Flash evaporation system capable of saving combustion furnace

Abstract

The utility model discloses a flash evaporation system capable of saving combustion furnaces. The flash evaporation system comprises a kiln, a heat exchanger, a flash evaporation assembly and two combustion furnaces, the heat exchanger is provided with a hot air flow channel and a fresh air flow channel. An air inlet of the hot air flow channel communicates with a tail gas discharge outlet of the kiln. The flash evaporation assembly comprises first flash evaporation equipment and second flash evaporation equipment, and the first flash evaporation equipment communicates with an air outlet of the fresh air flow channel; the two combustion furnaces are respectively communicated with the second flash evaporation equipment, and at least one combustion furnace is communicated with the first flash evaporation equipment. According to the scheme, waste heat of combustion tail gas of the kiln is utilized, the combustion furnace is saved, the equipment cost is reduced, meanwhile, standby application of the combustion furnace is achieved, and production continuity is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of flash evaporation equipment, in particular to a flash evaporation system of an economical combustion furnace. Background Art

[0002] With the large-scale popularization of electric vehicles and electrochemical energy storage, the market demand for lithium iron phosphate has increased dramatically. Iron phosphate is the precursor of lithium iron phosphate, and its demand has also increased. Iron phosphate is generally dried by flash evaporation. For example, patent CN102180453B discloses a flash drying method for preparing a lithium iron phosphate precursor, which directly feeds a slurry with a solid content of 60% (such as a uniform mixture of lithium carbonate, ferrous oxalate, diammonium phosphate and sucrose in deionized water) into a flash dryer, and the slurry entering the flash dryer is contacted and dried with hot air at a temperature of 360°C to obtain a dried lithium iron phosphate precursor.

[0003] However, as the capacity of ferrous phosphate flash drying increases, the consumption of fuels such as natural gas also increases. If the waste heat of the kiln's tail gas is directly used, there is a risk of foreign matter being introduced into the flash equipment; and if the kiln burns the tail gas indirectly, an additional heat exchanger is required. At the same time, considering the production maintenance issues, an additional flash combustion furnace must be configured to achieve the purpose of one equipment in use and one backup to ensure production continuity. But if this is the case, each set of equipment must add a heat exchanger and a combustion furnace, which greatly increases the production cost. Therefore, there is an urgent need for a flash system that can not only utilize the waste heat of the kiln's tail gas, but also save equipment investment and achieve one equipment in use and one backup. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned technical deficiencies, propose a flash evaporation system for saving combustion furnaces, and solve the technical problem in the prior art that a flash evaporation system is urgently needed that can utilize the waste heat of the tail gas of the kiln, save equipment investment and realize one-in-one equipment standby.

[0005] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a flash evaporation system for an economical combustion furnace, comprising:

[0007] Kiln;

[0008] The heat exchanger has a hot air flow channel and a fresh air flow channel, and the air inlet of the hot air flow channel is connected to the tail gas discharge port of the kiln;

[0009] A flash evaporation assembly, comprising a first flash evaporation device and a second flash evaporation device, wherein the first flash evaporation device is connected to an air outlet of the fresh air flow channel; and

[0010] The two combustion furnaces are respectively connected to the second flash evaporation equipment, and at least one of the combustion furnaces is connected to the first flash evaporation equipment.

[0011] In some embodiments, the flash evaporation assembly includes a first main pipe, a first branch pipe, a second branch pipe, a first shut-off valve and a second shut-off valve. One end of the first main pipe is connected to the first flash evaporation equipment, and the other end is respectively connected to the first branch pipe and the second branch pipe. The first branch pipe is connected to the air outlet of the fresh air flow channel, and the second branch pipe is connected to one of the two combustion furnaces. The first shut-off valve is arranged on the first main pipe, and the second shut-off valve is arranged on the second branch pipe.

