CN217764490U - Carbide slag roasting and drying system - Google Patents

Abstract

The utility model relates to a carbide slag roasting and drying system, which comprises a raw material bin, a crushing device, an after-heating furnace and a suspension roasting furnace, wherein the crushing device is connected with the raw material bin and is configured to crush carbide slag from the raw material bin; the heat supplementing furnace is configured to dry carbide slag in the crushing device in a power-adjustable mode; the suspension roasting furnace is configured to roast the crushed carbide slag; and flue gas generated after roasting is configured to be introduced into the crushing device so as to dry the carbide slag in the crushing device. The flue gas through the suspension roaster and the concurrent heating furnace dry the carbide slag, when the water content of the raw material carbide slag fluctuates, the heat can be adjusted by adjusting the power of the concurrent heating furnace, the stability of the fuel and the air quantity required by the suspension roaster is maintained, the drying effect of the carbide slag is ensured, and the production stability and the product quality are ensured.

Description

Carbide slag roasting and drying system

Technical Field

The utility model relates to a chemical building material production technical field, in particular to carbide slag roasting and drying system.

Background

In recent years, with the continuous upgrading of production technology, a large amount of carbide slag is generated in the production process of carbide, the main component of the carbide slag is calcium oxide, and substances such as magnesium, aluminum, iron, silicon and the like may be contained, so that the carbide slag belongs to recyclable substances.

In to carbide slag recycle's multiple approach, just including utilizing the calcination of carbide slag to prepare chemical products, need dry earlier before carrying out the calcination to the carbide slag, in prior art, when the raw materials water content appears undulant, production stability and product quality can fluctuate thereupon.

SUMMERY OF THE UTILITY MODEL

The utility model provides a carbide slag roasting and drying system for solving the problem that exists among the prior art.

According to a first aspect of the present disclosure, there is provided a system for roasting and drying carbide slag, comprising:

a raw material bin;

a crushing device connected with the raw material bin and configured to crush the carbide slag from the raw material bin;

the system comprises an auxiliary heating furnace, a crushing device and a control device, wherein the auxiliary heating furnace is configured to dry carbide slag in the crushing device in a power-adjustable manner;

a suspension roasting furnace configured to roast the crushed carbide slag; and the flue gas generated after roasting is configured to be introduced into the crushing device so as to dry the carbide slag in the crushing device.

In an embodiment of the present disclosure, the holding furnace is a hot blast furnace, and hot blast blown by the hot blast furnace is configured to join with flue gas generated after roasting in the suspension roasting furnace and then is introduced into the crushing device.

In one embodiment of the present disclosure, in a case where the humidity of the carbide slag is less than a threshold value, the carbide slag is dried only by flue gas generated after firing in the suspension firing furnace.

In one embodiment of the present disclosure, when the humidity of the carbide slag is greater than a threshold, the carbide slag is dried by a flue gas generated after the carbide slag is roasted in the suspension roasting furnace and an auxiliary heating furnace.

In one embodiment of the present disclosure, the suspension roasting furnace further comprises a first cyclone separator, wherein the first cyclone separator is configured to be communicated with the outlet of the suspension roasting furnace for gas-solid separation; the separated flue gas is configured to be passed into the breaking device.

In one embodiment of the present disclosure, the system further comprises a preheating system, the preheating system comprises a cyclone preheater, and the carbide slag crushed by the crushing device is configured to enter the suspension roasting furnace for roasting after being preheated by the cyclone preheater.

In one embodiment of the present disclosure, the flue gas separated from the first cyclone is configured to pass through the cyclone preheater to preheat carbide slag located in the cyclone preheater.

In one embodiment of the disclosure, flue gas exiting the cyclone preheater is configured to enter the crushing device for drying the carbide slag in the crushing device.

In one embodiment of the present disclosure, the crushing device further comprises a second cyclone separator, wherein the dried carbide slag in the crushing device is configured to perform gas-solid separation in the second cyclone separator; the separated solid phase enters a cyclone preheater for preheating; the separated flue gas is configured to be collected by a bag-type dust collector.

In one embodiment of the present disclosure, the exhaust fan is communicated with the bag-type dust collector, and the exhaust fan is configured to send the flue gas of the bag-type dust collector into a chimney for exhaust.

