Energy-saving aluminum hydroxide suspension roasting device

Abstract

The utility model discloses an energy-saving aluminum hydroxide suspension roasting device which comprises a cooling assembly, a preheating assembly, a suspension roasting furnace, an SCR (Selective Catalytic Reduction) reactor, a dryer, a feeding assembly, an exhaust emission assembly and a heat supply device, the cooling assembly comprises a fourth-stage cyclone cooler, a third-stage cyclone cooler, a second-stage cyclone cooler and a first-stage cyclone cooler which are connected in sequence, and an air outlet of the first-stage cyclone cooler is communicated with an inlet of the suspension roasting furnace; the preheating assembly comprises a third-stage preheater, a second-stage preheater, a first-stage preheater and a first-stage preheater which are sequentially connected, the suspension roaster is communicated with the third-stage preheater, the first-stage preheater is communicated with the SCR reactor, the SCR reactor is communicated with the dryer, the dryer is communicated with the first-stage preheater, and the first-stage preheater is communicated with the waste gas emission assembly; the heat supply device can provide heat for the SCR reactor. The utility model can reduce the heat energy loss.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminium hydroxide calcining furnace technical field especially is related to an energy -conserving aluminium hydroxide suspension calcining device. BACKGROUND

[0002] In the aluminium hydroxide calcining production alumina industry has used the vertical furnace, rotary kiln, fluidized bed furnace and so on its heat consumption is very high, has used aluminium hydroxide suspension calcining furnace in recent decades, and the heat consumption of per ton alumina can only be made to 2.75GJ at the lowest, facing the increasingly fierce competition, and reducing heat consumption is the survival of enterprise.

[0003] The prior art patent number for 200910012849.X discloses "aluminium hydroxide suspension calcining furnace and in production plant layout", including by the aluminium hydroxide feeding mechanism that gives the storehouse, electronic quantitative feeder and screw feeder, venturi dryer, the suspension calcining mechanism that is made of first, second, third grade cyclone preheater and suspension calcining furnace, first, second, third, fourth grade cyclone cooler, fluidized cooling device, dust collection and return dust mechanism and U-shaped connecting pipe and connecting pipeline.Screw feeder connects venturi dryer, first grade cyclone preheater connects venturi dryer discharge end, second grade cyclone preheater discharge end connects suspension calcining furnace feed end, suspension calcining furnace discharge end connects second grade cyclone preheater feed end, third grade cyclone preheater connects U-shaped connecting pipe, and U-shaped connecting pipe connects first grade cyclone cooler and second grade cyclone cooler.First grade cyclone preheater connects the electric precipitator of dust collection, exhaust is sent to the chimney by the air blower, and dust is returned to the production process by the roots blower, is discharged by the pipeline ash valve, and the whole set of calcining furnace layout is in six-storey plant.

[0004] But because only one second grade cyclone preheater is arranged in the above prior art, i.e. the material from first grade cyclone preheater only passes through heat exchange once and enters the suspension calcining furnace, and the hot gas from second grade cyclone preheater to venturi dryer only passes through the cooling of second grade cyclone preheater once, so the flue gas from the chimney is relatively high, thereby causing heat waste and poor energy saving effect.

[0005] Therefore, there is an urgent need in the art for an energy -conserving aluminium hydroxide suspension calcining device to solve the above problems. UTILITY MODEL CONTENT

[0006] The utility model aims at providing an energy -conserving aluminium hydroxide suspension calcining device to solve the problems existing in the above prior art, which can effectively reduce heat loss and achieve the technical effect of energy saving.