[0012] In some embodiments, the flash evaporation system of the economizing combustion furnace further includes a second main pipe, two third branch pipes and two third shut-off valves, one end of the second main pipe is connected to the second flash evaporation equipment, and the other end is respectively connected to the two third branch pipes, the two third branch pipes are respectively connected to the two combustion furnaces, and the two third shut-off valves are respectively arranged on the two third branch pipes;

[0013] The first branch pipe is connected to one of the two third branch pipes, and the connection point between the first branch pipe and the third branch pipe is located between the corresponding combustion furnace and the third shut-off valve.

[0014] In some embodiments, the flash evaporation assembly further includes a first temperature sensor and a first air volume measuring instrument, and the first temperature sensor and the first air volume measuring instrument are disposed on the first branch pipe.

[0015] In some embodiments, the flash evaporation system of the economizing combustion furnace further includes two second temperature sensors and two second air volume measuring instruments, and the two second temperature sensors and the two second air volume measuring instruments are respectively disposed on the two third branch pipes.

[0016] In some embodiments, the first shut-off valve, the second shut-off valve, and the third shut-off valve are solenoid valves.

[0017] In some embodiments, the flash evaporation system of the economizing combustion furnace further comprises two combustion furnace blowers, and the two combustion furnace blowers are respectively connected to the two combustion furnaces.

[0018] In some embodiments, the flash evaporation system of the economizer combustion furnace further includes a heat exchanger blower, and the heat exchanger blower is connected to the air inlet of the fresh air flow channel.

[0019] In some embodiments, the flash evaporation system of the economical combustion furnace further includes a kiln hot air induced draft fan, and the kiln hot air induced draft fan is connected to the air outlet of the hot air flow channel.

[0020] In some embodiments, the kiln is provided with a plurality of kilns, and the tail gas exhaust ports of the plurality of kilns are respectively connected to the air inlet of the hot air flow channel.

[0021] Compared with the prior art, the flash evaporation system for saving combustion furnaces provided by the utility model transmits the combustion exhaust gas of the kiln to the hot air flow channel of the heat exchanger to exchange heat with the fresh air in the fresh air flow channel, so that the fresh air transmitted to the first flash evaporation device increases the required temperature, so as to provide a heat source for the first flash evaporation device and save the combustion furnace of a single device. The saved combustion furnace is used as a backup for the second flash evaporation device and is connected to the first flash evaporation device through a pipeline, even if there is a problem in the utilization of the waste heat of the kiln exhaust gas. The heat source provided by the combustion furnace can also be used for the first flash evaporation device for production without worrying about production problems. In this way, the waste heat of the combustion exhaust gas of the kiln is utilized, and the combustion furnace is saved and the equipment cost is reduced, while the backup of the combustion furnace is realized to ensure production continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a flash evaporation system of an economical combustion furnace provided in an embodiment of the utility model.

[0023] Description of reference numerals:

[0024] 1. Kiln; 2. Heat exchanger; 21. Air inlet of hot air flow channel; 22. Air outlet of hot air flow channel; 23. Air inlet of fresh air flow channel; 24. Air outlet of fresh air flow channel; 3. First flash evaporation equipment; 31. First main pipe; 32. First branch pipe; 33. Second branch pipe; 34. First shut-off valve; 35. Second shut-off valve; 36. First temperature sensor; 37. First air volume measuring instrument; 4. Second flash evaporation equipment; 41. Second main pipe; 42. Third branch pipe; 43. Third shut-off valve; 44. Second temperature sensor; 45. Second air volume measuring instrument; 5. Hot blast furnace; 6. Combustion furnace blower; 7. Heat exchanger blower; 8. Kiln hot air induced draft fan. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] In order to solve the technical problem that the prior art urgently needs a method that can utilize the waste heat of the kiln's exhaust gas, save equipment investment and realize one-in-one backup of equipment, the utility model provides a flash evaporation system for saving combustion furnaces, which not only utilizes the waste heat of the kiln's combustion exhaust gas, but also saves the combustion furnace, reduces equipment costs, realizes the backup of the combustion furnace, and ensures production continuity.