The beneficial effect of this disclosure lies in, dry the carbide slag jointly through the flue gas and the concurrent heating stove of the suspension burning furnace of burning, when raw materials carbide slag water content fluctuates, can adjust the heat through the power of adjusting the concurrent heating stove, has maintained the stability of the required fuel of suspension burning furnace and air quantity, has guaranteed the stoving effect to the carbide slag, has guaranteed the quality of the stability of production and product.

Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

Fig. 1 is a schematic structural diagram of a suspension roaster according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a crushing device provided by an embodiment of the disclosure;

FIG. 3 is a schematic diagram of a second cyclone separator provided in an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a cooling system provided by an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an impurity removing device according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a carbide slag roasting and drying system provided in an embodiment of the present disclosure.

The one-to-one correspondence between component names and reference numbers of fig. 1-6 is as follows:

1-raw material bin, 2-suspension roasting furnace, 211-burner, 212-first air inlet, 221-second air inlet, 23-first feed inlet, 24-outlet of suspension roasting furnace, 25-second feed inlet, 3-first cyclone separator, 4-crushing device, 5-reheating furnace, 6-cyclone preheater, 7-second cyclone separator, 81-first cyclone cooler, 82-second cyclone cooler, 83-third cyclone cooler, 9-impurity removal device, 101-bag dust collector, 102-exhaust fan, 103-chimney, 104-conveyor belt, 105-bucket elevator, and 106-finished product bin.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Specific embodiments of the present disclosure are described below with reference to the accompanying drawings.

In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.

In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, the premise that each other exists, and the like.

In this context, "equal", "same", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances as would be understood by a person skilled in the art and allowed for manufacturing or use, etc.

The utility model provides a carbide slag calcination drying system includes former feed bin, breaker, concurrent heating stove and suspension roasting stove, and breaker is connected with former feed bin, and is configured to carry out the breakage with the carbide slag from former feed bin, and the carbide slag after the breakage is powder tiny particle or powder state, and convenient follow-up roasts the carbide slag.

The crushing device also has the effect of drying the crushed carbide slag, the heat for drying the crushing device is provided by an external heat source, the external heat source comprises an arc furnace and a suspension roasting furnace, and the arc furnace dries the crushed carbide slag in the crushing device in a power-adjustable mode. The suspension roasting furnace can generate high-temperature flue gas in the process of roasting the crushed carbide slag, and the flue gas generated after roasting is introduced into the crushing device to dry the carbide slag in the crushing device.

Therefore, the flue gas and the concurrent heating furnace of this disclosure through the suspension roaster dry the carbide slag jointly, have improved the stoving effect to the carbide slag, in addition, when raw materials carbide slag water content takes place undulantly, can adjust the heat through the power of adjusting the concurrent heating furnace, have guaranteed the stability of production and the quality of product.

For easy understanding, specific structures and operation principles of the present disclosure are described in detail below with reference to fig. 1 to 6.

Referring to fig. 1 and 2, in one embodiment of the present disclosure, a system of the present disclosure includes a drying system, a preheating system, a roasting system, a cooling system, a cleaning system, and the like of raw materials. The system of the present disclosure includes a raw material bin 1, a suspension roasting furnace 2, a first cyclone 3.

The raw material bin 1 may be used to store carbide slag, and the specific structure of the raw material bin may be a small, medium, or large warehouse structure common in the art, or a warehouse cluster formed by a plurality of warehouses, and according to specific production requirements, the raw material bin 1 may be used to store other raw materials besides carbide slag, which is not limited to this.

The suspension roasting furnace 2 includes a hearth as a main region for roasting the carbide slag, and the hearth may be divided into a main combustion zone 21 and a burnout zone 22 according to an extending direction of the hearth, and the burnout zone 22 is located above the main combustion zone 21. The main combustion zone 21 is configured to perform oxygen-deficient roasting on the carbide slag from the raw material bin 1, where the oxygen-deficient roasting is understood to mean that the fuel introduced into the main combustion zone 21 generates heat to roast the carbide slag under the condition of oxygen-deficient combustion, and the oxygen-deficient combustion refers to that combustion-supporting air is insufficient to completely burn the fuel so as to reduce nitrogen oxides generated by combination of nitrogen and oxygen under a high-temperature environment, and simultaneously generate a large amount of reducing substances containing HCN, OH, CH and the like in an oxygen-deficient environment, so that the nitrogen oxides can be further reduced, and the nitrogen oxides can be further reduced.

