Method and device for preparing synthesis gas and simultaneously recovering phosphorus from high-purity H2 through chemical-looping treatment of sludge

A synthesis gas and chemical chain technology, applied in chemical instruments and methods, inorganic chemistry, phosphate, etc., can solve problems such as high energy consumption, low gas calorific value, and large gas tar content

Pending Publication Date: 2021-02-05
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the existing technology effectively suppresses the conditions for producing dioxins, improves resource utilization efficiency, and realizes sludge resource reduction and reduction, it still has high energy consumption, high gas tar content, and low calorific value of the generated gas. The problem of insufficient waiting

Method used

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  • Method and device for preparing synthesis gas and simultaneously recovering phosphorus from high-purity H2 through chemical-looping treatment of sludge
  • Method and device for preparing synthesis gas and simultaneously recovering phosphorus from high-purity H2 through chemical-looping treatment of sludge
  • Method and device for preparing synthesis gas and simultaneously recovering phosphorus from high-purity H2 through chemical-looping treatment of sludge

Examples

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Embodiment 1

[0036] This embodiment discloses a method for directional production of synthesis gas by chemical looping gasification of sludge, which is realized through the following technical solutions:

[0037] Dehydration and drying: The sludge is dried at 80°C and dehydrated to a moisture content of 5% to obtain dried sludge.

[0038] Oxygen carrier preparation: Fe 2 o 3 、Al 2 o 3 The analytical pure is mechanically mixed at a mass ratio of 7:3, shaped by a planetary molding machine, calcined at 900°C for 4 hours, crushed and sieved into 40-60 mesh particles, and used as an iron-based oxygen carrier for sludge chemical chain gasification .

[0039] Chemical chain gasification: open the screw feeder, and the dried sludge enters the sludge reactor 1 from the material inlet 33 of the sludge reactor, and the feed rate is 1kg / h; the iron-based oxygen carrier passes through the oxygen carrier inlet of the sludge reactor 2 into the circulating fluidized bed system in the sludge reactor 1...

Embodiment 2

[0045] Since the method and device for directional production of synthesis gas by sludge chemical looping gasification are the same as those in Example 1, details will not be repeated here, and only the implementation conditions and implementation results are listed in Table 1, as shown in Table 1.

[0046] Table 1 Implementation conditions and results of sludge chemical chain reaction based on modified iron ore oxygen carrier

[0047]

[0048]

[0049] The preparation method of the modified iron ore in the present embodiment is: after the natural iron ore is pulverized, sieved, equal-volume impregnation of CoNi(NO 3 ) 2 , then dried at 200°C for 6 hours, and then calcined at 900°C for 3 hours to obtain modified iron ore.

Embodiment 3

[0051] Since the method and device for directional production of synthesis gas by chemical looping gasification of sludge are the same as those in Example 1, details will not be repeated here, and only the implementation conditions and implementation results are listed in Table 2, as shown in Table 2.

[0052] Table 2 NiFe-based 2 o 4 Implementation Conditions and Results of Sludge Chemical Chain Reaction of Oxygen Carriers

[0053]

[0054] The difference between embodiment 1 and embodiment 2 is that the oxygen carrier and reaction temperature used are different. Compared with the synthetic iron-based oxygen carrier in embodiment 1, the modified iron ore in embodiment 2 has better reactivity and carbon The conversion efficiency and the synthetic calorific value obtained are also higher. Adopt synthetic NiFe in embodiment 3 2 o 4 As an oxygen carrier, it has better carbon conversion efficiency and synthesis gas calorific value, but relatively speaking, the cost is highe...

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Abstract

The invention discloses a method and device for preparing synthesis gas and simultaneously recovering phosphorus from high-purity H2 through chemical-looping treatment of sludge. The method comprisesthe following steps: (1) introducing an oxygen carrier, carrier gas and sludge into a sludge reactor for reaction to obtain a mixture of synthesis gas, sludge ash and a reduction-state oxygen carrier,(2) introducing the mixture into a first separation system, separating the reduction-state oxygen carrier to obtain a mixture of synthesis gas and sludge ash, and introducing the mixture of synthesisgas and sludge ash into a second separation system for separation, (3) inputting the reduction-state oxygen carrier into a hydrogen production reactor, introducing an oxidant for reaction, and carrying out gas-solid separation on the reaction product through a third separation system to obtain H2 and an oxygen carrier, and (4) introducing the oxygen carrier into an oxidation reactor for oxidationreaction, and introducing the oxygen carrier after oxidation reaction into a sludge reactor for reaction. According to the method, the phosphorus element in the sludge is converted into soluble phosphate by adopting a chemical-looping reductive reaction atmosphere, so that high-purity H2 co-production is realized, and higher resource utilization efficiency is achieved.

Description

Technical field: [0001] The invention belongs to the technical field of fuel clean gasification, functional materials and environmental protection, and specifically relates to a kind of chemical chain treatment sludge to produce synthesis gas and high-purity H 2 A method and device for simultaneously recovering phosphorus. Background technique: [0002] Contrary to the increasing trend of sludge production year after year, the effective treatment rate of sludge in my country is low. As a by-product of sewage treatment, the composition of sludge is very complex. In addition to a large amount of water, sludge also contains nutrients such as heavy metals, organic matter, nitrogen and phosphorus, and organic matter. If the sludge is not properly treated, it will easily cause environmental pollution, waste of resources and endanger human health. Traditional sludge treatment methods mainly include sanitary landfill, farmland composting, ocean dumping, sludge incineration, etc.,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/48C01B3/06C01B25/26
CPCC01B3/063C01B25/26C10J3/48C10J2300/0923C10J2300/0953Y02E60/36
Inventor 魏国强黄振郑安庆王小波赵坤赵增立
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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