Device and system for treating high-salinity wastewater by utilizing sintering flue gas waste heat

Abstract

The utility model discloses a device and system for treating high salinity wastewater by utilizing sintering flue gas waste heat, the device for treating high salinity wastewater by utilizing sintering flue gas waste heat comprises an upper cylinder body and a lower cylinder body assembled with the upper cylinder body into a whole, the chamber of the lower cylinder body is divided into a to-be-treated chamber, a heat exchange chamber and a treated chamber which are mutually independent, a high-temperature medium is introduced into the heat exchange chamber, to-be-treated wastewater is introduced into the to-be-treated chamber, a water passing pipe is arranged in the heat exchange chamber, the treated chamber is connected with a main drainage pipe which is communicated with the outside and is used for discharging treated wastewater, one end of the water passing pipe is communicated with the to-be-treated chamber, and the other end of the water passing pipe penetrates through the heat exchange chamber and is communicated with the upper cylinder body. The device and the system for treating the high-salinity wastewater by utilizing the waste heat of the sintering flue gas, disclosed by the utility model, are not in direct contact with a heating medium, so that the conditions that ammonia nitrogen is taken away by steam and is polluted by other metal substances are avoided, subsequent treatment processes further generated in the treatment of the high-salinity wastewater are reduced, and the treatment efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment in the metallurgical industry, and in particular to a device and a system for treating high-salt wastewater by utilizing residual heat from sintering flue gas. Background Art

[0002] The sintered ash and blast furnace bag ash from steel plants are high-salt solid wastes. Alkali and chlorine metals are often removed by water washing. After water washing and leaching, the high-salt solid waste is dehydrated and the sintered ash is returned to sintering, while the blast furnace bag ash needs to be further processed by a rotary kiln. In the process of water washing and leaching of high-salt solid waste, the high-salt leached wastewater is pre-treated and then evaporated for salt precipitation.

[0003] In the related art, the washing water of sintered ash and blast furnace bag ash contains a certain concentration of ammonia nitrogen. Ordinary evaporators use high-temperature steam or high-temperature flue gas to heat the liquid for evaporation. The direct contact of high-temperature steam and flue gas with high-salt wastewater will cause a series of problems. Steam directly contacts the high-salt wastewater to be treated, which is easy to carry away the ammonia in the wastewater, which is not conducive to the collection of ammonia nitrogen. Moreover, it will cause the steam to be contaminated, and it will need to be treated later, increasing the difficulty and cost of treatment. The high-salt wastewater itself contains other metal substances in the high-temperature flue gas, which will further pollute it, making it more difficult to treat.

[0004] In view of this, it is necessary to propose a device and system for treating high-salt wastewater by utilizing the waste heat of sintering flue gas to solve the above-mentioned defects. Utility Model Content

[0005] The main purpose of the utility model is to provide a device and system for treating high-salt wastewater by utilizing the residual heat of sintering flue gas, aiming to solve the problem of low evaporation efficiency caused by direct contact of steam from the existing evaporator with high-salt wastewater.

[0006] To achieve the above-mentioned purpose, the utility model provides a device for treating high-salt wastewater by utilizing the residual heat of sintering flue gas, comprising an upper cylinder and a lower cylinder assembled with the upper cylinder, wherein the chamber of the lower cylinder is divided into mutually independent chambers to be treated, heat exchange chambers and treated chambers, a high-temperature medium is introduced into the heat exchange chamber, wastewater to be treated is introduced into the chamber to be treated, the treated chamber is connected with the upper cylinder, a water pipe is arranged in the heat exchange chamber, the treated chamber is connected with a drainage main pipe connected with the outside world for discharging the treated wastewater, one end of the water pipe is connected with the chamber to be treated, and the other end passes through the heat exchange chamber and is connected with the upper cylinder.

[0007] Preferably, the upper opening of the drainage main pipe is arranged upward in an expanding manner, and the bottom end passes through the treated chamber from the treated chamber to the outside.

[0008] Preferably, a transverse baffle and a vertical baffle are fixedly connected to the inner wall of the processed chamber, and an air flow channel is formed between the transverse baffle and the vertical baffle.

[0009] Preferably, there are multiple water pipes, and the multiple water pipes are vertically spaced apart.

[0010] Preferably, at least two liquid distribution plates spaced apart from each other are fixedly connected to the inner wall of the treatment chamber, each of the liquid distribution plates is provided with a plurality of liquid outlet holes, and the inlet of the wastewater to be treated is located between two adjacent liquid distribution plates.

