CN115875994A - Calcium carbide granulation waste heat recovery system, process and total absorption heat collection calculation method - Google Patents
Calcium carbide granulation waste heat recovery system, process and total absorption heat collection calculation method Download PDFInfo
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- CN115875994A CN115875994A CN202211523557.4A CN202211523557A CN115875994A CN 115875994 A CN115875994 A CN 115875994A CN 202211523557 A CN202211523557 A CN 202211523557A CN 115875994 A CN115875994 A CN 115875994A
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Abstract
The invention belongs to the technical field of calcium carbide smelting, and particularly relates to a calcium carbide granulation waste heat recovery system, a calcium carbide granulation waste heat recovery process and a total heat absorption collection calculation method. The calcium carbide granulation waste heat recovery system comprises: at least one calcium carbide granulating device for receiving the high-temperature calcium carbide liquid and cooling and shaping the high-temperature calcium carbide liquid into calcium carbide particles; the crushing device is used for receiving calcium carbide particles and crushing and separating the calcium carbide particles which are adhered together; and the calcium carbide waste heat recovery device is used for releasing heat contained in calcium carbide particles into the molten salt and water. According to the invention, each calcium carbide granulation device receives high-temperature calcium carbide liquid output by a calcium carbide furnace, the high-temperature calcium carbide liquid is cooled and formed into calcium carbide particles in conveying, the calcium carbide particles which are adhered together are crushed and separated by a crushing device, the calcium carbide particles are treated by a calcium carbide waste heat recovery device, heat is released into molten salt and water, and high-temperature molten salt and hot water steam are generated. Meanwhile, the calcium carbide particles are cooled, and the high-temperature calcium carbide liquid is rapidly and continuously granulated.
Description
Technical Field
The invention belongs to the technical field of smelting calcium carbide, and particularly relates to a calcium carbide granulation waste heat recovery system, a calcium carbide granulation waste heat recovery process and a total heat absorption collection calculation method.
Background
The main component of the calcium carbide is CaC 2 It is an important basic material in organic synthesis industry and widely applied to various organic synthesis products.
At present, in the process of smelting calcium carbide in a calcium carbide furnace 1, high-temperature calcium carbide liquid with the temperature of 1700-2100 ℃ is generated in the furnace. The high-temperature calcium carbide liquid flows from the calcium carbide furnace 1 to the cast steel calcium carbide pot, the high-temperature calcium carbide liquid is conveyed to a cooling plant by a rail car at the moment, and the high-temperature calcium carbide liquid is naturally cooled to 500-600 ℃ by air to form calcium carbide ingots; then, hoisting out calcium carbide ingots with the weight of about 1 ton by using a large lifting hook, and continuously and naturally ventilating and cooling to below 100 ℃; and then the calcium carbide ingot is sent to a crushing workshop for coarse crushing and fine crushing to prepare calcium carbide particles according with the size for later use.
However, in the process of granulating the calcium carbide liquid, the cooling speed of the large calcium carbide ingots is low, the cooling time is long, a large area of field needs to be occupied, and the production efficiency is low. Meanwhile, a large amount of calcium carbide dust is generated in the crushing process, and the environment is polluted. And the calcium carbide dust is not recovered to cause waste, thereby causing economic loss. In addition, a large amount of sensible heat carried by the high-temperature calcium carbide liquid is directly wasted in the cooling process, and is not effectively utilized, so that energy loss is caused. Belongs to a typical three-high technology of high investment, high pollution and high energy consumption, and does not meet the requirements of energy conservation, emission reduction and sustainable development.
Disclosure of Invention
The invention aims to provide a calcium carbide granulation waste heat recovery system, a calcium carbide granulation waste heat recovery process and a total heat absorption collection calculation method, and aims to solve the technical problems that calcium carbide ingots are adopted in the existing calcium carbide liquid granulation process, the granulation cooling time is long, and waste heat cannot be recovered.
In order to solve the technical problem, the invention provides a calcium carbide granulation waste heat recovery system, which comprises: at least one calcium carbide granulating device, which is used for receiving the high-temperature calcium carbide liquid intermittently output by the corresponding calcium carbide furnace and cooling and shaping the high-temperature calcium carbide liquid into calcium carbide particles; the crushing device is used for receiving calcium carbide particles output by each calcium carbide granulating device and crushing and separating the calcium carbide particles adhered together; and the calcium carbide waste heat recovery device is used for cooling high-temperature gas released by calcium carbide particles output by the crushing device to low-temperature gas, blowing back, and performing circulating heat exchange to generate high-temperature molten salt and hot water steam.
Further, the carbide prilling granulator includes: the feed end of the conveyer belt is positioned below the discharge port of the calcium carbide furnace, and the discharge end of the conveyer belt is positioned above the crushing device; a plurality of granulating trolleys which are fixed on the conveying belt at intervals and receive the high-temperature calcium carbide liquid in respective independent subareas; wherein the prilling trolley comprises: the top of the vehicle body is provided with a plurality of fixed grooves for separately and independently storing high-temperature calcium carbide liquid; the mounting pieces are uniformly distributed at the bottom of the vehicle body so as to fix the vehicle body on the conveying belt; the conveyer belt is suitable for the granulation dolly of circulating transport to make the granulation dolly that is equipped with high temperature carbide liquid remove to breaker, the high temperature carbide liquid cooling of setting inslot is finalized the design and is emptyd to breaker in through the granulation dolly upset after the carbide granule.
