A copper double-flash smelter heat recovery ring network process

Abstract

The application discloses a kind of copper double flash smelting plant heat recovery ring network process and system, comprising: (1) the different pressure grades steam generated by melt blowing waste heat boiler, conversion waste heat boiler, dry absorption boiler is input to different gas equipment by pipe network, and the condensate formed by steam heat exchange is entered into condensate tank by pipe network;(2) condensate is divided into two ways by condensate pump, one way is transported to deaerator, and one way enters desalted water tank;(3) the desalted water generated by chemical water treatment station, one way is transported to deaerator for deaeration, and one way is transported to dry absorption boiler;(4) deaerator receives condensate and desalted water, and transports after deaeration;(5) desalted water is transported to dry absorption boiler to generate low-pressure steam;In the application, the steam condensate generated in smelting process is not discharged with steam, so that the condensate directly forms closed loop in pipeline, and the heat energy itself can be better used for production, realizes complete recycling of condensate, and has the advantages of energy saving and emission reduction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heat energy recovery, in particular to a copper double flash smelter heat energy recovery ring network process. BACKGROUND

[0002] In the smelting process, various boilers will produce a large amount of steam, and the steam will form condensate water in the process. The subsequent treatment of the condensate water is a relatively important link in the smelting process. At present, most processes directly discharge the condensate water, or uniformly collect the condensate water, and after cooling, the condensate water is supplemented to the water use process as new water. However, neither of the above methods can realize the recycling of the condensate water, resulting in the waste of resources and the increase of production cost. SUMMARY

[0003] The main purpose of the present application is to provide a copper double flash smelter heat energy recovery ring network process, which aims to solve the existing technical problems.

[0004] To achieve the above-mentioned purpose, the present application provides a copper double flash smelter heat energy recovery ring network process, which comprises:

[0005] (1) The different pressure grade steam generated by the smelting blow waste heat boiler, the conversion waste heat boiler and the dry absorption boiler is input to different gas using equipment through the pipe network, and the condensate water formed in the process is divided into high pressure condensate water, medium pressure condensate water and low pressure condensate water and enters the condensate water tank;

[0006] (2) The condensate water is divided into two paths by the condensate water pump, one path is transported to the deaerator for deoxygenation, and the other path enters the desalted water tank;

[0007] (3) The desalted water generated by the chemical water treatment station is mixed with the condensate water in the condensate water tank, and is divided into two paths by the desalted water pump, one path is transported to the deaerator for deoxygenation, and the other path is transported to the dry absorption boiler;

[0008] (4) The deaerator receives the condensate water from the condensate water tank and the desalted water, and after deoxygenation, transports to the smelting blow waste heat boiler and the conversion waste heat boiler for heat exchange to generate steam of corresponding pressure grade, thereby forming a cycle;

[0009] (5) The desalted water is transported to the dry absorption boiler to generate low pressure steam, thereby forming a cycle.

[0010] Further, the condensate water generated by the conversion waste heat boiler forms a steam-water mixture through the medium pressure steam using equipment, and the steam-water mixture enters the condensate water tank after expansion and pressure reduction.

[0011] Further, the condensate water tank is provided with a remote liquid level meter, and the pipelines in the process are provided with electric regulating valves. The water amount transported from the condensate water tank to the desalted water tank is timely distributed through the change of water flow and the change of steam flow.

[0012] Further, through the data feedback of the remote liquid level meter, the excess condensate water is timely shunted to the side water tank, the bottom of the side water tank is attached to the condensate water main pipeline and a heat conducting plate is arranged therebetween, and the side water tank is communicated with the condensate water tank through a pipeline, for balancing the amount of condensate water in the condensate water tank.

[0013] Further, the side water tank is communicated with the condensate water main pipeline through a circulating water pipeline, and the condensate water in the side water tank is circulated by a circulating water pump to keep the temperature and liquid level.

[0014] Further, the water source entering the deaerator is condensate water with a temperature of 80-120 DEG C.

[0015] A condensate water recycling device for a copper double-flash smelting plant, comprising a smelting blow residual heat boiler, a conversion residual heat boiler and a dry absorption boiler, the steam generated by the smelting blow residual heat boiler, the conversion residual heat boiler and the dry absorption boiler is respectively delivered to corresponding steam using equipment through pipelines, the steam using equipment is connected with a condensate water tank through respective pipelines, the condensate water tank is connected with a deaerator and a desalted water tank through two pipelines respectively by a condensate water pump, the desalted water tank is connected with the deaerator and the dry absorption boiler through two pipelines respectively by a desalted water pump, and the deaerator delivers the condensate water and the desalted water to the smelting blow residual heat boiler and the conversion residual heat boiler after deaeration.

