CN216205539U

CN216205539U - Multistage evaporation plant for extracting alkali from red mud

Info

Publication number: CN216205539U
Application number: CN202122683319.7U
Authority: CN
Inventors: 高清平; 陶予敏; 王海新; 张玺; 商睿; 王浩; 赵延祥
Original assignee: Luoyang Junjiang Building Material Technology Co ltd; Luoyang Highway Development Center
Current assignee: Luoyang Junjiang Building Material Technology Co ltd; Luoyang Highway Development Center
Priority date: 2021-11-04
Filing date: 2021-11-04
Publication date: 2022-04-05
Anticipated expiration: 2031-11-04

Abstract

A multi-stage evaporation device for extracting alkali from red mud relates to the field of red mud harmless treatment equipment, and comprises a high-temperature steam inlet pipe, a low-temperature steam outlet pipe and a plurality of evaporators; the interiors of the plurality of evaporators are divided into an upper temperature area, a middle heating area and a lower temperature area, a heat insulating pipe and a plurality of heat exchange pipes are arranged in the middle heating area, the heat insulating pipe and the plurality of heat exchange pipes can be communicated with the corresponding upper temperature area and the corresponding lower temperature area, two opposite side walls of the upper temperature area are respectively provided with an alkali liquor inlet and an alkali liquor outlet, and the top wall of the upper temperature area is provided with a separated steam outlet; the high-temperature steam inlet pipe is respectively and correspondingly communicated with the plurality of middle heating areas, and the low-temperature steam outlet pipe is respectively and correspondingly communicated with the plurality of middle heating areas; the alkali liquor inlet of the evaporator at the next stage is communicated with the alkali liquor outlet of the evaporator at the previous stage, and the separated steam outlet of the evaporator at the next stage is communicated with the top wall of the upper temperature zone of the evaporator at the previous stage; the multistage evaporation device not only reduces the concentrated alkali brought out by steam, but also improves the concentration efficiency and reduces the noise.

Description

Multistage evaporation plant for extracting alkali from red mud

Technical Field

The utility model relates to the field of red mud harmless treatment equipment, in particular to a multistage evaporation device for extracting alkali from red mud.

Background

The red mud is an industrial solid waste discharged in large quantity when alumina is extracted by an alumina plant, and the red mud treatment promotes an important subject to be urgently solved by industrial green development in the fourteen-five period; washing and filter-pressing the red mud to obtain alkali liquor containing a certain content of sodium carbonate, and before further alkali extraction, evaporating and concentrating the alkali liquor by using a multi-stage evaporator; in the subsequent stage of evaporation process of the traditional evaporator, high-concentration alkaline water vapor is often generated, the alkaline water vapor can cause great damage to equipment if being condensed after being directly utilized by secondary heat exchange, and white slag can be formed on the equipment, the outer wall of a pipeline and the top of a factory building after the vapor is normally leaked, so that the cleaning cost is increased; in addition, as the alkali liquor of the existing evaporator enters from bottom to top, the concentration efficiency is low, steam bubbling is easy to occur, noise is generated, and high-concentration liquid drops are taken away.

Disclosure of Invention

In order to overcome the defects in the background art, the utility model discloses a multistage evaporation device for extracting alkali from red mud, which not only reduces concentrated alkali brought out by steam, but also improves the concentration efficiency and reduces the noise.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a multistage evaporation device for extracting alkali from red mud comprises a high-temperature steam inlet pipe, a low-temperature steam outlet pipe and a plurality of evaporators arranged in parallel front and back; the interior of each evaporator is divided into an upper temperature area, a middle heating area and a lower temperature area by an upper partition plate and a lower partition plate, a heat insulation pipe and a plurality of heat exchange pipes distributed around the heat insulation pipe are arranged in the middle heating area, the heat insulation pipe and the heat exchange pipes can be communicated with the corresponding upper temperature area and the lower temperature area, two opposite side walls of the upper temperature area are respectively provided with an alkali liquor inlet and an alkali liquor outlet, and the top wall of the upper temperature area is provided with a separation steam outlet; the high-temperature steam inlet pipes are respectively and correspondingly communicated with the upper ends of the middle heating areas of the plurality of evaporators, and the low-temperature steam outlet pipes are respectively and correspondingly communicated with the lower ends of the middle heating areas of the plurality of evaporators; the evaporator alkali liquor inlet of the next stage is correspondingly communicated with the evaporator alkali liquor outlet of the previous stage through a transition pipe, and the evaporator separation steam outlet of the next stage is correspondingly communicated with the top wall of the upper temperature zone of the evaporator of the previous stage through a steam mixing pipe.

Furthermore, a blow-off pipe is arranged at the lower temperature area of the evaporator, and a blow-off valve is installed on the blow-off pipe.

Furthermore, the connecting position of the steam mixing pipe and the corresponding upper temperature area is far away from the alkali liquor inlet of the evaporator.

