System for eliminating fresh steam used by aluminum oxide production hot water tank
By introducing high-temperature condensate from the final-effect forced evaporator and exhaust gas from the thermoelectric deaerator into alumina production, the problem of insufficient utilization of waste heat from high-temperature condensate was solved, achieving temperature increase and energy saving in the hot water tank, eliminating noise pollution, and meeting the needs of washing water.
Patent Information
- Application Number
- CN202422516309.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-17
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-10-17
AI Technical Summary
In the alumina production process, the waste heat of the high-temperature condensate generated by the final-effect forced evaporator is not maximized, resulting in the waste of new steam consumption and noise pollution. In addition, the temperature of the hot water tank is insufficient, which affects product quality and energy consumption.
The high-temperature condensate from the final-effect forced evaporator and the exhaust gas from the thermoelectric deaerator are introduced into the hot water tank through a pipeline system, located 3 meters and 3.5 meters below the liquid surface, respectively. Combined with the main pipe, coil and branch pipe structure, the high-temperature condensate and water are effectively mixed and heated, eliminating noise pollution.
It achieved a 7.8℃ increase in hot water tank temperature, saved 3t/h of new steam, reduced energy consumption, eliminated noise pollution, met washing water needs, and improved the mixing efficiency of water in the hot water tank.
Smart Images
Figure CN223470521U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of alumina production, especially relates to a system for eliminating new steam used in hot water tank of alumina production. BACKGROUND
[0002] In the process of alumina production, the filter cake after filtering of aluminum hydroxide needs hot water washing to reduce the attached alkali of the filter cake, the low-temperature hot water washing effect is poor, causes the attached alkali to rise, influences product quality and alkali loss, the hot water quantity of alumina production is limited, cannot fully meet the process demand of each part, causes the temperature of hot water tank to be low and the filter cake of aluminum hydroxide filtration to contain high alkali, the commonly used washing water temperature raising method is all to increase the heat exchanger and heat, but its process is complex and the heat exchanger cleaning and overhauling is difficult and high in cost, the most direct method is to heat using new steam, causes the waste of new steam consumption. Figure 2 As shown in the figure, I, II, III, IV: evaporator;1, 2, 3, 4, 5: condensate from the evaporating tank;①, ②, ③, ④: direct preheater;Z1, Z2: from the evaporator) in order to save energy, new steam heating is all carried out Ⅰ effect or extended to Ⅱ effect heating, the generated steam and high-temperature condensate from the evaporator are recovered to heat the next stage, due to the multiple recovery of steam heating, the condensate temperature (116 ℃) is relatively low, and the self-evaporation capacity of the condensate evaporating tank is limited, after mixing, the high-temperature condensate from the evaporator enters the 5-effect condensate evaporating tank for self-evaporation, and the amount of steam generated is also relatively small, causing the waste heat of the high-temperature condensate from the evaporator to be unable to be maximized. UTILITY MODEL CONTENTS
[0003] Therefore, the utility model aims at providing a system for eliminating new steam used in hot water tank of alumina production to at least solve the technical problem that the waste heat of high-temperature condensate from the evaporator cannot be maximized.
[0004] The utility model aims at realizing the following technical scheme:
[0005] A system for eliminating new steam used in hot water tank of alumina production, which comprises a pipeline system, one end of the pipeline system is connected with a high-temperature condensate outlet of a last-effect forced evaporator, the other end is located at least 3 meters below the liquid level of a hot water tank, the last-effect forced evaporator is a last-effect forced evaporator of two groups of multi-effect evaporators, and the hot water tank is a washing water heating tank for filter cake of aluminum hydroxide.
[0006] Further, it also comprises a second pipeline, one end of which is connected to the exhaust outlet of the thermoelectric deaerator, and the other end is located at least 3.5 meters below the liquid level of the hot water tank.
[0007] Further, the pipeline system comprises a main pipe, a coil pipe and a plurality of branch pipes, the main pipe is connected to the coil pipe, the coil pipe is horizontally located above the liquid level of the hot water tank, the coil pipe is connected to the plurality of branch pipes at uniform intervals, the main pipe is connected to the high-temperature condensed water outlet of the last-effect forced evaporator, and the plurality of branch pipes are located at least 3 meters below the liquid level of the hot water tank and are staggered in height.
[0008] The beneficial effects of the utility model are as follows:
[0009] The system for eliminating the use of new steam of the hot water tank in the production of aluminum oxide provided by the utility model introduces the 116 DEG C high-temperature condensed water of the last-effect forced evaporator into the hot water tank through the pipeline system, can heat the water in the hot water tank to 92.3 DEG C, and still has a flow of 190 m3 / h, meets the washing water demand of the filter cake of aluminum hydroxide filtration and other demands, and does not need to introduce new steam into the hot water tank for heating, so that 3 t of new steam is saved per hour.
[0010] Compared with the traditional method of introducing the high-temperature condensed water of the last-effect forced evaporator into the V-effect condensed water self-evaporation tank to mix with the low-temperature condensed water, and using the condensed water self-evaporation tank to generate steam for recycling, according to the self-evaporation efficiency of the condensed water self-evaporation tank, the steam generated by the high-temperature condensed water of the last-effect forced evaporator can be ignored, and the amount of steam offset by the new steam of the evaporation system is far less than the 3 t / h of new steam saved by being introduced into the hot water tank, so that the waste heat of the high-temperature condensed water of the last-effect forced evaporator is maximized, and the effect of obvious energy saving and consumption reduction is achieved.
