Technological process method for producing aerated concrete by using waste heat of cement

Abstract

The invention relates to the technical field of cement kiln waste heat utilization, aims to solve the problems that in the prior art, waste heat utilization is poor in economic benefit, serious in heat energy waste, large in investment, long in cost recovery time and incapable of achieving heat energy diversified production, and provides a technological process method for producing aerated concrete through cement waste heat. Comprising a grate cooler, a kiln head AQC boiler system, a kiln tail SP boiler system and a waste heat-containing power generation aerated concrete production system, superheated steam of the kiln tail SP boiler system and high-temperature flue gas of the grate cooler enter the kiln head AQC boiler system and are mixed into high-temperature saturated steam, and the high-temperature saturated steam is guided into the waste heat-containing power generation aerated concrete production system; the waste heat-containing power generation aerated concrete production system comprises a still kettle, a slurry stirrer and a curing chamber, wherein high-temperature saturated steam is respectively guided into the still kettle, the slurry stirrer and the curing chamber. The invention has the beneficial effects of energy saving, environmental protection, good economic benefit, high heat energy utilization rate, small investment, fast cost recovery and diversified production.

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 aerated concrete by utilizing cement waste heat. Background Art

[0002] At present, in the process of cement production, cement plants will produce high-temperature flue gas at the kiln tail, and grate coolers will also produce high-temperature waste heat. These waste heat are generally used for power generation in cement plants, but the economic benefits of using waste heat only for power generation are not high, and the cost of power generation equipment is high, the investment is large, and it is difficult to recover the return in a short time. If you want to recover the cost in a short time and improve the efficiency of waste heat power generation, you need to seek diversified production of thermal energy. In the existing technology, aerated concrete production requires a lot of waste heat to heat water to generate high-temperature steam. High-temperature steam helps aerated concrete mixing, aerated concrete component maintenance and aerated concrete component structure strengthening during the production of aerated concrete. However, aerated concrete production and cement plant waste heat utilization cannot be combined with each other. Therefore, how to increase aerated concrete production in cement plants to improve energy utilization efficiency and how to increase economic benefits for cement plants are urgent problems that need to be solved. Summary of the invention

[0003] The present invention aims to provide a process method for producing aerated concrete using waste heat from cement, so as to solve the problems in the prior art of poor economic benefits of waste heat utilization, serious waste of heat energy, large investment, long cost recovery time and inability to diversify heat energy production.

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

[0005] The embodiment of the present invention provides a process method for producing aerated concrete using cement waste heat, which includes a grate cooler;

[0006] The grate cooler is connected to the kiln head AQC boiler system, and the kiln head AQC boiler system is respectively connected to the kiln tail SP boiler system and the waste heat power generation aerated concrete production system;

[0007] The superheated steam generated by the above-mentioned SP boiler system at the kiln tail enters the above-mentioned AQC boiler system at the kiln head, and the high-temperature flue gas at the tail of the above-mentioned grate cooler enters the above-mentioned AQC boiler system at the kiln head. The above-mentioned AQC boiler system at the kiln head is mixed to form high-temperature saturated steam and low-temperature saturated steam. The high-temperature saturated steam is introduced into the above-mentioned aerated concrete production system containing waste heat power generation, and the low-temperature saturated steam is introduced into the above-mentioned SP boiler system at the kiln tail for repeated use;

[0008] The above-mentioned aerated concrete production system containing waste heat power generation has an autoclave, a slurry agitator and a curing room. The high-temperature saturated steam in the above-mentioned kiln head AQC boiler system is respectively introduced into the above-mentioned autoclave, the above-mentioned slurry agitator and the above-mentioned curing room.

[0009] The present embodiment discloses a process method for producing aerated concrete by utilizing waste heat of cement. Due to the addition of an aerated concrete production system containing waste heat power generation in the cement plant, the superheated steam generated by the SP boiler system at the tail of the kiln and the high-temperature flue gas at the tail of the grate cooler are introduced into the AQC boiler system at the head of the kiln to mix and form high-temperature saturated steam, and aerated concrete production is achieved through the high-temperature saturated steam. This allows the excess waste heat of the cement plant to be used not only for power generation but also for the production of aerated concrete, further improving the economic benefits of the cement plant, thereby making the process method for producing aerated concrete by utilizing waste heat of cement have the beneficial effects of energy saving and environmental protection, good economic benefits, high thermal energy utilization rate, small investment, fast cost recovery and diversified production.

[0010] Optionally: the autoclave, the slurry agitator and the curing room are provided with a first steam conduit at one end close to the kiln head AQC boiler system, one end of the first steam conduit is connected to the kiln head AQC boiler system, a steam sub-cylinder is provided at the other end of the first steam conduit, an auxiliary steam conduit is provided between the air inlet end of the steam sub-cylinder and the first steam conduit, the air inlet end of the steam sub-cylinder is connected to one end of the auxiliary steam conduit, the other end of the auxiliary steam conduit is connected to the first steam conduit, and the autoclave, the slurry agitator and the curing room are all connected to the steam sub-cylinder.