[0027] See also Figure 1 , Figure 1 It is a structural schematic diagram of the flash evaporation system of an economical combustion furnace in one embodiment of the utility model. The flash evaporation system of the economical combustion furnace includes a kiln 1, a heat exchanger 2, a flash evaporation component and two combustion furnaces 5; the heat exchanger 2 has a hot air flow channel and a fresh air flow channel, and the air inlet 21 of the hot air flow channel is connected to the exhaust gas discharge port of the kiln 1; the flash evaporation component includes a first flash evaporation device 3 and a second flash evaporation device 4, and the first flash evaporation device 3 is connected to the air outlet 24 of the fresh air flow channel; the two combustion furnaces 5 are respectively connected to the second flash evaporation device 4, and at least one combustion furnace 5 is connected to the first flash evaporation device 3.

[0028] The flash evaporation system for saving combustion furnaces provided by the utility model transmits the combustion tail gas of the kiln 1 to the hot air flow channel of the heat exchanger 2 to exchange heat with the fresh air in the fresh air flow channel, so that the fresh air transmitted to the first flash evaporation device 3 increases the required temperature, so as to provide a heat source for the first flash evaporation device 3 and save the combustion furnace 5 of a single set of devices. The saved combustion furnace 5 is used as a backup for the second flash evaporation device 4, and is connected to the first flash evaporation device 3 through a pipeline, even if there is a problem in the utilization of the waste heat of the tail gas of the kiln 1. The heat source provided by the combustion furnace 5 can also be used for production for the first flash evaporation device 3 without worrying about production problems. In this way, the waste heat of the combustion tail gas of the kiln 1 is utilized, and the combustion furnace 5 is saved and the equipment cost is reduced, while the backup of the combustion furnace 5 is realized to ensure production continuity.

[0029] In one embodiment, the flash assembly includes a first main pipe 31, a first branch pipe 32, a second branch pipe 33, a first shut-off valve 34 and a second shut-off valve 35. One end of the first main pipe 31 is connected to the first flash equipment 3, and the other end is respectively connected to the first branch pipe 32 and the second branch pipe 33. The first branch pipe 32 is connected to the air outlet 24 of the fresh air flow channel, and the second branch pipe 33 is connected to one of the two combustion furnaces 5. The first shut-off valve 34 is arranged on the first main pipe 31, and the second shut-off valve 35 is arranged on the second branch pipe 33.

[0030] In this embodiment, the first shut-off valve 34 is used to control the connection and disconnection between the first flash evaporation device 3 and the fresh air passage, and the second shut-off valve 35 is used to control the connection and disconnection between the fresh air flash evaporation device and the combustion furnace 5, so as to ensure that the heat source of the first flash evaporation device 3 is composed of the kiln 1 and the combustion furnace 5, one for use and one for backup. It should be noted that in this solution, the first shut-off valve 34 and the second shut-off valve 35 are high-temperature solenoid valves.

[0031] In one embodiment, the flash evaporation system of the economical combustion furnace also includes a second main pipe 41, two third branch pipes 42 and two third shut-off valves 43. One end of the second main pipe 41 is connected to the second flash evaporation equipment 4, and the other end is respectively connected to the two third branch pipes 42. The two third branch pipes 42 are respectively connected to the two combustion furnaces 5, and the two third shut-off valves 43 are respectively arranged on the two third branch pipes 42; the first branch pipe 32 is connected to one of the two third branch pipes 42, and the connecting point between the first branch pipe 32 and the third branch pipe 42 is located between the corresponding combustion furnace 5 and the third shut-off valve 43.