Further, a radiation heat exchanger suitable for absorbing heat energy in high-temperature calcium carbide liquid on the granulation trolley is arranged above the conveying belt.
Furthermore, the section of the radiation heat exchanger is door-shaped and covers the granulating trolley.
Further, carbide waste heat recovery device includes: the heat storage and discharge tower is used for receiving, storing and discharging the calcium carbide particles output by the crushing device; the heat exchange mechanism is used for exchanging heat with high-temperature gas generated by the heat storage and release tower and reducing the temperature; the smoke inlet end of the smoke exhaust pipe is communicated with the heat storage and release tower, and the smoke outlet end of the smoke exhaust pipe is communicated with the inlet of the heat exchange mechanism; the smoke inlet end of the air return pipe is communicated with the outlet of the heat exchange mechanism, and the smoke outlet end of the air return pipe is communicated with the heat storage tower; the air blower is arranged on the air return pipe and used for sucking the high-temperature gas in the heat storage and release tower to the heat exchange mechanism and refluxing the low-temperature gas to the heat storage and release tower; the calcium carbide particles output by the crushing device are output by the translation lifting and conveying mechanism and lifted into the heat storage and discharge tower.
Further, the heat exchange mechanism includes: the primary heat exchanger is connected with the smoke exhaust pipe and is used for absorbing high-temperature gas and exchanging heat to medium-temperature gas for export; the secondary heat exchanger is connected with the gas return pipe and is used for absorbing the medium-temperature gas and exchanging heat to form low-temperature gas to be led out; wherein the first-stage heat exchanger is connected with the second-stage heat exchanger through a smoke guide pipe.
Further, the primary heat exchanger adopts a flue gas-molten salt heat exchanger; the secondary heat exchanger adopts a flue gas-water heat exchanger.
Further, the translating, elevating and conveying mechanism comprises: the translation conveying component is used for horizontally outputting the calcium carbide particles output by the crushing device; and the feeding end of the lifting conveying component is connected with the translation conveying part, and the discharging end of the lifting conveying component is obliquely upwards inserted into the corresponding heat storage and release tower.
In another aspect, the present invention further provides a calcium carbide granulation waste heat recovery process, including: step 1, intermittently flowing out high-temperature calcium carbide liquid from a calcium carbide furnace; step 2, each granulation trolley independently receives the high-temperature calcium carbide liquid in a partition mode; 3, circularly conveying each granulation trolley by a conveying belt, moving the granulation trolley filled with the high-temperature calcium carbide liquid to a crushing device, cooling and shaping the high-temperature calcium carbide liquid on the granulation trolley into calcium carbide particles, overturning the granulation trolley at the discharge end of the conveying belt, pouring the calcium carbide particles out, and then moving the granulation trolley to a calcium carbide furnace; step 4, the crushing device receives calcium carbide particles overturned and poured by the granulation trolley, and crushes and separates the calcium carbide particles adhered together; step 5, outputting and lifting the calcium carbide particles crushed and separated by the crushing device into a storage and discharge tower by the translation lifting and conveying mechanism; step 6, the heat storage and release tower receives the calcium carbide particles output by the translation lifting and conveying mechanism, and stores and discharges the calcium carbide particles; and 7, pumping out the high-temperature gas in the heat storage and release tower by the blower, leading out the high-temperature gas after heat exchange into medium-temperature gas by the primary heat exchanger, and leading the medium-temperature gas into low-temperature gas after heat exchange by the secondary heat exchanger to flow back into the heat storage and release tower.
In a third aspect, the invention also provides a method for calculating the total heat collection quantity absorbed by the calcium carbide granulation waste heat recovery system, which comprises the following steps of calculating the total heat collection quantity absorbed by the calcium carbide granulation waste heat recovery system according to the radiation heat exchange at the calcium carbide furnace mouth and the heat release of calcium carbide particles in heat storage and release equipment:
Q＝Q 1 +Q 2
Q 2 ＝cmΔt·t 2
t＝t 1 +t 2
wherein, Q: absorbing the total heat collection amount kj of the calcium carbide granulation waste heat recovery system;
Q 1 : the total heat kj collected in the calcium carbide furnace mouth radiation heat exchanger;
Q 2 : the total heat kj collected in the heat storage and release tower for calcium carbide granulation;
epsilon: emissivity is 0-1, and emissivity is 0.8 by integrating actual operation environment on site;
σ: staffin bohr's constant
T 1 : the surface (emission surface) temperature k of the calcium carbide;
T 2 : testing the surface (receiving surface) temperature k of the steel plate for calcium carbide radiation;
s: radiation heat exchange area m 2 Design value: 10;
c: 1.088308 kj/(kg. DEG C) of calcium carbide specific heat;
m: the heat exchange mass of the hourly calcium carbide is 6700kg/h;
delta t is the temperature difference in the heat release temperature zone of the calcium carbide particles, and is set to be 575 ℃ according to the actual test result;
t: collecting the total heat of the calcium carbide furnace mouth radiation heat exchange and the total heat collecting time of the calcium carbide granulation in the heat storage and release equipment, wherein the total heat collecting time is set to be 1h;
t 1 : collecting the total heat used by the radiation heat exchange of the calcium carbide furnace mouth for a long time h;
t 2 : and collecting the total heat of the calcium carbide granulation in the heat storage and release equipment for a long time h.
