A system for synergistically purifying carbon product baking flue gas and desulfurization wastewater

Abstract

The utility model discloses a kind of carbon product roasting flue gas and desulfurization wastewater's collaborative purification system, including wastewater supply and evaporation unit, crystalline salt adsorption purification unit and flue gas supply unit connected by pipeline sequentially. The wastewater supply and evaporation unit includes wastewater buffer box, full-automatic spraying device and full evaporation spraying cooling tower;The crystalline salt adsorption purification unit includes adsorption reactor, adsorbent powder bin and adsorption purification dust collector;The flue gas supply unit includes main flue, high-temperature flue gas pipeline, dust-containing flue gas pipeline and purified flue gas pipeline.The utility model is integrated by structure, evaporates desulfurization wastewater by roasting flue gas waste heat, and utilizes adsorbent to cooperate with capture crystalline salt and asphalt smoke, realizes waste treatment with waste, wastewater zero discharge and multiple pollutants integrated purification, system structure is compact, and operating cost is low.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater treatment technology, specifically to a synergistic purification system for carbon product roasting flue gas and desulfurization wastewater. Background Technology

[0002] In recent years, most domestic carbon product manufacturing enterprises have equipped their roasting flue gas, calcination flue gas, and graphitization flue gas purification systems with desulfurization systems. Currently, newly built and planned desulfurization systems generally adopt calcium-based wet desulfurization technology. The use of this technology inevitably generates a certain amount of desulfurization wastewater.

[0003] Currently, conventional desulfurization systems typically treat wastewater from wet desulfurization using only simple physical pretreatment processes such as sedimentation, filtration, flotation, and neutralization via their associated water treatment systems. While this treatment removes most solid particles, the wastewater still contains significant amounts of dissolved inorganic chlorides, heavy metals, and small amounts of tar. Therefore, neither factory-built wastewater treatment plants nor centralized wastewater treatment plants in industrial parks typically accept this complex wastewater. Long-term use of such wastewater for road or land spraying can cause severe soil salinization, hindering vegetation growth. Furthermore, the seepage of harmful components into the ground can lead to secondary water pollution, posing significant environmental risks. For carbon product manufacturers, the characteristic pollutant in their roasting flue gas—asphalt fumes (composed of tar droplets)—easily accumulates in the circulating slurry during desulfurization. If not properly treated, this can easily lead to "poisoning" of the desulfurization slurry, affecting desulfurization efficiency, and can also cause tar contamination in the byproduct desulfurization gypsum, resulting in a decline in quality. These problems will eventually lead to operational failures in the desulfurization system and create new sources of secondary pollution.

[0004] Therefore, developing equipment that can efficiently treat desulfurization wastewater and simultaneously solve the problem of asphalt fume enrichment, thus ensuring the healthy and stable operation of the environmental protection system of carbon production enterprises, has become an urgent technical challenge in this field. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model aims to solve the technical problems of difficult-to-treat desulfurization wastewater, which easily causes secondary pollution, and the complex and costly systems resulting from the separate treatment of asphalt fumes and wastewater crystallized salts in roasting flue gas. It provides a system device capable of synergistically, efficiently, and integrally purifying both.

[0006] To achieve the above technical objectives, the following technical solutions were adopted: This utility model provides a synergistic purification system for carbon product roasting flue gas and desulfurization wastewater, including a wastewater supply and evaporation unit, a crystallization salt adsorption purification unit and a flue gas supply unit. The wastewater supply and evaporation unit includes a wastewater buffer tank, a fully automatic spray device, and a fully evaporative spray cooling tower; the outlet of the wastewater buffer tank is connected to the inlet of the fully automatic spray device; the outlet of the fully automatic spray device is connected to at least one atomizing nozzle installed on the upper part of the fully evaporative spray cooling tower through a wastewater pipe. The crystalline salt adsorption and purification unit includes an adsorption reactor, an adsorbent powder silo, and an adsorption purification dust collector; the adsorbent powder silo is connected to the adsorption reactor via an adsorbent conveying pipeline; the flue gas outlet of the adsorption reactor is connected to the flue gas inlet of the adsorption purification dust collector. The flue gas supply unit includes a main flue; the main flue is connected to the flue gas inlet of the total evaporation spray cooling tower through a high-temperature flue gas pipe; the flue gas outlet of the total evaporation spray cooling tower is connected to the flue gas inlet of the adsorption reactor through a dust-laden flue gas pipe; the flue gas outlet of the adsorption purification dust collector is connected to the desulfurization system through a purified flue gas pipe and an exhaust fan.