[0007] To achieve the above object, the utility model provides the following scheme:

[0008] The utility model discloses an energy -conserving aluminium hydroxide suspension calcination device, including cooling assembly, preheating component, suspension calcination furnace, SCR reactor, dryer, feeding assembly, exhaust emission component and heat supply device,

[0009] Cooling assembly includes four stage cyclone cooler, three stage cyclone cooler, two stage cyclone cooler and one stage cyclone cooler, the import of four stage cyclone cooler is linked together with outside atmosphere, the gas outlet of four stage cyclone cooler is linked together with the import of three stage cyclone cooler, the gas outlet of three stage cyclone cooler is linked together with the import of two stage cyclone cooler, the gas outlet of two stage cyclone cooler is linked together with the import of one stage cyclone cooler, the gas outlet of one stage cyclone cooler is linked together with the import of suspension calcination furnace, the discharge port of one stage cyclone cooler is linked together with the import of two stage cyclone cooler, the discharge port of two stage cyclone cooler is linked together with the import of three stage cyclone cooler, the discharge port of three stage cyclone cooler is linked together with the import of four stage cyclone cooler,

[0010] Preheating component includes three stage preheater, two stage preheater, one stage preheater and first stage preheater, the gas outlet of suspension calcination furnace is linked together with the import of three stage preheater, the gas outlet of three stage preheater is linked together with the import of two stage preheater, the gas outlet of two stage preheater is linked together with the import of one stage preheater, the gas outlet of one stage preheater is linked together with the import of SCR reactor, the gas outlet of SCR reactor is linked together with the import of dryer, the outlet of dryer is linked together with the import of first stage preheater, the gas outlet of first stage preheater is linked together with exhaust emission component, the discharge port of first stage preheater is linked together with the import of one stage preheater, the discharge port of one stage preheater is linked together with the import of two stage preheater, the discharge port of two stage preheater is linked together with the import of suspension calcination furnace, the discharge port of suspension calcination furnace is linked together with the import of three stage preheater,

[0011] The heat supply device can provide heat for the SCR reactor.

[0012] Preferably, the cooling assembly further comprises an indirect cooler, and the discharge port of the four-stage cyclone cooler is connected to the import of the indirect cooler.

[0013] Preferably, the exhaust emission component comprises a dust remover, an induced draft fan and a chimney, the import of the dust remover is connected to the gas outlet of the first stage preheater, the gas outlet of the dust remover is connected to the chimney, and the induced draft fan is arranged on a pipeline between the dust remover and the chimney.

[0014] Preferably, the ash outlet of the dust collector is provided with a dust returning device, and the ash outlet of the dust returning device is communicated with the inlet of the first-stage cyclone cooler.

[0015] Preferably, the feeding assembly comprises a raw material bin, a metering scale and a feeder, the metering scale is arranged below the discharge port of the raw material bin, the output end of the metering scale is connected with the feeding end of the feeder, and the discharge end of the feeder is connected with the inlet of the dryer.

[0016] Preferably, the discharge port of the feeder is communicated with the dryer through two parallel feeding conveying pipelines.

[0017] The discharge port of the first-stage preheater is provided with two first-stage material conveying pipelines, and the inlets of the first-stage preheaters are communicated with the inlets of the first-stage preheaters.

[0018] The discharge port of the second-stage preheater is provided with two second-stage material conveying pipelines, and the inlets of the second-stage preheaters are communicated with the inlets of the suspension calcining furnaces.

[0019] Preferably, the first-stage preheater is provided with two.

[0020] Preferably, a residence tank is further arranged between the discharge port of the third-stage preheater and the inlet of the first-stage cyclone cooler.

[0021] Preferably, the heat supplementing device is a dryer station.

[0022] The outer wall of the third-stage cyclone cooler is provided with a cooling jacket, and the gas outlet of the cooling jacket is connected with the dryer station through a pipeline.

[0023] Compared with the prior art, the utility model discloses the following technical effects:

[0024] The utility model discloses a kind of energy-saving aluminium hydroxide suspension calcining devices, the utility model is provided with first-stage preheater and second-stage preheater after first-stage preheater, and material is fully preheated by double preheating effect, to reduce the energy consumption of suspension calcining furnace, play the role of energy saving, product burns and reduces qualified when suspension calcining furnace temperature reduces to ≤800 ℃.Meanwhile, the gas temperature of first-stage preheater feeding to SCR reactor also reduces, so that the exhaust gas temperature of final induced draft fan is reduced, and reduce to 130 ℃ below.

[0025] Further, part of sensible heat in the cooling jacket on the outer wall of the third-stage cyclone cooler is recovered as combustion-supporting air of the dryer, and hot flue gas generated by fuel ensures that the flue gas temperature of induced draft fan is not more than 130 ℃ when supplementing to the inlet of SCR reactor, so as to ensure the minimum use temperature of denitration catalyst and dryer.