[0032] In this embodiment, two third shut-off valves 43 are used to control the connection and disconnection between the two combustion furnaces 5 and the second flash evaporation device 4, ensuring that the heat source of the second flash evaporation device 4 is composed of two combustion furnaces 5, one for use and one for backup, and cooperates with the kiln 1 to save the combustion furnaces 5 while ensuring production continuity. It should be noted that in this embodiment, the third shut-off valve 43 is a high temperature resistant solenoid valve.

[0033] It should be noted that, in one embodiment, a solenoid valve is provided on the first main pipe 31 , and the fresh air after heat exchange can also be transported to the second flash evaporation device 4 via the first branch pipe 32 , the second branch pipe 33 , the third branch pipe 42 and the second main pipe 41 .

[0034] In one embodiment, the flash evaporation assembly further includes a first temperature sensor 36 and a first air volume measuring instrument 37 , and the first temperature sensor 36 and the first air volume measuring instrument 37 are disposed on the first branch pipe 32 .

[0035] In this embodiment, the temperature and flow rate of the fresh air after heat exchange in the first branch pipe 32 are monitored by the first temperature sensor 36 and the first air volume measuring instrument 37 to ensure that the temperature and flow rate of the fresh air delivered to the first flash evaporation device 3 meet the requirements. It should be noted that the structure and principle of the temperature sensor and the air volume measuring instrument are prior art and will not be elaborated here.

[0036] In one embodiment, the flash evaporation system of the economizer further includes two second temperature sensors 44 and two second air volume measuring instruments 45 . The two second temperature sensors 44 and the two second air volume measuring instruments 45 are respectively disposed on the two third branch pipes 42 .

[0037] Correspondingly, in this embodiment, a second temperature sensor 44 and a second air volume measuring instrument 45 are respectively provided on the two third branch pipes 42 to monitor the temperature and flow rate of the hot air in the third branch pipe 42 in real time to ensure that the temperature and flow rate of the hot air outputted from the combustion furnace 5 to the second flash evaporation device 4 or the first flash evaporation device 3 meet the requirements.

[0038] In one embodiment, the flash evaporation system of the economical combustion furnace also includes a kiln hot air induced draft fan 8, a heat exchanger blower 7 and two combustion furnace blowers 6, the kiln hot air induced draft fan 8 is connected to the air outlet 22 of the hot air flow channel, the heat exchanger blower 7 is connected to the air inlet 23 of the fresh air flow channel, and the two combustion furnace blowers 6 are respectively connected to the two combustion furnaces 5.

[0039] In this embodiment, the hot air induced draft fan 8 of the kiln and the heat exchanger blower 7 are used to control the wind speed in the hot air flow channel and the fresh air flow channel of the heat exchanger 2, thereby controlling the temperature and flow rate of the fresh air delivered to the first heat exchange device, thereby improving practicality. Similarly, two combustion furnace blowers 6 are provided corresponding to the two combustion furnaces 5 to flexibly control the temperature and flow rate of the hot air delivered to the second flash evaporation device 4 or the first flash evaporation device 3.

[0040] In one embodiment, a plurality of kilns 1 are provided, and the tail gas discharge ports of the plurality of kilns 1 are respectively connected to the air inlet 21 of the hot air flow channel.

[0041] In this embodiment, the tail gas discharge ports of multiple kilns 1 in the factory are connected to the air inlet 21 of the hot air flow channel of the heat exchanger 2 to realize the recovery and utilization of the waste heat of the tail gas and improve the heat exchange rate of the fresh air.

[0042] In order to better understand the present invention, the following Figure 1 The technical solution of the utility model is described in detail:

[0043] During normal production, the second shut-off valve 35 is disconnected, one combustion furnace 5 is opened and the corresponding third shut-off valve 43 is turned on; at this time, the exhaust gas discharged by the kiln 1 exchanges heat with the fresh air passing through the heat exchanger 2, and the fresh air heated by the heat exchange is transported to the first flash evaporation device 3; at the same time, the hot air generated by the combustion furnace 5 is transported to the second flash evaporation device 4. When the kiln 1 stops operating abnormally, the first shut-off valve 34 is disconnected, and the second shut-off valve 35 is turned on, the hot air generated by the combustion furnace 5 can be transported to the second flash evaporation device 4 and the first flash evaporation device 3 at the same time, and the hot air volume is increased by the combustion furnace blower 6 to ensure the normal operation of the second flash evaporation device 4 and the first flash evaporation, thereby ensuring the continuity of production, meeting the one-in-one standby requirement of the combustion furnace 5, and saving equipment investment costs.

