CN108410535B - Sludge microbubble-excited fuel and preparation method thereof - Google Patents

Sludge microbubble-excited fuel and preparation method thereof Download PDF

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Publication number
CN108410535B
CN108410535B CN201810341356.XA CN201810341356A CN108410535B CN 108410535 B CN108410535 B CN 108410535B CN 201810341356 A CN201810341356 A CN 201810341356A CN 108410535 B CN108410535 B CN 108410535B
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sludge
calcium carbide
colloid
microbubble
stirring
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CN108410535A (en
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祁彧
张弛
岳秀萍
刘敬唐
苏冰琴
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Taiyuan University of Technology
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L5/00—Solid fuels
    • C10L5/40—Solid fuels essentially based on materials of non-mineral origin
    • C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

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  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The invention relates to a microbubble-excited fuel technology using sludge of a municipal sewage plant as a main raw material, belongs to the technical field of environmental engineering, and particularly relates to sludge microbubble-excited fuel and a preparation method thereof. The invention relates to a sludge microbubble-excited fuel, which is prepared by the following method: (1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring to form liquefied sludge; (2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) to serve as gelatinizing agents, and stirring to form a honeycomb-shaped sludge colloid; (3) preparing a composite separator by adopting a pectin aqueous solution and saturated salt solution, and uniformly mixing the composite separator and blocky calcium carbide to prepare salt glue calcium carbide; (4) the method comprises the steps of uniformly mixing cellular sludge colloid with salt colloid calcium carbide, adding coal powder into a low-speed stirrer, stirring for 20-35 minutes in a granulator to prepare spherical particles with the particle size of 15-20 mm, and drying to prepare microbubble-excited sludge fuel.