[0026] Further, the first-stage preheater adopts multi-branch entering the first-stage preheater, the second-stage preheater adopts multi-branch entering the suspension calcining furnace, and the feeder adopts multi-branch entering the dryer, so that the material is dispersed more uniformly, thereby better heat exchange with flue gas and improving heat transfer efficiency.

[0027] Finally, the entire device adopts various energy-saving measures, so that the energy consumption of producing one ton of alumina is reduced by 0.1 GJ / t compared with the original energy consumption of the aluminum hydroxide calcining furnace with the lowest energy consumption, which is equivalent to 3.4 kg of standard coal, and the heat consumption of the 4000-ton calcining furnace per day can be reduced by 13.6 tons of standard coal, and the heat consumption of the 1300000-ton alumina production per year can be reduced by 4420 tons of standard coal, thereby bringing considerable economic benefits to the enterprise. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0029] Figure 1 The structure diagram of the energy-saving aluminum hydroxide suspension calcining device of embodiment one is shown in the figure.

[0030] In the figure: 1 - indirect cooler; 2 - four-stage cyclone cooler; 3 - three-stage cyclone cooler; 4 - two-stage cyclone cooler; 5 - one-stage cyclone cooler; 6 - residence tank; 7 - three-stage preheater; 8 - suspension calcining furnace; 9 - two-stage preheater; 10 - one-stage preheater; 11 - first-stage preheater; 12 - SCR reactor; 13 - dryer; 14 - raw material bin; 15 - feeder; 16 - metering scale; 17 - dust remover; 18 - ash returning device; 19 - induced draft fan; 20 - chimney; 21 - first burner; 22 - second burner; 23 - third burner; 24 - dryer station. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0032] The purpose of the present application is to provide an energy-saving aluminum hydroxide suspension calcining device to solve the problems in the prior art and effectively reduce heat loss, thereby achieving the technical effect of energy saving.

[0033] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] like Figure 1 As shown, this embodiment provides an energy-saving aluminum hydroxide suspension roasting device, including a cooling component, a preheating component, a suspension roasting furnace 8, an SCR reactor 12, a dryer 13, a feeding component, a waste gas emission component, and a heat supply device. The connection relationships between the various structures are as follows:

[0036] The cooling system includes a four-stage cyclone cooler 2, a three-stage cyclone cooler 3, a two-stage cyclone cooler 4, and a one-stage cyclone cooler 5. The inlet of the four-stage cyclone cooler 2 is connected to the outside atmosphere. The outlet of the four-stage cyclone cooler 2 is connected to the inlet of the three-stage cyclone cooler 3 via a pipe. The outlet of the three-stage cyclone cooler 3 is connected to the inlet of the two-stage cyclone cooler 4 via a pipe. The outlet of the two-stage cyclone cooler 4 is connected to the inlet of the one-stage cyclone cooler 5 via a pipe. The outlet of the one-stage cyclone cooler 5 is connected to the inlet of the suspension roasting furnace 8 via a pipe. The outlet of the one-stage cyclone cooler 5 is connected to the inlet of the two-stage cyclone cooler 4 via a pipe. The outlet of the two-stage cyclone cooler 4 is connected to the inlet of the three-stage cyclone cooler 3 via a pipe. The outlet of the three-stage cyclone cooler 3 is connected to the inlet of the four-stage cyclone cooler 2 via a pipe.

[0037] The preheating assembly includes a tertiary preheater 7, a secondary preheater 9, a primary preheater 10, and a first-stage preheater 11. The outlet of the suspension roasting furnace 8 is connected to the inlet of the tertiary preheater 7 via a pipeline. The outlet of the tertiary preheater 7 is connected to the inlet of the secondary preheater 9 via a pipeline. The outlet of the secondary preheater 9 is connected to the inlet of the primary preheater 10 via a pipeline. The outlet of the primary preheater 10 is connected to the inlet of the SCR reactor 12 via a pipeline. The outlet of the SCR reactor 12 is connected to the inlet of the dryer 13 via a pipeline. The outlet of the dryer 13 is connected to the inlet of the first-stage preheater 11 via a pipeline. The outlet of the first-stage preheater 11 is connected to the exhaust gas emission assembly via a pipeline. The discharge port of the primary preheater 11 is connected to the inlet of the primary preheater 10 via a pipeline. The discharge port of the primary preheater 10 is connected to the inlet of the secondary preheater 9 via a pipeline. The discharge port of the secondary preheater 9 is connected to the inlet of the suspension roasting furnace 8 via a pipeline. The discharge port of the suspension roasting furnace 8 is connected to the inlet of the tertiary preheater 7. The discharge port of the tertiary preheater 7 can be connected to the inlet of the primary cyclone cooler 5 via a pipeline.