The burnout zone 22 is configured to burn the calcined carbide slag in the primary combustion zone 21, which is understood to mean that the fuel that is not burned in the primary combustion zone 21 is completely burned in the burnout zone 22, and the heat is further increased in the process, so that the calcined carbide slag in the primary combustion zone 21 is further calcined to obtain the final product. In one embodiment of the disclosure, the carbide slag is calcined to calcium oxide after passing through the primary combustion zone and the burnout zone.

It should be noted that, in the present disclosure, the main combustion zone 21 is configured to burn most of the fuel by oxygen-deficient combustion, the reducing substance generated in the process can reduce nitrogen oxides generated in the roasting process, and a small amount of fuel remains in the burnout zone 22, and only a small amount of combustion air is needed to completely burn the fuel.

With continued reference to fig. 1, the main combustion area 21 of the furnace includes a burner 211 extending into the main combustion area, and a first air inlet 212, wherein the burner 211 can introduce fuel, such as fuel gas, pulverized coal, etc., which can provide heat into the main combustion area 21, the burner 211 can also ignite the fuel introduced into the main combustion area 21 in a state of containing combustion air, the first air inlet 212 is configured to introduce combustion air into the main combustion area to provide a combustion environment for the fuel, the first air inlet 212 can also have an adjusting function to adjust the amount of the combustion air introduced into the main combustion area 21, and in the present disclosure, the first air inlet 211 is configured to introduce insufficient combustion air into the main combustion area 21 to make the fuel introduced into the main combustion area 21 perform oxygen-deficient combustion.

Continuing to refer to fig. 1, furnace still includes the first feed inlet 23 with external material pipe intercommunication, and external material pipe is used for carrying the carbide slag that comes from the raw materials storehouse or is the preprocessing equipment who connects the carbide slag, for make better roasting the carbide slag, can carry out corresponding preliminary treatment before roasting the carbide slag, for example, break up the carbide slag raw materials, dry, preheat etc. to improve the calcination effect of carbide slag, conveniently prepare the product. The first feeding hole 23 is located at a corresponding position of the main combustion area 21, for example, the first feeding hole may be located above the burner 211 in the main combustion area 21, so that the carbide slag entering the main combustion area 21 through the first feeding hole 23 falls above the flame emitted by the burner 211 and is carried by the flue gas to move toward the burnout area 22.

With reference to fig. 1, after the carbide slag is roasted in the main combustion area 21, the carbide slag enters the burnout area 22, the burnout area 22 is located at a predetermined height from the burner, a second air inlet 221 is formed in the side wall of the burnout area 22, and the second air inlet 221 is configured to introduce combustion air, so that the fuel entering the burnout area 22 from the main combustion area 21 is completely combusted, the heat is further improved by the complete combustion of the fuel, and the roasting effect of the carbide slag is ensured.

In the process, referring to fig. 1, the flue gas generated by the combustion in the main combustion zone 21 is sprayed upwards, so that the flue gas drives the carbide slag entering the main combustion zone 21 from the first feeding hole 23 to move upwards; the burnout zone 22 is further supplied with combustion air, and when the carbide slag roasted in the main combustion zone 21 is roasted, the generated flue gas further drives the solid phase generated after roasting to move upwards, and finally the solid phase generated by roasting is discharged along with the flue gas from the outlet 24 of the suspension roasting furnace 2.

With reference to fig. 1, the first cyclone separator 3 is communicated with the outlet of the suspension roaster 2, the solid phase generated by roasting the suspension roaster 2 and the flue gas enter the first cyclone separator 3 together, and the first cyclone separator 3 performs gas-solid separation to separate the solid phase, so that the next step of treatment is facilitated.

The separated solid phase is configured to be sent into the suspension roasting furnace 2 in a ratio-adjustable manner for repeated roasting and sent into a cooling system for cooling so as to form active calcium oxide or form overfire calcium oxide according to actual production requirements.