[0007] Furthermore, the high-temperature flue gas duct is equipped with a temperature measuring instrument one for monitoring the initial temperature of the flue gas; the dust-laden flue gas duct is equipped with a temperature measuring instrument two for monitoring the temperature of the flue gas after evaporation and crystallization.

[0008] Furthermore, the wastewater pipeline is equipped with a flow meter for real-time monitoring of the wastewater spray volume.

[0009] Furthermore, an adjustable feeding device is provided at the outlet of the adsorbent powder silo.

[0010] Furthermore, the adsorption and purification dust collector is a bag filter.

[0011] Furthermore, the bottom of the adsorption purification dust collector is provided with a hopper for collecting the mixed particles of adsorbent and crystalline salt.

[0012] Furthermore, the adsorbent stored in the adsorbent powder silo is one or more of alumina, carbon powder, lime, or fly ash; the adsorbent particle size is greater than 100 micrometers, and it has a microporous structure and a large specific surface area.

[0013] Compared with existing technologies, this utility model provides a synergistic purification system for carbon product roasting flue gas and desulfurization wastewater. It has the following significant beneficial effects: 1. Structural integration and efficient collaboration: It creatively utilizes the waste heat of roasting flue gas to evaporate and treat desulfurization wastewater without the need for an additional heat source, realizing "waste treatment with waste". At the same time, the wastewater evaporation system is used as a flue gas cooling system, creating favorable conditions for subsequent purification. The system has a high degree of integration and low operating costs.

[0014] 2. Achieving zero wastewater discharge: Through the structure of the full evaporation spray cooling tower, the water in the wastewater is returned to the desulfurization system in the form of steam for recycling, and the dissolved solids are completely precipitated, achieving zero liquid discharge of wastewater and no secondary pollution.

[0015] 3. Innovative solution to the problem of capturing crystalline salt: Addressing the pain point that submicron-sized crystalline salt generated by evaporation is difficult to remove directly, the structure of an adsorption reactor, adsorbent powder silo, and bag filter is combined to adsorb the crystalline salt with adsorbent, causing it to "grow" into easily captured particles, thus cleverly solving the technical bottleneck of efficient capture.

[0016] 4. Achieve synergistic purification of multiple pollutants: This system achieves integrated synergistic treatment of flue gas (cooling), wastewater (evaporation), crystalline salt (adsorption), and asphalt fumes (adsorption). One system solves multiple environmental problems, maximizing investment and operational benefits. Attached Figure Description

[0017] The present invention will now be described in conjunction with the accompanying drawings.

[0018] Figure 1 This is a process flow diagram of the system of this utility model.

[0019] In the diagram: 1-High-temperature flue gas duct; 21-Temperature measuring instrument one; 22-Temperature measuring instrument two; 3-Fully evaporative spray cooling tower; 4-Wastewater buffer tank; 5-Fully automatic spray device; 6-Flow detection instrument; 7-Wastewater duct; 8-Atomizing nozzle; 9-Dust-laden flue gas duct; 10-Adsorption reactor; 11-Adsorbent powder silo; 12-Adjustable feeding device; 13-Adsorbent conveying duct; 14-Adsorption purification dust collector; 15-Material bin; 16-Purified flue gas duct; 17-Exhaust fan; 18-Desulfurization system. Detailed Implementation

[0020] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. The described embodiments are merely some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown, the present invention provides a synergistic purification system for carbon product roasting flue gas and desulfurization wastewater, comprising a wastewater supply and evaporation unit, a crystallization salt adsorption and purification unit, and a flue gas supply unit connected in sequence.

[0022] The core function of the wastewater supply and evaporation unit is to achieve atomization, evaporation, and crystallization of wastewater. It includes a wastewater buffer tank 4, a fully automatic spray device 5, and a full-evaporation spray cooling tower 3. Desulfurization wastewater from the carbon product wet desulfurization system, after pretreatment, first enters the wastewater buffer tank 4 for temporary storage. Subsequently, the wastewater is transported by the fully automatic spray device 5 through wastewater pipe 7 to the atomizing nozzles 8 located at the top of the full-evaporation spray cooling tower 3, where it is atomized into fine droplets and sprayed into the tower. Furthermore, a flow meter 6 is integrated into the wastewater pipe 7 for real-time monitoring of the wastewater flow rate.