The calcium carbide granulation waste heat recovery system, the process and the total heat absorption quantity calculation method have the beneficial effects that each calcium carbide granulation device is used for receiving high-temperature calcium carbide liquid output by the calcium carbide furnace, the high-temperature calcium carbide liquid is cooled and shaped into calcium carbide particles in the conveying process, the crushing device is used for crushing and separating the calcium carbide particles which are adhered together, the calcium carbide particles are treated by the calcium carbide waste heat recovery device, and the high-temperature gas released by the calcium carbide particles is subjected to heat exchange and cooling. Through the operation, the high-temperature calcium carbide liquid can be rapidly and continuously granulated, partial latent heat and sensible heat of the calcium carbide in the production process can be fully recovered, energy loss and waste are avoided, and the requirements of energy conservation, emission reduction and sustainable development are met.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural block diagram of a calcium carbide granulation waste heat recovery system and a process thereof;
fig. 2 is a schematic structural diagram of the calcium carbide granulation waste heat recovery system and the process thereof;
fig. 3 is a schematic structural diagram of a preferred embodiment of the calcium carbide granulation waste heat recovery system and the process thereof;
fig. 4 is a structural block diagram of a preferred embodiment of the calcium carbide granulation waste heat recovery system and the process thereof;
figure 5 is a schematic structural view of a preferred embodiment of the prilling trolley according to the invention.
In the figure:
1, a calcium carbide furnace;
the calcium carbide granulation device 2, the conveyer belt 21, the granulation trolley 22, the trolley body 221, the shaping groove 222 and the mounting piece 223;
a crushing device 3 and calcium carbide particles 4;
the calcium carbide waste heat recovery device 5, the heat storage and release tower 51, the heat exchange mechanism 52, the primary heat exchanger 521, the secondary heat exchanger 522, the smoke guide pipe 523, the smoke exhaust pipe 53, the air return pipe 54 and the blower 55;
a radiation heat exchanger 6;
a translation lifting conveying mechanism 7, a translation conveying component 71 and a lifting conveying component 72.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1 and 2, the calcium carbide granulation waste heat recovery system of the present embodiment includes: at least one set of calcium carbide granulating device 2, a crushing device 3 and at least one set of calcium carbide waste heat recovery device 5; the calcium carbide granulating device 2 is used for receiving high-temperature calcium carbide liquid intermittently output by the corresponding calcium carbide furnace 1, cooling the high-temperature calcium carbide liquid into calcium carbide particles 4, and at the moment, part of each calcium carbide particle 4 in the granulating device 2 is adhered together; the crushing device 3 is used for receiving the calcium carbide particles 4 output by each calcium carbide granulating device 2 and crushing and separating the calcium carbide particles adhered together; carbide waste heat recovery device 5 is used for cooling to low temperature gas with the high-temperature gas of 4 releases of carbide granules of breaker 3 output to blow back in carbide waste heat recovery device 5, the circulation heat transfer produces high temperature fused salt and hot water steam, is used for retrieving and recycles. In order to meet the production requirements, in the embodiment, three calcium carbide granulating devices 2 are adopted, and the three devices are radially arranged outside the crushing device 3 at intervals by taking the crushing device 3 as a center; the calcium carbide waste heat recovery devices 5 adopt two sets and shunt the calcium carbide particles 4 output by the crushing device 3, so that the calcium carbide particles 4 can release latent heat and sensible heat for a long enough time, and waste heat recovery is facilitated. Receive the high temperature carbide liquid of 1 output of carbide stove through each carbide prilling granulator 2 to cooling the high temperature carbide liquid and stereotype for carbide granule 4 in transportation process, breaker 3 will adhere together the broken separation of carbide granule 4, and carbide granule 4 is handled through carbide waste heat recovery device 5 again, and the high temperature gas heat transfer cooling of carbide granule 4 release. Discharging after the high-temperature calcium carbide and gas exchange heat and cooling, heating the gas into high-temperature gas, then exchanging heat with molten salt/water to generate high-temperature molten salt and steam, and circulating the gas after cooling to exchange heat with the high-temperature calcium carbide. Through the operation, the high-temperature calcium carbide liquid can be rapidly and continuously granulated, partial latent heat and sensible heat of the calcium carbide in the production process can be fully recovered, energy loss and waste are avoided, and the requirements of energy conservation, emission reduction and sustainable development are met.