[0011] With such arrangement, the high-temperature saturated steam from the kiln head AQC boiler system can enter the steam sub-cylinder through the first steam conduit, and the steam sub-cylinder respectively introduces the high-temperature saturated steam into the autoclave, the slurry agitator or the curing room through the second steam conduit, the third steam conduit and the fourth steam conduit. The auxiliary steam conduit allows the high-temperature saturated steam from the AQC boiler system to directly enter the steam sub-cylinder. When the high-temperature saturated steam runs stably, the high-temperature saturated steam can go directly to the autoclave, the slurry agitator and the curing room without passing through the steam sub-cylinder. When the high-temperature saturated steam from the kiln head AQC boiler system is unstable, the high-temperature saturated steam is introduced into the steam sub-cylinder, and the high-temperature saturated steam with stable pressure is stably outputted through the steam sub-cylinder to the autoclave, the slurry agitator and the curing room, thereby facilitating the production of aerated concrete, facilitating the curing of components formed by aerated concrete, and facilitating the improvement of the strength of components formed by aerated concrete.

[0012] Optionally: a second steam conduit is connected between the autoclave and the steam sub-cylinder, the second steam conduit is cross-connected with the first steam conduit, a first temperature-reducing and pressure-reducing device and a first pressure relief valve are arranged on the second steam conduit, the first temperature-reducing and pressure-reducing device is close to the steam sub-cylinder, and the first pressure relief valve is close to the autoclave;

[0013] The outer wall of the autoclave is provided with an autoclave inlet and a sewage outlet, and one end of the second steam conduit close to the autoclave is connected to the autoclave inlet.

[0014] With such arrangement, the second steam conduit can introduce high-temperature saturated steam into the autoclave, which is convenient for improving the strength of the components formed by aerated concrete. By cross-connecting with the first steam conduit, the high-temperature saturated steam does not pass through the steam cylinder but is directly introduced into the autoclave. The unstable high-temperature saturated steam is controlled by the first temperature reducer and pressure reducer to stabilize the steam temperature at 100°C to 220°C and the pressure at 0.8Mpa to 1.5Mpa, which is beneficial for controlling the temperature and pressure inside the autoclave and ensuring the quality of the finished aerated concrete components. The first pressure relief valve can relieve pressure, which is convenient for emergency relief of the high-temperature saturated steam inside the second steam conduit, and can ensure the safety of the pressure relief personnel in an emergency.

[0015] Optionally: a third steam conduit is connected between the steam sub-cylinder and the slurry agitator, the third steam conduit is cross-connected with the first steam conduit, a second temperature and pressure reducer and a second pressure relief valve are sequentially provided at one end of the third steam conduit close to the slurry agitator, and the second pressure relief valve is close to the slurry agitator.

[0016] With such arrangement, the third steam conduit can not only introduce the high-temperature saturated steam into the slurry agitator through the steam cylinder to facilitate the mixing of aerated concrete, but also allow the high-temperature saturated steam to be directly introduced into the slurry agitator through the first steam conduit and the third steam conduit. The second pressure relief valve facilitates pressure relief. When encountering a production emergency, such as when the slurry foams too quickly, the second pressure relief valve will serve as an effective control means to quickly stop the input of high-temperature saturated steam.

[0017] Optionally: a fourth steam conduit is connected between the curing room and the steam cylinder, the fourth steam conduit is connected to the other end of the first steam conduit, a third pressure relief valve and a cold air valve are sequentially provided at one end of the fourth steam conduit close to the curing room, and the cold air valve is close to the curing room.

[0018] With such arrangement, the fourth steam conduit can not only introduce the high-temperature saturated steam into the curing room through the steam cylinder, which is convenient for curing the aerated concrete components, but also introduce the high-temperature saturated steam directly into the curing room through the first steam conduit and the fourth steam conduit. The cold air valve can perform secondary adjustment on the oxygen and humidity inside the curing room, which can ensure that there is enough oxygen inside the curing room for people to breathe, and the third pressure relief valve can quickly release the high-temperature saturated steam inside the fourth steam conduit, thereby facilitating the staff to enter and exit the curing room for work.

[0019] Optionally: the first steam conduit and the sub steam conduit are provided with a first valve, a second valve, a third valve and a fourth valve;

[0020] The first valve is located on the secondary steam conduit, and the second valve is located on the first steam conduit between the secondary steam conduit and the second steam conduit;

[0021] The third valve is located on the first steam conduit between the second steam conduit and the third steam conduit;

[0022] The fourth valve is located on the first steam conduit between the third steam conduit and the fourth steam conduit.