In detail, referring to fig. 1, a second feed port 25 is further opened on the side wall of the suspension roasting furnace 2, and the solid phase outlet end of the first cyclone 3 has two pipes, one of which is communicated with the second feed port 25 to feed the separated solid phase into the suspension roasting furnace 2 for repeated roasting, and the other is communicated with a cooling system to feed the separated solid phase into the cooling system for cooling. The proportion of the solid phase which enters the suspension roaster 2 for repeated roasting and enters the cooling system for cooling can be adjusted by an adjusting device. The adjusting device may be, for example, an adjusting valve, which can feed part of the separated solid phase into the suspension roasting furnace 2 for repeated roasting, and the part of the solid phase enters a cooling system for cooling, thereby obtaining an overfire product, i.e., overfire calcium oxide.

The proportion of the materials entering the suspension roasting furnace 2 can be controlled by the regulating valve, so that the aim of regulating the circulation rate of the materials is fulfilled. Through adjusting suitable material circulation rate, the carbide slag roasting system of the disclosure can be controlled to prepare the over-burnt calcium oxide.

In another embodiment of the present disclosure, the solid phase separated by the first cyclone 3 may not be sent to the suspension roasting furnace 2 for overburning, but all may be sent to a cooling system for cooling. When the carbide slag needs to be roasted to generate active lime, the mixed material from the suspension roasting furnace 2 is separated by the first cyclone separator 3 and then is completely sent to a cooling system for cooling, and the finished product is the active lime. When the calcium carbide slag needs to be roasted to generate the overfire lime, after the mixed material coming out of the suspension roasting furnace 2 is separated by the first cyclone separator 3, part of the mixed material is sent into the suspension roasting furnace 2 for repeated roasting, the circulation frequency can be determined according to specific parameters as long as the overfire lime can be generated, and the overfire lime separated from the first cyclone separator 3 enters a cooling system for cooling.

According to the system disclosed by the invention, on the premise of not increasing the length of the furnace body, the suspension roasting furnace 2 can be used for preparing active lime or over-burnt lime, so that the diversity of roasted products is improved.

In the actual production process, in order to ensure the production quality, before roasting the carbide slag, the carbide slag needs to be correspondingly treated, and referring to fig. 2, in one embodiment of the present disclosure, a crushing device 4 and an auxiliary heating furnace 5 are further included between the raw material bin 1 and the suspension roasting furnace 2. The crushing device 4 is connected with the raw material bin 1 and is configured to crush the carbide slag from the raw material bin 1; the holding furnace 5 is connected to the crushing device 4, and the holding furnace 5 is configured to supply heat to the crushing device 4 in a power-adjustable manner to dry the crushed carbide slag in the crushing device 4. Thus, the suspension roasting furnace 2 is configured to roast the crushed carbide slag, and the flue gas generated by roasting is introduced into the crushing device 4 to dry the carbide slag in the crushing device 4.

Under the configuration, when the water content of the carbide slag changes, the fuel and the air quantity of the suspension roasting furnace 2 can be adjusted without adjusting, and only the concurrent heating furnace is adjusted, so that the working condition of the roasting furnace can be kept stable, and the production stability and the product quality are improved.

In detail, referring to fig. 2, the crushing device 4 may be connected to the raw material silo 1 by means of a conveying device, which may also have a metering function for metering the carbide slag into the crushing device 4, for example a metering belt. The carbide slag in the raw material bin 1 can be conveyed into the crushing device 4 through the conveying equipment, so that the carbide slag can be transferred into the crushing device 4 from the raw material bin 1 in various ways without limitation.

The crushing device 4 has the function of crushing the carbide slag into small powder particles from the bonding material block, and can convert the carbide slag into the small powder particles from the bonding material block in the forms of beating, rolling and the like so as to conveniently roast the carbide slag; breaker 4 still possesses the stoving function simultaneously, and breaker 4 can channel into outside hot flue gas with carbide slag crushing process, dries the heating to the carbide slag to this effect that reaches stoving and preheat, convenient follow-up handles the carbide slag. For example, the crushing device 4 may be a drying crusher, and may crush the carbide slag and dry the crushed carbide slag.