As shown in fig. 3 and 4, in the present embodiment, specifically, the calcium carbide granulation device 2 includes: a conveyor belt 21, a plurality of granulation trolleys 22; wherein, the feed end of the conveyer belt 21 is positioned below the discharge port of the calcium carbide furnace 1, and the discharge end is positioned above the crushing device 3; the granulating trolleys 22 are fixed on the conveyer belt 21 at intervals so as to receive the high-temperature calcium carbide liquid in respective independent areas; in detail, the granulation trolley 22 comprises: a vehicle body 221, and a plurality of mounts 223; the top of the car body 221 is provided with a plurality of mutually independent shaping grooves 222 for separately and independently storing high-temperature calcium carbide liquid so as to facilitate subsequent cooling and shaping; the high-temperature calcium carbide liquid is solidified and formed into calcium carbide particles 4 in the shaping groove 222, and at the moment, the calcium carbide particles 4 are extremely high in temperature, and can release latent heat and sensible heat through heat radiation and heat convection (as shown in the schematic heat dissipation of the calcium carbide particles 4 in the triangular shape at the top of the granulation trolley 22 in fig. 5); each mounting member 223 is uniformly distributed at the bottom of the vehicle body 221 to fix the vehicle body 221 on the outer surface of the conveyor belt 21; the conveyer belt 21 is suitable for circularly conveying the granulation trolley 22 so that the granulation trolley 22 filled with the high-temperature calcium carbide liquid moves towards the crushing device 3, and the high-temperature calcium carbide liquid in each shaping groove 222 is cooled into calcium carbide particles 4 and then overturned by the granulation trolley 22 to be poured into the crushing device 3. The granulation dolly 22 sets up on conveyer belt 21 at intervals, so control the output of carbide stove 1 to make carbide stove 1 output high temperature carbide liquid intermittently, avoid high temperature carbide liquid to fall and cause the waste of material and the damage of part on conveyer belt 21. The high-temperature calcium carbide liquid flowing into the granulating trolley 22 is divided into a plurality of mutually independent parts through the shaping grooves 222, and is cooled and shaped into calcium carbide particles 4 in the subsequent conveying process; when the granulating trolley 22 moves to the discharge end of the conveyor belt 21, the granulating trolley 22 reversely rotates along with the belt of the conveyor belt 21, the granulating trolley 22 is turned and inclined, the calcium carbide particles 4 which are stuck together and come out from the sizing groove 222 are poured into the crushing device 3, and the calcium carbide particles 4 which are stuck together are crushed and separated. For carbide spindle granulation cooling, the granule diminishes, and heat radiating area increases, and cooling time shortens greatly, effectively improves production efficiency, and need not to occupy the place of large tracts of land, and the practicality is stronger.
As shown in fig. 3 and 4, in the present embodiment, a radiation heat exchanger 6 is preferably disposed above the conveyer belt 21, and is adapted to absorb heat energy in the high-temperature calcium carbide liquid on the granulation trolley 22. The heat released by partial heat radiation and heat convection of the high-temperature calcium carbide liquid can be absorbed by the radiation heat exchanger 6, and the energy utilization rate is improved.
As shown in fig. 5, in the present embodiment, the radiant heat exchanger 6 is preferably door-shaped in cross-section to cover the prilling trolley 22. The radiation heat exchanger 6 is similar to a tunnel kiln heat exchange device, covers the upper part of the granulation trolley 22, so that the granulation trolley 22 passes through the inside of the granulation trolley, and heat released by heat radiation and heat convection of the high-temperature calcium carbide liquid can be fully absorbed.
As shown in fig. 3 and 4, in this embodiment, specifically, the calcium carbide waste heat recovery device 5 includes: a heat storage tower 51, a heat exchange mechanism 52, a smoke exhaust pipe 53, an air return pipe 54 and a blower 55; the heat storage and discharge tower 51 is used for receiving, storing and discharging the calcium carbide particles 4 output by the crushing device 3; the heat exchange mechanism 52 is used for exchanging heat and reducing temperature of the high-temperature gas generated by the heat storage and release tower 51; the smoke inlet end of the smoke exhaust pipe 53 is communicated with the heat storage and release tower 51, and the smoke outlet end of the smoke exhaust pipe 53 is communicated with the inlet of the heat exchange mechanism 52; the smoke inlet end of the air return pipe 54 is communicated with the outlet of the heat exchange mechanism 52, and the smoke outlet end of the air return pipe 54 is communicated with the heat storage tower 51; the blower 55 is arranged on the air return pipe 54 and is used for pumping the high-temperature gas in the heat storage and release tower 51 to the heat exchange mechanism 52 and pumping the low-temperature gas back to the heat storage and release tower 51 so as to realize forced circulation of the gas in the calcium carbide waste heat recovery device 5; the calcium carbide particles 4 output by the crushing device 3 are output by the translation lifting conveying mechanism 7 and lifted into the heat storage and release tower 51. The heat storage and release tower 51 is provided with a plurality of inclined material guide baffles or spiral material guide baffles, so that the calcium carbide particles 4 can have more circulation time in the heat storage and release tower 51, and the calcium carbide particles 4 can release latent heat and sensible heat conveniently. When the calcium carbide particles 4 slowly pass through the heat storage and release tower 51, latent heat and sensible heat are released to form high-temperature gas, the high-temperature gas is extracted from the heat storage and release tower 51 by the blower 55, the high-temperature gas enters the heat exchange mechanism 52 through the smoke exhaust pipe 53 to be exchanged into low-temperature gas, and the low-temperature gas is sucked through the air return pipe 54 and flows back into the heat storage and release tower 51 to blow back the calcium carbide particles 4, so that the calcium carbide particles enter the next cycle. Through the heat exchange cooling and pipeline backflow blowback effects of the heat exchange mechanism 52, the efficiency of latent heat and sensible heat release of the calcium carbide particles 4 is effectively improved, meanwhile, the calcium carbide particles 4 are accelerated to be cooled, and the production efficiency is improved; the heat energy exchanged by the heat exchange mechanism 52 is reused, and the economic benefit is improved.