[0023] With such arrangement, 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 first steam duct. 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, the material agitator 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, the material agitator 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 and the slurry agitator.

[0024] Optionally: the internal temperature of the above-mentioned autoclave is 100°C to 220°C, and the internal pressure of the above-mentioned autoclave is 0.8 Mpa to 1.5 Mpa;

[0025] The internal temperature of the slurry stirrer is 50°C to 90°C, and the internal pressure of the slurry stirrer is 0.2Mpa to 0.8Mpa;

[0026] The internal temperature of the above-mentioned maintenance chamber is 20°C to 50°C, and the internal humidity of the above-mentioned maintenance chamber is 90% or more.

[0027] With such arrangement, the temperature and pressure range of the autoclave can strengthen the structure of the components produced by aerated concrete and ensure the quality of the finished products; the temperature and pressure range of the slurry agitator can fully stir the aerated concrete, and by controlling the humidity and temperature inside the curing chamber, the components made of aerated concrete placed inside the curing chamber can be effectively cured, which is conducive to the production of qualified components made of aerated concrete.

[0028] Optionally: a first stop valve is provided on one end of the first steam conduit close to the kiln head AQC boiler system, and the first stop valve is fixedly connected to the first steam conduit;

[0029] 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.

[0030] In this way, the first stop valve can control the high-temperature saturated steam to enter the autoclave, the steam cylinder, the slurry agitator 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 facilitate rapid pressure relief and ensure safe production.

[0031] 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;

[0032] 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;

[0033] 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;

[0034] 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;

[0035] 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.

[0036] 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;

[0037] 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;

[0038] 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.

[0039] 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 aerated concrete 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.

[0040] 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;

[0041] 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;

[0042] 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;

[0043] 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;

[0044] 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;

[0045] 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 first 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;

[0046] 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;

[0047] 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.

[0048] 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 exchanges heat 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 steam turbine room or the first 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 high-temperature saturated steam to be discharged into the aerated concrete production system 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, the slurry agitator and the curing room through the steam distribution cylinder, thereby facilitating the production of components made of aerated concrete.

[0049] Optionally, a curing trolley is provided inside the autoclave, and the curing trolley can be slidably adapted to fit inside the autoclave.

[0050] With such arrangement, the curing trolley is convenient for delivering the aerated concrete components to be processed into the autoclave for structural reinforcement, and the finished products are convenient for transportation and packaging.

[0051] Optionally, one end of the autoclave is provided with an end cover, the end cover is hingedly connected to the one end of the autoclave and is detachably sealed with the autoclave.

[0052] With such arrangement, the end cover achieves a sealing effect and can be opened or closed, so that the steaming trolley can be easily entered and exited.

[0053] In summary, the process method for producing aerated concrete by utilizing cement waste heat disclosed in the present invention has the beneficial effects of energy saving and environmental protection, good economic benefits, high thermal energy utilization rate, small investment, fast cost recovery and diversified production. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] 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.

[0055] Figure 1 This is a process flow chart of waste heat power generation in a process method for producing aerated concrete using waste heat of cement according to an embodiment of the present invention;

[0056] Figure 2 It is a process flow chart of the aerated concrete production system containing waste heat power generation in an embodiment of the present invention;

[0057] Figure 3 It is a process flow chart of the SP boiler system at the kiln tail in an embodiment of the present invention;

[0058] Figure 4 It is a process flow chart of the kiln head AQC boiler system in an embodiment of the present invention;

[0059] Figure 5 This is a process flow chart of power generation without waste heat in the second embodiment of the present invention.

[0060] Icons: 1-grate cooler, 2-kiln head AQC boiler system, 3-kiln tail SP boiler system, 4-waste heat power generation aerated concrete production system, 5-autoclave, 6-slurry agitator, 7-curing room, 8-first steam duct, 9-sub-cylinder, 10-auxiliary steam duct, 11-second steam duct, 12-first temperature and pressure reducer, 13-first pressure relief valve, 14-autoclave inlet, 15-drain pipe outlet, 16-third steam duct, 17-second temperature and pressure reducer, 18-second pressure relief valve, 19-fourth steam duct, 20-third pressure relief valve, 21-cold air valve, 23-preheater, 24-SP boiler, 25-kiln tail drum, 26-high temperature fan, 27-first sewage expansion tank, 28-dust 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- saturated steam outlet pipe, 38- saturated steam inlet pipe, 39- superheated steam pipe, 40- first electric gate valve at the end of kiln, 41- silencer at the end of kiln, 42- second electric gate valve at the end of kiln, 43- dusty flue gas branch pipe, 44- second electric shutter valve, 45- first sewage pipe, 46- electric regulating valve at the end of 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- The second sewage expansion tank, 55-the third sewage expansion tank, 56-low-pressure boiler drum, 57-high-pressure boiler 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-the second outlet pipe, 67-the third inlet pipe, 68-the first electric regulating valve at the kiln head, 69-electric water inlet stop valve, 70-the second electric regulating valve at the kiln head, 71-air guide pipe, 72-emergency air release valve, 73-the first electric gate valve at the kiln head, 74-the second electric gate valve at the kiln head, 75-turbine room, 76-the first sewage system, 77-the third electric stop valve, 78-the fourth electric stop valve valve, 79-second chain conveyor, 80-second ash guide pipe, 81-second manual gate valve, 82-second rotary feeder, 83-second soft 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 soft 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 soft connection, 99-third kiln ash bin, 103-first electric gate valve, 104-third soft connection, 105-first dust collector, 106-first valve, 107-second valve,108-the third valve, 109-the fourth valve, 110-the first stop valve, 111-the emergency vent pipe, 112-the second stop valve, 113-the steaming trolley, 114-the end cover. DETAILED DESCRIPTION