[0038] It should be noted that the four-stage cyclone cooler 2, the three-stage cyclone cooler 3, the two-stage cyclone cooler 4, the one-stage cyclone cooler 5, the three-stage preheater 7, the two-stage preheater 9, the one-stage preheater 10 and the primary preheater 11 are all the same structure, only because of the different positions, their functions are slightly different, and they are all the existing cyclone cooler structure (also known as a cyclone separator), which includes an inlet, an air outlet and a material outlet, and the inlet can be used for air and material.

[0039] The heat supply device can provide heat for the SCR reactor 12 and the dryer 13 behind it, and the dryer 13 is the existing Venturi dryer.

[0040] In actual use, the waste gas exhaust assembly can be started to exhaust the entire system, so that the external cold air enters the four-stage cyclone cooler 2, the three-stage cyclone cooler 3, the two-stage cyclone cooler 4, the one-stage cyclone cooler 5, the suspension calciner 8, the three-stage preheater 7, the two-stage preheater 9, the one-stage preheater 10, the SCR reactor 12, the dryer 13, the primary preheater 11 and the waste gas exhaust assembly in turn, and then is discharged into the atmosphere. Then the feeding assembly is started to deliver the material to the dryer 13, and the material is mixed and dried with the flue gas after denitrification by the SCR reactor 12 in the dryer 13, and the dried flue gas and the material enter the primary preheater 11 for further heat exchange and gas-solid separation, and the separated dust-containing flue gas enters the waste gas exhaust assembly; the material after the gas-solid separation and preheating of the primary preheater 11 enters the one-stage preheater 10, the two-stage preheater 9, the suspension calciner 8 and the three-stage preheater 7 in turn, and the produced material is discharged through the one-stage cyclone cooler 5, the two-stage cyclone cooler 4, the three-stage cyclone cooler 3 and the four-stage cyclone cooler 2 in turn.

[0041] In this embodiment, the cooling assembly further includes an indirect cooler 1, which can adopt the existing fluidized cooler. The material outlet of the four-stage cyclone cooler 2 is connected with the inlet of the indirect cooler 1, that is, the material flowing out of the four-stage cyclone cooler 2 will be further cooled by the indirect cooler 1, and then delivered out.

[0042] In this embodiment, the waste gas exhaust assembly includes a dust collector 17, an induced draft fan 19 and a chimney 20. The dust collector 17 can be the existing electrostatic dust collector 17, and of course other types of dust collection structures can also be selected by those skilled in the art. The inlet of the dust collector 17 is connected with the air outlet of the primary preheater 11, the air outlet of the dust collector 17 is connected with the chimney 20, and the induced draft fan 19 is arranged on the pipeline between the dust collector 17 and the chimney 20. The induced draft fan 19 provides negative pressure power for the entire system, so that the external air can be sucked from the inlet of the four-stage cyclone cooler 2.

[0043] In this embodiment, the dust collector 17 is equipped with a dust return device 18 at its ash outlet. The dust return device 18 is a commonly used device in existing suspension roasting furnaces 8. The ash outlet of the dust return device 18 is connected to the inlet of the primary cyclone cooler 5. The dust return device 18 sends the collected dust into the inlet of the primary cyclone cooler 5 and mixes it with the product from the residence tank 6 and high-temperature air, removing the water of crystallization in the dust return and ensuring that the dust return ignition reduction meets the product requirements.