As shown in fig. 3 and 4, in the present embodiment, preferably, the heat exchanging mechanism 52 includes: primary 521 and secondary 522 heat exchangers; the primary heat exchanger 521 is connected with the smoke exhaust pipe 53 and is used for absorbing high-temperature gas and exchanging heat to medium-temperature gas for export; the secondary heat exchanger 522 is connected with the air return pipe 54 and is used for absorbing medium-temperature gas and exchanging heat to low-temperature gas for export; the first-stage heat exchanger 521 and the second-stage heat exchanger 522 are sequentially communicated from the smoke outlet end of the smoke exhaust pipe 53 to the smoke inlet end of the air return pipe 54, and the first-stage heat exchanger 521 and the second-stage heat exchanger 522 are communicated through a smoke guide pipe 523. Through the two-stage heat exchange of the first-stage heat exchanger 521 and the second-stage heat exchanger 522, the high-temperature gas is subjected to heat exchange to form intermediate-temperature gas, the intermediate-temperature gas is subjected to heat exchange to low-temperature gas, the temperature is reduced layer by layer, stepped heat exchange is performed, the latent heat and the sensible heat released by the calcium carbide particles 4 are absorbed, the calcium carbide particles 4 are cooled rapidly, the waste heat is recycled fully and reasonably, and the economic benefit is improved.
As shown in fig. 4, in the present embodiment, preferably, the primary heat exchanger 521 is a flue gas-molten salt heat exchanger; the secondary heat exchanger 522 employs a flue gas-water heat exchanger. The low-temperature molten salt enters the flue gas-molten salt heat exchanger to exchange heat with the high-temperature gas, the high-temperature gas is discharged after being changed into the medium-temperature gas, and the low-temperature molten salt is discharged after being changed into the high-temperature molten salt to utilize waste heat; the deoxidized water enters the flue gas-water heat exchanger to exchange heat with the medium-temperature gas, the medium-temperature gas is discharged after being changed into the low-temperature gas, and is blown into the tower from the bottom of the heat storage tower 51 to enter the next circulation, and the deoxidized water is changed into hot water steam to be discharged so as to realize the high-efficiency waste heat utilization. The high-temperature gas sequentially enters the flue gas-molten salt heat exchanger and the flue gas-water heat exchanger, heat energy of the high-temperature gas is transferred to the molten salt and water for waste heat utilization, and meanwhile, the high-temperature molten salt and the high-temperature steam are generated, so that efficient utilization of heat is realized.
As shown in fig. 3 and 4, in the present embodiment, specifically, the translation lift conveying mechanism 7 includes: a translation conveying member 71, at least one lifting conveying member 72; the translation conveying component 71 is used for horizontally outputting the calcium carbide particles 4 output by the crushing device 3; the feed end of each lifting and conveying member 72 is connected to the translation and conveying member 71, and the discharge end of each lifting and conveying member 72 is inserted obliquely upward into the corresponding heat storage tower 51. Through the horizontal output of 4 with the discharge carbide granules of breaker 3 of translation conveying component 71, the rethread promotes conveying component 72 and carries carbide granule 4 the ascending to one side to the corresponding hot tower 51 that stores in, realizes shunting and carries, and the follow-up heat exchange of the carbide granule 4 of being convenient for is cooled down, effectively improves production efficiency.
Example 2
As shown in fig. 1 to 5, on the basis of embodiment 1, embodiment 2 provides a calcium carbide granulation waste heat recovery process, which is implemented by using the calcium carbide granulation waste heat recovery system described in embodiment 1.
The calcium carbide granulation waste heat recovery process comprises the following steps: step 1, intermittently discharging high-temperature calcium carbide liquid from a calcium carbide furnace 1; step 2, enabling all the granulation trolleys 22 to sequentially pass through a liquid outlet of the calcium carbide furnace 1, and enabling each granulation trolley 22 to independently receive the high-temperature calcium carbide liquid in a partition mode; step 3, circularly conveying each granulating trolley 22 by a conveying belt 21, moving the granulating trolley 22 filled with the high-temperature calcium carbide liquid to a crushing device 3, cooling and shaping the high-temperature calcium carbide liquid on the granulating trolley 22 into calcium carbide particles 4, overturning the granulating trolley 22 at the discharge end of the conveying belt 21, pouring the calcium carbide particles 4, and moving the calcium carbide particles to a calcium carbide furnace 1; step 4, the crushing device 3 receives the calcium carbide particles 4 overturned and dumped by the granulating trolley 22, and crushes and separates the calcium carbide particles 4 which are adhered together; step 5, outputting and lifting the calcium carbide particles 4 crushed and separated by the crushing device 3 into a heat storage and release tower 51 by the translation lifting and conveying mechanism 7; step 6, the heat storage tower 51 receives the calcium carbide particles 7 output by the translation lifting conveying mechanism 7, and stores and discharges the calcium carbide particles 7; and 7, pumping the high-temperature gas in the heat storage and release tower 51 by the blower 55, exchanging heat of the high-temperature gas into medium-temperature gas by the primary heat exchanger 521, and discharging the medium-temperature gas out, and exchanging heat of the medium-temperature gas into low-temperature gas by the secondary heat exchanger 522 and refluxing the low-temperature gas into the heat storage and release tower 51.
Example 3
As shown in fig. 1 to 5, on the basis of embodiments 1 and 2, embodiment 3 provides a method for calculating the total heat collection absorbed by a calcium carbide granulation waste heat recovery system, and is implemented by using the calcium carbide granulation waste heat recovery system described in embodiment 1.