[0061] 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.

[0062] 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.

[0063] Example

[0064] 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 aerated concrete using waste heat from cement, including a grate cooler 1;

[0065] The grate cooler 1 is connected to the kiln head AQC boiler system 2, and the kiln head AQC boiler system 2 is respectively connected to the kiln tail SP boiler system 3 and the waste heat power generation aerated concrete production system 4;

[0066] The superheated steam generated by the SP boiler system 3 at the kiln tail enters the AQC boiler system 2 at the kiln head, and the high-temperature flue gas at the tail of the grate cooler 1 enters the AQC boiler system 2 at the kiln head. The high-temperature saturated steam and the low-temperature saturated steam are mixed in the AQC boiler system 2 at the kiln head to form high-temperature saturated steam and low-temperature saturated steam. The high-temperature saturated steam is introduced into the aerated concrete production system 4 containing waste heat power generation, and the low-temperature saturated steam is introduced into the SP boiler system 3 at the kiln tail for repeated use.

[0067] The waste heat power generation aerated concrete production system 4 comprises an autoclave 5, a slurry agitator 6 and a curing chamber 7. The high-temperature saturated steam in the kiln head AQC boiler system 2 is respectively introduced into the autoclave 5, the slurry agitator 6 and the curing chamber 7.

[0068] The present embodiment discloses a process method for producing aerated concrete by utilizing waste heat of cement. Due to the addition of a waste heat power generation aerated concrete production system 4 in the cement plant, the superheated steam generated by the SP boiler system 3 at the tail of the kiln and the high-temperature flue gas at the tail of the grate cooler 1 are introduced into the AQC boiler system 2 at the head of the kiln to mix and form high-temperature saturated steam, and aerated concrete production is achieved through the high-temperature saturated steam. This allows the excess waste heat of the cement plant to be used not only for power generation but also for the production of aerated concrete, further improving the economic benefits of the cement plant, thereby making the process method for producing aerated concrete by utilizing waste heat of cement have the beneficial effects of energy saving and environmental protection, good economic benefits, high thermal energy utilization rate, small investment, fast cost recovery and diversified production.

[0069] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The autoclave 5, the slurry agitator 6 and the curing room 7 are provided with a first steam conduit 8 at one end close to the kiln head AQC boiler system 2. One end of the first steam conduit 8 is connected to the kiln head AQC boiler system 2. A sub-cylinder 9 is provided at the other end of the first steam conduit 8. A secondary steam conduit 10 is provided between the air inlet end of the sub-cylinder 9 and the first steam conduit 8. The air inlet end of the sub-cylinder 9 is connected to one end of the secondary steam conduit 10. The other end of the secondary steam conduit 10 is connected to the first steam conduit 8. The autoclave 5, the slurry agitator 6 and the curing room 7 are all connected to the sub-cylinder 9. In this way, the high-temperature saturated steam from the kiln head AQC boiler system 2 can enter the sub-cylinder 9 through the first steam conduit 8, and the sub-cylinder 9 passes through the second steam conduit 11 and the third steam conduit 12. 6 and the fourth steam conduit 19 introduce the high-temperature saturated steam into the autoclave 5 or the slurry agitator 6 or the curing chamber 7 respectively, and the auxiliary steam conduit 10 allows the high-temperature saturated steam from the AQC boiler system to directly enter the sub-cylinder 9. When the high-temperature saturated steam runs stably, the high-temperature saturated steam can go directly to the autoclave 5, the slurry agitator and the curing chamber 7 without passing through the sub-cylinder; when the high-temperature saturated steam from the kiln head AQC boiler system 2 is unstable, the high-temperature saturated steam is introduced into the sub-cylinder, and the high-temperature saturated steam with stable pressure is stably output through the sub-cylinder to the autoclave 5, the slurry agitator and the curing chamber 7, thereby facilitating the production of aerated concrete, facilitating the curing of components formed by aerated concrete, and facilitating the improvement of the strength of components formed by aerated concrete.