[0011] Preferably, there are two liquid evenly distributing plates, and the two liquid evenly distributing plates are arranged in parallel.

[0012] Preferably, the high temperature medium is high temperature flue gas or high temperature steam.

[0013] Preferably, it also includes a condensate discharge pipe, the inlet end of the condensate discharge pipe is connected to the heat exchange chamber, and the outlet end of the condensate discharge pipe is connected to an external device.

[0014] Preferably, it further comprises a drainage branch pipe, to which an on-off valve is connected, the inlet end of the drainage branch pipe is connected to the treated chamber, and the outlet end thereof is connected to the water pipe.

[0015] The utility model also provides a system for treating high-salt wastewater by utilizing the residual heat of sintering flue gas, comprising a plurality of devices for treating high-salt wastewater by preheating the sintering flue gas, wherein the plurality of devices for treating high-salt wastewater by preheating the sintering flue gas are connected in sequence, and the steam outlet of the first device for treating high-salt wastewater by preheating the sintering flue gas is connected to the inlet of the high-temperature medium of the second device for treating high-salt wastewater by preheating the sintering flue gas.

[0016] Compared with the prior art, the device and system for treating high-salt wastewater by utilizing the residual heat of sintering flue gas provided by the utility model has the following beneficial effects:

[0017] The device and system for treating high-salt wastewater by using the residual heat of sintering flue gas provided by the utility model are provided with a plurality of chambers. After the high-salt wastewater enters the chamber to be treated, it flows into the treated chamber through the water pipe. Since the water pipe is arranged in the heat exchange chamber, the high-salt wastewater in the pipe is heated by the heat exchange chamber to evaporate water during the flow. During the treatment process, the high-salt wastewater is in the pipeline and does not directly contact the heating medium, and ammonia nitrogen will not be carried away by steam, nor will it be contaminated by other metal substances. The subsequent treatment process generated by the high-salt wastewater during the treatment is reduced, and the treatment efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 A longitudinal cross-sectional view of a device for treating high-salt wastewater using residual heat from sintering flue gas provided by the utility model;

[0020] Figure 2 for Figure 1 A transverse cross-sectional view of a device for treating high-salinity wastewater using residual heat from sintering flue gas;

[0021] Figure 3 This is a schematic diagram of the structure of a system for treating high-salt wastewater using residual heat from sintering flue gas provided by the utility model.

[0022] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0027] See also Figure 1 The utility model provides a device for treating high-salt wastewater by using the waste heat of sintering flue gas. The device 100 for treating high-salt wastewater by using the waste heat of sintering flue gas comprises an upper cylinder 1 and a lower cylinder 2 assembled with the upper cylinder 1. Flanges 3 are installed on the upper cylinder 1 and the lower cylinder 2, and the two flanges 3 are fixedly connected by bolts.

[0028] An upper head 4 is installed on the top of the upper cylinder 1, and a steam outlet 6 is provided on the upper head 4. A plurality of observation holes 7 and inspection ports 9 are provided on the cylinder body for observing the internal operation and later maintenance. Pressure detection sensors are installed on both the upper cylinder 1 and the lower cylinder 2 to detect the pressure of the high-temperature medium in the cylinder. Pressure detection ports 8 are provided on the upper cylinder 1 and the lower cylinder 2 to facilitate the monitoring of the high-temperature medium pressure.