Description

Sludge microbubble-excited fuel and preparation method thereof
Technical Field
The invention relates to a microbubble-excited fuel technology using sludge of a municipal sewage plant as a main raw material, belongs to the technical field of environmental engineering, and particularly relates to sludge microbubble-excited fuel and a preparation method thereof.
Background
Sludge in municipal sewage plants is a byproduct generated in the sewage treatment process, and the sludge treatment is an important link of water pollution prevention and treatment work, and becomes one of key problems restricting the development of sewage treatment. The amount of sludge produced is influenced by factors such as the amount of sewage treated, the treatment process, the sludge dewatering method, and the like. At present, the dehydrated sludge of a sewage plant has high water content and is difficult to transport and receive in a landfill. Although sludge contains a large amount of substances that can be used as fuel in terms of chemical composition, sludge is not suitable for direct use as fuel in the present situation and cannot be directly used for incineration power generation. Although a plurality of sludge treatment and disposal technologies exist at home and abroad, the method still faces a plurality of problems of complex technology, large engineering application difficulty, multiple secondary pollution hidden dangers, high process implementation cost and the like.
At present, most of sludge treatment methods cannot fully utilize sludge, but only for the consideration of harmlessness, the treatment method is far from recycling. With the continuous rising of energy price and the continuous formation of the low-carbon emission reduction trend in the world, the recycling of sludge becomes the mainstream direction. Many scientific researches and practical experiences of sludge treatment show that the heat value contained in the sludge originally can reach 6000-16000 kJ/kg, but the heat value detected in an actual laboratory is only 500-2000 kJ/kg, and the heat value cannot be brought into play due to the fact that the water content of the sludge is too high. Therefore, the reduction of the water content of the sludge is a key factor for realizing the sludge fuel.
The traditional sludge centrifugation and filter pressing dehydration method can only remove partial water, and the water content of the dehydrated sludge still cannot meet the requirement of fuel conversion. The energy cost of the traditional sludge drying and dewatering is high. Although the sludge carbonization technology is basically feasible, the energy consumption is large, and harmful gas is easily generated. The existing sludge fuel technology generally depends on a large amount of blended coal and similar high-calorific-value fuel, so that the additive cost is greatly increased.
Disclosure of Invention
The invention aims to provide a novel fuel technology which takes dewatered sludge of municipal domestic sewage treatment plants as a main raw material. In particular to a sludge microbubble-excited fuel with low cost and high efficiency and a preparation method thereof. Has obvious scientific value, social value and economic value.
The technical scheme adopted by the invention to realize the purpose is as follows:
a sludge microbubble-excited fuel is prepared by the following steps:
(1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring for 5-10 min at the rotating speed of 200-240 r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.2-1.6% of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, and stirring for 10-15 min at the rotating speed of 60-90 r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 80-85: 7-6: 7-6: 6-3;
(3) preparing a composite separator by using 1.3-2.0% of pectin aqueous solution and saturated salt solution in percentage by mass, adding 10-20 g of blocky calcium carbide into 1-2 mL of the composite separator, uniformly mixing to prepare the salt glue calcium carbide, wherein the volume ratio of the pectin aqueous solution to the saturated salt solution is as follows: 0.75-0.80: 0.25-0.20;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion that 3-6kg of salt glue calcium carbide is added into 1-2L of honeycomb sludge colloid, adding coal powder accounting for 15-22% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring in a granulator for 20-35 minutes to prepare spherical particles with the particle size of 15-20 mm, and drying in the air to prepare the microbubble excited sludge fuel.
Preferably, the particle size of the blocky calcium carbide in the step (3) is 20-25 mm.
Preferably, the aqueous pectin solution in step (3) of the present invention is prepared by dissolving a high-ester citrus pectin powder having a dry powder purity of greater than 95% in distilled water.
The preparation method of the sludge microbubble-excited fuel comprises the following steps:
(1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring for 5-10 min at the rotating speed of 200-240 r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.2-1.6% of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, and stirring for 10-15 min at the rotating speed of 60-90 r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 80-85: 7-6: 7-6: 6-3;
(3) preparing a composite separator by using 1.3-2.0% of pectin aqueous solution and saturated salt solution in percentage by mass, adding 10-20 g of blocky calcium carbide into 1-2 mL of the composite separator, and uniformly mixing the composite separator and the blocky calcium carbide to prepare salt glue calcium carbide;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion that 3-6kg of salt glue calcium carbide is added into 1-2L of honeycomb sludge colloid, adding coal powder accounting for 15-22% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring in a granulator for 20-35 minutes to prepare spherical particles with the particle size of 15-20 mm, and drying in the air to prepare the microbubble excited sludge fuel.
Preferably, the spherical particles in step (4) of the present invention are dried by natural ventilation.
Preferably, the particle size of the blocky calcium carbide in the step (3) is 20-25 mm.
Preferably, the aqueous pectin solution in step (3) of the present invention is prepared by dissolving a high-ester citrus pectin powder having a dry powder purity of greater than 95% in distilled water.
According to the technical scheme, the sludge is stirred at a high speed (the rotating speed is 200-240 r/min), so that the viscous sludge is cut violently, the sludge is liquefied, the fluidity is enhanced, and meanwhile, with the help of the high-speed stirring, sludge particles and a stirring cutter collide and rub at a high speed, capillary bound water of the sludge is broken, and molecular water tightly wrapped by sludge fibers is extruded. Before stirring, adding sodium potassium tartrate into the sludge to further promote the realization of the fluidity of the sludge; simultaneously, adding glycerol, bone glue and acrylic acid into the liquefied sludge to serve as gelatinizing agents, and after the gelatinizing agents are added, slowly stirring (60-90 r/min) to modify the mixed suspension into a honeycomb-shaped sludge colloid so as to prepare for later-stage reaction; the invention adopts pectin aqueous solution and saturated salt solution to prepare a composite separator, and the composite separator is mixed with blocky calcium carbide to prepare the salt glue calcium carbide. The method comprises the steps of putting blocky calcium carbide, the pectin solution and the saturated salt solution into a container, adopting a firm cutter to quickly crush the blocky calcium carbide and play a role in stirring, wherein the granularity of the calcium carbide is gradually reduced from 20-25 mm to 3-6 mm in the process, and a layer of pectin-salt solution is uniformly covered on the surface of calcium carbide particles. The key of the technology is that the calcium carbide is wrapped by the pectin-salt composite separator to play a role in separating air, and the contact area of calcium carbide particles and air is greatly reduced. The product produced by the above process is called "salt glue calcium carbide" granule.
The invention relates to a controlled reaction of calcium carbide and water in sludge.