Further, the heat insulation pipe is close to the alkali liquor inlet of the evaporator.

Furthermore, the alkali liquor outlet of the last evaporator is connected with a concentrated alkali liquor outlet pipe, and an opening degree adjusting valve is installed on the concentrated alkali liquor outlet pipe.

Further, the number of the evaporators is two.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

the multistage evaporation device for extracting the alkali from the red mud disclosed by the utility model carries out evaporation concentration through the multistage evaporator, the alkali liquor of each stage of evaporator is designed to be fed upwards and discharged upwards, and the central heat-insulating pipe is used for isolating direct heating of the liquid in the central heat-insulating pipe by using steam, so that the liquid in the central heat-insulating pipe and the surrounding heat exchange pipes forms a temperature difference and naturally flows in the evaporator, the heat exchange efficiency is increased, the concentration effect is improved, and the bubbling of the steam can be inhibited by using the alkali liquor entering an upper temperature zone, so that the noise is reduced; meanwhile, the upper temperature area space of the evaporator is utilized to improve and mix the steam from the next-stage evaporator and the steam self, so that the content of alkali in the steam is reduced overall, the environment pollution after normal leakage is prevented, and the condensate water is conveniently formed and then directly recycled.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

fig. 2 is a schematic view of the structure of the evaporator.

In the figure: 1. an evaporator; 101. an upper temperature zone; 102. a middle warming zone; 103. a lower temperature zone; 104. an upper partition plate; 105. a heat-insulating pipe; 106. a heat exchange pipe; 107. a lower partition plate; 108. an alkali liquor outlet; 109. an alkali liquor inlet; 1010. a separation steam outlet; 2. a transition duct; 3. a steam mixing pipe; 4. a concentrated alkali liquor outlet pipe; 5. an opening degree regulating valve; 6. a blow-off pipe; 7. a blowoff valve; 8. a low-temperature steam outlet pipe; 9. and (4) introducing high-temperature steam into the pipe.

Detailed Description

In the following description, the technical solutions of the present invention will be described with reference to the drawings of the embodiments of the present invention, and it should be understood that, if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "left", "right", etc., it is only corresponding to the drawings of the present invention, and for convenience of describing the present invention, it is not necessary to indicate or imply that the indicated devices or elements have a specific orientation:

the multi-stage evaporation device for red mud alkali extraction, which is described with reference to fig. 1-2, comprises a high-temperature steam inlet pipe 9, a low-temperature steam outlet pipe 8 and a plurality of evaporators 1 arranged in parallel in the front and at the back, wherein two evaporators 1 are arranged as required, namely, two-stage evaporation in the front and at the back; the interiors of a plurality of evaporators 1 are divided into an upper temperature area 101, a middle temperature-raising area 102 and a lower temperature area 103 by upper clapboards 104 and lower clapboards 107, a heat-insulating pipe 105 and a plurality of heat exchange pipes 106 distributed around the heat-insulating pipe 105 are arranged in the middle temperature-raising area 102, the heat-insulating pipe 105 and the heat exchange pipes 106 can be communicated with the corresponding upper temperature area 101 and the lower temperature area 103, namely, a plurality of corresponding jacks are arranged on the surfaces of the upper clapboard 104 and the lower clapboard 107, the end parts of the heat-insulating pipe 105 and the heat exchange pipes 106 are correspondingly disassembled into the corresponding jacks and are sealed and fixed with the inner walls of the jacks, so that the stable connection is ensured, the direct heating of the liquid in the heat-insulating pipe 105 by steam is isolated by the heat-insulating pipe 105 by utilizing the fluid motion principle that the liquid in the heat-insulating pipe 105 and the liquid in the surrounding heat exchange pipes 106 form a temperature difference and then move downwards, and the natural circulation of alkali liquor is ensured, the heat exchange efficiency is increased, and the concentration effect is improved;

the two opposite side walls of the upper temperature area 101 are respectively provided with an alkali liquor inlet 109 and an alkali liquor outlet 108, the distance between the alkali liquor inlet 109 and the alkali liquor outlet 108 is increased so as to prevent alkali liquor from directly flowing out after entering the upper temperature area, and when the alkali liquor enters the upper temperature area 101, the alkali liquor contacts with high-temperature alkali liquor in the upper temperature area, so that the bubbling can be inhibited; as required, the heat-insulating pipe 105 is close to the alkali liquor inlet 109 of the evaporator 1, so that the entering alkali liquor can flow to the heat-insulating pipe 105 conveniently; the top wall of the upper temperature zone 101 is provided with a separated steam outlet 1010 for separating and guiding out steam; the high-temperature steam inlet pipe 9 is respectively and correspondingly communicated with the upper ends of the middle heating areas 102 of the plurality of evaporators 1, the low-temperature steam outlet pipe 8 is respectively and correspondingly communicated with the lower ends of the middle heating areas 102 of the plurality of evaporators 1, and the heat exchange pipe 106 is heated and heated by introducing steam into the middle heating areas 102; according to requirements, a blow-off pipe 6 is arranged at the lower temperature area 103 of the evaporator 1, and a blow-off valve 7 is arranged on the blow-off pipe 6 and is used for cleaning and blow-off;