[0070] See also Figure 1 , Figure 2 , Figure 3 and Figure 4A second steam conduit 11 is connected between the autoclave 5 and the steam sub-cylinder 9. The second steam conduit 11 is cross-connected with the first steam conduit 8. A first temperature-reducing and pressure-reducing device 12 and a first pressure relief valve 13 are provided on the second steam conduit 11. The first temperature-reducing and pressure-reducing device 12 is close to the steam sub-cylinder 9, and the first pressure relief valve 13 is close to the autoclave 5.

[0071] The outer wall of the autoclave 5 is provided with an autoclave inlet 14 and a sewage outlet 15. The second steam conduit 11 is connected to the autoclave inlet 14 at one end close to the autoclave 5. The second steam conduit 11 can introduce high-temperature saturated steam into the autoclave 5, so as to improve the strength of the components formed by aerated concrete. By cross-connecting with the first steam conduit 8, the high-temperature saturated steam is directly introduced into the autoclave 5 instead of passing through the steam cylinder 9. The unstable high-temperature saturated steam is controlled by the first 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 and ensure the quality of the finished aerated concrete components. The first pressure relief valve 13 can relieve pressure, so as to urgently release the high-temperature saturated steam inside the second steam conduit 11, so as to ensure the safety of the pressure relief personnel in an emergency.

[0072] In this embodiment, the autoclave inlet 14 is convenient for connecting to the second steam conduit 11, thereby facilitating the introduction of high-temperature saturated steam. The setting of the sewage outlet 15 allows the waste water generated in the autoclave 5 to be discharged through the sewage outlet 15, thereby avoiding affecting the finished product in the autoclave 5.

[0073] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A third steam conduit 16 is connected between the steam sub-cylinder 9 and the slurry agitator 6. The third steam conduit 16 and the first steam conduit 8 are cross-connected with each other. A second temperature and pressure reducer 17 and a second pressure relief valve 18 are provided in sequence at one end of the third steam conduit 16 close to the slurry agitator 6. The second pressure relief valve 18 is close to the slurry agitator 6. The third steam conduit 16 can not only introduce high-temperature saturated steam into the slurry agitator 6 through the steam sub-cylinder 9 to facilitate the mixing of aerated concrete, but also allow high-temperature saturated steam to be directly introduced into the slurry agitator 6 through the first steam conduit 8 and the third steam conduit 16. The second pressure relief valve 18 facilitates pressure relief. When encountering a production emergency, such as when the slurry foams too quickly, the second pressure relief valve 18 will serve as an effective control means to quickly stop the input of high-temperature saturated steam.

[0074] See also Figure 1 , Figure 2 , Figure 3 and Figure 4A fourth steam conduit 19 is connected between the curing chamber 7 and the steam sub-cylinder 9. The fourth steam conduit 19 is communicated with the other end of the first steam conduit 8. A third pressure relief valve 20 and a cold air valve 21 are sequentially arranged at one end of the fourth steam conduit 19 close to the curing chamber 7. The cold air valve 21 is close to the curing chamber 7. The fourth steam conduit 19 can not only introduce high-temperature saturated steam into the curing chamber 7 through the steam sub-cylinder 9, which is convenient for curing aerated concrete components, but also allow high-temperature saturated steam to be directly introduced into the curing chamber 7 through the first steam conduit 8 and the fourth steam conduit 19. The cold air valve 21 can perform secondary regulation on the oxygen and humidity inside the curing chamber 7, and can ensure that there is enough oxygen inside the curing chamber 7 for people to breathe. The third pressure relief valve 20 can quickly release the high-temperature saturated steam inside the fourth steam conduit 19, thereby facilitating the staff to enter and exit the curing chamber 7 for work.

[0075] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 , a first valve 106, a second valve 107, a third valve 108 and a fourth valve 109 are provided on the first steam conduit 8 and the auxiliary steam conduit 10;

[0076] The first valve 106 is located on the secondary steam conduit 10, and the second valve 107 is located on the first steam conduit 8 between the secondary steam conduit 10 and the second steam conduit 11;

[0077] The third valve 108 is located on the first steam conduit 8 between the second steam conduit 11 and the third steam conduit 16;

[0078] The fourth valve 109 is located on the first steam conduit 8 between the third steam conduit 16 and the fourth steam conduit 19. The first valve 106, the second valve 107, the third valve 108 and the fourth valve 109 can control the flow route of the high-temperature saturated steam in the first steam conduit 8. When the first valve 106 is closed, the second valve 107, the third valve 108 and the fourth valve 109 are opened, and the high-temperature saturated steam of the kiln head AQC boiler system 2 directly enters the autoclave 5, the material agitator and the curing chamber 7; when the second valve 107, the third valve 108 and the fourth valve 109 are closed, the first valve 106 is opened, and the high-temperature saturated steam of the kiln head AQC boiler system 2 enters the autoclave 5, the material agitator and the curing chamber 7 through the gas distribution cylinder 9; when the first valve 106 and the fourth valve 109 are closed, the second valve 107 and the third valve 108 are opened, the high-temperature saturated steam of the kiln head AQC boiler system 2 can only enter the autoclave 5 and the slurry agitator 6.

