Sewage tail liquid drying system

Abstract

The utility model discloses a sewage tail liquid drying system, and relates to the technical field of high-concentration wastewater treatment, an inlet of a drying device is used for feeding tail liquid, an atomization device is arranged in the drying device, an outlet of the drying device is communicated with an inlet of a dust removal device, an outlet of the dust removal device is communicated with an inlet of a multi-stage waste heat utilization device, one outlet of the multi-stage waste heat utilization device is communicated with the outside, the other outlet of the dust removal device is communicated with the outside, the other inlet of the multi-stage waste heat utilization device is communicated with external cold air, one outlet of the multi-stage waste heat utilization device is communicated with the outside, the other outlet of the multi-stage waste heat utilization device is communicated with an inlet of the heating device, and an outlet of the heating device is communicated with the other inlet of the drying device; an outlet of the atomization device communicates with the interior of the drying device. According to the utility model, waste heat can be utilized, the treatment cost is reduced, and high-concentration tail liquid can be quickly dried.

Description

Technical Field

[0001] The utility model relates to the technical field of high-concentration wastewater treatment, in particular to a sewage tail liquid drying system. Background Art

[0002] High-concentration sewage is widely distributed in a wide range of industries and has a large amount of water. In addition, its water quality characteristics such as high salt content, high COD, and heavy metals have a significant impact on the ecological environment. The pollutants in high-concentration sewage are diverse, and coordinated treatment is difficult. The various coupled processes restrain each other, which has always been the pain point and difficulty restricting the recycling and reuse of sewage and wastewater.

[0003] In response to environmental protection policies, the high-concentration wastewater zero-discharge process has basically formed a technical chain of "pretreatment + concentration reduction + evaporation crystallization". The complex process flow leads to the restraining influence of upstream equipment on subsequent links, the overall operation coordination is difficult, and the equipment of each unit is frequently overhauled and maintained, which seriously restricts the stable operation of the entire process; at the same time, the high investment and operation costs and cumbersome on-site management limit its further promotion and application. Utility Model Content

[0004] The utility model aims to provide a sewage tail liquid drying system to solve the problems existing in the above-mentioned prior art, utilize the waste heat, reduce the processing cost, and realize the rapid drying of high-concentration tail liquid.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a sewage tail liquid drying system, comprising a drying device, a dust removal device, a multi-stage waste heat utilization device and a heating device which are connected end to end in sequence, an inlet of the drying device is used for the introduction of tail liquid, an atomizing device is arranged in the drying device, an outlet of the drying device is connected to the inlet of the dust removal device, an outlet of the dust removal device is connected to an inlet of the multi-stage waste heat utilization device, another outlet of the dust removal device is connected to the outside, another inlet of the multi-stage waste heat utilization device is connected to external cold air, and the air discharged from the dust removal device heats the external cold air, an outlet of the multi-stage waste heat utilization device is connected to the outside, and the air discharged from the dust removal device is discharged to the outside after heat exchange, another outlet of the multi-stage waste heat utilization device is connected to the inlet of the heating device, and the heated external cold air is introduced into the heating device, the outlet of the heating device is connected to another inlet of the drying device, and the outlet of the atomizing device is connected to the inside of the drying device.

[0007] Preferably, the drying device is a drying tower, and the tail liquid is transported into the drying tower through a tail liquid inlet pipe at the inlet of the drying tower.

[0008] Preferably, the dust removal device is a dust collector, and a finished product packaging device is connected to the outlet of the dust collector for communicating with the outside world. The dust collector can intercept the crystallized salt produced in the drying device, and package the intercepted crystallized salt for external delivery through the finished product packaging device.

[0009] Preferably, the drying device is connected to the dust removal device via an air outlet duct.

[0010] Preferably, the multi-stage waste heat utilization device includes a first-level waste heat utilization device and a second-level waste heat utilization device, an inlet of the first-level waste heat utilization device is connected to the outlet of the dust removal device, another inlet of the first-level waste heat utilization device is connected to external cold air, an outlet of the first-level waste heat utilization device is connected to the outside, and another outlet of the first-level waste heat utilization device is connected to an inlet of the second-level waste heat utilization device, the air exhausted by the dust removal device can exchange heat with the external cold air in the first-level waste heat utilization device, and the air exhausted by the dust removal device after heat exchange is discharged to the outside, the external cold air forms a first hot air after heat exchange in the first-level waste heat utilization device, and the first hot air can enter the second-level waste heat utilization device; another inlet of the second-level waste heat utilization device is connected to the plant exhaust gas source, the first hot gas can be preheated by the plant exhaust gas source in the second-level waste heat utilization device, and the outlet of the second-level waste heat utilization device is connected to the inlet of the heating device.