[0016] Further, the steam using equipment comprises high pressure steam using equipment connected with the smelting blow residual heat boiler, medium pressure steam using equipment connected with the conversion residual heat boiler and low pressure steam using equipment connected with the dry absorption boiler, and the condensate water formed by the medium pressure steam using equipment enters the condensate water tank through a first expansion vessel and a second expansion vessel.

[0017] Further, the high pressure steam using equipment is two high pressure steam turbine units, the medium pressure steam using equipment is a steam drying machine or a drying dust collecting bag, and the low pressure steam using equipment is a low pressure steam turbine unit, an electrolytic tank, a dust collecting bag or a heat exchanger.

[0018] The beneficial effects of the present application are embodied in:

[0019] In the present application, the steam generated in the smelting process and the steam condensate water formed by steam heat exchange are not discharged, and the steam condensate water is always in a high temperature state in the pipeline to form a closed loop circulation, so that the heat energy itself is not lost in the circulation process and is fully utilized, realizing complete recycling of the condensate water and having the advantages of energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application is a process flow diagram.

[0021] BRIEF DESCRIPTION OF REFERENCE NUMERALS

[0022] 1, melt blowing waste heat boiler; 2, conversion waste heat boiler; 3, dry absorption boiler; 4, high pressure steam equipment; 5, medium pressure steam equipment; 6, low pressure steam equipment; 7, first stage expansion vessel; 8, second stage expansion vessel; 9, condensate tank; 10, condensate pump; 11, demineralized water tank; 12, deaerator; 13, demineralized water pump; 14-35, electric regulating valve. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] Embodiment one: please refer to Figure 1 The present application is a copper double-flash smelter heat energy recovery ring network process, comprising:

[0025] (1) the melt blowing waste heat boiler 1, the conversion waste heat boiler 2 and the dry absorption boiler 3 respectively generate steam of different pressure levels which are input to different gas equipment through a pipe network. In this process, the condensate formed is divided into high pressure condensate, medium pressure condensate and low pressure condensate which are input to the condensate tank 9;

[0026] (2) the condensate is divided into two paths by the condensate pump 10, one path is transported to the deaerator 12 for deaeration, and the other path is input to the demineralized water tank 11;

[0027] (3) the demineralized water generated by the chemical water treatment station is mixed with the condensate of the condensate tank 9, and is divided into two paths by the demineralized water pump 13, one path is transported to the deaerator 12 for deaeration, and the other path is transported to the dry absorption boiler 3;

[0028] (4) the deaerator 12 receives the condensate from the condensate tank 9 and the demineralized water, and after deaeration, transports them to the melt blowing waste heat boiler 1 and the conversion waste heat boiler 2 for heat exchange to generate steam of corresponding pressure levels, thereby forming a cycle;

[0029] (5) the demineralized water is transported to the dry absorption boiler 3 to generate low pressure steam, thereby forming a cycle.

[0030] The process makes full use of the abundant heat energy resources in the copper smelting industry, and reasonably allocates and utilizes the heat energy resources, reduces a large amount of heat energy and kinetic energy consumption, improves the energy utilization efficiency and the flexibility of energy allocation, and recycles a large proportion of water resources and waste heat resources to save a large amount of energy, so that the condensed water directly forms a closed loop in the pipeline, and the heat energy itself can be better used for production, realizing complete recycling of the condensed water and having the advantages of energy saving and emission reduction.

[0031] In an embodiment, the condensed water generated by the conversion waste heat boiler 2 forms a steam-water mixture with the medium-pressure steam equipment 5, and the steam-water mixture enters the condensed water tank 9 after being expanded and depressurized.

[0032] In this embodiment, the unstable condensed water source generated by the unstable working condition of the steam equipment directly impacts the condensed water tank, and the stable heat energy recycling is formed after sufficient expansion and pressure reduction. The continuous blowdown amount is automatically adjusted with the boiler feedwater load to maintain a relatively stable blowdown rate.

[0033] In an embodiment, the condensed water tank 9 is provided with a remote liquid level meter, and the pipelines in the process are provided with electric regulating valves. The water quantity delivered from the condensed water tank 9 to the demineralized water tank 11 is timely distributed through changes in water flow and steam flow.

[0034] In this embodiment, by monitoring the liquid level of the condensed water tank 9 in real time and cooperating with the electric regulating valve, the water quantity delivered from the condensed water tank 9 to the demineralized water tank 11 is ensured to be within a reasonable range, which can avoid too much high-temperature condensed water entering the demineralized water tank to affect the formation of normal-temperature demineralized water and further affect the subsequent water equipment, and can also avoid too little condensed water returning to the demineralized water tank to cause the demineralized water system to need to produce more demineralized water, resulting in waste of resources and further ensuring efficient recycling of the condensed water.