In the process flow of this embodiment 2, after the calcium carbide is discharged, heat is continuously dissipated in the air, and the heat is composed of two parts: the calcium carbide furnace mouth radiation heat exchange and the calcium carbide particles release heat in the heat storage and discharge equipment, so that the heat is rapidly recovered through two systems within a certain time. The total time t of the heat dissipation in the air after the calcium carbide is discharged is certain, and the total heat Q collected by the calcium carbide furnace mouth radiation heat exchanger 6 1 The total heat Q collected in the heat storage and release tower 51 together with the calcium carbide granulation 2 Contrary in time, i.e. t 1 When increasing, t 2 Then decrease, otherwise t 1 When decrease, t 2 Then increase is made; therefore, the radiant heat collection and the calcium carbide particle heat collection are combined when the total heat collection quantity absorbed by the calcium carbide granulation waste heat recovery system is calculatedAnd calculating, establishing a function of heat collection and time, taking an optimal solution (within a heat collection time interval t), and performing optimal control by combining the linked operation of the calcium carbide after the calcium carbide is discharged out of the furnace to obtain the maximum heat collection amount.
The method for calculating the total heat collection quantity of the calcium carbide granulation waste heat recovery system according to the radiation heat exchange of the calcium carbide furnace mouth and the heat release of calcium carbide particles in the heat storage and release equipment comprises the following steps:
Q＝Q1+Q2
Q2＝cmΔt·t2
t＝t1+t2
wherein, Q: absorbing the total heat collection amount kj of the calcium carbide granulation waste heat recovery system;
q1: the total heat kj collected in the calcium carbide furnace mouth radiation heat exchanger 6;
q2: the total heat kj collected in the heat storage and release tower 51 for calcium carbide granulation;
epsilon: emissivity is 0-1, and the emissivity is 0.8 by integrating the actual operation environment on site;
σ: staffin bohr's constant
T 1 : the surface (emission surface) temperature k of the calcium carbide;
T 2 : testing the surface (receiving surface) temperature k of the steel plate for calcium carbide radiation;
s: radiant heat exchange area m 2 Design value: 10;
c: 1.088308 kj/(kg. DEG C) of calcium carbide specific heat;
m: the heat exchange mass of the hourly calcium carbide is 6700kg/h;
delta t is the temperature difference in the calcium carbide particle heat release temperature zone, which is set to be 575 ℃ according to the actual test result;
t: collecting the total heat of the calcium carbide furnace mouth radiation heat exchange and the total heat collecting time of the calcium carbide granulation in the heat storage and release equipment, wherein the total heat collecting time is set to be 1h;
t 1 : collecting the total heat used by the radiation heat exchange of the calcium carbide furnace mouth for a long time h;
t 2 : and (3) collecting the total heat of the calcium carbide granulation in the heat storage and release equipment for a long time h.
In the formula, the operation steps are as follows, wherein the operation steps are obtained through radiation heat exchange practical tests:
1. place equipment test fixture at the top of the carbide pot of just coming out of the stove, select for use a rectangle steel sheet (0.5m 1.5m, thickness 6 mm) promptly to lay the rock wool at the upper surface of this steel sheet and be used for keeping warm, fix a position 3 test points at the lower surface of steel sheet (receiving face), corresponding test temperature is: t is t 11 、t 12 、t 13 (ii) a The carbide surface (transmitting surface) in the carbide pot sets up 2 test points, and the test temperature that corresponds is: t is t 21 、t 22 (ii) a Every 2 minutes a set of tests gave 5 data of the above test temperature, total test time: 1h, find t 21 、t 22 Average value of (A) T 2 Calculating t 11 、t 12 、t 13 Average value of (A) T 1 Calculate out
Evaluation of ^ by means of a fitting tool>
And a test time t 1 Is based on a first order functional relationship->
2. Will be a linear function
Substituting formula>
A one-dimensional quadratic equation Q =3.6 × epsilon σ (3 × 10) of Q with respect to time t1 is derived 9 t 1 -2×10 11 )S·t 1 +cmΔt·(t-t 1 ) Using mathematical calculation to obtain the maximum value of Q and corresponding t 1 (in the heat collection time: 0. Ltoreq. T1. Ltoreq.1), followed by mixing t with 1 Substituting into the formula t = t 1 +t 2 To obtain t 2 ，t 1 、t 2 Respectively corresponding to the heat exchange time of the calcium carbide in the radiation heat exchanger 6 and the heat storage and release tower 51.
3. The method has the advantages that the calcium carbide is combined to run in a linkage mode after being discharged, running control is optimized, the maximum heat collection amount is obtained, the maximization of heat collection recovery is achieved, and greater economic benefits are generated.
