Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Recycling method for deeply dewatering municipal sludge and gasifying and pyrolyzing sludge cake by aid of water vapor to produce hydrogen

A deep dewatering, municipal sludge technology, applied in gasification process, fixed bed gasification, pyrolysis treatment of sludge, etc., can solve problems such as difficult to fully contact, discounted catalytic pyrolysis effect, and uniform distribution.

Inactive Publication Date: 2016-12-14
DONGJIANG ENVIRONMENTAL +2
View PDF6 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN102557361A layered the sludge slurry after adding flocculant and enzyme treatment, took the sediment as raw material, and carried out gasification reaction, so that carbon-containing substances and supercritical water were gasified to obtain gas fuel, but the patent required Additional water is added to obtain water vapor that participates in the pyrolysis reaction
Chinese patent CN103396835A adds a catalytically active iron-containing oxidant and a calcium-based regulator in the sludge conditioning process, and uses the synergistic effect between the two to increase the amount of gas fuel generated in the gasification process, but the patent is not effective in sludge crushing. It needs to be heat-dried at 45-200°C for 5-30 minutes, which will increase the energy consumption of the pyrolysis process.
There may even be a dilemma that the calorific value of the pyrolysis gas cannot compensate for heat drying and pyrolysis energy consumption
In addition, it is often used to promote sludge pyrolysis by adding catalysts such as Ni, dolomite, etc., but it is difficult for external catalysts to be evenly distributed in sludge, and it is also difficult to fully contact, which greatly reduces the effect of catalytic pyrolysis and makes pyrolysis gas Medium hydrogen content and low quality of pyrolysis gas

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
  • Recycling method for deeply dewatering municipal sludge and gasifying and pyrolyzing sludge cake by aid of water vapor to produce hydrogen
  • Recycling method for deeply dewatering municipal sludge and gasifying and pyrolyzing sludge cake by aid of water vapor to produce hydrogen
  • Recycling method for deeply dewatering municipal sludge and gasifying and pyrolyzing sludge cake by aid of water vapor to produce hydrogen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The recycling method of deep dehydration of municipal sludge and steam gasification and pyrolysis of mud cake to produce hydrogen in this embodiment is carried out according to the following steps:

[0059] (1) Add 30kg of sludge into the sludge conditioning tank, add sulfuric acid solution to adjust the initial pH of the sludge to 5, and then add 8mol / LFeSO 4 Stir 2.41L of the solution, the stirring speed is 120rpm, and the stirring time is 2min, then add 3L of 10mol / L hydrogen peroxide for stirring, the stirring speed is 70rpm, and the stirring time is 25min, so that the oxidation reagent and the sludge fully react, and finally add 8kg red mud, and fast stirring for conditioning, the stirring speed is 120rpm, the stirring time is 6min, wherein, the oxide mass percentage content of iron in the red mud is 8%, the oxide mass percentage content of aluminum is 12%, the titanium content The mass percent content of oxides is 3%, the mass percent content of silicon dioxide an...

Embodiment 2

[0065] The recycling method of deep dehydration of municipal sludge and steam gasification and pyrolysis of mud cake to produce hydrogen in this embodiment is carried out according to the following steps:

[0066] (1) Put 30kg of sludge into the sludge conditioning tank, add hydrochloric acid solution to adjust the initial pH of the sludge to 7, and then 20mol / LFeCl 2 Stir 0.96L of the solution at a stirring speed of 150rpm for 3 minutes, then add 3.33L of 8mol / L hydrogen peroxide for stirring at a stirring speed of 100rpm and a stirring time of 30min to fully react the oxidizing agent and the sludge, and finally add Add 6.87kg red mud, and stir quickly for conditioning, the stirring speed is 150rpm, and the stirring time is 10min, wherein the mass percentage of iron oxide in the red mud is 40%, and the mass percentage of aluminum oxide is 13%. The mass percent content of titanium oxide is 11%, the mass percent content of silicon dioxide and other minerals is 36%, and finally ...

Embodiment 3

[0072] The recycling method of deep dehydration of municipal sludge and steam gasification and pyrolysis of mud cake to produce hydrogen in this embodiment is carried out according to the following steps:

[0073] (1) Put 30kg of sludge into the sludge conditioning tank, add sulfuric acid solution to adjust the initial pH of the sludge to 6, and then add 15mol / L FeSO 4 Stir 0.88L of the solution, the stirring speed is 200rpm, and the stirring time is 4min, then add 3L of 12mol / L hydrogen peroxide for stirring, the stirring speed is 120rpm, and the stirring time is 40min, so that the oxidation reagent and the sludge fully react, and finally add 7.5kg red mud, and fast stirring for conditioning, the stirring speed is 100rpm, the stirring time is 15min, wherein, the oxide mass percentage content of iron in the red mud is 42%, the oxide mass percentage content of aluminum is 15%, titanium The mass percent content of oxides was 12%, the mass percent content of silicon dioxide and o...

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 discloses a recycling method for deeply dewatering municipal sludge and gasifying and pyrolyzing sludge cake by the aid of water vapor to produce hydrogen, and belongs to the field of technologies for dewatering, pyrolyzing and utilizing municipal sludge. The recycling method includes steps of adding composite conditioners into the sludge to condition and improve the dewatering performance of the sludge so as to obtain conditioned sludge and dewatering and treating the conditioned sludge to obtain deeply dewatered sludge cake with the moisture content of 40-65%; further naturally drying and treating the deeply dewatered sludge cake to obtain dried and deeply dewatered sludge cake with the moisture content of 10-60%; carrying out sludge pyrolysis on the dried and deeply dewatered sludge cake in protective gas atmosphere to obtain pyrolysis gas. The composite conditioners comprise oxidizing reagents and red mud. The recycling method has the advantages that pyrolysis processes are low in comprehensive energy consumption, the yield of the pyrolysis gas can be increased, and the quality of the pyrolysis gas can be improved.

Description

technical field [0001] The invention belongs to the technical field of municipal sludge dehydration and pyrolysis utilization, and in particular relates to a resource utilization method for municipal sludge deep dehydration and mud cake steam gasification and pyrolysis to produce hydrogen. Background technique [0002] Municipal sludge is a by-product that accompanies the sewage treatment process. The composition of sludge is very complex. Due to the different water quality conditions, treatment processes and service areas of domestic sewage, the composition of sludge produced by various sewage treatment plants is also quite different, but its water content is very high. The moisture content of sludge is generally above 99%, which becomes a major factor limiting the subsequent treatment and disposal of sludge. At the same time, the content of organic matter in sludge is high, which is a potential biomass resource. Therefore, the sludge pyrolysis technology uses the organic...

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
IPC IPC(8): C02F11/14C02F11/10C10J3/02
CPCY02W10/40C02F11/14C02F11/10C10J3/02C10J2300/0923
Inventor 杨家宽宋健胡玖坤梁莎邓华利杨喜朋时亚飞虞文波徐新宇关若楠肖君陈烨胡敬平侯慧杰刘冰川
Owner DONGJIANG ENVIRONMENTAL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com