A system for recycling waste water from a tin smelting waste heat boiler

Abstract

The utility model discloses a kind of tin smelting waste heat boiler blowdown water's resource utilization system, belong to sewage resource utilization technical field.The system includes tin smelting waste heat boiler, flash tank, heat exchanger, deoxidizer and spray tower connected in turn, and tin smelting waste heat boiler and flash tank are connected with deoxidizer respectively;It also includes desalted water tank, and desalted water tank is connected with heat exchanger.The utility model can effectively solve the problems of energy waste, water resource waste and environmental pollution in the treatment of boiler blowdown water in the prior art, realize the heat recovery of boiler blowdown water, water resource reuse and reduce pollutant emission, achieve the effect of energy saving and emission reduction and resource efficient use.

Description

Technical Field

[0001] This utility model relates to the field of wastewater resource utilization technology, and more specifically to a resource utilization system for wastewater discharged from a tin smelting waste heat boiler. Background Technology

[0002] The main equipment for tin smelting includes fuming furnaces, top-blown furnaces, electric furnaces, and rotary kilns. A large amount of heat is generated during the production process. If it is not recovered, it will not only cause a large loss of heat energy, but also affect the air temperature when it is released into the atmosphere.

[0003] To efficiently recover heat energy from various furnaces and kilns in tin smelting, boilers are used to produce steam for power generation and to supply heat for acid production. However, boiler operation generates a large amount of wastewater, which typically has high temperature and pressure and contains impurities, salts, and other substances. Traditional methods for treating boiler wastewater are relatively simple and crude, directly discharging it into wastewater treatment systems. This not only wastes a significant amount of water resources but also leads to heat loss and environmental pollution. Meanwhile, with increasingly stringent environmental protection requirements and rising energy costs, how to efficiently utilize boiler wastewater to achieve energy conservation, emission reduction, and resource recovery has become an urgent problem to be solved.

[0004] Therefore, how to develop a resource utilization system for waste heat boiler exhaust from tin smelting that is easy to operate, has good technical and economic indicators, and has virtually no safety and environmental risks is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This utility model aims to at least partially solve one of the aforementioned technical problems in the prior art.

[0006] Therefore, one objective of this utility model is to propose a resource utilization system for wastewater from a tin smelting waste heat boiler, comprising a tin smelting waste heat boiler, a flash tank, a heat exchanger, a deoxidizer, and a spray tower connected in sequence, wherein the tin smelting waste heat boiler and the flash tank are respectively connected to the deoxidizer.

[0007] It also includes a demineralized water tank, which is connected to the heat exchanger.

[0008] The demineralized water tank is used to hold demineralized water, the flash tank is used to receive wastewater discharged from the waste heat boiler of tin smelting, the heat exchanger (plate type) is used to exchange heat between the demineralized water and the wastewater discharged from the waste heat boiler of tin smelting flowing out of the flash tank, the deaerator is used to remove oxygen from the demineralized water, and the spray tower is used to receive the gas discharged from the deaerator. All equipment is connected by pipelines.

[0009] The demineralized water tank is connected to the heat exchanger by a pipeline. The demineralized water flows from the demineralized water tank into the heat exchanger and exchanges heat with the wastewater from the tin smelting waste heat boiler after it has been depressurized and flashed in the flash tank. After the wastewater is cooled, it flows into the cooling water pool through the pipeline. The demineralized water absorbs the heat from the wastewater in the heat exchanger and then flows into the deaerator, where it absorbs the heat from the steam in the flash tank to raise its temperature and deoxidize. When the steam heat provided by the flash tank is insufficient, the electric valve connecting the tin smelting waste heat boiler and the deaerator is opened, and the steam from the tin smelting waste heat boiler is used to raise the temperature of the demineralized water. After the deoxidation meets the standards, it is sent to the tin smelting waste heat boiler for use. The oxygen and water vapor discharged during the deoxidation process of the deaerator enter the spray tower through the steam pipeline. After the water vapor is cooled, it is added to the production water.

[0010] Furthermore, the resource utilization system for the wastewater from the tin smelting waste heat boiler also includes a cooling water pool, which is connected to a heat exchanger.

[0011] The further beneficial effect of adopting the above is that the cooling water pool is used to receive the cooled wastewater.

[0012] Furthermore, the resource utilization system for the wastewater from the tin smelting waste heat boiler also includes an electric valve, which is installed between the tin smelting waste heat boiler and the deaerator.

[0013] The further beneficial effect of adopting the above is that the electric valve is used to control the switching of the waste heat boiler and deoxidizer pipeline in tin smelting.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a resource utilization system for waste heat boiler wastewater from tin smelting, which can effectively solve the problems of energy waste, water waste and environmental pollution in the treatment of boiler wastewater in the prior art, realize the heat energy recovery of boiler wastewater, water resource reuse and reduce pollutant emissions, and achieve the effects of energy conservation, emission reduction and efficient resource utilization. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 A schematic diagram of the structure of the wastewater utilization system for tin smelting waste heat boiler provided by this utility model;