[0079] The internal temperature of the autoclave 5 is 100°C ~ 220°C, and the internal pressure of the autoclave 5 is 0.8Mpa ~ 1.5Mpa; the internal temperature of the slurry agitator 6 is 50°C ~ 90°C, and the internal pressure of the slurry agitator 6 is 0.2Mpa ~ 0.8Mpa; the internal temperature of the curing chamber 7 is 20°C ~ 50°C, and the internal humidity of the curing chamber 7 is above 90%. The temperature and pressure range of the autoclave 5 can strengthen the structure of the components produced by aerated concrete and ensure the quality of the finished products; the temperature and pressure range of the slurry agitator 6 can fully stir the aerated concrete. By controlling the humidity and temperature inside the curing chamber 7, the components made of aerated concrete placed inside the curing chamber 7 can be effectively cured, which is conducive to the production of qualified components made of aerated concrete.

[0080] A first stop valve 110 is provided on one end of the first steam conduit 8 close to the kiln head AQC boiler system 2, and the first stop valve 110 is fixedly connected to the first steam conduit 8; an emergency vent pipe 111 is radially connected to one end of the first stop valve 110 close to the kiln head AQC boiler system 2, and a second stop valve 112 is provided on the emergency vent pipe 111. The first stop valve 110 can control the high-temperature saturated steam to enter the autoclave 5, the steam cylinder 9, the slurry agitator 6 and the curing chamber 7, so that the first stop valve 110 can control the flow direction of the high-temperature saturated steam. The second stop valve 112 is in a closed state under normal circumstances. In case of an emergency in production, the first stop valve 110 is quickly closed, and the second stop valve 112 on the emergency vent pipe 111 is opened to facilitate rapid pressure relief and ensure safe production.

[0081] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The kiln tail SP boiler system 3 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;

[0082] 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;

[0083] 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.

[0084] 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;

[0085] 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.

[0086] 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;

[0087] 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;

[0088] 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 3 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 In the SP boiler 24, superheated steam is generated by heat exchange with water. The superheated steam enters the kiln head AQC boiler system 2 through the superheated steam pipe 39, and then flows into the waste heat power generation aerated concrete production system 4 through the kiln head AQC boiler system 2. 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.

[0089] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 The kiln head AQC boiler system 2 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;

[0090] 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;

[0091] 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 ;

[0092] 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.

[0093] 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;

[0094] 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 first steam conduit 8, 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;

[0095] 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;

[0096] The bottom of the AQC boiler 53 is connected to the grate cooler 1. 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 1 provided at the lower part of the kiln head AQC boiler system 2 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 passes through the emergency air release valve 72 and the first electric valve 74 at the kiln head. The dynamic gate valve 73 and the second electric gate valve 74 at the kiln head discharge into the turbine room 75 or the first steam duct 8, thereby facilitating the discharge of high-temperature saturated steam into the aerated concrete production system 4 containing waste heat power generation, wherein the superheated steam from the SP boiler system 3 at the kiln tail enters the AQC boiler system 2 at the kiln head, and the low-temperature saturated steam mixed by the AQC boiler system 2 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 2 at the kiln head enters the steam distribution cylinder 9 through the first stop valve 110 and the first valve 106, and the high-temperature saturated steam is distributed to the autoclave 5, the slurry agitator 6 and the curing room 7 through the distribution cylinder 9, so as to facilitate the production of components made of aerated concrete.

[0097] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 A curing trolley is provided inside the autoclave 5, and the curing trolley can be slidably adapted to the interior of the autoclave 5. The curing trolley is convenient for delivering the aerated concrete components to be processed into the autoclave 5 for structural reinforcement, and the finished products are convenient for transportation and packaging.

[0098] One end of the autoclave 5 is provided with an end cover, which is hingedly connected to the one end of the autoclave 5 and is detachably sealed to the autoclave 5. The end cover achieves a sealing effect and can be opened or closed to facilitate the entry and exit of the steaming trolley.

[0099] See also Figure 1 , Figure 2 , Figure 3 and Figure 4In this embodiment, aerated concrete is a lightweight porous silicate product made of siliceous materials (sand, fly ash and silicon-containing tailings, etc.) and calcareous materials (lime, cement) as main raw materials, mixed with gas-generating agent (aluminum powder), and made through batching, mixing, pouring, pre-curing, cutting, autoclaving, curing and other process. Its production process requires steam and temperature for autoclave 5, slurry agitator 6, curing room 7, etc. The waste heat power generation system of cement plant generally has kiln tail SP boiler system 3 and kiln head AQC boiler system 2, kiln tail S The high-temperature exhaust gas at the outlet of the preheater 23 of the P boiler system 3 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.