In summary, according to the calcium carbide granulation waste heat recovery system, the process and the total heat absorption quantity calculation method provided by the invention, each calcium carbide granulation device receives high-temperature calcium carbide liquid output by a calcium carbide furnace, the high-temperature calcium carbide liquid is cooled and shaped into calcium carbide particles in the conveying process, the crushing device crushes and separates the calcium carbide particles which are adhered together, the calcium carbide particles are treated by the calcium carbide waste heat recovery device, and high-temperature gas released by the calcium carbide particles is subjected to heat exchange and cooling. Through the operation, the high-temperature calcium carbide liquid can be rapidly and continuously granulated, partial latent heat and sensible heat of the calcium carbide in the production process can be fully recovered, energy loss and waste are avoided, and the requirements of energy conservation, emission reduction and sustainable development are met. The high-temperature calcium carbide liquid flowing into the granulation trolley is divided into a plurality of mutually independent parts through each shaping groove, and is cooled and shaped into calcium carbide particles in the subsequent conveying process; when the granulation dolly moves to the discharge end department of conveyer belt, the granulation dolly along with the belt of conveyer belt reverse gyration, the granulation dolly upset slope, come out in the setting groove and glue the carbide granule together and pour into breaker in, the carbide granule that the adhesion is in the same place is broken the separation. For carbide ingot granulation cooling, become the graininess by the cubic, whole heat radiating area increases, and cooling time shortens greatly, effectively improves production efficiency, and need not to occupy the place of large tracts of land, and the practicality is stronger. The calcium carbide particles release latent heat and sensible heat to form high-temperature gas when slowly passing through the heat storage tower, the high-temperature gas is pumped out of the heat storage tower by the air blower, the high-temperature gas enters the heat exchange mechanism through the smoke exhaust pipe to be exchanged into low-temperature gas, and the low-temperature gas is pumped back to the heat storage tower through the air return pipe to be subjected to back flushing to form calcium carbide particles and enters the next circulation. Through the heat exchange cooling of the heat exchange mechanism and the back flushing effect of the pipeline, the efficiency of releasing latent heat and sensible heat of calcium carbide particles is effectively improved, the cooling of the calcium carbide particles is accelerated, and the production efficiency is improved; the heat energy from the heat exchange mechanism can be recycled, and the economic benefit is improved. The method has the advantages that chain operation after the calcium carbide is discharged is combined, operation control is optimized, the total heat collection quantity of the calcium carbide granulation waste heat recovery system is calculated and absorbed according to the radiation heat exchange of the calcium carbide furnace mouth and the heat release of calcium carbide particles in the heat storage and release equipment, the heat collection maximization is achieved, and greater economic benefits are generated.
The components selected for use in the present application (components not illustrated for specific structures) are all common standard components or components known to those skilled in the art, and the structure and principle thereof can be known to those skilled in the art through technical manuals or through routine experimentation.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A calcium carbide granulation waste heat recovery system is characterized by comprising:
at least one calcium carbide granulating device (2) for receiving the high-temperature calcium carbide liquid intermittently output by the corresponding calcium carbide furnace (1) and cooling and shaping the high-temperature calcium carbide liquid into calcium carbide particles (4);
the crushing device (3) is used for receiving the calcium carbide particles (4) output by each calcium carbide granulating device (2) and crushing and separating the calcium carbide particles (4) which are adhered together;
and the calcium carbide waste heat recovery device (5) is used for cooling high-temperature gas released by the calcium carbide particles (4) output by the crushing device (3) to low-temperature gas and blowing back, and performing heat exchange in a circulating manner to generate high-temperature molten salt and hot water steam.
2. The calcium carbide granulation waste heat recovery system as set forth in claim 1,
the calcium carbide granulating device (2) comprises:
the feeding end of the conveying belt (21) is positioned below the discharge hole of the calcium carbide furnace (1), and the discharge end of the conveying belt is positioned above the crushing device (3);
a plurality of granulating trolleys (22) which are fixed on the conveyer belt (21) at intervals and receive the high-temperature calcium carbide liquid in respective independent subareas; wherein
The prilling trolley (22) comprising:
the top of the car body (221) is provided with a plurality of shaping grooves (222) for independently storing high-temperature calcium carbide liquid in a partition manner;
a plurality of mounting pieces (223) which are uniformly distributed at the bottom of the vehicle body (221) so as to fix the vehicle body (221) on the conveying belt (21);
conveyer belt (21) are suitable for cyclic conveying granulation dolly (22) to make granulation dolly (22) that are equipped with high temperature carbide liquid remove to breaker (3), and the high temperature carbide liquid cooling in design groove (222) is stereotyped and is emptyd to breaker (3) in through granulation dolly (22) upset after carbide granule (4).
3. The calcium carbide granulation waste heat recovery system as set forth in claim 2,
and a radiation heat exchanger (6) suitable for absorbing heat energy in the high-temperature carbide liquid on the granulation trolley (22) is arranged above the conveying belt (21).
4. The calcium carbide granulation waste heat recovery system as set forth in claim 3,
the section of the radiation heat exchanger (6) is door-shaped and covers the granulating trolley (22).
5. The calcium carbide granulation waste heat recovery system as set forth in claim 1,
the calcium carbide waste heat recovery device (5) comprises:
the heat storage and discharge tower (51) is used for receiving, storing and discharging the calcium carbide particles (4) output by the crushing device (3);
the heat exchange mechanism (52) is used for exchanging heat with high-temperature gas generated by the heat storage and release tower (51) and reducing the temperature;
a smoke inlet end of the smoke exhaust pipe (53) is communicated with the heat storage and release tower (51), and a smoke outlet end of the smoke exhaust pipe is communicated with an inlet of the heat exchange mechanism (52);
a smoke inlet end of the air return pipe (54) is communicated with an outlet of the heat exchange mechanism (52), and a smoke outlet end of the air return pipe is communicated with the heat storage tower (51);
a blower (55) arranged on the air return pipe (54) and used for pumping the high-temperature gas in the heat storage and release tower (51) to the heat exchange mechanism (52) and pumping the low-temperature gas back to the heat storage and release tower (51); wherein
The calcium carbide particles (4) output by the crushing device (3) are output by the translation lifting conveying mechanism (7) and lifted into the heat storage and release tower (51).
6. The calcium carbide granulation waste heat recovery system as set forth in claim 5,
the heat exchange mechanism (52) includes:
the primary heat exchanger (521) is connected with the smoke exhaust pipe (53) and is used for absorbing high-temperature gas and exchanging heat into medium-temperature gas to be discharged;
the secondary heat exchanger (522) is connected with the air return pipe (54) and is used for absorbing medium-temperature gas and exchanging heat into low-temperature gas to be led out; wherein
The primary heat exchanger (521) is connected with the secondary heat exchanger (522) through a smoke guide pipe (523).