The salt colloid calcium carbide particles are mixed with the colloid sludge, and water molecules in the sludge and the salt colloid calcium carbide particles can generate chemical reaction.
CaC2+2H2O＝＝Ca(OH)2+C2H2↑
The water molecules include both free water of the colloidal sludge and intracellular bound water in the sludge.
At the moment, when the coated dispersed calcium carbide meets water, the reaction is carried out under the controlled condition, the bubble releasing speed is reduced by 55 to 65 percent compared with the speed when pure calcium carbide particles are contacted with water, and the generated bubbles can be ensured to reside in the sludge mixture and not to be rapidly lost.
On the other hand, because the colloid sludge is contacted with the calcium carbide instead of the conventional original sludge, the generated bubbles are wrapped and agglomerated by the colloid substances, and are quickly cemented and shaped without quick rupture. In the sludge dried body produced by the mixing reaction, a large amount of reaction-excited 'microbubbles' exist, and the microbubbles have a cementing and solidifying capability.
The microbubble excited sludge body is put into a low-speed stirrer, coal powder accounting for 15-22% of the weight of the sludge body is added, and the mixture is stirred in a granulator for 20-35 minutes to prepare spherical particles with the particle size of 15-20 mm. And then, placing the spherical particles in a natural ventilation field, and airing for 1.5-2.0 hours to further shape the spherical particles to obtain a final microbubble-excited sludge fuel product. The water content of the sludge fuel product prepared by the invention is 18-25%, and the low-grade heat value is 6000-8500 kJ/kg.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method has the advantages that the dewatered sludge of the municipal sewage plant with the water content of 70-75% is used as a core raw material, waste utilization of the sludge is realized, and pollution diffusion of the sludge is avoided. And a new process method is provided for solving the problem of sludge dehydration, the method is a typical ecological environment-friendly technology, and the prepared product can be used as fuel of various boilers such as thermal power plants and the like, and has high market popularization value.
(2) The novel 'colloid sludge' is prepared by using glycerol, bone glue and acrylic acid as gelatinizing agents, and is an innovative technology. Pectin and saturated salt solution are prepared into a composite separator, and the composite separator is mixed with blocky calcium carbide to prepare the salt glue calcium carbide.
In the process of rapidly crushing and stirring blocky calcium carbide, pectin-salt solution is uniformly covered on the surfaces of calcium carbide particles to prepare calcium carbide wrapped by a composite isolator, so that the calcium carbide particles are prevented from contacting with air to further realize the controlled reaction of the calcium carbide and water in sludge. When the wrapped 'dispersed calcium carbide' meets water, the speed of releasing bubbles is greatly reduced compared with the speed when pure calcium carbide particles contact the water, so that the bubbles stay in the sludge mixture and cannot be quickly lost.
On the other hand, the air bubbles are wrapped and condensed by the colloid substance, and are quickly cemented and shaped without being quickly broken.
(3) The additives adopted by the technology are cheap and easily available materials, the applicability is strong, and the operation is simple and convenient. An external heating source is not needed, and a large amount of heat energy consumption required by conventional sludge drying is avoided. Belongs to an energy-saving process and is convenient for industrial application.
Detailed Description
Example 1
A sludge microbubble-excited fuel is prepared by the following steps:
(1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring for 10min at the rotation speed of 200r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.2 percent of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, stirring for 15min at the rotating speed of 60r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 80: 7: 7: 6;
(3) preparing a composite separator by using 1.3 to percent of pectin aqueous solution and saturated salt solution in percentage by mass, adding 10g of blocky calcium carbide into 1mL of the composite separator, uniformly mixing the composite separator and the blocky calcium carbide to prepare the salt glue calcium carbide, wherein the volume ratio of the pectin aqueous solution to the saturated salt solution is as follows: 0.75: 0.25;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion that 3kg of salt glue calcium carbide is added into 1L of honeycomb sludge colloid, adding coal powder accounting for 15% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring for 20 minutes in a granulator to prepare spherical particles with the particle size of 15mm, and naturally ventilating and airing to prepare the microbubble-excited sludge fuel.
In this example, the particle size of the bulk calcium carbide in step (3) is 20mm, and the aqueous pectin solution in step (3) is prepared by dissolving high-ester citrus pectin powder having a dry powder purity of greater than 95% in distilled water.
Example 2
A sludge microbubble-excited fuel is prepared by the following steps:
(1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring for 8min at the rotating speed of 220r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.4 percent of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, stirring for 12min at the rotating speed of 70r/min to form honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 83: 6: 6: 4;
(3) preparing a composite separator by using 1.7% by mass of pectin aqueous solution and saturated salt solution, adding 15g of blocky calcium carbide into 1.5mL of the composite separator, uniformly mixing the composite separator and the blocky calcium carbide to prepare the salt glue calcium carbide, wherein the volume ratio of the pectin aqueous solution to the saturated salt solution is as follows: 0.78: 0.22;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion that 5kg of salt glue calcium carbide is added into 1.5L of honeycomb sludge colloid, adding coal powder accounting for 20% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring in a granulator for 30 minutes to prepare spherical particles with the particle size of 18mm, and drying in the air to prepare the microbubble-excited sludge fuel.
In this example, the particle size of the blocky calcium carbide in step (3) is 22mm, and the pectin aqueous solution in step (3) is prepared by dissolving high-ester citrus pectin powder with a dry powder purity of more than 95% in distilled water.
Example 3
A sludge microbubble-excited fuel is prepared by the following steps:
(1) taking sludge in a sewage plant, adding sodium potassium tartrate into the sludge, and stirring for 5min at the rotation speed of 240r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.6 percent of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, stirring for 10min at the rotating speed of 90r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 85: 6: 6: 3;
(3) preparing a composite separator by adopting 2.0 percent of pectin aqueous solution and saturated salt solution in percentage by mass, adding 20g of blocky calcium carbide into 2mL of the composite separator, uniformly mixing to prepare salt glue calcium carbide, wherein the volume ratio of the pectin aqueous solution to the saturated salt solution is as follows: 0.80: 0.20;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion of adding 6kg of salt glue calcium carbide into 2L of honeycomb sludge colloid, adding coal powder accounting for 22% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring for 35 minutes in a granulator to prepare spherical particles with the particle size of 20mm, and drying to prepare the microbubble-excited sludge fuel.
In this example, the particle size of the blocky calcium carbide in step (3) is 25mm, and the pectin aqueous solution in step (3) is prepared by dissolving high-ester citrus pectin powder with a dry powder purity of more than 95% in distilled water.