[0011] Preferably, the first-stage waste heat utilization device is connected to an air post-processing device at an outlet that is not connected to the second-stage waste heat utilization device.

[0012] Preferably, the heating device comprises an electric heating furnace or a pipeline heater.

[0013] Preferably, the outlet of the heating device is connected to the inlet of the atomizing device via an air inlet flue, and the air inlet flue is used to tangentially pass the hot air exhausted from the heating device into the atomizing device.

[0014] Preferably, the atomizing device is arranged close to the upper end of the drying device, and a fluid nozzle is provided on the atomizing device.

[0015] Preferably, the dust removal device is used to connect the outlet to the outside to a finished product packaging device, and the finished product packaging device is used to package the dried finished products.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] 1. The sewage tail liquid drying system provided by the utility model uses a two-stage waste heat utilization system, fully utilizes low-value heat sources, realizes low-cost preheating of air, and then utilizes a heating device to heat the preheated air into high-temperature hot air, and utilizes an atomizing device to disperse the high-concentration tail liquid into small-particle atomized droplets. In the drying device, the atomized droplets and the high-temperature hot air are fully transferred for mass and heat, and the formed crystalline salt enters the dust removal device through the flue gas outlet pipe together with the hot flue gas for separation and then merges into the finished product packaging device, thereby finally realizing low-cost drying of high-concentration tail liquid.

[0018] 2. The sewage tail liquid drying system provided by the utility model has an atomizing device in the drying device, in which a single-fluid, double-fluid or three-fluid atomizing spray gun can be installed according to the suspended matter index of the incoming water quality and the incoming water volume, and the operation mode can be adjusted to achieve sufficient atomization of the droplets, thus avoiding the phenomenon of droplets sticking to the wall when the atomizing treatment is not operated properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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 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 these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the sewage tail liquid drying system in the utility model;

[0021] In the figure: 1-drying device, 2-air outlet pipe, 3-dust removal device, 4-finished product packaging device, 5-primary waste heat utilization device, 6-secondary waste heat utilization device, 7-heating device, 8-air inlet flue, 9-tail liquid inlet pipe, 10-atomization device, 11-air post-treatment pipe, 12-cold air inlet pipe, 13-exhaust gas pipe. DETAILED DESCRIPTION

[0022] 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 in 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.

[0023] The utility model aims to provide a sewage tail liquid drying system to solve the problems existing in the prior art, to utilize waste heat, to reduce processing costs, and to achieve rapid drying of high-concentration tail liquid.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 As shown, the present embodiment provides a sewage tail liquid drying system, comprising a drying device 1, a dust removal device 3, a multi-stage waste heat utilization device and a heating device 7 which are connected end to end in sequence, an inlet of the drying device 1 is used for the introduction of tail liquid to centrally treat the tail liquid, an atomizing device 10 is arranged in the drying device 1, the atomizing device 10 is used to disperse the high-concentration tail liquid in the drying device 1 into small-particle atomized droplets, the small-particle atomized droplets are fully mass-transferred and heat-transferred with the high-temperature hot air in the drying device 1 to be dried into crystalline salt, the outlet of the drying device 1 is connected to the inlet of the dust removal device 3, one outlet of the dust removal device 3 is connected to an inlet of the multi-stage waste heat utilization device, the other outlet of the dust removal device 3 is connected to the outside, and the dust removal device 3 can The crystallized salt is collected and discharged to the outside, and the air discharged from the drying device 1 passes through the dust removal device 3 and then enters the multi-stage waste heat utilization device for heat exchange. Another inlet of the multi-stage waste heat utilization device is connected to the external cold air, and the air discharged from the dust removal device 3 heats the external cold air. One outlet of the multi-stage waste heat utilization device is connected to the outside, and the air discharged from the dust removal device 3 is discharged to the outside after heat exchange. Another outlet of the multi-stage waste heat utilization device is connected to the inlet of the heating device 7, and the heated external cold air is passed into the heating device 7. The outlet of the heating device 7 is connected to another inlet of the drying device 1, so that the hot air discharged from the heating device 7 enters the drying device 1, and the outlet of the atomization device 10 is connected to the inside of the drying device 1.

