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Process for synchronously preparing low-nitrogen-content bio-oil and hydrothermal carbon from sludge

A nitrogen content and bio-oil technology, which is applied in the preparation of liquid hydrocarbon mixtures, the petroleum industry, and the treatment of hydrocarbon oils. It can solve the problems of unsatisfactory water content, high pollution risk, and high energy consumption, and improve the quality of bio-oil. , mild reaction conditions and good fuel performance

Pending Publication Date: 2021-11-16
NANJING UNIV OF INFORMATION SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Technical problem to be solved: This application mainly proposes a process for the synchronous preparation of bio-oil with low nitrogen content in sludge and hydrothermal carbon, which solves the problem that the water content in the prior art does not meet the requirements, and there are pollutants such as heavy metals and organic matter, High energy consumption, high pollution risk and other technical issues

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  • Process for synchronously preparing low-nitrogen-content bio-oil and hydrothermal carbon from sludge
  • Process for synchronously preparing low-nitrogen-content bio-oil and hydrothermal carbon from sludge
  • Process for synchronously preparing low-nitrogen-content bio-oil and hydrothermal carbon from sludge

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Embodiment 1

[0035] Embodiment 1: application example

[0036] The process for synchronous preparation of bio-oil with low nitrogen content in sludge and hydrothermal carbon, specifically includes the following steps:

[0037] Step 1: Pressurize and liquefy the DME in the DME gas cylinder through the booster pump and store it in the L-DME temporary storage tank for later use. After the booster pump is boosted, the pressure is 0.5-3MPa; Mud (moisture content 85%) was put into the DME extraction reactor, and then passed into L-DME to control the mass ratio of L-DME to the water content in the sludge, reaction time, reaction temperature, stirring speed distribution 15, 20min, 25 ℃, 750r / min.

[0038] Step 2: After the reaction is completed, open the valve below the DME extraction reactor and use the pressure difference (0.5Mpa) between the DME extraction reactor and the gas-liquid separation tank to pass through the filter screen (180 mesh stainless steel filter screen) laid at the bottom of...

Embodiment 2

[0041] Get 50g of sewage plant municipal dewatering sludge (moisture content 85%), measure the ash content and carbon content of former sludge, put this sludge into DME extraction reactor afterwards, obtain biological oil and water according to the process method of embodiment 1 Hot carbon, the properties of the measured product are shown in Table 1.

[0042] Table 1 Comparison of raw sludge and product properties

[0043]

[0044] a Based on dry basis weight

[0045] b Based on ash-free dry basis weight

[0046] It can be seen from Table 1 that L-DME extraction can greatly reduce the nitrogen content and improve the quality of bio-oil; at the same time, after the reaction, the C content increases by about 1.3 times, and the obtained hydrothermal carbon specific surface area can reach 15.782m2 / g, Subsequent modification can be further improved, so that it can be used as an adsorption material.

Embodiment 3

[0048] Get 50g of sewage plant municipal dewatered sludge (moisture content 85%) and put it into the reactor, then pass into liquid dimethyl ether, control the mass ratio of liquid dimethyl ether and water content in the sludge, reaction time, reaction temperature, stir The speed distribution is 15, 20min, 25°C, 750r / min. After the reaction is completed, the moisture content of the sludge is measured by the drying method.

[0049] Depend on figure 2 , 3 , 4. It can be seen that the effect is better when the mass ratio of liquid dimethyl ether to sludge water content is 10 to 13 times, the reaction time is 30 to 40 minutes, and the reaction temperature is 20 to 100°C.

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Abstract

The invention discloses a process for synchronously preparing low-nitrogen-content bio-oil and hydrothermal carbon from sludge, and belongs to the technical field of environmental engineering solid waste recycling and the technical field of biomass energy. The process comprises the following steps of: (1) extracting sludge by using liquid dimethyl ether to obtain low-nitrogen-content bio-oil; (2) separating a dimethyl ether phase from a residual solid phase; and (3) carrying out hydrothermal carbonization on solid-phase residues after extraction to obtain hydrothermal carbon. According to the method, harmless treatment, recycling and reduction of sludge are effectively realized. The generated low-nitrogen bio-oil and hydrothermal carbon can be used as fuel for heating a hydrothermal carbonization reactor, energy self-sufficiency is achieved, and the method has a wide application prospect in the aspect of sludge recycling.

Description

technical field [0001] The invention belongs to the technical field of solid waste recycling in environmental engineering and the technical field of biomass energy, and particularly relates to a process for synchronously preparing bio-oil with low nitrogen content in sludge and hydrothermal carbon. Background technique [0002] With the continuous increase of the generation of urban sewage in our country, the annual output of sludge is increasing year by year. Sludge has a high water content, and there are heavy metals, organic matter and other pollutants. Therefore, using conventional methods such as incineration and landfill to dispose of sludge has problems such as unsatisfactory moisture content, high energy consumption, and high pollution risk. [0003] At present, the commonly used municipal sludge disposal technologies mainly include four categories: sanitary landfill, dry incineration, land utilization and building material preparation (brick making, ceramsite makin...

Claims

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Application Information

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IPC IPC(8): C10G1/00C10G1/02C10G1/04C10B57/00
CPCC10G1/002C10G1/006C10G1/02C10G1/04C10B57/00C10G2300/1003
Inventor 梁耀匀王辰宇桂标赖俊蓓田金水罗新月吴超越
Owner NANJING UNIV OF INFORMATION SCI & TECH
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