[0100] 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, where it is heated to generate steam and then enters the SP boiler 24 for circulation. The superheated steam generated by the SP boiler 24 enters the superheated steam pipe 39 and enters the kiln head AQC boiler system 2 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.

[0101] 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 1 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.

[0102] 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 is divided into three routes: one route goes to the SP boiler 24; one route goes to the low-pressure drum 56; and one route 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 first steam conduit 8 in the waste heat power generation aerated concrete production system through the second electric gate valve 74 at the kiln head of the air guide pipe 71.

[0103] 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 110 to control the steam flow direction. Under normal circumstances, the second stop valve 112 on the emergency vent pipe 111 is closed, and the steam enters the aerated concrete production process through the first stop valve 110. In case of an emergency in production, the first stop valve 110 is quickly closed and the second stop valve 112 on the emergency vent pipe 111 is opened to ensure safe production.

[0104] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the unstable saturated steam is controlled by a temperature reducer and pressure reducer so that the steam stable temperature is between 100°C and 220°C and the pressure is between 0.8Mpa and 1.5Mpa. After the steam is stabilized, it enters the autoclave 5 to achieve stable production. In order to ensure that there is enough oxygen in the curing room 7 for people to breathe, a cold air valve 21 is set to perform secondary regulation of the oxygen intake and the temperature in the curing room 7. The first pressure relief valve 13 and the third pressure relief valve 20 are used to ensure manual safety pressure relief in an emergency.

[0105] Embodiment 2

[0106] 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 is provided with a steam generator 85, a high temperature boiler 86, and a fourth blowdown expansion tank 87;

[0107] 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 1 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 water entering the steam generator 85 from the high-temperature boiler 86 is water, and the saturated steam coming out of the steam generator 85 and returning 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 in the silicon calcium board production system containing waste heat power generation.

[0108] 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.

[0109] 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.

[0110] 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 1 to the steam generator 85 to prevent dusty flue gas with excessively high temperature from entering the steam generator 85 .

[0111] 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.

[0112] The beneficial effects of embodiment 1 and embodiment 2 in this technical solution are as follows:

[0113] 1. The cement plant has diversified economic benefits. The excess heat of the cement plant is used for power generation and aerated concrete production to improve economic benefits.

[0114] 2. Reduce production costs. The main raw materials in aerated concrete production are cement and lime, and the auxiliary materials are sand, fly ash and silicon-containing tailings. Using cement waste heat to generate steam can not only solve the temperature and steam problems required for equipment and maintenance in the production process of aerated concrete, but also some raw materials and cement of cement plants are also raw materials for aerated concrete, which can reduce the transportation cost of raw materials, the fuel cost of steam combustion, the cost of boiler construction and operation and maintenance costs.

[0115] 3. Industrial integration for energy conservation and environmental protection. Formulate integrated production plans for cement and aerated concrete products industries to promote industrial resource sharing and complementary capabilities, form positive feedback, achieve the goal of reducing overall 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 from the aerated concrete production process can share the waste gas treatment system of the cement production line.

[0116] 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.

[0117] 5. Multi-stage utilization of waste heat from cement kiln. The waste heat from cement kiln comes from the outlet of preheater 23C1 and grate cooler 1. The waste gas temperature of grate cooler 1 is between 0℃ and 1200℃, and the waste gas is sent to the kiln and decomposition furnace through 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, raw material drying system, and steam generator 85; the waste gas temperature is between 200℃ and 400℃, and can enter the steam generator 85 to produce aerated concrete; the waste gas temperature at the outlet of preheater 23C1 is between 260℃ and 350℃, and can enter the waste heat power generation system, steam generator 85, and aerated concrete curing room 7.

[0118] 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.

[0119] 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 aerated concrete using cement waste heat, characterized in that: It comprises a grate cooler (1); The grate cooler (1) is connected to a kiln head AQC boiler system (2), and the kiln head AQC boiler system (2) is respectively connected to a kiln tail SP boiler system (3) and a waste heat power generation aerated concrete production system (4); The superheated steam generated by the SP boiler system (3) at the kiln tail enters the AQC boiler system (2) at the kiln head, and the high-temperature flue gas at the tail of the grate cooler (1) enters the AQC boiler system (2) at the kiln head. The high-temperature saturated steam and the low-temperature saturated steam are mixed in the AQC boiler system (2) at the kiln head to form the high-temperature saturated steam. The high-temperature saturated steam is introduced into the aerated concrete production system (4) containing waste heat power generation, and the low-temperature saturated steam is introduced into the SP boiler system (3) at the kiln tail for repeated use. The waste heat power generation aerated concrete production system (4) comprises an autoclave (5), a slurry agitator (6) and a curing chamber (7), and the high-temperature saturated steam in the kiln head AQC boiler system (2) is respectively introduced into the autoclave (5), the slurry agitator (6) and the curing chamber (7).