[0026] Specifically, the drying device 1 is a drying tower, and the tail liquid is transported into the drying tower through the tail liquid inlet pipe 9 at the inlet of the drying tower.

[0027] The dust removal device 3 is a dust collector, and a finished product packaging device 4 is connected to the outlet of the dust collector for communicating with the outside world. The dust collector can intercept the crystallized salt produced in the drying device 1, and package the intercepted crystallized salt through the finished product packaging device 4 for external delivery.

[0028] The drying device 1 is connected to the dust removal device 3 via an air outlet pipe 2 .

[0029] The multi-stage waste heat utilization device includes a primary waste heat utilization device 5 and a secondary waste heat utilization device 6. An inlet of the primary waste heat utilization device 5 is connected to the outlet of the dust removal device 3, and another inlet of the primary waste heat utilization device 5 is connected to external cold air. The external cold air is connected to the primary waste heat utilization device 5 through the cold air inlet pipe 12. An outlet of the primary waste heat utilization device 5 is connected to the outside world. The primary waste heat utilization device 5 can use the heat of the medium in the air outlet pipe 2 to preheat the cold air in the cold air inlet pipe 12. Another outlet of the primary waste heat utilization device 5 is connected to an inlet of the secondary waste heat utilization device 6. The temperature of the air after heat exchange by the primary waste heat utilization device 5 reaches 90°C. The air discharged from the dust removal device 3 can exchange heat with the external cold air in the first-level waste heat utilization device 5, and the air discharged from the dust removal device 3 after the heat exchange is discharged to the outside. The external cold air forms hot air after heat exchange in the first-level waste heat utilization device 5, and the hot air can enter the second-level waste heat utilization device 6; the other inlet of the second-level waste heat utilization device 6 is connected to the plant exhaust gas source. The plant exhaust gas source is low-value and low-temperature exhaust gas (temperature <165°C, pressure <0.5MPa), and the plant exhaust gas is introduced into the second-level waste heat utilization device 6 through the exhaust gas pipeline 13. The hot gas can be preheated by the plant exhaust gas source in the second-level waste heat utilization device 6, and the air temperature after heating by the second-level waste heat utilization device 6 reaches 150°C.

[0030] The outlet of the secondary waste heat utilization device 6 is connected to the inlet of the heating device 7 .

[0031] The primary waste heat utilization device 5 is arranged horizontally, and a tubular heat exchanger or a plate heat exchanger can be used.

[0032] The first-stage waste heat utilization device 5 is connected to an air post-processing device at an outlet that is not connected to the second-stage waste heat utilization device 6, so that the air after drying and heat exchange is processed by the air post-processing device and then discharged. The air post-processing devices are connected to each other through an air post-processing pipeline 11.

[0033] The heating device 7 includes an electric heating furnace or a pipeline heater. The temperature of the air heated by the heating device 7 can reach above 280°C.

[0034] The outlet of the heating device 7 is connected to the inlet of the atomizing device 10 through an air inlet flue 8. The air inlet flue 8 is used to tangentially pass the hot air exhausted from the heating device 7 into the atomizing device 10 so that the hot air can be better distributed, which is beneficial to the sufficient heat exchange between the hot air in the drying device 1 and the tail liquid wastewater, thereby improving the evaporation efficiency.

[0035] The atomizing device 10 is arranged near the upper end of the drying device 1 and is located at the top 1 / 4 of the drying device 1. The atomizing device 10 is provided with a fluid nozzle. The fluid nozzle can be a single-fluid nozzle, a double-fluid nozzle, or a three-fluid nozzle. The atomized droplet particle size is less than 80 μm. The flow direction of the medium sprayed by the atomizing device 10 is consistent with the flow direction of the medium of the air inlet flue 8.

[0036] The dust removal device 3 is used to connect the outlet to the outside world and is connected to a finished product packaging device 4, and the finished product packaging device 4 is used to package the dried finished products.

