CN219103737U - Hematite tail gas waste heat recovery system - Google Patents
Hematite tail gas waste heat recovery system Download PDFInfo
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- CN219103737U CN219103737U CN202223542387.2U CN202223542387U CN219103737U CN 219103737 U CN219103737 U CN 219103737U CN 202223542387 U CN202223542387 U CN 202223542387U CN 219103737 U CN219103737 U CN 219103737U
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Abstract
The utility model discloses a hematite tail gas waste heat recovery system. The system comprises: the device comprises a tail gas washing unit, a wet zinc metallurgy unit and a heat exchange device. The tail gas washing unit comprises a cooling water inlet, a hematite iron-removing tail gas inlet and a washing wastewater outlet; the wet zinc smelting unit comprises an electrolytic zinc subunit and a zinc-iron separation subunit, wherein the electrolytic zinc subunit comprises a waste electrolyte outlet, the zinc-iron separation subunit comprises a hematite iron-removing tail gas outlet, and the hematite iron-removing tail gas outlet is connected with a hematite iron-removing tail gas inlet; the heat exchange device comprises a washing wastewater inlet, a waste electrolyte inlet, a washing wastewater outlet after heat exchange and a waste electrolyte outlet after heat exchange, wherein the washing wastewater inlet is connected with the washing wastewater outlet, and the waste electrolyte inlet is connected with the waste electrolyte outlet. By adopting the system, the utilization rate of the waste heat of the hematite tail gas is improved, the production cost is reduced, the iron removal stability is enhanced, the quality of the hematite slag product is improved, and the recovery rate of valuable metals is also improved.
Description
Technical Field
The utility model belongs to the field of chemical industry, and particularly relates to a hematite tail gas waste heat recovery system.
Background
In recent years, with the successful application of various iron removal processes, a wet zinc smelting process is rapidly developed, wherein the iron removal process of hematite has the advantages of high iron recovery rate, no need of additives for iron removal, good comprehensive utilization of iron and the like, and cannot be replaced by other processes. The iron removal of the hematite is realized by converting ferrous ions into hematite sediment with stable forms under the conditions of high temperature and high pressure. The flash evaporation tail gas discharged in the operation process of the hematite iron removal system can carry part of acid liquor and a small amount of hematite slag, the tail gas can be discharged into the atmosphere after washing, the washed tail gas washing liquid has higher heat energy, and at present, the part of heat energy is not effectively utilized.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems in the related art to some extent. To this end, an object of the present utility model is to propose a hematite tail gas waste heat recovery system. The system can recycle the waste heat in the hematite iron removal tail gas washing wastewater, is used for improving the temperature of the waste electrolyte, reduces the steam consumption in the subsequent working procedure, is beneficial to improving the energy utilization rate and reducing the production cost, is beneficial to avoiding or reducing the expansion of the system volume caused by the entering of steam and steam condensate into the hematite iron removal system, and is further beneficial to enhancing the iron removal stability, improving the quality of the hematite slag product and improving the recovery rate of valuable metals.
In one aspect of the utility model, the utility model provides a hematite tail gas waste heat recovery system. According to an embodiment of the utility model, the system comprises:
the tail gas washing unit comprises a cooling water inlet, a hematite iron removal tail gas inlet and a washing wastewater outlet;
the zinc hydrometallurgy unit comprises an electrolytic zinc subunit and a zinc-iron separation subunit, wherein the electrolytic zinc subunit comprises a waste electrolyte outlet, the zinc-iron separation subunit comprises a hematite iron removal tail gas outlet, and the hematite iron removal tail gas outlet is connected with the hematite iron removal tail gas inlet;
the heat exchange device comprises a washing wastewater inlet, a waste electrolyte inlet, a washing wastewater outlet after heat exchange and a waste electrolyte outlet after heat exchange, wherein the washing wastewater inlet is connected with the washing wastewater outlet, and the waste electrolyte inlet is connected with the waste electrolyte outlet.