[0044] In this embodiment, the feeding assembly includes a raw material silo 14, a weighing scale 16, and a feeder 15. The weighing scale 16 is an existing belt scale, which can both weigh the material and transport it to the next workstation. The weighing scale 16 is located below the discharge port of the raw material silo 14, and its output end is connected to the feed end of the feeder 15. The feeder 15 is an existing screw feeder, and its discharge end is connected to the inlet of the dryer 13.

[0045] In this embodiment, the discharge port of the feeder 15 is connected to the dryer 13 through two parallel feeding pipelines; or, two feeders 15 can be set at the discharge end of the weighing scale 16, so that separate feeding can also be achieved.

[0046] Similarly, such as Figure 1 As shown, the discharge port of the primary preheater 11 is equipped with two primary material conveying pipelines. The ends of these pipelines furthest from the primary preheater 11 are connected to the inlet of the primary preheater 10. Specifically, one end of each primary material conveying pipeline is connected to the pipeline between the primary preheater 10 and the secondary preheater 9. Under the action of gas supplied from the secondary preheater 9 to the primary preheater 10, the material is blown into the primary preheater 10. Similarly, the pipeline supplying material from the primary preheater 10 to the secondary preheater 9 is connected to the pipeline supplying gas from the tertiary preheater 7 to the secondary preheater 9, and under the action of the supplied gas, the material is conveyed into the secondary preheater 9.

[0047] Similarly, the discharge port of the secondary preheater 9 is equipped with two secondary material conveying pipelines. The ends of the two secondary material conveying pipelines away from the secondary preheater 9 are connected to the feed port of the suspension roasting furnace 8. The secondary preheater 9 conveys materials to the suspension roasting furnace 8 through the two secondary material conveying pipelines.

[0048] The reason for setting up two feeding pipelines, two primary material conveying pipelines, and two secondary material conveying pipelines is to distribute the material more evenly, so that it can fully contact the flue gas, thereby enhancing the heat exchange effect, improving the heat transfer efficiency, and laying a solid foundation for reducing the energy consumption of the entire system.

[0049] In the embodiment, two first-stage preheaters 11 are provided, and the two first-stage preheaters 11 are arranged in parallel with each other, i.e., the two first-stage preheaters 11 have the same connection relationship with the exhaust emission assembly, the first-stage preheater 10 and the dryer 13.

[0050] In the embodiment, a residence tank 6 is further arranged between the discharge port of the third-stage preheater 7 and the inlet of the first-stage cyclone cooler 5. The residence tank 6 is a closed container, which is divided into an upper chamber and a lower chamber. The upper end and the lower end of the upper chamber are staggered with baffles, so as to increase the flow path of the material. The lower chamber can be used to introduce compressed air. The residence tank 6 can make the material continue to maintain a high temperature for a period of time, so as to produce the final product in the residence tank 6. More importantly, because the residence tank 6 is arranged, the combustion temperature of the suspension calciner 8 can be appropriately reduced, thereby achieving the effect of energy saving.

[0051] In the embodiment, the heat supply device is a dryer station 24 (or a dryer), which can provide heat for the SCR reactor 12.

[0052] A cooling jacket is arranged on the outer wall of the third-stage cyclone cooler 3. Compressed air is introduced into the inlet of the cooling jacket, and the outlet of the cooling jacket is connected with the dryer station 24 through a pipeline. The compressed air can absorb the heat inside the third-stage cyclone cooler 3 through the cooling jacket, and then is transported to the dryer station 24 to provide combustion-supporting air with a suitable temperature for the dryer station 24. The reason why the cooling jacket is arranged only on the outer wall of the third-stage cyclone cooler 3 is that the internal temperature of the second-stage cyclone cooler 4 is relatively high, the internal temperature of the fourth-stage cyclone cooler 2 is relatively low, and only the internal temperature of the third-stage cyclone cooler 3 is relatively appropriate.

[0053] Embodiment Two

[0054] The embodiment provides a calcination method of an energy-saving type aluminum hydroxide suspension calciner. The method is based on the energy-saving type aluminum hydroxide suspension calciner disclosed in Embodiment One and comprises the following steps.