[0037] The specific working process of this embodiment is as follows:

[0038] By using a two-stage waste heat utilization device, the heat of the 135°C air at the outlet of the drying device 1 is exchanged through the first-stage waste heat utilization device 5 to heat the cold air. After passing through the first-stage waste heat utilization device 5, the cold air can be preheated from 25°C to 90°C; the heat source of the second-stage waste heat utilization device 6 is the exhaust gas in the plant area (temperature <165°C, pressure <0.5MPa). After heating the 90°C air in the second-stage waste heat utilization device 6, the 90°C air can be preheated to 150°C; the 150°C air is further heated again by the heating device 7 to finally reach a high-temperature air above 280°C; the high-temperature air is used as a heat exchange heat source, and the corresponding atomizing device 10 is selected according to the water volume of the tail liquid and the suspended matter content; the atomized wastewater is heat-exchanged with the high-temperature hot air, and the atomized droplets are evaporated after the heat exchange is completely completed, and the formed crystalline salt enters the dust removal device 3 together with the hot air and is intercepted, and is sent out through the finished product packaging device 4 to realize the resource utilization of the crystalline salt.

[0039] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A sewage tail liquid drying system, characterized in that: It comprises a drying device, a dust removal device, a multi-stage waste heat utilization device and a heating device which are connected end to end in sequence, an inlet of the drying device is used for the introduction of tail liquid, an atomizing device is arranged in the drying device, an outlet of the drying device is connected to the inlet of the dust removal device, an outlet of the dust removal device is connected to an inlet of the multi-stage waste heat utilization device, another outlet of the dust removal device is connected to the outside, another inlet of the multi-stage waste heat utilization device is connected to external cold air, and the air discharged from the dust removal device heats the external cold air, an outlet of the multi-stage waste heat utilization device is connected to the outside, and the air discharged from the dust removal device is discharged to the outside after heat exchange, another outlet of the multi-stage waste heat utilization device is connected to the inlet of the heating device, and the heated external cold air is introduced into the heating device, the outlet of the heating device is connected to another inlet of the drying device, and the outlet of the atomizing device is connected to the inside of the drying device.

2. The sewage tail liquid drying system according to claim 1, characterized in that: The drying device is a drying tower, and the tail liquid is transported into the drying tower through a tail liquid inlet pipeline at the inlet of the drying tower.

3. The sewage tail liquid drying system according to claim 1 is characterized in that: The dust removal device is a dust collector, and a finished product packaging device is connected to the outlet of the dust collector for communicating with the outside world. The dust collector can intercept the crystallized salt produced in the drying device, and the intercepted crystallized salt is packaged and sent out through the finished product packaging device.

4. The sewage tail liquid drying system according to claim 1, characterized in that: The drying device is communicated with the dust removing device through an air outlet duct.

5. The sewage tail liquid drying system according to claim 1 is characterized in that: The multi-stage waste heat utilization device includes a primary waste heat utilization device and a secondary waste heat utilization device, an inlet of the primary waste heat utilization device is connected to the outlet of the dust removal device, another inlet of the primary waste heat utilization device is connected to external cold air, an outlet of the primary waste heat utilization device is connected to the outside, another outlet of the primary waste heat utilization device is connected to an inlet of the secondary waste heat utilization device, the air discharged from the dust removal device can exchange heat with the external cold air in the primary waste heat utilization device, and the air discharged from the dust removal device after heat exchange is discharged to the outside, the external cold air forms a first hot gas after heat exchange in the primary waste heat utilization device, and the first hot gas can enter the secondary waste heat utilization device; Another inlet of the secondary waste heat utilization device is connected to the plant exhaust gas source, the first hot gas can be preheated by the plant exhaust gas source in the secondary waste heat utilization device, and the outlet of the secondary waste heat utilization device is connected to the inlet of the heating device.

6. The sewage tail liquid drying system according to claim 5, characterized in that: The first-stage waste heat utilization device is connected to an air post-processing device at an outlet that is not connected to the second-stage waste heat utilization device.

7. The sewage tail liquid drying system according to claim 1, characterized in that: The heating device comprises an electric heating furnace or a pipeline heater.

8. The sewage tail liquid drying system according to claim 1, characterized in that: The outlet of the heating device is connected to the inlet of the atomizing device through an air inlet flue, and the air inlet flue is used to tangentially pass the hot air exhausted from the heating device into the atomizing device.

9. The sewage tail liquid drying system according to claim 1, characterized in that: The atomizing device is arranged close to the upper end of the drying device, and a fluid nozzle is arranged on the atomizing device.

10. The sewage tail liquid drying system according to claim 1, characterized in that: The outlet of the dust removal device for communicating with the outside is connected to a finished product packaging device, and the finished product packaging device is used to package the dried finished products.

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