A comprehensive treatment system for chemical three wastes

Abstract

The utility model discloses a chemical three waste comprehensive treatment system, the system includes boiler, dust removal system, SCR denitration system, limestone -gypsum method desulfurization system, chimney, its characterized in that, the system still includes high temperature coal economizer, low temperature coal economizer and air preheater, high temperature coal economizer, low temperature coal economizer and air preheater install in the boiler tail flue, high temperature coal economizer is in the upstream, and its export is the smoke outlet I, low temperature coal economizer and air preheater are in the downstream, and its export is the smoke outlet II, the smoke outlet I is connected dust removal system, dust removal system is connected SCR denitration system, and SCR denitration system is connected boiler, the smoke outlet II is connected limestone -gypsum method desulfurization system, and limestone -gypsum method desulfurization system is connected chimney.

Description

Technical Field

[0001] This utility model relates to the technology for comprehensive treatment of chemical waste, specifically to a comprehensive treatment system for chemical waste. Background Technology

[0002] Due to industrial agglomeration effects or safety and environmental management requirements, chemical industries are generally concentrated in one area, forming chemical industrial parks. Therefore, these parks generate large amounts of pollutants such as waste liquid, waste gas, and waste residue, which are difficult to manage. Each chemical industrial park constructs wastewater treatment plants, waste gas treatment facilities, and solid waste disposal centers to centrally collect, treat, and monitor pollutants, achieving compliant emissions. However, many wastes in chemical industrial parks contain residual calorific value. Treating them individually would be costly and uneconomical. The synergistic treatment of these three wastes can optimize processes and technologies to achieve cascaded energy utilization and resource recycling, thereby reducing energy consumption and waste emissions, achieving energy conservation and emission reduction goals. This aligns with national requirements for green development in the chemical industry and helps promote the transformation of the chemical industry towards a low-carbon, circular economy. In particular, gasification slag, mixed alcohols and aldehydes (C8), and fuel waste gas from ammonia synthesis production all contain high residual calorific value and can be treated by incineration. The generated calorific value can be co-incinerated with waste liquid, and the excess heat can be used to generate steam for use by various equipment in the park, achieving energy conservation, emission reduction, and efficiency improvement. However, the flue gas produced by the combustion of "three wastes" has a complex composition and may contain heavy metals, organic matter, and dioxins. Fly ash needs to be treated as hazardous waste.

[0003] The traditional treatment method is a flue gas purification process that combines semi-dry method, dry injection, activated carbon injection, bag filter dust collection, wet method, and low-temperature SCR. The fly ash from this process needs to be solidified and transported off-site as hazardous waste. Flue gas heat exchangers are required before the wet method and SCR, and steam heat exchangers are required before SCR. This results in low thermal efficiency, high system corrosion risk, high initial investment cost, and high operating cost. Utility Model Content

[0004] In view of the above problems, this utility model proposes a comprehensive treatment system for chemical waste.

[0005] The technical solution of this utility model:

[0006] A comprehensive chemical waste treatment system includes a boiler, a dust removal system, an SCR denitrification system, a limestone-gypsum desulfurization system, and a chimney. The system also includes a high-temperature economizer, a low-temperature economizer, and an air preheater. The high-temperature economizer, low-temperature economizer, and air preheater are installed in the boiler's tail flue. The high-temperature economizer is upstream, with its outlet at flue gas inlet I. The low-temperature economizer and air preheater are downstream, with their outlets at flue gas inlet II. Flue gas inlet I is connected to the dust removal system, which is connected to the SCR denitrification system, which is connected to the boiler. Flue gas inlet II is connected to the limestone-gypsum desulfurization system, which is connected to the chimney.

[0007] The flue gas temperature coming out of flue gas outlet I is 300~400℃, which is within the denitrification temperature window of the high-temperature catalyst and is also above the flue gas condensation temperature; the flue gas temperature coming out of flue gas outlet II is about 160℃.

[0008] The flue gas from intake port I is dusted by the dust removal system and denitrified by the SCR denitrification system. The fly ash enters the boiler and is remelted into glass slag. The high temperature and low dust denitrification environment helps to extend the life of the high temperature catalyst, reduce the time and frequency of system maintenance, and also eliminates the need for flue gas heat exchangers and steam heaters, saving investment and operating costs.

[0009] The flue gas from intake port I is desulfurized by the limestone-gypsum desulfurization system, and the qualified flue gas is discharged through the chimney.

[0010] Further refining the above technical solution, the dust removal system is a metal filter bag dust collector; the metal filter bag dust collector is installed at the inlet of the SCR reactor in the SCR denitrification system.

[0011] Further refining the above technical solution, the metal filter bag dust collector uses a metal filter bag made of nickel-based alloy; since the dust in the flue gas has a high carbon content, the nickel-based alloy filter bag can prevent the filter bag from being damaged by dust re-ignition, and can also prevent corrosion caused by the complex composition of the flue gas.