[0035] In an embodiment, through data feedback of the remote liquid level meter, excess condensed water is timely diverted to a side tank, the bottom of the side tank is attached to the condensed water main pipeline and a heat conduction plate is arranged therebetween, and the side tank is connected to the condensed water tank 9 through a pipeline for balancing the condensed water quantity in the condensed water tank 9.

[0036] In this embodiment, when the condensed water tank 9 reaches saturation, the continuously delivered condensed water is guided into the side tank for temporary storage, and the condensed water in the side tank is called to the condensed water tank 9 at any time according to the subsequent recycling situation, thereby avoiding the problem that the subsequent condensed water is difficult to be effectively treated when the condensed water tank 9 reaches saturation, and the side tank is attached to the condensed water main pipeline, which can effectively ensure the temperature of the condensed water in the side tank, so that the condensed water can be directly used subsequently without additional heating, thereby avoiding the problem of energy waste.

[0037] In practice, there are two condensate tanks, both of which are 50m3 water tanks, and the condensate tanks A and B are connected through a pipeline, and the connecting pipe has a valve, in addition, each condensate recovery pipe into the water tank is divided into two ways, one way into A, and one way into B, to ensure that the two water tanks can be decomposed at any time, forming a single water tank operation, which can also run double water tank operation, to ensure that all the condensate is received in the water tank without overflow.

[0038] In an embodiment, the side water tank is connected to the condensate main pipeline through a circulating water pipe, and the circulating water pump circulates the condensate in the side water tank to maintain the temperature and liquid level.

[0039] In this embodiment, the condensate in the side water tank is always in an alternating circulating flow state through the circulating water pipe connected to the condensate main pipeline, so that there is a place to store excess condensate, and the continuous flow of condensate can be ensured, and the problem of rapid temperature drop can be avoided, ensuring that it can be used at any time.

[0040] In an embodiment, the water source introduced into the deaerator 12 is condensate with a temperature of 80-120℃. In this embodiment, since the water temperature of the deaerator 12 is 102-105℃, and the condensate generated in the smelting process is maintained at 80-120℃ during transportation, the temperature difference between the condensate entering the deaerator 12 and the built-in water temperature is small, which can avoid the problem of corrosion of the deaerator 12, and also can make better use of the heat energy possessed by the condensate itself.

[0041] Embodiment two: please refer to Figure 1 A condensate recovery device for copper double-flash smelting plant, comprising a smelting blow waste heat boiler 1, a conversion waste heat boiler 2, and a dry absorption boiler 3. The steam generated by the smelting blow waste heat boiler 1, the conversion waste heat boiler 2, and the dry absorption boiler 3 is respectively transported to the corresponding steam-using equipment through pipelines. The steam-using equipment is connected to a condensate tank 9 through the respective connecting pipelines. The condensate tank 9 is connected to a deaerator 12 and a desalted water tank 11 through two pipelines by a condensate pump 10. The desalted water tank 11 is connected to the deaerator 12 and the dry absorption boiler 3 through two pipelines by a desalted water pump 13. The deaerator 12 transports the deaerated condensate and desalted water to the smelting blow waste heat boiler 1 and the conversion waste heat boiler 2 through a pipeline.

[0042] The embodiment is configured in this way, the steam pipe network is divided into three levels of high, medium and low by using different steam pressures, and the condensate water generated along with the steam is also divided into high-pressure condensate water, medium-pressure condensate water and low-pressure condensate water pipe networks. The condensate water of the high, medium and low pressure pipe networks is collected into the condensate water tank 9, wherein the steam drying condensate water generated by the special steam equipment steam dryer is expanded by the first and second expansion vessels and then enters the condensate water tank 9, and the condensate water enters the condensate water tank 9 and is then divided into two routes by the condensate water pump 10, one of which enters the deaerator 12 to remove oxygen and then supply the boiler to form steam, thereby forming a cycle; the other is connected to the demineralized water tank 11 and mixed with the demineralized water made by the chemical treatment station, and is supplied to the deaerator 12 by the demineralized water pump 13, thereby forming a cycle. The above-mentioned management is provided with an electric regulating valve, the condensate water tank 9 contains a remote liquid level, and each device is controlled and operated by a dcs control system.