[0055] Step One: Start the induced draft fan 19 and the dust collector 17, so that cold air enters the fourth-stage cyclone cooler 2, the third-stage cyclone cooler 3, the second-stage cyclone cooler 4, the first-stage cyclone cooler 5, the suspension calciner 8, the third-stage preheater 7, the second-stage preheater 9, the first-stage preheater 10, the SCR reactor 12, the dryer 13, the first-stage preheater 11, the dust collector 17, the induced draft fan 19 and the chimney 20 in sequence, and then is discharged into the atmosphere.

[0056] Step Two: Adjust the air volume of the induced draft fan 19 to adjust the negative pressure of the suspension calciner 8 to a suitable pressure for ignition, and start the first burner 21 to slowly heat the suspension calciner 8, such as Figure 1As shown, the first burner 21 is arranged on the pipeline through which the second preheater supplies gas to the first preheater, and the first burner 21 is used to heat the lining in the pipeline between the second preheater and the suspension calciner 8, and the purpose of slow heating is to preheat in advance and avoid damage to the suspension calciner 8 due to excessively high temperature. When the temperature at the top of the suspension calciner 8 cannot rise any more, the second burner 22 is started, and the second burner 22 is a premix burner. After the second burner 22 is adjusted to the maximum combustion capacity, the third burner 23 is started, and the second burner 22 and the third burner 23 are arranged at the gas inlet. When the temperature at the top of the suspension calciner 8 is greater than 500℃, the preparation of the aluminum hydroxide raw material is ready to be put in.

[0057] Step three: the raw material in the raw material bin 14 is sent into the dryer 13 through the metering scale 16 and the feeder 15, the material is mixed and dried with the high-temperature flue gas after denitrification in the SCR reactor 12, the dried flue gas and the material enter the first-stage preheater 11 for further heat exchange and gas-solid separation, the separated dust-containing flue gas enters the dust collector 17, and the separated powder material enters the dust returning device 18. The flue gas purified by the dust collector 17 is sent into the chimney 20 by the induced draft fan 19 and finally discharged into the atmosphere, and the dust collected by the dust returning device 18 is sent into the inlet of the first-stage cyclone cooler 5 and mixed with the material and gas from the residence tank 6, and the crystal water in the returned dust is removed, so that the loss on ignition of the returned dust reaches the product requirement.

[0058] Step four: the material after gas-solid separation and preheating in the first-stage preheater 11 enters the first-stage preheater 10, the second-stage preheater 9, the suspension calciner 8, the third-stage preheater 7 and the residence tank 6 in sequence, and qualified alumina products are produced. The alumina products are discharged from the residence tank 6 and then pass through the first-stage cyclone cooler 5, the second-stage cyclone cooler 4, the third-stage cyclone cooler 3 and the fourth-stage cyclone cooler 2 in sequence, so that the material is cooled to about 200℃ and then enters the indirect cooler 1 for final cooling to below 80℃.

[0059] Step five: when the third-stage cyclone cooler 3 passes through the high-temperature alumina, compressed air is introduced into the cooling jacket, the heated air is transported to the dryer station 24 through a pipeline, and finally sent to the dryer 13 to supplement the heat of the dryer 13, thereby achieving the technical effect of waste heat recovery.

[0060] Step six: when the feeding load is greater than 90%, the flue gas temperature from the first-stage preheater 10 is insufficient for the SCR denitrification catalyst reaction temperature and the drying material temperature, so the dryer station 24 is started, and the hot flue gas after combustion supplements the insufficient heat. The reason for supplementing is that the first-stage preheater 10 and the second-stage preheater 9 are arranged, and after double preheating, the gas temperature transported to the SCR reactor 12 and the dryer 13 will be lower than that when only one preheater is arranged, so the dryer station 24 needs to supplement the heat.

[0061] Step seven: control the drying machine station 24 combustion capacity, ensure that the induced draft fan 19 exhaust gas temperature 120~130℃.

[0062] The principle and implementation mode of the utility model are described by applying specific examples in the utility model, and the above embodiment is only used for helping to understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, there will be changes in the specific implementation mode and application range. In conclusion, the content of the specification should not be understood as the limitation of the utility model.