[0017] Among them, 1-waste heat boiler, 2-flash tank, 3-heat exchanger, 4-cooling water pool, 5-demineralized water tank, 6-spray tower, 7-deaerator, 8-electric valve. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] This utility model discloses a resource utilization system for wastewater from tin smelting waste heat boilers, such as... Figure 1 As shown, the system includes a tin smelting waste heat boiler 1, a flash tank 2, a heat exchanger 3, a deoxidizer 7, and a spray tower 6 connected in sequence. The tin smelting waste heat boiler 1 and the flash tank 2 are respectively connected to the deoxidizer 7. It also includes a demineralized water tank 5, which is connected to the heat exchanger 3. The demineralized water tank 5 is used to hold demineralized water, the flash tank 2 is used to receive wastewater discharged from the tin smelting waste heat boiler 1, the heat exchanger 3 (plate type) is used for heat exchange between the demineralized water and the wastewater flowing out of the flash tank 2, the deoxidizer 7 is used to remove oxygen from the demineralized water, and the spray tower 6 is used to receive the gas discharged from the deoxidizer 7. All equipment is connected by pipelines.

[0024] In one embodiment, such as Figure 1 As shown, the resource utilization system for wastewater from tin smelting waste heat boilers also includes a cooling water tank 4, which is connected to a heat exchanger 3 to receive the cooled wastewater.

[0025] In one embodiment, such as Figure 1 As shown, the resource utilization system for wastewater from tin smelting waste heat boilers also includes an electric valve 8, which is installed between the tin smelting waste heat boiler 1 and the deoxidizer 7 to control the opening and closing of the pipeline between the tin smelting waste heat boiler 1 and the deoxidizer 7.

[0026] Example 1

[0027] Taking an 80t waste heat boiler of a tin smelter with a capacity of 75,000 tons of refined tin per year as the research object, the following method is adopted: Figure 1 The resource utilization system for wastewater from a tin smelting waste heat boiler, as shown, includes the following steps:

[0028] (1) The wastewater in the 80t tin smelting waste heat boiler 1 flows into the flash tank 2 through the wastewater pipe for depressurization flash evaporation. The steam enters the deaerator 7 through the steam pipe above the flash tank 2. The wastewater is discharged from the bottom of the flash tank 2 and then enters the heat exchanger 3.

[0029] (2) The demineralized water in the demineralized water tank 5 enters the heat exchanger 3 through the guide pipe. In the heat exchanger 3, it exchanges heat with the wastewater from the flash tank 2. After the demineralized water is heated to 78°C, it is introduced into the deaerator 7 with a pressure of 0.36MPa. After the wastewater is cooled to 28°C, it flows into the cooling water pool 4 and is used as production water and equipment cooling water.

[0030] (3) The demineralized water in the deoxidizer 7 comes into contact with the steam from the flash tank 2 and is rapidly heated to 105°C for deoxidation. The gas enters the spray tower 6 through the top pipe of the deoxidizer 7 to cool down. The deoxidized water is then pumped into the tin smelting waste heat boiler 1 for use.

[0031] Example 1 can heat 50t of demineralized water to 105℃ per day, with an oxygen content of <15μg / L, and recover 65t of wastewater.

[0032] Example 2

[0033] Taking an 85t waste heat boiler of a tin smelter with a capacity of 75,000 tons of refined tin per year as the research object, the following method is adopted: Figure 1 The resource utilization system for wastewater from a tin smelting waste heat boiler, as shown, includes the following steps:

[0034] (1) The wastewater in the 85t tin smelting waste heat boiler 1 flows into the flash tank 2 through the wastewater pipe for depressurization flash evaporation. The steam enters the deaerator 7 through the steam pipe above the flash tank 2. The wastewater is discharged from the bottom of the flash tank 2 and then enters the heat exchanger 3.

[0035] (2) The demineralized water in the demineralized water tank 5 enters the heat exchanger 3 through the guide pipe. In the heat exchanger 3, it exchanges heat with the wastewater from the flash tank 2. After the demineralized water is heated to 80°C, it is introduced into the deaerator 7 with a pressure of 0.37MPa. After the wastewater is cooled to 25°C, it flows into the cooling water pool 4 and is used as production water and equipment cooling water.

[0036] (3) The demineralized water in the deoxidizer 7 comes into contact with the steam from the flash tank 2 and is rapidly heated to 106°C for deoxidation. The gas enters the spray tower 6 through the top pipe of the deoxidizer 7 to cool down. The deoxidized water is then pumped into the tin smelting waste heat boiler 1 for use.

[0037] Example 2 can heat 54t of demineralized water to 106℃ per day, with an oxygen content of <15μg / L, and recover 68t of wastewater.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A resource utilization system for wastewater from tin smelting waste heat boilers, characterized in that, It includes a tin smelting waste heat boiler, a flash tank, a heat exchanger, a deoxidizer, and a spray tower connected in sequence, wherein the tin smelting waste heat boiler and the flash tank are respectively connected to the deoxidizer; It also includes a demineralized water tank, which is connected to the heat exchanger.

2. The resource utilization system for wastewater from tin smelting waste heat boilers according to claim 1, characterized in that, It also includes a cooling water tank, which is connected to the heat exchanger.

3. The resource utilization system for wastewater from tin smelting waste heat boilers according to claim 1, characterized in that, It also includes an electric valve, which is located between the tin smelting waste heat boiler and the deoxidizer.

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