[0029] The lower cylinder 2 is a heat exchange and heating wastewater area. The lower end of the cylinder body of the lower cylinder 2 is closed, the upper end is open and connected to the cylinder body of the upper cylinder section, and the lower end is sealed with a lower head 5. The chamber of the lower cylinder 2 is divided into a mutually independent chamber 21 to be treated, a heat exchange chamber 22 and a treated chamber 23. A high-temperature medium is introduced into the heat exchange chamber 22. The chamber 21 to be treated is a cavity formed by the lower head 5 and the cylinder body of the lower cylinder 2. The chamber 21 to be treated is introduced into the wastewater to be treated. The treated chamber 23 is connected to the upper cylinder 1. The treated chamber 23 is a space formed in the center of the lower cylinder 2, with an open upper end and a closed lower end. A water pipe 24 is provided in the heat exchange chamber 22, and the treated chamber 23 is connected to a drainage pipe 25 connected to the outside for discharging the treated wastewater. One end of the water pipe 24 is connected to the chamber to be treated 21, and the other end passes through the heat exchange chamber 22 and is connected to the upper cylinder 1. The lower cylinder 2 is connected with a water inlet pipe for high-salt wastewater, which passes the wastewater into the chamber to be treated 21 and flows to the treated chamber 23 through the water pipe 24. Since the water pipe 24 is located in the heat exchange chamber 22, the high-salt wastewater is heated by the high-temperature medium in the heat exchange chamber 22 during the flow, and the water contained in the high-salt wastewater is evaporated and enters the upper cylinder 1. After entering the treated chamber 23, it is discharged by the drainage main pipe 25, and the low-temperature medium after heat exchange is discharged from the air outlet 20. Therefore, the high-salt wastewater can be evaporated after being heated in the heat exchange chamber 22, thereby reducing the water content of the high-salt wastewater. During the treatment process, the high-salt wastewater is in the pipeline and does not directly contact the heating medium, and ammonia nitrogen will not be carried away by steam, nor will it be contaminated by other metal substances. The subsequent treatment process generated by the high-salt wastewater during treatment is reduced, and the treatment efficiency is higher.

[0030] like Figure 1 As shown, the upper opening of the drainage main pipe 25 is arranged upward in an expanded manner, and the bottom end passes through the treated chamber 23 to the outside through the chamber to be treated 21. The top of the drainage main pipe 25 is in the form of a funnel, and the inlet is the largest, so that the high-salt wastewater entering the treated chamber 23 quickly enters the drainage main pipe 25, and the drainage speed has been improved.

[0031] Specifically, the high temperature medium is high temperature flue gas or high temperature steam. Among them, high temperature flue gas is generated during sintering, and its temperature is high. Generally, sintering flue gas needs to be cooled before being discharged into the atmosphere. Using high temperature flue gas as a heating medium can greatly improve energy utilization. High temperature steam is steam generated by the evaporator.

[0032] like Figure 1 and Figure 2As shown, a transverse baffle 26 and a vertical baffle 27 are fixedly connected to the inner wall of the treated chamber 23, and a plurality of air flow channels are formed between the transverse baffle 26 and the vertical baffle 27. Each air flow channel allows air to flow through the water pipe 24 from all directions, thereby increasing the heat exchange efficiency and enabling the high-temperature gas to heat the high-salt wastewater more efficiently.

[0033] There are multiple water pipes 24 , which are vertically spaced apart. It can be understood that increasing the number of water pipes 24 is used to increase the number of water pipes 24 to speed up the heat exchange rate.

[0034] At least two liquid distribution plates 28 spaced apart from each other are fixedly connected to the inner wall of the treatment chamber 21, and each of the liquid distribution plates 28 is provided with a plurality of liquid outlet holes. The inlet of the wastewater to be treated is located between two adjacent liquid distribution plates 28. The wastewater to be treated that enters the treatment chamber 21 from the inlet flows between the two liquid distribution plates 28 and is discharged from each of the liquid outlet holes, thereby dispersing the wastewater entering the chamber and quickly entering the water pipe 24.

[0035] Preferably, there are two liquid evenly distributing plates 28, and the two liquid evenly distributing plates 28 are arranged in parallel. The inlet is located between the two liquid evenly distributing plates 28, and after entering the two liquid evenly distributing plates 28, the liquid is dispersed out through the liquid outlet holes.

[0036] In another embodiment, the device for treating high-salt wastewater using the waste heat of sintering flue gas also includes a condensate discharge pipe 29, the inlet end of the condensate discharge pipe 29 is connected to the heat exchange chamber 22, and the outlet end thereof passes through the liquid uniform distribution plate 28 and is connected to an external device to discharge the condensate generated in the heat exchange chamber 22.

[0037] In another preferred embodiment, the device 100 for treating high-salt wastewater using residual heat from sintering flue gas further includes a drainage branch pipe 30, to which an on-off valve 31 is connected for controlling the on-off of the drainage branch pipe, the inlet end of the drainage branch pipe 30 is connected to the treated chamber 23, and the outlet end thereof is connected to the water pipe 24 through the liquid uniform distribution plate 28, for draining the high-salt wastewater accumulated in the equipment during maintenance. Specifically, the on-off valve is a solenoid valve.