[0012] Further refining the above technical solution, the chimney is installed at the outlet of the absorption tower in the limestone-gypsum desulfurization system; no additional tower is required.

[0013] To further refine the above, considering the high sulfur content of the flue gas in the absorption tower of the limestone-gypsum desulfurization system and the temperature dropping below the acid dew point, the absorption tower of the limestone-gypsum desulfurization system is coated with glass flakes for corrosion protection; considering the high temperature of the inlet flue of the absorption tower of the limestone-gypsum desulfurization system, the glass flakes coated on the inlet flue of the absorption tower of the limestone-gypsum desulfurization system are high-temperature resistant glass flakes.

[0014] To further refine the above technical solution, an activated carbon injection device is installed at the inlet of the metal filter bag dust collector in order to absorb heavy metals and dioxins.

[0015] The advantages of this utility model are that it has a reasonable design, simple structure, and is efficient and economical in treating flue gas generated from the combustion of chemical waste; the fly ash enters the boiler and is remelted into glass slag; the heat exchange links are reduced and the heat utilization rate is high. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a comprehensive chemical waste treatment system.

[0017] The diagram shows: 1. Boiler; 2. High-temperature economizer; 3. Low-temperature economizer and air preheater; 4. Metal filter bag dust collector; 5. SCR denitrification system; 6. Limestone-gypsum desulfurization system; 7. Chimney; 8. Activated carbon injection device. Detailed Implementation

[0018] As shown in the figure, a comprehensive chemical waste treatment system includes a boiler 1, a high-temperature economizer 2, a low-temperature economizer and an air preheater 3, a metal bag filter dust collector 4, an SCR denitrification system 5, a limestone-gypsum desulfurization system 6, and a chimney 7. The high-temperature economizer 2, the low-temperature economizer and the air preheater 3 are installed in the tail flue of the boiler 1. The high-temperature economizer 2 is located upstream, and its outlet is the flue gas inlet I. The low-temperature economizer and the air preheater 3 are located downstream, and their outlets are the flue gas inlet II. The flue gas inlet I is connected to the dust collection system 4, which is connected to the SCR denitrification system 5, and the SCR denitrification system 5 is connected to the boiler 1. The flue gas inlet II is connected to the limestone-gypsum desulfurization system 6, which is connected to the chimney 7. The dust collection system 4 is a metal bag filter dust collector, and an activated carbon injection device 8 is installed at the inlet of the metal bag filter dust collector.

[0019] The metal bag filter dust collector is installed at the inlet of the SCR reactor in the SCR denitrification system 5; the metal bag filter dust collector uses metal filter bags made of nickel-based alloy;

[0020] Chimney 7 is installed at the outlet of the absorption tower of limestone-gypsum desulfurization system 6; the absorption tower of limestone-gypsum desulfurization system 6 is coated with glass flakes; the glass flakes coated on the inlet flue of the absorption tower of limestone-gypsum desulfurization system 6 are high-temperature resistant glass flakes.

[0021] The above embodiments are only for illustrating the technical concept and features of the utility model, and are intended to enable those skilled in the art to understand the content of the utility model and implement it accordingly. They should not be construed as limiting the scope of protection of the utility model. All equivalent changes or modifications made in accordance with the spirit and essence of the utility model should be covered within the scope of protection of the utility model.

Claims

1. A comprehensive chemical waste treatment system, comprising a boiler, a dust removal system, an SCR denitrification system, a limestone-gypsum desulfurization system, and a chimney, characterized in that, The system also includes a high-temperature economizer, a low-temperature economizer, and an air preheater. The high-temperature economizer, the low-temperature economizer, and the air preheater are installed in the flue at the tail end of the boiler. The high-temperature economizer is located upstream, and its outlet is the flue gas inlet I. The low-temperature economizer and the air preheater are located downstream, and their outlets are the flue gas inlet II. The flue gas intake port I is connected to a dust removal system, which is connected to an SCR denitrification system, which is connected to a boiler. The flue gas intake II is connected to a limestone-gypsum desulfurization system, which is connected to a chimney.

2. The comprehensive chemical waste treatment system according to claim 1, characterized in that, The dust removal system is a metal bag filter dust collector; the metal bag filter dust collector is installed at the inlet of the SCR reactor in the SCR denitrification system.

3. The comprehensive chemical waste treatment system according to claim 2, characterized in that, The metal bag filter dust collector uses metal filter bags made of nickel-based alloy.

4. The comprehensive chemical waste treatment system according to claim 1, characterized in that, The chimney is installed at the outlet of the absorption tower in the limestone-gypsum desulfurization system.

5. The comprehensive chemical waste treatment system according to claim 1, characterized in that, The absorber of the limestone-gypsum desulfurization system is brushed with glass flakes; the glass flakes brushed on the inlet flue of the absorber of the limestone-gypsum desulfurization system are high-temperature resistant glass flakes.

6. The comprehensive treatment system for chemical waste according to claim 2, characterized in that, The inlet of the metal filter bag dust collector is equipped with an activated carbon injection device.

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