Claims

1. An energy-saving suspension calcining device for aluminum hydroxide, characterized by: The cooling assembly, the preheating assembly, the suspension roaster, the SCR reactor, the dryer, the feeding assembly, the waste gas discharge assembly and the heat supply device; The cooling assembly comprises a four-stage cyclone cooler, a three-stage cyclone cooler, a two-stage cyclone cooler and a one-stage cyclone cooler, the inlet of the four-stage cyclone cooler is connected with the outside atmosphere, the gas outlet of the four-stage cyclone cooler is connected with the inlet of the three-stage cyclone cooler, the gas outlet of the three-stage cyclone cooler is connected with the inlet of the two-stage cyclone cooler, the gas outlet of the two-stage cyclone cooler is connected with the inlet of the one-stage cyclone cooler, the gas outlet of the one-stage cyclone cooler is connected with the inlet of the suspension roaster, the discharge outlet of the one-stage cyclone cooler is connected with the inlet of the two-stage cyclone cooler, the discharge outlet of the two-stage cyclone cooler is connected with the inlet of the three-stage cyclone cooler, and the discharge outlet of the three-stage cyclone cooler is connected with the inlet of the four-stage cyclone cooler. The preheating assembly comprises a three-stage preheater, a two-stage preheater, a one-stage preheater and a first-stage preheater, the gas outlet of the suspension roaster is connected with the inlet of the three-stage preheater, the gas outlet of the three-stage preheater is connected with the inlet of the two-stage preheater, the gas outlet of the two-stage preheater is connected with the inlet of the one-stage preheater, the gas outlet of the one-stage preheater is connected with the inlet of the SCR reactor, the gas outlet of the SCR reactor is connected with the inlet of the dryer, the outlet of the dryer is connected with the inlet of the first-stage preheater, the gas outlet of the first-stage preheater is connected with the waste gas discharge assembly, the discharge outlet of the first-stage preheater is connected with the inlet of the one-stage preheater, the discharge outlet of the one-stage preheater is connected with the inlet of the two-stage preheater, the discharge outlet of the two-stage preheater is connected with the inlet of the suspension roaster, and the discharge outlet of the suspension roaster is connected with the inlet of the three-stage preheater. The heat supply device can supply heat for the SCR reactor.

2. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The cooling assembly further comprises an indirect cooler, and the discharge outlet of the four-stage cyclone cooler is connected with the inlet of the indirect cooler.

3. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The waste gas discharge assembly comprises a dust collector, an induced draft fan and a chimney, the inlet of the dust collector is connected with the gas outlet of the first-stage preheater, the gas outlet of the dust collector is connected with the chimney, and the induced draft fan is arranged on the pipeline between the dust collector and the chimney.

4. The energy-saving aluminum hydroxide suspension calcining device according to claim 3, characterized in that: The dust outlet end of the dust collector is provided with a dust returning device, and the dust outlet of the dust returning device is connected with the inlet of the one-stage cyclone cooler.

5. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The feeding assembly comprises a raw material bin, a metering scale and a feeder, the metering scale is arranged below the discharge outlet of the raw material bin, the output end of the metering scale is connected with the feeding end of the feeder, and the discharge end of the feeder is connected with the inlet of the dryer.

6. The energy-saving aluminum hydroxide suspension calcining device according to claim 5, characterized in that: The discharge outlet of the feeder is connected with the dryer through two parallel feeding conveying pipelines. The discharge port of the first-stage preheater is provided with two first-stage material conveying pipelines, and the ends of the two first-stage material conveying pipelines away from the first-stage preheater are connected to the inlet of the first-stage preheater in communication. The discharge port of the second-stage preheater is provided with two second-stage material conveying pipelines, and the ends of the two second-stage material conveying pipelines away from the second-stage preheater are connected to the feed inlet of the suspension roaster in communication.

7. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The first-stage preheater is provided with two.

8. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The discharge port of the third-stage preheater is further provided with a residence tank between the discharge port and the inlet of the first-stage cyclone cooler.

9. The energy-saving aluminum hydroxide suspension calcining device according to claim 1, characterized in that: The heat supply device is a drying machine station. The outer wall of the third-stage cyclone cooler is provided with a cooling jacket, and the gas outlet of the cooling jacket is connected to the drying machine station through a pipeline.

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