According to the hematite tail gas waste heat recovery system disclosed by the embodiment of the utility model, the heat energy of the tail gas washing wastewater can be recovered and reused by introducing the tail gas washing wastewater and the waste electrolyte into the heat exchange device for heat exchange treatment, namely, the waste electrolyte can be warmed up by using the heat energy of the washing wastewater, so that the heat energy or the steam consumption required by the subsequent treatment (such as working procedures of hot acid reduction of zinc ore leaching residues) by using the waste electrolyte is reduced, on one hand, the resource utilization rate can be effectively improved, the production cost can be reduced, and the treatment efficiency and the effect of the subsequent treatment by using the waste electrolyte can be improved; on the other hand, the temperature of the waste electrolyte is raised, the production stability of zinc-iron separation is improved, and the problem that when the waste electrolyte is used in a zinc-iron separation subunit or upstream of the zinc-iron separation subunit (such as hot acid reduced zinc ore leaching slag), excessive steam enters the zinc-iron separation subunit and the volume of the part of the system is expanded due to more heat energy required when the obtained deironing liquid is heated by steam can be avoided or reduced; further, after the steam entering the zinc-iron separation subunit is reduced, the condensed water entering the zinc-iron separation subunit is also reduced, so that the consumption of the hematite slag washing water can be increased under the condition of ensuring that the volume of the subunit is fixed, and the product quality of the hematite slag and the recovery rate of valuable metals can be improved.
In addition, the hematite tail gas waste heat recovery system according to the above embodiment of the present utility model may further have the following additional technical features:
optionally, the tail gas scrubbing unit comprises: the device comprises an exhaust condenser, a Venturi scrubber and a separator, wherein the exhaust condenser comprises an iron-removing tail gas inlet of hematite, the Venturi scrubber comprises a cooling water inlet, and the separator comprises a washing wastewater outlet.
Optionally, the tail gas scrubbing unit further comprises: the tail gas washing wastewater storage tank, the inlet end of the tail gas washing wastewater storage tank is connected with the washing wastewater outlet, and the outlet end of the tail gas washing wastewater storage tank is connected with the washing wastewater inlet through the first conveying pump.
Optionally, the tail gas scrubbing unit further comprises: and the inlet end of the cooling tower is connected with the washing wastewater outlet after heat exchange, and the outlet end of the cooling tower is connected with the cooling water inlet.
Optionally, the cooling tower is a recirculating cooling tower.
Optionally, the tail gas scrubbing unit further comprises: the cooling water storage tank comprises a cooling water storage area and a water storage area to be cooled, which are arranged in a separated mode, wherein the inlet end of the water storage area to be cooled is connected with the washing wastewater outlet after heat exchange, and the outlet end of the water storage area to be cooled is connected with the inlet end of the cooling tower; the inlet end of the cooling water storage area is connected with the outlet end of the cooling tower, and the outlet end of the cooling water storage area is connected with the cooling water inlet.
Optionally, a circulation pump is arranged between the outlet end of the water storage area to be cooled and the inlet end of the cooling tower.
Optionally, a second transfer pump is provided between the outlet end of the cooling water reservoir and the cooling water inlet.
Optionally, the zinc hydrometallurgy unit further comprises: the device comprises a first waste electrolyte storage tank and a second waste electrolyte storage tank, wherein the inlet end of the first waste electrolyte storage tank is connected with the waste electrolyte outlet, the outlet end of the first waste electrolyte storage tank is connected with the waste electrolyte inlet through a third conveying pump, and the waste electrolyte outlet after heat exchange is connected with the inlet end of the second waste electrolyte storage tank.
Optionally, the second spent electrolyte storage tank is provided with a temperature measuring device.
Optionally, the heat exchange device comprises a spiral plate heat exchanger.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a hematite tail gas waste heat recovery system according to one embodiment of the present utility model;
FIG. 2 is a schematic diagram of a hematite tail gas waste heat recovery system according to yet another embodiment of the present utility model;
fig. 3 is a schematic view of a hematite tail gas waste heat recovery system according to still another embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model. In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In the present utility model, unless explicitly specified and limited otherwise, terms such as "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly attached, detachably attached, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In one aspect of the utility model, the utility model provides a hematite tail gas waste heat recovery system. As understood in connection with fig. 1, the system includes, in accordance with an embodiment of the present utility model: the device comprises a tail gas washing unit 100, a zinc hydrometallurgy unit 200 and a heat exchange device 300, wherein the tail gas washing unit 100 comprises a cooling water inlet 101, a hematite iron removal tail gas inlet 102 and a washing wastewater outlet 103; the zinc hydrometallurgy unit 200 comprises a waste electrolyte outlet 201 and a hematite iron removal tail gas outlet 202, wherein the hematite iron removal tail gas outlet 202 is connected with the hematite iron removal tail gas inlet 102; the heat exchange device 300 comprises a washing wastewater inlet 301, a waste electrolyte inlet 302, a washing wastewater outlet 303 after heat exchange and a waste electrolyte outlet 304 after heat exchange, wherein the washing wastewater inlet 301 is connected with the washing wastewater outlet 103, and the waste electrolyte inlet 302 is connected with the waste electrolyte outlet 201.