[0043] In an embodiment, the steam equipment includes a high-pressure steam equipment 4 connected with the smelting blowdown waste heat boiler 1, a medium-pressure steam equipment 5 connected with the conversion waste heat boiler 2 and a low-pressure steam equipment 6 connected with the dry absorption boiler 3, and the condensate water formed by the medium-pressure steam equipment 5 enters the condensate water tank 9 via the first expansion vessel 7 and the second expansion vessel 8.

[0044] In an embodiment, the high-pressure steam equipment 4 is two high-pressure steam turbine units, the medium-pressure steam equipment 5 is a steam dryer or a drying dust cloth bag, and the low-pressure steam equipment 6 is a low-pressure steam turbine unit, an electrolytic cell, a dust cloth bag or a heat exchanger.

[0045] It should be noted that if the embodiment of the present application involves directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0046] In addition, if the embodiment of the present application involves descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, "multiple" refers to two or more. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist.

[0047] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A ring network process for heat recovery in a copper double flash smelter, characterized in that... ,include: (1) The melt-blown waste heat boiler, the conversion waste heat boiler and the dry suction boiler generate steam of different pressure levels, which are then input into different gas-using equipment through the pipeline network. The condensate formed in this process is divided into high-pressure condensate, medium-pressure condensate and low-pressure condensate and enters the condensate tank. (2) The condensate is divided into two paths by the condensate pump. One path is sent to the deaerator for deoxygenation; the other path enters the demineralized water tank. (3) The demineralized water produced by the chemical water treatment plant is mixed with the condensate in the condensate tank and then divided into two streams by the demineralized water pump. One stream is sent to the deaerator for deoxygenation, and the other stream is sent to the dry-suction boiler. (4) The deaerator receives condensate and demineralized water from the condensate tank. After deaeration, it is sent to the melt-blown waste heat boiler and the conversion waste heat boiler for heat exchange to generate steam of the corresponding pressure level, thus forming a cycle. (5) Demineralized water is transported to the dry-suction boiler to generate low-pressure steam, thus forming a cycle; The condensate generated by the waste heat conversion boiler is used to form a steam-water mixture via a medium-pressure steam-using device. This steam-water mixture is then expanded and depressurized before entering the condensate tank. The condensate tank is equipped with a remote level gauge, and all pipelines in the process are equipped with electric regulating valves to promptly allocate the amount of water delivered from the condensate tank to the demineralized water tank based on changes in water flow and steam flow. Based on the data feedback from the remote liquid level gauge, excess condensate is diverted to the side water tank in a timely manner. The bottom of the side water tank is in close contact with the main condensate pipe and a heat-conducting plate is provided between them. The side water tank is connected to the condensate tank through a pipe to balance the amount of condensate in the condensate tank. The side water tank is connected to the main condensate pipe through a circulating water pipe, and the condensate in the side water tank is circulated by a circulating water pump to maintain the temperature and liquid level.

2. The ring network process for heat recovery in a copper double flash smelter as described in claim 1, characterized in that: The deaerator is supplied with condensate at a temperature of 80-120℃.

3. A copper double flash smelter heat recovery system for implementing the ring network process for heat recovery in a copper double flash smelter as described in any one of claims 1-2, the system comprising a molten blowing waste heat boiler, a conversion waste heat boiler, and a dry absorption boiler, characterized in that: The steam generated by the blown waste heat boiler, the conversion waste heat boiler, and the dry suction boiler is transported to the corresponding steam-using equipment through pipelines. The steam-using equipment is connected to the condensate tank through its own connecting pipeline. The condensate tank is connected to the deaerator and the demineralized water tank through a condensate pump and two pipelines respectively. The demineralized water tank is connected to the deaerator and the dry suction boiler through a demineralized water pump and two pipelines respectively. The deaerator deoxygenates the condensate and demineralized water through pipelines and then transports them to the blown waste heat boiler and the conversion waste heat boiler.

4. A copper double flashover smelter heat recovery system as described in claim 3, characterized in that: The steam-using equipment includes high-pressure steam-using equipment connected to the melt-blown waste heat boiler, medium-pressure steam-using equipment connected to the conversion waste heat boiler, and low-pressure steam-using equipment connected to the dry-suction boiler. The condensate generated by the medium-pressure steam-using equipment enters the condensate tank through a primary expansion tank and a secondary expansion tank.

5. A copper double flashover smelter heat recovery system as described in claim 4, characterized in that: The high-pressure steam-using equipment consists of two high-pressure steam turbine units, the medium-pressure steam-using equipment consists of a steam dryer or a dry dust collection bag, and the low-pressure steam-using equipment consists of a low-pressure steam turbine unit, an electrolytic cell, a dust collection bag, or a heat exchanger.

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