In one embodiment of the disclosure, the source of the external hot air or hot flue gas of the crushing device 4 may be co-fed by the holding furnace 5 and the suspension roasting furnace 2. The hot air furnace 5 can be a hot air furnace, hot air can be generated by combustion, and hot air blown by the hot air furnace can be converged with flue gas generated after roasting of the suspension roasting furnace 2 and then introduced into the crushing device 4 so as to dry the crushed carbide slag in the crushing device 4.

In detail, referring to fig. 2, the gas pipeline from the holding furnace 5 and the gas pipeline from the suspension roasting furnace 2 are merged and jointly enter the gas inlet pipeline of the crushing device 4, so that the crushed carbide slag in the crushing device 4 is jointly dried.

For the drying of the carbide slag, the drying is related to the humidity of the carbide slag, and as the skilled person knows, the smaller the humidity of the carbide slag, the less heat is needed; the greater the moisture content of the carbide slag, the more heat is.

For this reason, in an embodiment of the present disclosure, in a case where the humidity of the carbide slag is less than the threshold, the carbide slag may be dried only by the flue gas generated after the roasting by the suspension roasting furnace 2. That is, when the moisture of the carbide slag is too small, the drying may be performed only by the flue gas generated after the roasting in the suspension roasting furnace 2 without opening the holding furnace 5.

In another embodiment of the present disclosure, when the humidity of the carbide slag is greater than the threshold, the flue gas generated after roasting in the suspension roasting furnace 2 and the holding furnace 5 are used for drying, and when the humidity is greater than the threshold, the crushed carbide slag cannot be completely dried only by the flue gas from the suspension roasting furnace 2, so that the crushed carbide slag needs to be dried together with the hot air in the holding furnace 5.

In the system disclosed by the invention, when the humidity of the carbide slag in the crushing device 4 is relatively high, the carbide slag can be dried together by the flue gas in the suspension roasting furnace 2 and the concurrent heating furnace 5. In addition, the power of the holding furnace 5 is adjustable, so that under the condition that the flue gas inlet amount of the suspension roaster 2 to the crushing device 4 is not changed, the requirement of treating carbide slag with different humidity can be met only by adjusting the power of the holding furnace 5, and the stability of the fuel and air amount required by the suspension roaster 2 is further maintained.

Referring to fig. 2, in an embodiment of the present disclosure, flue gas from the suspension roaster 2 is specifically provided by a first cyclone 3, the first cyclone 3 is communicated with an outlet of the suspension roaster 2, the suspension roaster 2 will discharge a roasted solid phase and flue gas into the first cyclone 3 together, after the first cyclone 2 performs gas-solid separation, the separated flue gas has a high temperature and will be discharged from a gas outlet above the first cyclone 2, and the gas outlet of the first cyclone 3 is communicated with a gas inlet pipeline of the crushing device 4 through a gas pipeline, so that the flue gas discharged from the first cyclone 3 enters the crushing device 4 to dry carbide slag in the crushing device 4.

In an embodiment of the present disclosure, referring to fig. 2, the preheating system further includes a cyclone preheater 6, the carbide slag crushed by the crushing device 4 is configured to enter the suspension roaster 2 for roasting after being preheated by the cyclone preheater 6, and the crushed carbide slag needs to be preheated before the suspension roaster 2 roasts the crushed carbide slag.

In detail, the cyclone preheater 6 may transfer heat from an external heat source to the crushed carbide slag entering the cyclone preheater 6, thereby achieving the purpose of preheating the crushed carbide slag.

In one embodiment of the present disclosure, referring to fig. 2, the gas outlet of the first cyclone 3 is in communication with the gas inlet of the cyclone preheater 6 through a gas duct, and the flue gas separated from the first cyclone 3 is configured to pass through the cyclone preheater 6 to preheat the carbide slag located in the cyclone preheater 6.