[0038] like Figure 3As shown, the utility model also provides a system for treating high-salt wastewater using the residual heat of sintering flue gas. The system for treating high-salt wastewater using the residual heat of sintering flue gas includes a plurality of devices 100 for treating high-salt wastewater using sintering flue gas preheating, which are connected in sequence. The steam outlet 6 of the previous device for treating high-salt wastewater using sintering flue gas preheating is connected to the inlet of the high-temperature medium of the next device for treating high-salt wastewater using sintering flue gas preheating. In this embodiment, the high-temperature medium is high-temperature steam, and the steam is discharged from the steam outlet after heat exchange, and then enters the next device to continue circulation, so that the remaining high-temperature steam in the evaporation process can also be utilized, which greatly improves the efficiency of energy utilization.

[0039] The device and system for treating high-salt wastewater by using the residual heat of sintering flue gas provided by the utility model are provided with a plurality of chambers. After the high-salt wastewater enters the chamber to be treated, it flows into the treated chamber through the water pipe. Since the water pipe is arranged in the heat exchange chamber, the high-salt wastewater in the pipe is heated by the heat exchange chamber to evaporate water during the flow. During the treatment process, the high-salt wastewater is in the pipeline and does not directly contact the heating medium, and ammonia nitrogen will not be taken away by steam, nor will it be contaminated by other metal substances. The subsequent treatment process further generated during the treatment of the high-salt wastewater is reduced, and the treatment efficiency is higher.

[0040] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for treating high-salt wastewater using waste heat from sintering flue gas, characterized in that: The invention comprises an upper cylinder and a lower cylinder assembled with the upper cylinder, wherein the chamber of the lower cylinder is divided into a chamber to be treated, a heat exchange chamber and a treated chamber which are independent of each other, a high-temperature medium is introduced into the heat exchange chamber, wastewater to be treated is introduced into the chamber to be treated, the treated chamber is connected with the upper cylinder, a water pipe is arranged in the heat exchange chamber, the treated chamber is connected with a drainage pipe which is connected with the outside world for discharging the treated wastewater, one end of the water pipe is connected with the chamber to be treated, and the other end passes through the heat exchange chamber and is connected with the upper cylinder.

2. The device for treating high-salt wastewater by utilizing sintering flue gas waste heat according to claim 1, characterized in that: The upper opening of the drainage main pipe is arranged upward in an expanding manner, and the bottom end thereof passes through the treated chamber and the chamber to be treated to the outside.

3. The device for treating high-salt wastewater by utilizing sintering flue gas waste heat according to claim 1, characterized in that: A transverse baffle and a vertical baffle are fixedly connected to the inner wall of the processed chamber, and an air flow channel is formed between the transverse baffle and the vertical baffle.

4. The device for treating high-salt wastewater by utilizing sintering flue gas waste heat according to claim 1, characterized in that: There are multiple water pipes, and the multiple water pipes are vertically spaced apart.

5. The device for treating high-salt wastewater by utilizing sintering flue gas waste heat according to claim 1, characterized in that: At least two liquid distribution plates spaced apart from each other are fixedly connected to the inner wall of the treatment chamber, each of the liquid distribution plates is provided with a plurality of liquid outlet holes, and the inlet of the wastewater to be treated is located between two adjacent liquid distribution plates.

6. The device for treating high-salt wastewater by utilizing sintering flue gas waste heat according to claim 5, characterized in that: There are two liquid evenly distributing plates, and the two liquid evenly distributing plates are arranged in parallel.

7. The device for treating high-salinity wastewater by utilizing sintering flue gas waste heat according to claim 1, characterized in that: The high temperature medium is high temperature flue gas or high temperature steam.

8. The device for treating high-salinity wastewater by utilizing residual heat from sintering flue gas according to any one of claims 1 to 7, characterized in that: It also includes a condensate discharge pipe, the inlet end of which is connected to the heat exchange chamber, and the outlet end of which is connected to an external device.

9. The device for treating high-salinity wastewater by utilizing residual heat from sintering flue gas according to any one of claims 1 to 7, characterized in that: It also includes a drainage branch pipe, which is connected to an on-off valve. The inlet end of the drainage branch pipe is connected to the treated chamber, and the outlet end is connected to the water pipe.

10. A system for treating high-salinity wastewater using waste heat from sintering flue gas, characterized in that: It comprises a plurality of devices for preheating high-salt wastewater using sintering flue gas as described in any one of claims 1 to 9, wherein the plurality of devices for preheating high-salt wastewater using sintering flue gas are connected in sequence, and the steam outlet of the previous device for preheating high-salt wastewater using sintering flue gas is connected to the inlet of the high-temperature medium of the next device for preheating high-salt wastewater using sintering flue gas.

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