[0023] The flue gas supply unit is responsible for providing the heat source and guiding the flow of flue gas. The main flue gas duct from the roasting furnace is connected to the flue gas inlet of the total evaporation spray cooling tower 3 via a high-temperature flue gas duct 1. A temperature measuring instrument 21 is installed on the high-temperature flue gas duct 1 to monitor the initial temperature of the flue gas. Inside the total evaporation spray cooling tower 3, the high-temperature flue gas directly contacts and exchanges heat with the atomized wastewater. The wastewater evaporates and crystallizes, and the flue gas itself is cooled. The cooled flue gas, carrying water vapor and micron-sized crystalline salt particles, enters the next unit through the dust-laden flue gas duct 9. A temperature measuring instrument 22 is installed on the dust-laden flue gas duct 9 to monitor the temperature of the flue gas after evaporation and crystallization.

[0024] The core function of the crystalline salt adsorption and purification unit is to achieve efficient synergistic capture of crystalline salt and asphalt fumes. This unit consists of an adsorption reactor 10, an adsorbent powder silo 11, and an adsorption purification dust collector 14. Flue gas from the dust-laden flue gas duct 9 first enters the adsorption reactor 10. Simultaneously, the adsorbent stored in the adsorbent powder silo 11 (one or more of alumina, carbon powder, lime, or fly ash; particle size greater than 100 micrometers, with a microporous structure and large specific surface area) is quantitatively controlled by an adjustable feeding device 12 at its outlet and added to the adsorption reactor 10 via the adsorbent conveying pipe 13. Inside the adsorption reactor 10, the adsorbent and dust-laden flue gas are thoroughly mixed, adsorbing and capturing micron-sized crystalline salt particles, and simultaneously removing asphalt fumes from the flue gas. Subsequently, the flue gas carrying the adsorbent particles enters the adsorption purification dust collector 14 for gas-solid separation. This dust collector is a bag filter, and the captured adsorbent and crystalline salt mixed particles fall into a hopper 15 at the bottom of the dust collector.

[0025] Finally, the purified flue gas is sent to the downstream desulfurization system 18 for treatment and then discharged into the atmosphere after being drawn in by the exhaust fan 17 through the purified flue gas pipeline 16 of the flue gas supply unit.

[0026] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0027] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0028] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A synergistic purification system for carbon product roasting flue gas and desulfurization wastewater, characterized in that: It includes a wastewater supply and evaporation unit, a crystallization salt adsorption and purification unit, and a flue gas supply unit; The wastewater supply and evaporation unit includes a wastewater buffer tank (4), a fully automatic spray device (5), and a fully evaporative spray cooling tower (3); the outlet of the wastewater buffer tank (4) is connected to the inlet of the fully automatic spray device (5); the outlet of the fully automatic spray device (5) is connected to at least one atomizing nozzle (8) located on the upper part of the fully evaporative spray cooling tower (3) through a wastewater pipe (7). The crystallized salt adsorption and purification unit includes an adsorption reactor (10), an adsorbent powder silo (11), and an adsorption purification dust collector (14); the adsorbent powder silo (11) is connected to the adsorption reactor (10) through an adsorbent conveying pipe (13); the flue gas outlet of the adsorption reactor (10) is connected to the flue gas inlet of the adsorption purification dust collector (14). The flue gas supply unit includes a main flue; the main flue is connected to the flue gas inlet of the total evaporation spray cooling tower (3) through a high-temperature flue gas pipe (1); the flue gas outlet of the total evaporation spray cooling tower (3) is connected to the flue gas inlet of the adsorption reactor (10) through a dust-laden flue gas pipe (9); the flue gas outlet of the adsorption purification dust collector (14) is connected to the desulfurization system (18) through a purified flue gas pipe (16) and a flue gas exhaust fan (17).

2. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 1, characterized in that: The high-temperature flue gas duct (1) is equipped with a temperature measuring instrument (21) for monitoring the initial temperature of the flue gas; the dust-laden flue gas duct (9) is equipped with a temperature measuring instrument (22) for monitoring the temperature of the flue gas after evaporation and crystallization.

3. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 1, characterized in that: The wastewater pipeline (7) is equipped with a flow meter (6) for real-time monitoring of the wastewater spray volume.

4. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 1, characterized in that: An adjustable feeding device (12) is provided at the outlet of the adsorbent powder silo (11).

5. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 1, characterized in that: The adsorption purification dust collector (14) is a bag filter.

6. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 5, characterized in that: The bottom of the adsorption purification dust collector (14) is provided with a material box (15) for collecting the mixed particles of adsorbent and crystalline salt.

7. The synergistic purification system for carbon product roasting flue gas and desulfurization wastewater according to claim 1, characterized in that: The adsorbent stored in the adsorbent powder silo (11) is one or more of alumina, carbon powder, lime or fly ash; the adsorbent particle size is greater than 100 micrometers, and it has a microporous structure and a large specific surface area.

Images