According to the hematite tail gas waste heat recovery system disclosed by the embodiment of the utility model, the heat energy of the tail gas washing wastewater can be recovered and reused by introducing the tail gas washing wastewater and the waste electrolyte into the heat exchange device for heat exchange treatment, namely, the waste electrolyte can be warmed up by using the heat energy of the washing wastewater, so that the heat energy or the steam consumption required by the subsequent treatment (such as working procedures of hot acid reduction of zinc ore leaching residues) by using the waste electrolyte is reduced, on one hand, the resource utilization rate can be effectively improved, the production cost can be reduced, and the treatment efficiency and the effect of the subsequent treatment by using the waste electrolyte can be improved; on the other hand, the temperature of the waste electrolyte is raised, the production stability of zinc-iron separation is improved, and the problem that when the waste electrolyte is used in a zinc-iron separation subunit or upstream of the zinc-iron separation subunit (such as hot acid reduced zinc ore leaching slag), excessive steam enters the zinc-iron separation subunit and the volume of the part of the system is expanded due to more heat energy required when the obtained deironing liquid is heated by steam can be avoided or reduced; further, after the steam entering the zinc-iron separation subunit is reduced, the condensed water entering the zinc-iron separation subunit is also reduced, so that the consumption of the hematite slag washing water can be increased under the condition of ensuring that the volume of the subunit is fixed, and the product quality of the hematite slag and the recovery rate of valuable metals can be improved.
According to an embodiment of the present utility model, as understood with reference to fig. 1, the zinc hydrometallurgy unit 200 includes an electrolytic zinc subunit and a zinc-iron separation subunit, the zinc-iron separation subunit includes a hematite iron removal device, and the waste electrolyte generated by the electrolytic zinc subunit is acidic, and can be used for not only the pre-soaking treatment of the zinc ore or the leaching treatment after roasting of the zinc ore, but also the acid leaching treatment of the zinc ore leaching residue, etc., for example, the waste electrolyte can be used for performing hot acid reduction leaching on the zinc ore leaching residue, etc., wherein, increasing the temperature of the waste electrolyte can not only increase the efficiency and effect of the reaction in which the waste electrolyte participates, but also reduce the energy required for heating the waste electrolyte and reduce the cost. The temperature of the washing wastewater generated after the hematite iron removal tail gas is washed by using cooling water can reach 80-100 ℃, the waste heat recovery and utilization value is low, so that the problem of waste heat waste of the part exists in the related field. According to the utility model, the waste electrolyte is heated by utilizing the waste heat carried by the washing wastewater, so that ingenious conversion of heat energy can be realized in a zinc hydrometallurgy system, win-win effect of cooling the washing wastewater and heating the waste electrolyte is realized, the treatment efficiency and effect of a reaction part in which the waste electrolyte participates can be improved, the energy consumption required by cooling the washing wastewater can be reduced, and when the waste electrolyte subjected to heat exchange is used for hot acid reduction leaching of zinc ore leaching residues, the steam quantity required by heating the liquid after iron removal to realize iron removal of hematite can be reduced, so that the production stability and separation effect of a zinc-iron separation subunit can be further improved, the resource utilization rate of the waste heat is greatly improved, and the production cost is reduced.
As understood in conjunction with fig. 1-2, the exhaust gas scrubbing unit 100 may include: an exhaust condenser (not shown), which may include a hematite iron removal tail gas inlet 102, a venturi scrubber (not shown), which may include a cooling water inlet 101, and a separator (not shown), which may include a wash wastewater outlet 103, which are sequentially connected. Specifically, the hematite iron-removing tail gas generated in the zinc-iron separation unit is supplied to an exhaust condenser, decompression condensation treatment is carried out in the exhaust condenser, then the tail gas after decompression condensation treatment is introduced into a venturi scrubber, cooling and dust removal treatment are carried out on the tail gas by using cooling water, finally the gas and washing wastewater after dust removal are separated by a separator, and the washing wastewater is discharged from the separator and is introduced into the heat exchange device 300 for heat exchange treatment with waste electrolyte.