the alkali liquor inlet 109 of the evaporator 1 at the next stage is correspondingly communicated with the alkali liquor outlet 108 of the evaporator 1 at the previous stage through a transition pipe 2; according to the requirement, the alkali liquor outlet 108 of the last stage evaporator 1 is connected with a concentrated alkali liquor outlet pipe 4, an opening degree adjusting valve 5 is installed on the concentrated alkali liquor outlet pipe 4, the outlet liquor flow of the concentrated alkali liquor is adjusted by controlling the opening degree of the opening degree adjusting valve 5, the smaller the opening degree of the opening degree adjusting valve 5 is, the longer the evaporation and concentration time of the alkali liquor in the evaporator is, and the better the concentration effect is; the separated steam outlet 1010 of the evaporator 1 at the next stage is correspondingly communicated with the top wall of the upper temperature area 101 of the evaporator 1 at the previous stage through the steam mixing pipe 3, and the space of the upper temperature area 101 of the evaporator 1 is utilized to improve and mix the steam from the evaporator 1 at the next stage and the steam per se, so that the content of alkali in the steam is reduced, the environment pollution after normal leakage is prevented, and the direct recycling after the condensed water is formed is facilitated; according to requirements, the connecting position of the steam mixing pipe 3 and the corresponding upper temperature zone 101 is far away from the alkali liquor inlet 109 of the evaporator 1, the steam bubbling of one part of the upper temperature zone 101 can be inhibited through the alkali liquor entering from the alkali liquor inlet 109, and the steam bubbling of the other part of the upper temperature zone 101 can be inhibited through the steam entering from the steam mixing pipe 3.

The utility model is not described in detail in the prior art, and it is apparent to a person skilled in the art that the utility model is not limited to details of the above-described exemplary embodiments, but that the utility model can be embodied in other specific forms without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the scope of the claims concerned.

Claims

1. A multistage evaporation plant for extracting alkali from red mud is characterized in that: comprises a high-temperature steam inlet pipe (9), a low-temperature steam outlet pipe (8) and a plurality of evaporators (1) which are arranged in parallel front and back; the interior of each evaporator (1) is divided into an upper temperature area (101), a middle temperature-raising area (102) and a lower temperature area (103) by an upper partition plate (104) and a lower partition plate (107), a heat-insulating pipe (105) and a plurality of heat exchange pipes (106) distributed around the heat-insulating pipe (105) are arranged in the middle temperature-raising area (102), the heat-insulating pipe (105) and the heat exchange pipes (106) can be communicated with the corresponding upper temperature area (101) and the lower temperature area (103), two opposite side walls of the upper temperature area (101) are respectively provided with an alkali liquor inlet (109) and an alkali liquor outlet (108), and the top wall of the upper temperature area (101) is provided with a separation steam outlet (1010); the high-temperature steam inlet pipe (9) is correspondingly communicated with the upper ends of the middle heating areas (102) of the plurality of evaporators (1), and the low-temperature steam outlet pipe (8) is correspondingly communicated with the lower ends of the middle heating areas (102) of the plurality of evaporators (1); the alkali liquor inlet (109) of the evaporator (1) of the next stage is correspondingly communicated with the alkali liquor outlet (108) of the evaporator (1) of the previous stage through the transition pipe (2), and the separated steam outlet (1010) of the evaporator (1) of the next stage is correspondingly communicated with the top wall of the upper temperature area (101) of the evaporator (1) of the previous stage through the steam mixing pipe (3).

2. The multistage evaporation device for extracting alkali from red mud of claim 1, which is characterized in that: a blow-off pipe (6) is arranged at a lower temperature area (103) of the evaporator (1), and a blow-off valve (7) is installed on the blow-off pipe (6).

3. The multistage evaporation device for extracting alkali from red mud of claim 1, which is characterized in that: the connecting position of the steam mixing pipe (3) and the corresponding upper temperature zone (101) is far away from an alkali liquor inlet (109) of the evaporator (1).

4. The multistage evaporation device for extracting alkali from red mud of claim 1, which is characterized in that: the heat insulation pipe (105) is close to the alkali liquor inlet (109) of the evaporator (1).

5. The multistage evaporation device for extracting alkali from red mud of claim 1, which is characterized in that: the alkali liquor outlet (108) of the last evaporator (1) is connected with a concentrated alkali liquor outlet pipe (4), and an opening degree adjusting valve (5) is installed on the concentrated alkali liquor outlet pipe (4).

6. The multistage evaporation device for extracting alkali from red mud of claim 1, which is characterized in that: the number of the evaporators (1) is two.