In one embodiment of the present disclosure, referring to fig. 2, the gas outlet of the cyclone preheater 6 is communicated with the gas inlet channel of the crushing device 4 through a gas channel, and after the carbide slag is preheated by the flue gas from the cyclone preheater 6, the temperature can be reduced to be suitable for drying the carbide slag in the crushing device 4. I.e. the flue gas coming out of the cyclone preheater 6 is arranged to enter the crushing device 4 for drying the carbide slag in the crushing device 4. Similarly, the carbide slag is dried in the crushing device 4 and then enters the cyclone preheater 6 for preheating, so that the preheating temperature of the carbide slag is increased until the carbide slag meets the temperature of the carbide slag entering the suspension roaster 6.

The cyclone preheater 6 may comprise at least one, or at least two, to gradually preheat the carbide slag before entering the suspension roaster 6 in a stepwise manner until reaching the standard of entering the suspension roaster 6. Likewise, the flue gas separated by the first cyclone 3 may be cooled down step by these cyclone preheaters 6 until reaching the standard for entering the crushing device 4, and the number of cyclone preheaters 6 is not specifically limited in this disclosure.

In the two embodiments, referring to fig. 2, the flue gas enters the cyclone separator 6 and the crushing device 4 in sequence from the first cyclone separator 3, and is used for preheating the carbide slag in the cyclone separator 6 and drying the carbide slag crushed in the crushing device 4, the flue gas is high-temperature flue gas generated after roasting in the suspension roaster 2, and the external heat of the cyclone preheater 6 is completely provided by the high-temperature flue gas.

In one embodiment of the present disclosure, the second cyclone separator 7 is further included, the second cyclone separator 7 is connected between the crushing device 4 and the cyclone preheater 6, the crushed carbide slag and the flue gas in the crushing device 4 are sent to the second cyclone separator 7 in a form of a gas-solid mixture, the second cyclone separator 7 performs gas-solid separation on the gas-solid mixture, the separated solid phase is sent to the cyclone preheater 6 for preheating, and the separated flue gas is configured to be discharged from the gas outlet of the second cyclone separator 7 to the bag-type dust collector 8 for collection.

The bag-type dust collector is provided with an air inlet, a filter element and an air outlet, after the flue gas is introduced into the bag-type dust collector, suspended impurities in the flue gas can be filtered and collected through the filter element, and the filtered flue gas can be discharged through the air outlet of the bag-type dust collector.

In detail, most of the separated solid phase is crushed carbide slag, and the crushed carbide slag in the gas-solid mixture can be separated through the second cyclone separator 7; solid impurities in the separated flue gas are collected through the bag-type dust collector, so that direct discharge can be avoided, and the environment is polluted.

In one embodiment of the present disclosure, referring to fig. 3, the second cyclone separator 7 is in communication with a bag-type dust collector 101, and further includes an exhaust fan 102 in communication with the bag-type dust collector, wherein the exhaust fan 102 is configured to send the flue gas in the bag-type dust collector 101 to a chimney 103 for exhaust.

In detail, an air inlet of the exhaust fan 102 is connected to an air outlet of the bag-type dust collector 101, and the exhaust fan 102 provides negative pressure to the air outlet of the bag-type dust collector 101 through the air inlet in a working state, which can be understood that the exhaust fan 102 extracts the filtered flue gas in the bag-type dust collector 101, and the air outlet of the exhaust fan 102 is communicated with the chimney 103 to blow the filtered flue gas out of the chimney 103, so as to achieve the purpose of discharging.

In the above embodiment, the roasting process of the suspension roasting furnace 2 on the carbide slag and the treatment process of the carbide slag before roasting are explained in detail, the solid phase entering the cooling system from the suspension roasting furnace 2 is the roasted product, and the cooling, impurity removing and collecting processes of the roasted product will be further explained with reference to the structure and the embodiment of the present disclosure.

Referring to fig. 4, in an embodiment of the present disclosure, the cooling system includes at least one stage of cyclone cooler, for example, a three-stage cyclone cooler, including a first cyclone cooler 81, a second cyclone cooler 82, and a third cyclone cooler 83, and the calcined product passes through the first cyclone cooler 81, the second cyclone cooler 82, and the third cyclone cooler 83 in sequence, and is finally reduced to the required temperature.

