waste gas temperature of the grate cooler 4 is between 0℃ and 1200℃, and the waste gas is sent to the kiln and the decomposition furnace through the secondary and tertiary air ducts respectively; the waste gas temperature is between 400℃ and 800℃, and enters the waste heat power generation system; the waste gas temperature is between 300℃ and 500℃, and can enter the coal mill, the raw material drying system, and the steam generator 85; the waste gas temperature is between 200℃ and 400℃, and can enter the steam generator 85 to produce silicon calcium board. The waste gas temperature at the C1 outlet of the preheater 23 is between 260℃ and 350℃, and can enter the waste heat power generation system, the steam generator 85, and the silicon calcium board curing room 6.

[0107] 6. Cement plant transformation: For cement plants with a daily production capacity of less than 5,000 tons and no waste heat power generation system, it can fully utilize energy and improve economic benefits.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A process method for producing calcium silicate board using cement waste heat, characterized in that: It comprises a waste heat power generation calcium silicon board production system (1); One end of the waste heat power generation calcium silicon board production system (1) is provided with a kiln tail SP boiler system (2), a kiln head AQC boiler system (3) and a grate cooler (4); the superheated steam generated by the kiln tail SP boiler system (2) enters the kiln head AQC boiler system (3); the flue gas at the tail of the grate cooler (4) enters the kiln head AQC boiler system (3); the high-temperature saturated steam is mixed in the kiln head AQC boiler system (3) and introduced into the waste heat power generation calcium silicon board production system (1); The waste heat power generation calcium silicon board production system (1) is provided with an autoclave (5) and a curing room (6), and the high-temperature saturated steam mixed in the kiln head AQC boiler system (3) is introduced into the autoclave (5) and the curing room (6).

2. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 1 is characterized in that: A first steam conduit (7) is provided at one end of the autoclave (5), one end of the first steam conduit (7) is connected to the autoclave (5), one end of the first steam conduit (7) away from the autoclave (5) is connected to a steam sub-cylinder (8), a second steam conduit (9) is connected between the curing chamber (6) and the steam sub-cylinder (8), one end of the steam sub-cylinder (8) is connected to a main steam conduit (10), and one end of the main steam conduit (10) away from the autoclave (5) and the curing chamber (6) is connected to the kiln head AQC boiler system (3); The main steam conduit (10) is connected to a secondary steam conduit (11), and one end of the secondary steam conduit (11) away from the main steam conduit (10) is connected to the first steam conduit (7) and the second steam conduit (9) in sequence.

3. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 2 is characterized in that: A temperature and pressure reducing device (12) is provided on the first steam conduit (7), and the temperature and pressure reducing device (12) is in communication with the first steam conduit (7).

4. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 3 is characterized in that: The first steam conduit (7) between the autoclave (5) and the temperature and pressure reducing device (12) is provided with a first pressure relief valve (13), and the second steam conduit (9) is provided with a second pressure relief valve (14).

5. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 1 is characterized in that: The internal temperature of the curing room (6) is 50°C to 70°C, and the internal humidity of the curing room (6) is 85% to 95%.

6. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 2 is characterized in that: A cold air valve (15) is provided at one end of the curing chamber (6) close to the steam cylinder (8), and the cold air valve (15) is connected to the second steam conduit (9) along the radial direction of the second steam conduit (9).

7. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 2 is characterized in that: A first stop valve (16) is provided at one end of the main steam conduit (10) close to the kiln head AQC boiler system (3), and the first stop valve (16) is fixedly connected to the main steam conduit (10); An end of the first stop valve (16) close to the kiln head AQC boiler system (3) is radially connected to an emergency vent pipe (17), and a second stop valve (18) is provided on the emergency vent pipe (17).

8. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 7 is characterized in that: A first valve (19), a second valve (20), a third valve (21) and a fourth valve (22) are provided at one end of the main steam conduit (10) close to the sub-cylinder (8), wherein the first valve (19) is connected to the main steam conduit (10) between the first stop valve (16) and the sub-cylinder (8); The second valve (20), the third valve (21) and the fourth valve (22) are all connected to the secondary steam conduit (11), the second valve (20) is close to the first valve (19), the third valve (21) is close to the intersection of the first steam conduit (7) and the secondary steam conduit (11), and the fourth valve (22) is close to the second steam conduit (9).

9. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 2 is characterized in that: The kiln tail SP boiler system (2) comprises a preheater (23), an SP boiler (24), a kiln tail drum (25), a high temperature fan (26) and a first blowdown expansion tank (27); A dusty flue gas pipe (28) is connected between the top end of the preheater (23) and the SP boiler (24); a dusty flue gas branch pipe (29) is connected in the radial direction of the dusty flue gas pipe (28); a first electric shutter valve (30) is installed on the dusty flue gas branch pipe (29); and the high-temperature fan (26) is connected to an end of the dusty flue gas branch pipe (29) away from the dusty flue gas pipe (28); The SP boiler (24) has a first U-shaped tube (31), a second U-shaped tube (32) and a third U-shaped tube (33) inside, the inlet of the first U-shaped tube (31) is connected to a first water inlet pipe (34), the outlet of the first U-shaped tube (31) is connected to a first water outlet pipe (35), and the first water outlet pipe (35) is connected to the kiln tail drum (25); The inlet of the second U-shaped tube (32) is connected to a second water inlet pipe (36), the second water inlet pipe (36) is connected to the kiln tail drum (25), and the outlet of the second U-shaped tube (32) is connected to a saturated steam outlet pipe (37), the saturated steam outlet pipe (37) is connected to the kiln tail drum (25); The inlet of the third U-shaped tube (33) is connected to a saturated steam introduction pipe (38), the saturated steam introduction pipe (38) is connected to the kiln tail drum (25), the outlet of the third U-shaped tube (33) is connected to a superheated steam pipe (39), and the superheated steam pipe (39) is provided with a first kiln tail electric gate valve (40), a kiln tail silencer (41) and a second kiln tail electric gate valve (42); A dusty flue gas branch pipe (43) is connected between the bottom of the SP boiler (24) and the dusty flue gas branch pipe (29), and a second electric shutter valve (44) is installed on the dusty flue gas branch pipe (43); A first sewage pipe (45) is connected between the kiln tail drum (25) and the first sewage expansion container (27), and a kiln tail electric regulating valve (46) is installed on the first sewage pipe (45); A first chain conveyor (47) is provided at the bottom end of the SP boiler (24), and two groups of first ash guide pipes (48) are connected between the SP boiler (24) and the first chain conveyor (47). The two groups of the first ash guide pipes (48) are provided with a first manual gate valve (49), a first rotary discharger (50) and a first flexible connection in sequence, and a first kiln ash bin (52) is provided at the discharge end of the first chain conveyor (47).

10. The process method for producing calcium silicate board by utilizing cement waste heat according to claim 9, characterized in that: The kiln head AQC boiler system (3) comprises an AQC boiler (53), and two sides of the AQC boiler (53) are respectively provided with a second blowdown expansion tank (54), a third blowdown expansion tank (55), a low-pressure boiler drum (56) and a high-pressure boiler drum (57); The AQC boiler (53) has a common economizer (58), a low-pressure section evaporator (59), a low-pressure section superheater (60), a high-pressure section economizer (61), a high-pressure section evaporator (62), a high-pressure section low-temperature superheater (63) and a high-pressure section high-temperature superheater (64) inside; The inlet of the common economizer (58) is connected to a feed water pump (65), the outlet of the common economizer (58) is connected to a second water outlet pipe (66), and the second water outlet pipe (66) is connected to the first water inlet pipe (34); The inlet and outlet of the low-pressure section evaporator (59) are both connected to the low-pressure drum (56); a third water inlet pipe (67) is connected between the low-pressure drum (56) and the first water inlet pipe (34); and a first electric regulating valve (68) at the kiln head is connected in parallel to the third water inlet pipe (67); The low-pressure section superheater (60) is connected to the low-pressure boiler drum (56), and the inlet of the high-pressure section economizer (61) is connected to the first water inlet pipe (34). The first water inlet pipe (34) is provided with an electric water inlet stop valve (69) and a second electric regulating valve (70) at the kiln head in parallel; The outlet of the high-pressure section economizer (61) is connected to the high-pressure drum (57), the inlet and outlet of the high-pressure section evaporator (62) are both connected to the high-pressure drum (57), one end of the high-pressure section low-temperature superheater (63) is connected to the high-pressure drum (57), the other end of the high-pressure section low-temperature superheater (63) and one end of the high-pressure section high-temperature superheater (64) are both connected to the superheated steam pipe (39), the other end of the high-pressure section high-temperature superheater (64) is connected to an air guide pipe (71), the air guide pipe (71) is connected to the main steam conduit (10), and the air guide pipe (71) is provided with an emergency air release valve (72), a first electric gate valve (73) at the kiln head, a second electric gate valve (74) at the kiln head, and a steam turbine room (75); The outlet of the second blowdown expansion tank (54) and the outlet of the third blowdown expansion tank (55) are both connected to a first blowdown system (76); the inlet of the second blowdown expansion tank (54) is connected to the low-pressure boiler drum (56); a third electric stop valve (77) is connected between the inlet of the second blowdown expansion tank (54) and the low-pressure boiler drum (56); the inlet of the third blowdown expansion tank (55) is connected to the high-pressure boiler drum (57); a fourth electric stop valve (78) is connected between the inlet of the third blowdown expansion tank (55) and the high-pressure boiler drum (57); The bottom of the AQC boiler (53) is connected to the grate cooler (4); a second chain conveyor (79) is provided at the bottom of the AQC boiler (53); a second ash guide pipe (80) is connected between the AQC boiler (53) and the second chain conveyor (79); a second manual gate valve (81), a second rotary discharger (82) and a second flexible connection (83) are provided on the second ash guide pipe (80) in sequence; and a second kiln ash bin (84) is provided at the discharge end of the second chain conveyor (79).

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