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Method for preparing hydrogen-rich synthesis gas by utilizing metallurgical slag waste heat to treat sludge in grading manner

A technology for grading treatment and synthesis gas, which is used in pyrolysis treatment of sludge, production of combustible gas, dehydration/drying/concentrated sludge treatment, etc. It can solve the problems of low hydrogen content and high energy consumption, protect the environment and save resources. , the effect of improving the application value

Pending Publication Date: 2020-07-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Based on this, the present invention provides a method for preparing hydrogen-rich synthesis gas from sludge by utilizing waste heat of metallurgical slag in graded treatment (drying, pyrolysis, gasification), which can realize sludge graded treatment and solve the problem of high energy consumption in the thermal conversion process of sludge , The technical problem of low hydrogen content in the produced gas, at the same time, this process realizes the effective recovery and utilization of waste heat of high-temperature solid particles

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  • Method for preparing hydrogen-rich synthesis gas by utilizing metallurgical slag waste heat to treat sludge in grading manner

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Embodiment 1

[0023] A method for preparing hydrogen-rich synthesis gas from waste heat of metallurgical slag graded treatment sludge described in this implementation is as follows:

[0024] (1) The liquid slag is made into slag particles at 1100°C by granulation technology, and the particle size is 1~2mm.

[0025] (2) Wet sludge is dried. The drying temperature range is 300~100°C. The low-temperature slag at 300°C is mixed with the pre-filtered wet sludge with a moisture content of 50% in a mass ratio of 1:1. After heat exchange between the wet sludge and the slag, the water is heated and evaporates to form water vapor, and the sludge contains water. rate dropped below 5%. The temperature of the slag particles is reduced to about 100°C.

[0026] (3) Pyrolysis of dried sludge. The pyrolysis temperature range is 800~300℃. The medium-temperature slag particles at 800°C are mixed with the dried sludge produced in step (2) at a mass ratio of 1:0.6. The dry sludge absorbs the heat of the s...

Embodiment 2

[0030] A method for preparing hydrogen-rich synthesis gas from waste heat of metallurgical slag graded treatment sludge described in this implementation is as follows:

[0031] (1) The liquid slag is made into 900°C slag particles through granulation technology, and the particle size is 1~2mm.

[0032] (2) Wet sludge is dried. The drying temperature range is 250~100°C. The low-temperature slag at 250°C is mixed with the pre-filtered wet sludge with a moisture content of 20% in a mass ratio of 1:0.5. After heat exchange between the wet sludge and the slag, the water is heated and evaporates to form water vapor, and the sludge contains water. rate dropped below 5%. The temperature of the slag particles is reduced to about 100°C.

[0033] (3) Pyrolysis of dried sludge. The pyrolysis temperature range is 600~250℃. The medium-temperature slag particles at 600°C are mixed with the dried sludge produced in step (2) at a mass ratio of 1:0.3. The dry sludge absorbs the heat of th...

Embodiment 3

[0037] A method for preparing hydrogen-rich synthesis gas from waste heat of metallurgical slag graded treatment sludge described in this implementation is as follows:

[0038] (1) The liquid slag is made into slag particles at 1000°C by granulation technology, and the particle size is 1~2mm.

[0039] (2) Wet sludge is dried. The drying temperature range is 350~100°C. The low-temperature slag at 350°C is mixed with the pre-filtered wet sludge with a moisture content of 35% in a mass ratio of 1:0.75. After heat exchange between the wet sludge and the slag, the water is heated and evaporates to form water vapor, and the sludge contains water. rate dropped below 5%. The temperature of the slag particles is reduced to about 100°C.

[0040](3) Pyrolysis of dried sludge. The pyrolysis temperature range is 700~350℃. The medium-temperature slag particles at 700°C are mixed with the dried sludge produced in step (2) at a mass ratio of 1:0.45. The dry sludge absorbs the heat of th...

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Abstract

The invention discloses a method for preparing hydrogen-rich synthesis gas by utilizing metallurgical slag waste heat to treat sludge in a grading manner. The method comprises the steps of wet sludgedrying, dry sludge pyrolysis, semicoke gasification and the like. The method comprises the following steps that high-temperature spherical slag particles are prepared from metallurgical slag, whereinthe slag particles respectively provide heat for wet semicoke gasification, dry sludge pyrolysis and sludge drying step by step, wet sludge is converted into dry sludge through heat exchange with slagparticles, and after heat exchange with the slag particles, the dry sludge undergoes a pyrolytic reaction to generate semicoke, pyrolysis gas and tar, semicoke and water vapor undergo a gasificationreaction to absorb the heat of slag particles, and hydrogen-rich synthesis gas is generated. According to the method, the waste heat recovery efficiency of the solid slag particles is improved to 80%,the content of CO and H2 in the produced gas after thermal conversion of the sludge is improved, and the sum of the content of H2 and CO in the produced gas is improved to 95%. Meanwhile, the efficient resource utilization of the sludge and the metallurgical slag is realized.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a method for preparing hydrogen-rich synthesis gas from waste heat of metallurgical slag by graded treatment sludge. Background technique [0002] Municipal sewage sludge is a toxic and harmful solid waste formed after treatment and separation. In recent years, with the increase in the number of urban sewage treatment plants, the total amount of sludge has continued to increase. my country's sludge output reaches tens of millions of tons every year. Currently, the main treatment methods for sewage sludge are landfill or composting. Landfill has potential safety hazards and pollutes the environment; composting has food safety risks and is difficult to promote. Moreover, most sewage treatment plants in my country pay more attention to sewage than sludge, and nearly 50% of the sludge has not been harmlessly treated. [0003] Thermochemical conversion represented ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/10C02F11/13C10J3/60
CPCC02F11/10C02F11/13C10J3/60C10J2300/1665C10J2300/1631Y02W10/40Y02P20/10Y02P20/129
Inventor 左宗良罗思义毕学军
Owner QINGDAO TECHNOLOGICAL UNIVERSITY