As understood in connection with fig. 2, the exhaust gas scrubbing unit 100 may further comprise: the inlet end 111 of the tail gas washing wastewater storage tank 110 may be connected to the washing wastewater outlet 103, and the outlet end 112 of the tail gas washing wastewater storage tank 110 may be connected to the washing wastewater inlet 301 via the first transfer pump 400. Through setting up tail gas washing waste water storage tank 110, can store the tail gas washing waste water that washing tail gas produced, store to a certain amount after, rethread first delivery pump 400 supplies into heat transfer device 300, from this not only is favorable to shortening heat transfer device 300's duration, improves heat exchange efficiency, reduces energy consumption and manufacturing cost, still is favorable to reinforcing washing waste water's waste heat recovery effect, improves the energy utilization.
As understood in connection with fig. 2, the exhaust gas scrubbing unit 100 may further comprise: the cooling tower 120, the inlet end 121 of the cooling tower 120 may be connected to the heat exchanged washing wastewater outlet 303, and the outlet end 122 of the cooling tower 120 may be connected to the cooling water inlet 101. Therefore, the washing wastewater subjected to heat exchange can be cooled to obtain cooling water, and the cooling water can be used for washing the hematite iron-removing tail gas, so that the resource utilization rate of the washing wastewater is improved, the consumption of externally supplied cooling water is reduced, and the production cost can be effectively reduced. Further, according to some specific examples of the present utility model, the cooling tower 120 may be a circulation cooling tower, thereby more advantageously improving the cooling effect on the washing wastewater.
As understood in connection with fig. 3, the exhaust gas scrubbing unit 100 may further comprise, in accordance with an embodiment of the present utility model: the cooling water storage tank 130, the cooling water storage tank 130 may include a cooling water storage area 131 and a cooling water storage area 132 to be separately disposed, an inlet end of the cooling water storage area 132 to be cooled may be connected to the heat exchanged washing wastewater outlet 303, and an outlet end of the cooling water storage area 132 to be cooled may be connected to the inlet end 121 of the cooling tower; an inlet end of the cooling water storage area 131 may be connected to the outlet end 122 of the cooling tower 120, and an outlet end of the cooling water storage area 131 may be connected to the cooling water inlet 101. Specifically, the washing wastewater (i.e. water to be cooled) after heat exchange can be stored in the water storage area 132 to be cooled in the cooling water storage tank 130, and when a certain storage amount is provided, the washing wastewater is introduced into the cooling tower 120 for cooling, so that the continuous working time of the cooling tower can be shortened, the energy loss is reduced, and the cooling efficiency is improved; in addition, the cooled washing wastewater can be supplied to the cooling water storage area 131 to be stored, and the washing wastewater is uniformly introduced into the tail gas washing unit 100 through the cooling water inlet when in use, so that the cooling and washing efficiency and effect on the hematite tail gas can be effectively improved.
According to an embodiment of the present utility model, as will be understood with reference to fig. 3, a circulation pump 500 may be provided between the outlet end of the water storage area 132 to be cooled and the inlet end 121 of the cooling tower 120, and may be used to convey the heat-exchanged washing wastewater stored in the water storage area to be cooled; in addition, a second transfer pump 600 for transferring the cooling water stored in the cooling water storage area may be provided between the outlet end of the cooling water storage area 132 and the cooling water inlet 101.
As understood in connection with fig. 3, the zinc hydrometallurgy unit 200 may further comprise, in accordance with an embodiment of the utility model: a first waste electrolyte reservoir 230 and a second waste electrolyte reservoir 240, the inlet end of the first waste electrolyte reservoir 230 may be connected to the waste electrolyte outlet 201, the outlet end of the first waste electrolyte reservoir 230 may be connected to the waste electrolyte inlet 302 via a third transfer pump 700, and the heat exchanged waste electrolyte outlet 304 may be connected to the inlet end of the second waste electrolyte reservoir 240. By arranging the first waste electrolyte storage tank 230, the waste electrolyte can be stored, and when the waste electrolyte is stored to a certain amount, the waste electrolyte is conveyed to the heat exchange device 300 through the third conveying pump 700, so that the continuous working time of the heat exchange device 300 is shortened, the heat exchange efficiency is improved, the energy consumption and the production cost are reduced, the heat energy recovery effect of the washing wastewater is enhanced, and the energy utilization rate is improved; by providing the second spent electrolyte reservoir 240, the spent electrolyte after heat exchange can be stored for use in subsequent processes (e.g., hot acid reduced zincite leaching residue, etc.).