[0011] The high-temperature condensed water of the last-effect forced evaporator no longer enters the V-effect condensed water self-evaporation tank for self-evaporation, and has no obvious influence on the operation and energy saving of the evaporation system.
[0012] The exhaust gas of the thermoelectric deaerator 3 is accompanied by steam, and the exhaust gas of the thermoelectric deaerator 3 is introduced into the hot water tank through the second pipeline, so that the temperature of the water in the hot water tank can be further improved, and the noise pollution caused by emptying is eliminated.
[0013] The high-temperature condensed water is introduced into the liquid level of the hot water tank through the plurality of branch pipes, so that the mixing efficiency of the condensed water and the water in the hot water tank can be improved.
[0014] The other advantages, objects and features of the utility model will be described in the subsequent specification to some extent, and to some extent, it will be obvious to those skilled in the art based on the study of the following text or can be taught from the practice of the utility model. The objects and other advantages of the utility model can be realized and obtained by the following specification. BRIEF DESCRIPTION OF DRAWINGS
[0015] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings, in which:
[0016] Figure 1 This is a schematic structural diagram of the utility model.
[0017] Figure 2 Schematic diagram of high-temperature condensed water utilization in the existing final-effect forced evaporator 1.
[0018] In the figure: final effect forced evaporator 1, hot water tank 2, thermoelectric deaerator 3, first pipeline 4. DETAILED DESCRIPTION
[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention and are not intended to limit the scope of protection of the present invention.
[0020] Example 1
[0021] like Figure 1 As shown, a system for eliminating the use of new steam in the hot water tank for alumina production comprises two first pipes 4, one end of the two first pipes 4 being respectively connected to the high-temperature condensate outlets of the two final-effect forced evaporators 1, and the other end being located at least 3 meters below the liquid surface of the hot water tank 2 and spaced apart (the depth of the hot water tank 2 is 10 meters). The high-temperature condensate discharged from the high-temperature condensate outlets of the two final-effect forced evaporators 1 has a water temperature of 116°C, the two final-effect forced evaporators 1 being respectively the final-effect forced evaporators of two groups of four-effect evaporators, and the hot water tank 2 being a washing water heating tank for filtering the filter cake of aluminum hydroxide.
[0022] The comparison of relevant data before and after the application of this embodiment is shown in Table 1:
[0023] Table 1
[0024]
[0025] From the table above, we can see that the high-temperature condensate water from the last-effect forced evaporator 1 of the two groups of four-effect evaporators is introduced into the hot water tank 2 for mixing and temperature increase, which has no obvious impact on the operation and energy saving of the evaporation system. The temperature of the water in the hot water tank 2 is increased by 7.8℃, eliminating the waste of 3t of new steam used in the hot water tank 2 per hour.
[0026] Example 2
[0027] like Figure 1 As shown, the difference from the first embodiment is that it further includes a second pipe, one end of which is connected to the exhaust gas outlet of the thermoelectric deaerator 3 and the other end is located at least 3.5 meters below the liquid level of the hot water tank 2.
[0028] The exhaust gas discharged by the thermoelectric deaerator 3 is accompanied by steam, and the exhaust gas discharged by the thermoelectric deaerator 3 is introduced into the hot water tank through the second pipeline, so as to further improve the water temperature of the water in the hot water tank and eliminate the noise pollution caused by the exhaust.
[0029] Embodiment three
[0030] The difference from the embodiment one is that it comprises a main pipe, a coil pipe and a plurality of branch pipes, the main pipe is connected with the coil pipe, the coil pipe is horizontally located above the liquid level of the hot water tank, the coil pipe is connected with the plurality of branch pipes at uniform intervals, the main pipe is connected with the high-temperature condensed water discharge outlet of the last-effect forced evaporator 1, and the plurality of branch pipes are located at least 3 meters below the liquid level of the hot water tank 2 and staggered in height.
[0031] The high-temperature condensed water is introduced into the hot water tank below the liquid level through the plurality of branch pipes, so as to improve the mixing efficiency of the condensed water and the water in the hot water tank.
[0032] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the present application, and all should be covered in the scope of the claims of the present application.
Claims
1. A system for eliminating the use of live steam in the hot water tank of an alumina production plant, characterized in that it comprises: It comprises a pipeline system, one end of which is connected to the high-temperature condensed water outlet of the last-effect forced evaporator (1), the other end of which is located at least 3 meters below the liquid level of the hot water tank (2), the last-effect forced evaporator (1) is the last-effect forced evaporator of two groups of multi-effect evaporators, and the hot water tank (2) is a hot water tank for washing the filter cake of aluminum hydroxide filtration.
2. The system for eliminating the use of live steam in the hot water tank of an alumina production plant according to claim 1, characterized in that it comprises: It also comprises a second pipeline, one end of which is connected to the exhaust gas outlet of the thermoelectric oxygen remover (3), and the other end of which is located at least 3.5 meters below the liquid level of the hot water tank (2).
3. The system for eliminating the use of live steam in an alumina production hot water tank according to claim 1, characterized by the fact that it comprises: The pipeline system comprises a main pipe, a coil pipe and a plurality of branch pipes, the main pipe is connected to the coil pipe, the coil pipe is horizontally located above the liquid level of the hot water tank, the coil pipe is connected to the plurality of branch pipes at uniform intervals, the main pipe is connected to the high-temperature condensed water outlet of the last-effect forced evaporator (1), and the plurality of branch pipes are located at least 3 meters below the liquid level of the hot water tank (2) and are staggered in height.