It should be noted that, at least one stage of cyclone cooler is configured to gradually cool the roasted product and is also configured to introduce the hot air generated in the cooling process into the suspension roasting furnace, so that on one hand, the hot air contributes to increasing the temperature, and on the other hand, an air supplement device is not required to be added to the suspension roasting furnace 2, thereby reducing the occupied space.

In detail, the cyclone cooler is based on the principle of reducing the temperature of the calcined product by sucking external air and causing the external air to exchange heat with the calcined product introduced into the cyclone cooler.

In the cooling process, the heat exchange is carried out between the external air and the solid phase in a high-temperature state, the external air exchanges heat with the solid phase after passing through the cyclone cooler, and the heated external air enters the suspension roasting furnace to be used as combustion-supporting air auxiliary fuel for combustion.

In more detail, referring to fig. 4, the discharge port of the first cyclone 3 is communicated with the feed port of the first cyclone 81, and the discharge ports of the first cyclone 81, the second cyclone 82 and the third cyclone 83 are communicated with the feed port sequentially through pipes, so that the solid phase from the first cyclone 3 can sequentially pass through the first cyclone 81, the second cyclone 82 and the third cyclone 83, and is cooled to a suitable temperature in the third cyclone 83 for subsequent treatment.

Referring to fig. 4, the external air flows reversely pass through the three-stage cooler and finally enter the suspension roasting furnace 2 as combustion air, that is, the air outlets and the air inlets of the third cyclone cooler 83, the second cyclone cooler 82 and the first cyclone cooler 81 are sequentially communicated through the air pipes, and the external air flows sequentially pass through the third cyclone cooler 83, the second cyclone cooler 82 and the first cyclone cooler 81, so as to achieve the purpose of cooling the solid phase.

In detail, referring to fig. 4, the air outlet of the first cyclone cooler 81 is in communication with the first air inlet 212 of the suspension roasting furnace 2 to provide combustion air to the main combustion zone 21 of the suspension roasting furnace 2; the second cyclone cooler 82 comprises two air outlets, one of which is in communication with the air inlet of the first cyclone cooler 81 and the other of which is in communication with the second air inlet 221 of the suspension calciner 2, whereby combustion air is supplied to the burnout zone 22 of the suspension calciner 2 so that the fuel in the suspension calciner 2 is completely combusted.

Therefore, the external airflow is preheated after sequentially passing through at least one stage of cyclone cooler in a reverse direction, and the preheated airflow at least partially passes through the main combustion zone 21 so as to carry out oxygen-deficient roasting on the carbide slag from the raw material bin in the main combustion zone 21; the preheated gas stream is at least partially passed into the burnout zone 22 so that the burnout zone 22 roasts the under-oxygen burned carbide slag. Combustion-supporting air is provided for the suspension roasting furnace 2 through the at least one stage of cyclone cooler, and the combustion-supporting air is preheated in the at least one stage of cyclone cooler, so that the combustion-supporting air can provide part of heat for the suspension roasting furnace 2, and the utilization rate of resources is improved.

In one embodiment of the present disclosure, referring to fig. 5, the apparatus further includes an impurity removing device 9, the impurity removing device 9 is communicated with the discharge port of the third cyclone cooler 83, and is configured to remove impurities from the solid phase cooled by the cyclone cooler 83.

In detail, referring to fig. 5, the impurity removing device 9 is a winnowing machine configured to screen the solid phase by winnowing and blow the screened solid phase into a bag-type dust collector 101, the bag-type dust collector 101 filters and collects the winnowing solid phase, and the collected solid phase is transported to a finished product bin by a transporting device for storage.

In one embodiment of the present disclosure, referring to fig. 5, the conveying device includes a conveying belt 104 and a bucket elevator 105, the conveying belt 104 is located below the bag-type dust collector 101, the solid phase collected by the bag-type dust collector 101 is discharged through a discharge port below, the conveying belt 104 carries the solid phase falling from the bag-type dust collector 101 and conveys the solid phase to the bucket elevator 105; the hopper 105 is configured to feed the solid phase conveyed by the conveyor 104 into the finished goods bin 106 for storage.

Of course, it is obvious to those skilled in the art that the collected solid phase may be transferred to a finished product warehouse for storage in other ways, which is not limited to this.