According to an embodiment of the present utility model, as will be understood from fig. 3, a temperature measuring device (not shown) may be disposed in the second spent electrolyte storage tank 240, so that the temperature of the spent electrolyte after heat exchange may be measured, so that the amount of steam required for heating up the spent electrolyte can be more accurately controlled when the spent electrolyte is subjected to subsequent treatment, which is beneficial to further improving the energy utilization rate and reducing the production cost.
According to an embodiment of the present utility model, the heat exchanging device 300 may include a spiral plate type heat exchanger, thereby facilitating further improvement of heat transfer efficiency and heat exchanging effect.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (10)
1. The hematite tail gas waste heat recovery system is characterized by comprising:
the tail gas washing unit comprises a cooling water inlet, a hematite iron removal tail gas inlet and a washing wastewater outlet;
the zinc hydrometallurgy unit comprises an electrolytic zinc subunit and a zinc-iron separation subunit, wherein the electrolytic zinc subunit comprises a waste electrolyte outlet, the zinc-iron separation subunit comprises a hematite iron removal tail gas outlet, and the hematite iron removal tail gas outlet is connected with the hematite iron removal tail gas inlet;
the heat exchange device comprises a washing wastewater inlet, a waste electrolyte inlet, a washing wastewater outlet after heat exchange and a waste electrolyte outlet after heat exchange, wherein the washing wastewater inlet is connected with the washing wastewater outlet, and the waste electrolyte inlet is connected with the waste electrolyte outlet.
2. The hematite tail gas waste heat recovery system of claim 1, wherein the tail gas scrubbing unit comprises: the device comprises an exhaust condenser, a Venturi scrubber and a separator, wherein the exhaust condenser comprises an iron-removing tail gas inlet of hematite, the Venturi scrubber comprises a cooling water inlet, and the separator comprises a washing wastewater outlet.
3. The hematite tail gas waste heat recovery system of claim 1 or 2, wherein the tail gas scrubbing unit further comprises: the tail gas washing wastewater storage tank, the inlet end of the tail gas washing wastewater storage tank is connected with the washing wastewater outlet, and the outlet end of the tail gas washing wastewater storage tank is connected with the washing wastewater inlet through the first conveying pump.
4. The hematite tail gas waste heat recovery system of claim 1 or 2, wherein the tail gas scrubbing unit further comprises: and the inlet end of the cooling tower is connected with the washing wastewater outlet after heat exchange, and the outlet end of the cooling tower is connected with the cooling water inlet.
5. The hematite tail gas waste heat recovery system of claim 4, wherein the cooling tower is a circulating cooling tower.
6. The hematite tail gas waste heat recovery system of claim 4, wherein the tail gas scrubbing unit further comprises: the cooling water storage tank comprises a cooling water storage area and a water storage area to be cooled, which are arranged in a separated mode, wherein the inlet end of the water storage area to be cooled is connected with the washing wastewater outlet after heat exchange, and the outlet end of the water storage area to be cooled is connected with the inlet end of the cooling tower; the inlet end of the cooling water storage area is connected with the outlet end of the cooling tower, and the outlet end of the cooling water storage area is connected with the cooling water inlet.
7. The hematite tail gas waste heat recovery system according to claim 6, wherein a circulating pump is arranged between the outlet end of the water storage area to be cooled and the inlet end of the cooling tower; and/or a second delivery pump is arranged between the outlet end of the cooling water storage area and the cooling water inlet.
8. The hematite tail gas waste heat recovery system of claim 1 or 7, wherein the zinc hydrometallurgy unit further comprises: the device comprises a first waste electrolyte storage tank and a second waste electrolyte storage tank, wherein the inlet end of the first waste electrolyte storage tank is connected with the waste electrolyte outlet, the outlet end of the first waste electrolyte storage tank is connected with the waste electrolyte inlet through a third conveying pump, and the waste electrolyte outlet after heat exchange is connected with the inlet end of the second waste electrolyte storage tank.
9. The hematite tail gas waste heat recovery system of claim 8, wherein the second waste electrolyte reservoir is provided with a temperature measuring device.
10. The hematite tail gas waste heat recovery system of claim 1, wherein the heat exchange device comprises a spiral plate heat exchanger.
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| CN202223542387.2U CN219103737U (en) | 2022-12-29 | 2022-12-29 | Hematite tail gas waste heat recovery system |
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| CN202223542387.2U CN219103737U (en) | 2022-12-29 | 2022-12-29 | Hematite tail gas waste heat recovery system |
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