7. The calcium carbide granulation waste heat recovery system of claim 6, wherein,
the primary heat exchanger (521) adopts a flue gas-molten salt heat exchanger;
the secondary heat exchanger (522) adopts a flue gas-water heat exchanger.
8. The calcium carbide granulation waste heat recovery system as set forth in claim 5,
the translating, lifting and conveying mechanism (7) comprises:
the translation conveying component (71) is used for horizontally outputting the calcium carbide particles (4) output by the crushing device (3);
at least one lifting conveying component (72), the feeding end of which is connected with the translation conveying component (71), and the discharging end of which is inserted into the corresponding heat storage tower (51) in an inclined upward manner.
9. A calcium carbide granulation waste heat recovery process is characterized by comprising the following steps:
step 1, intermittently discharging high-temperature calcium carbide liquid from a calcium carbide furnace (1);
step 2, each granulating trolley (22) receives the high-temperature calcium carbide liquid in a partition mode independently;
3, circularly conveying each granulating trolley (22) by a conveying belt (21), moving the granulating trolley (22) filled with high-temperature calcium carbide liquid to a crushing device (3), cooling and shaping the high-temperature calcium carbide liquid on the granulating trolley (22) into calcium carbide particles (4), overturning the granulating trolley (22) at the discharge end of the conveying belt (21) to pour the calcium carbide particles (4) and then moving the granulating trolley (22) to the calcium carbide furnace (1);
step 4, the crushing device (3) receives the calcium carbide particles (4) overturned and poured by the granulating trolley (22), and crushes and separates the calcium carbide particles (4) which are adhered together;
step 5, outputting and lifting the calcium carbide particles (4) which are crushed and separated by the crushing device (3) into a heat storage and release tower (51) by the translation lifting and conveying mechanism (7);
step 6, the heat storage and release tower (51) receives the calcium carbide particles (7) output by the translation lifting and conveying mechanism (7), and stores and discharges the calcium carbide particles (7);
and 7, pumping high-temperature gas in the heat storage and release tower (51) by the blower (55), exchanging heat of the high-temperature gas into medium-temperature gas by the primary heat exchanger (521) and leading out the medium-temperature gas, and exchanging heat of the medium-temperature gas into low-temperature gas by the secondary heat exchanger (522) and refluxing the low-temperature gas into the heat storage and release tower (51).
10. A method for calculating the heat of total absorption set of a calcium carbide granulation waste heat recovery system is characterized in that,
the method for calculating the total heat collection quantity of the calcium carbide granulation waste heat recovery system according to the radiation heat exchange of the calcium carbide furnace mouth and the heat release of calcium carbide particles in the heat storage and release equipment comprises the following steps:
Q＝Q 1 +Q 2
Q 2 ＝cmΔt·t 2
t＝t 1 +t 2
Q＝3.6×εσ(3×10 9 t 1 -2×10 11 )S·t 1 +cmΔt·(t-t 1 )
wherein, Q: absorbing the total heat collection amount kj of the calcium carbide granulation waste heat recovery system;
Q 1 : the total heat kj collected in the calcium carbide furnace mouth radiation heat exchanger (6);
Q 2 : the total heat kj collected in the heat storage and release tower (51) during calcium carbide granulation;
epsilon: emissivity is 0-1, and emissivity is 0.8 by integrating actual operation environment on site;
σ: staffin Borz constant [ 5.67X 10% -8 ]w/(m 2 ·k 4 )；
T 1 : the surface (emission surface) temperature k of the calcium carbide;
T 2 : testing the surface (receiving surface) temperature k of the steel plate for calcium carbide radiation;
s: radiation heat exchange area m 2 Design value: 10;
c: calcium carbide specific heat is 1.088308 kj/(kg. DEG C);
m: the heat exchange mass of the hourly calcium carbide is 6700kg/h;
delta t is the temperature difference in the heat release temperature zone of the calcium carbide particles, and is set to be 575 ℃ according to the actual test result;
t: collecting the total heat of the calcium carbide furnace mouth radiation heat exchange and the total heat collecting time of the calcium carbide granulation in the heat storage and release equipment, wherein the total heat collecting time is set to be 1h;
t 1 : collecting the total heat used by the radiation heat exchange of the calcium carbide furnace mouth for a long time h;
t 2 : and (3) collecting the total heat of the calcium carbide granulation in the heat storage and release equipment for a long time h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499261A (en) * | 2023-04-14 | 2023-07-28 | 合肥合意环保科技工程有限公司 | Comprehensive energy utilization device for calcium carbide production cooling |
| CN117644576A (en) * | 2023-10-20 | 2024-03-05 | 山东大学 | Calcium carbide forming, cooling and waste heat recycling integrated system and working method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116499261A (en) * | 2023-04-14 | 2023-07-28 | 合肥合意环保科技工程有限公司 | Comprehensive energy utilization device for calcium carbide production cooling |
| CN116499261B (en) * | 2023-04-14 | 2023-10-13 | 合肥合意环保科技工程有限公司 | Comprehensive energy utilization device for calcium carbide production cooling |
| CN117644576A (en) * | 2023-10-20 | 2024-03-05 | 山东大学 | Calcium carbide forming, cooling and waste heat recycling integrated system and working method |
| CN117644576B (en) * | 2023-10-20 | 2024-08-09 | 山东大学 | Calcium carbide forming, cooling and waste heat recycling integrated system and working method |
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