In one embodiment of the present disclosure, referring to fig. 5, the system further includes an exhaust fan 102 in communication with the bag-type dust collector 101, wherein the exhaust fan 102 is configured to send the flue gas in the bag-type dust collector 101 to a chimney 103 for exhaust.

In detail, when the solid phase enters the impurity removing device 9, some smoke may accompany, the bag-type dust collector 101 may filter and collect the solid phase, and may separate and discharge the smoke, and the discharged smoke is discharged into the chimney 103 through the exhaust fan 102 to be discharged.

In an embodiment of the present disclosure, referring to fig. 6, the raw material bin 1, the crushing device 4, the cyclone preheater 6, the suspension roasting furnace 2, the cooling system, and the impurity removal device 9 are sequentially communicated, so that the preparation of a solid phase through the carbide slag is realized, and therefore, the carbide slag is sequentially subjected to crushing, preheating, roasting, cooling, and impurity removal, and finally a solid phase product meeting requirements is obtained, and the solid phase product may be activated calcium oxide, overfire calcium oxide, or the like prepared through the carbide slag.

It should be noted that the connection relationship of all the devices in the present embodiment is the same as the connection relationship, the structure and the function of the devices in the above embodiments, and the operation of each device in the present embodiment can be completely inferred from the description in the above embodiments.

According to the system, the calcined finished product is subjected to powder selection and impurity removal, the impurity removal and powder selection load is reduced due to the fact that the material is decomposed, investment and operating cost are saved, and meanwhile, the problem that more qualified materials are removed along with impurities due to the fact that the materials are agglomerated and caked before the impurity removal is conducted is avoided, and the yield of the qualified products is reduced.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims (10)

1. The utility model provides a carbide slag calcination drying system which characterized in that includes:

a raw material bin;

a crushing device connected with the raw material bin and configured to crush the carbide slag from the raw material bin;

the system comprises an auxiliary heating furnace, a crushing device and a control device, wherein the auxiliary heating furnace is configured to dry carbide slag in the crushing device in a power-adjustable manner;

a suspension roasting furnace configured to roast the crushed carbide slag; and the flue gas generated after roasting is configured to be introduced into the crushing device so as to dry the carbide slag in the crushing device.

2. The carbide slag roasting and drying system according to claim 1, wherein the holding furnace is a hot blast stove, and hot blast air blown by the hot blast stove is configured to be merged with flue gas generated after roasting of the suspension roasting furnace and then introduced into the crushing device.

3. The system for roasting and drying carbide slag according to claim 1, wherein the carbide slag is dried only by flue gas generated after roasting in the suspension roasting furnace in a case where the humidity of the carbide slag is less than a threshold value.

4. The system for roasting and drying carbide slag according to claim 1, wherein when the humidity of the carbide slag is greater than a threshold value, the carbide slag is dried by flue gas generated after roasting in the suspension roasting furnace and an auxiliary heating furnace.

5. The carbide slag roasting drying system of claim 1, further comprising a first cyclone separator configured to communicate with an outlet of the suspension roasting furnace for gas-solid separation; the separated flue gas is configured to be passed into the breaking device.

6. The system for roasting and drying carbide slag according to claim 5, further comprising a preheating system, wherein the preheating system comprises a cyclone preheater, and the carbide slag crushed by the crushing device is configured to enter the suspension roasting furnace for roasting after being preheated by the cyclone preheater.

7. The carbide slag roasting drying system of claim 6, wherein flue gas separated from the first cyclone is configured to pass through the cyclone preheater to preheat carbide slag located in the cyclone preheater.

8. The system of claim 7, wherein flue gas from the cyclone preheater is configured to enter the crushing device to dry the carbide slag in the crushing device.

9. The system for roasting and drying carbide slag according to claim 8, further comprising a second cyclone separator, wherein the carbide slag dried in the crushing device is configured to be subjected to gas-solid separation in the second cyclone separator; the separated solid phase enters a cyclone preheater for preheating; the separated flue gas is configured to be collected by a bag-type dust collector.

10. The carbide slag roasting and drying system of claim 9, further comprising an exhaust fan in communication with the bag-type dust remover, the exhaust fan configured to send flue gas of the bag-type dust remover to a chimney for exhaust.

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