2. The process method for producing aerated concrete using waste heat of cement according to claim 1, characterized in that: The autoclave (5), the slurry agitator (6) and the curing chamber (7) are provided with a first steam conduit (8) at one end close to the kiln head AQC boiler system (2), one end of the first steam conduit (8) is connected to the kiln head AQC boiler system (2), the other end of the first steam conduit (8) is provided with a steam sub-cylinder (9), an auxiliary steam conduit (10) is provided between the air inlet end of the steam sub-cylinder (9) and the first steam conduit (8), the air inlet end of the steam sub-cylinder (9) is connected to one end of the auxiliary steam conduit (10), the other end of the auxiliary steam conduit (10) is connected to the first steam conduit (8), and the autoclave (5), the slurry agitator (6) and the curing chamber (7) are all connected to the steam sub-cylinder (9).

3. The process method for producing aerated concrete using cement waste heat according to claim 2 is characterized in that: A second steam conduit (11) is connected between the autoclave (5) and the steam sub-cylinder (9), the second steam conduit (11) and the first steam conduit (8) are cross-connected with each other, a first temperature-reducing and pressure-reducing device (12) and a first pressure relief valve (13) are provided on the second steam conduit (11), the first temperature-reducing and pressure-reducing device (12) is close to the steam sub-cylinder (9), and the first pressure relief valve (13) is close to the autoclave (5); The outer wall of the autoclave (5) is provided with an autoclave inlet (14) and a sewage outlet (15); and one end of the second steam conduit (11) close to the autoclave (5) is connected to the autoclave inlet (14).

4. The process method for producing aerated concrete using cement waste heat according to claim 3 is characterized in that: A third steam conduit (16) is connected between the steam cylinder (9) and the slurry agitator (6); the third steam conduit (16) and the first steam conduit (8) are cross-connected with each other; a second temperature and pressure reducer (17) and a second pressure relief valve (18) are provided in sequence at one end of the third steam conduit (16) close to the slurry agitator (6); the second pressure relief valve (18) is close to the slurry agitator (6).

5. The process method for producing aerated concrete using cement waste heat according to claim 4 is characterized in that: A fourth steam conduit (19) is connected between the curing chamber (7) and the steam cylinder (9), the fourth steam conduit (19) being in communication with the other end of the first steam conduit (8), a third pressure relief valve (20) and a cold air valve (21) being provided in sequence at one end of the fourth steam conduit (19) close to the curing chamber (7), the cold air valve (21) being close to the curing chamber (7).

6. The process method for producing aerated concrete using cement waste heat according to claim 5, characterized in that: The first steam conduit (8) and the auxiliary steam conduit (10) are provided with a first valve (106), a second valve (107), a third valve (108) and a fourth valve (109); The first valve (106) is located on the secondary steam conduit (10), and the second valve (107) is located on the first steam conduit (8) between the secondary steam conduit (10) and the second steam conduit (11); The third valve (108) is located on the first steam conduit (8) between the second steam conduit (11) and the third steam conduit (16); The fourth valve (109) is located on the first steam conduit (8) between the third steam conduit (16) and the fourth steam conduit (19).

7. The process method for producing aerated concrete using cement waste heat according to claim 1 is characterized in that: The internal temperature of the autoclave (5) is 100°C to 220°C, and the internal pressure of the autoclave (5) is 0.8Mpa to 1.5Mpa; The internal temperature of the slurry agitator (6) is 50°C to 90°C, and the internal pressure of the slurry agitator (6) is 0.2Mpa to 0.8Mpa; The internal temperature of the curing room (7) is 20°C to 50°C, and the internal humidity of the curing room (7) is above 90%.

8. The process method for producing aerated concrete using cement waste heat according to claim 2 is characterized in that: A first stop valve (110) is provided on one end of the first steam conduit (8) close to the kiln head AQC boiler system (2), and the first stop valve (110) is fixedly connected to the first steam conduit (8); An end of the first stop valve (110) close to the kiln head AQC boiler system (2) is radially connected to an emergency vent pipe (111), and a second stop valve (112) is provided on the emergency vent pipe (111).

9. The process method for producing aerated concrete using cement waste heat according to claim 2, characterized in that: The kiln tail SP boiler system (3) 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 (51) 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 aerated concrete using cement waste heat according to claim 9, characterized in that: The kiln head AQC boiler system (2) 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 first steam conduit (8), 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 (1), 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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