[0044] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A flash evaporation system for an economical combustion furnace, characterized in that: include: Kiln; The heat exchanger has a hot air flow channel and a fresh air flow channel, and the air inlet of the hot air flow channel is connected to the tail gas discharge port of the kiln; A flash evaporation assembly, comprising a first flash evaporation device and a second flash evaporation device, wherein the first flash evaporation device is connected to an air outlet of the fresh air flow channel; and The two combustion furnaces are respectively connected to the second flash evaporation equipment, and at least one of the combustion furnaces is connected to the first flash evaporation equipment.

2. The flash evaporation system of the economizer combustion furnace according to claim 1, characterized in that: The flash assembly includes a first main pipe, a first branch pipe, a second branch pipe, a first shut-off valve and a second shut-off valve. One end of the first main pipe is connected to the first flash equipment, and the other end is respectively connected to the first branch pipe and the second branch pipe. The first branch pipe is connected to the air outlet of the fresh air flow channel, and the second branch pipe is connected to one of the two combustion furnaces. The first shut-off valve is arranged on the first main pipe, and the second shut-off valve is arranged on the second branch pipe.

3. The flash evaporation system of the economizer combustion furnace according to claim 2, characterized in that: The flash evaporation system of the economizing combustion furnace further includes a second main pipe, two third branch pipes and two third shut-off valves, wherein one end of the second main pipe is connected to the second flash evaporation equipment, and the other end is respectively connected to the two third branch pipes, the two third branch pipes are respectively connected to the two combustion furnaces, and the two third shut-off valves are respectively arranged on the two third branch pipes; The first branch pipe is connected to one of the two third branch pipes, and the connection point between the first branch pipe and the third branch pipe is located between the corresponding combustion furnace and the third shut-off valve.

4. The flash steam system of the economizer combustion furnace according to claim 3, characterized in that: The flash evaporation assembly further includes a first temperature sensor and a first air volume measuring instrument, and the first temperature sensor and the first air volume measuring instrument are arranged on the first branch pipe.

5. The flash evaporation system of the economizer combustion furnace according to claim 3, characterized in that: The flash evaporation system of the economical combustion furnace further comprises two second temperature sensors and two second air volume measuring instruments, and the two second temperature sensors and the two second air volume measuring instruments are respectively arranged on the two third branch pipes.

6. The flash system of the economizer combustion furnace according to claim 3, characterized in that: The first shut-off valve, the second shut-off valve, and the third shut-off valve are solenoid valves.

7. The flash system of the economizer combustion furnace according to claim 1, characterized in that: The flash evaporation system of the economical combustion furnace also includes two combustion furnace blowers, and the two combustion furnace blowers are respectively connected to the two combustion furnaces.

8. The flash system of the economizer combustion furnace according to claim 1, characterized in that: The flash evaporation system of the economizing combustion furnace also includes a heat exchanger blower, and the heat exchanger blower is connected to the air inlet of the fresh air flow channel.

9. The flash steam system of the economizer combustion furnace according to claim 1, characterized in that: The flash evaporation system of the economical combustion furnace also includes a kiln hot air induced draft fan, and the kiln hot air induced draft fan is connected to the air outlet of the hot air flow channel.

10. The flash steam system of the economizer combustion furnace according to claim 1, characterized in that: The kilns are provided in plurality, and tail gas discharge ports of the plurality of kilns are respectively connected to the air inlets of the hot air flow channel.

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