Unlock instant, AI-driven research and patent intelligence for your innovation.

Green calcining system and process for preparing aggregate from solid waste

A calcination process and aggregate technology, applied in the field of green calcination system, can solve the problems of complex system, insufficient heat source, complex process, etc., and achieve the effect of good mixing effect, saving processing cost and improving thermal efficiency.

Pending Publication Date: 2022-04-15
TIANJIN CEMENT IND DESIGN & RES INST
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) When solid waste is used as raw material to prepare aggregate, the flue gas from the rotary kiln contains volatile organic compounds, which are difficult to deal with by conventional tail gas treatment methods
[0008] (2) When the comprehensive moisture content of the material ball is high, and the heat source provided by the original system for the flue gas from the kiln tail and the hot air from the cooler is insufficient, it is necessary to add an additional supplementary heat source to the hot blast furnace, which increases the heat consumption and complicates the system
[0009] (3) Dust removal, desulfurization, denitrification, deodorization and other processes need to be carried out through the tail gas treatment system for flue gas exiting the kiln and drying machine, the process is complex and the cost is high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Green calcining system and process for preparing aggregate from solid waste
  • Green calcining system and process for preparing aggregate from solid waste
  • Green calcining system and process for preparing aggregate from solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Please see attached figure 1 with attached figure 2 . The dotted line with arrows is the direction of airflow, and the solid line with arrows is the direction of material flow. The air entering the system from the burner is the primary air, the air entering the rotary kiln from the cooler is the secondary air, the air entering the pellet dryer from the cooler is the tertiary air, and the air entering the reburning furnace is also the tertiary air.

[0066] A green calcination system for preparing aggregates from solid waste, the calcination system includes a reburning furnace 1 , a rotary kiln 2 , a cooling machine 3 , a pellet dryer 4 , and a heat exchanger 5 . The cooler 3 is connected to the air inlet of the pellet dryer 4 through the tertiary air pipe 6, and the air outlet of the pellet dryer 4 is connected to the low-temperature heat source inlet of the heat exchanger 5 through the low-temperature heat source air inlet pipe 7, and the heat exchange The low-temp...

Embodiment 2

[0074] In this embodiment, ceramsite is taken as an example, which is a kind of aggregate, and a green calcination process for preparing aggregate from solid waste is described.

[0075] A green calcination system and process for preparing aggregates from solid waste includes a ceramsite generation process, waste heat utilization process and flue gas treatment process.

[0076] The specific process of ceramsite formation is as follows:

[0077] S1: solid waste is used as the main raw material, and after the raw material is processed, wet pellet a with a moisture content of 10%-20% is obtained. The wet pellet a enters pellet dryer 4 and is dried to obtain dry pellet b;

[0078] S2: The dry material ball b is fed from the material ball inlet 107 of the reburning furnace 1 and then enters the rotary kiln 2 to be calcined to obtain ceramsite. By controlling the amount of fuel d fed into the rotary kiln 2, the calcination temperature in the rotary kiln 2 is controlled to 900 -1200...

Embodiment 3

[0094] See image 3 .

[0095] Different from Embodiment 1, the high-temperature heat source air outlet pipe 10 is also provided with a high-temperature heat source air outlet branch pipe 11 , and the high-temperature heat source air outlet branch pipe 11 is connected to the tertiary air pipe 6 . The low-temperature heat source air inlet pipe 7 is also connected with the low-temperature heat source circulating air pipe 12 , and the low-temperature heat source circulating air pipe 12 is connected with the high-temperature heat source outlet branch pipe 11 .

[0096] When the heat of the tertiary air is not enough to meet the drying requirements of the wet pellets, a high-temperature heat source can be introduced and the flue gas from the reburning furnace can be used for drying. However, the temperature of this part of the flue gas is relatively high, and the temperature of the flue gas passing into the dryer should not be too high. into the dryer.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention belongs to the technical field of environmental protection engineering, and particularly relates to a green calcining system and process for preparing aggregate through solid waste, the green calcining system for preparing the aggregate through the solid waste comprises a reburning furnace, a material ball drying machine, a cooling machine and a heat exchanger, the cooling machine is connected with an air inlet of the material ball drying machine through a tertiary air pipe, and the heat exchanger is connected with a secondary air pipe; an air outlet of the pellet dryer is connected with a low-temperature heat source air inlet of the heat exchanger through a low-temperature heat source air inlet pipeline, and a low-temperature heat source air outlet of the heat exchanger is connected with the reburning furnace through a combustion-supporting air pipeline. According to the invention, while aggregate is prepared, waste heat in a calcining system is fully utilized for combustion supporting, pellet drying and the like, so that the heat efficiency of the system is improved, and the energy consumption of the system is reduced; the problems of treatment and emission of harmful substances such as volatile organic compounds, SO2, NOx, malodorous gas and the like generated in the flue gas when the solid waste is consumed are solved, and the green calcining system and process for preparing the aggregate by using the solid waste are realized.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering, and in particular relates to a green calcining system and process for preparing aggregates from solid waste. Background technique [0002] current technology: [0003] Solid waste is an environmental pollutant that generates a large amount and is difficult to deal with. Some solid wastes such as sludge, fly ash, construction spoil, slag, etc. are similar to aggregates such as clay and shale, which are natural raw materials of ceramsite. After treatment, it can be used to prepare aggregates, which can solve the environmental pollution problem caused by solid waste stockpiling to a certain extent, and at the same time increase the added value of solid waste. [0004] When using solid waste to prepare aggregate, solid waste such as organic pollutants, eutrophic pollutants and pathogenic microorganisms contained in sludge can be almost completely decomposed into water va...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F27B19/04F27D15/02F27D17/00F26B21/14C04B18/02
Inventor 陈昌华彭学平林敏燕胡芝娟韩辉
Owner TIANJIN CEMENT IND DESIGN & RES INST