Claims (3)

1. The sludge microbubble-excited fuel is characterized by being prepared by the following method:
(1) taking sludge in a sewage plant, wherein the water content of the sludge is 70-75%, adding sodium potassium tartrate into the sludge, and stirring for 5-10 min at the rotation speed of 200-240 r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.2-1.6% of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, and stirring for 10-15 min at the rotating speed of 60-90 r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 80-85: 7-6: 7-6: 6-3;
(3) preparing a composite separator by using 1.3-2.0% of pectin aqueous solution and saturated salt solution in percentage by mass, adding 10-20 g of blocky calcium carbide into 1-2 mL of the composite separator, uniformly mixing to prepare the salt glue calcium carbide, wherein the volume ratio of the pectin aqueous solution to the saturated salt solution is as follows: 0.75-0.80: 0.25-0.20;
(4) uniformly mixing the honeycomb sludge colloid and salt glue calcium carbide according to the proportion of adding 3-6kg of salt glue calcium carbide into 1-2L of the honeycomb sludge colloid, adding coal powder accounting for 15-22% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring in a granulator for 20-35 minutes to prepare spherical particles with the particle size of 15-20 mm, and drying in the air to prepare sludge microbubble excitation fuel;
the particle size of the blocky calcium carbide in the step (3) is 20-25 mm;
the pectin aqueous solution in the step (3) is prepared by dissolving high-ester citrus pectin powder with the dry powder purity of more than 95% in distilled water.
2. The method for producing sludge microbubble-excited fuel according to claim 1, characterized by comprising the steps of:
(1) taking sludge in a sewage plant, wherein the water content of the sludge is 70-75%, adding sodium potassium tartrate into the sludge, and stirring for 5-10 min at the rotation speed of 200-240 r/min to form liquefied sludge, wherein the sodium potassium tartrate accounts for 1.2-1.6% of the weight of the sludge;
(2) adding glycerol, bone glue and acrylic acid into the liquefied sludge in the step (1) as gelatinizing agents, and stirring for 10-15 min at the rotating speed of 60-90 r/min to form a honeycomb-shaped sludge colloid, wherein the volume ratio of the liquefied sludge to the glycerol to the bone glue to the acrylic acid is 80-85: 7-6: 7-6: 6-3;
(3) preparing a composite separator by using 1.3-2.0% of pectin aqueous solution and saturated salt solution in percentage by mass, adding 10-20 g of blocky calcium carbide into 1-2 mL of the composite separator, and uniformly mixing the composite separator and the blocky calcium carbide to prepare salt glue calcium carbide;
(4) the method comprises the steps of uniformly mixing honeycomb sludge colloid and salt glue calcium carbide according to the proportion that 3-6kg of salt glue calcium carbide is added into 1-2L of honeycomb sludge colloid, adding coal powder accounting for 15-22% of the weight of the honeycomb sludge colloid in a low-speed stirrer, stirring in a granulator for 20-35 minutes to prepare spherical particles with the particle size of 15-20 mm, and drying in the air to prepare the sludge microbubble excitation fuel.
3. The method for preparing sludge microbubble-excited fuel according to claim 2, wherein the spherical particles in the step (4) are dried by natural ventilation.
CN201810341356.XA 2018-04-17 2018-04-17 Sludge microbubble-excited fuel and preparation method thereof Active CN108410535B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5537426A (en) * 1978-09-04 1980-03-15 Denki Kagaku Kogyo Kk Production of calcium carbide
CN1062578C (en) * 1995-09-19 2001-02-28 刘开平 Production method of composite heat-insulating material
FR2755700B1 (en) * 1996-11-14 1998-12-18 Pechiney Electrometallurgie PROCESS FOR TREATING STEEL IN AN ELECTRIC ARC OVEN TO OBTAIN A FOAMED MILK
CN101935740B (en) * 2010-09-21 2012-09-05 攀枝花钢城集团有限公司 White slag refining agent for LF (Ladle Furnace) refining furnace and preparation method thereof
CN102517115A (en) * 2011-12-31 2012-06-27 青州市圣洁环保设备科技有限公司 Method and device for producing bunker coal with sludge
CN206418079U (en) * 2017-01-03 2017-08-18 江苏大学 A kind of laboratory with the explosion prevention function that loses heart prepares acetylene unit

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