Method for Improving Sludge Coal-Water Slurry Slurry Performance Through Sludge Pretreatment

Abstract

The invention relates to the technology of sludge pretreatment, and aims to provide a method of improving slurrying performance of sludge-coal water slurry (S-CWS) by sludge pretreatment. The method includes the following steps: 1) adding a conditioner to the sludge with uniform mixing, and irradiating the mixture by microwave, thereby improving physical and chemical characters of the sludge through the pretreatment; and 2) blending the pretreated sludge with coal powder, water and a coal water slurry additive to prepare the S-CWS, wherein the conditioner is a chlorine salt, addition amount being 0.5-1% by mass of the sludge, frequency of the microwave is 2450 MHz or 900 MHz and micro irradiation time is 0.5-3 min. The method is simple and turns waste into resources, has significant social and economic benefit and is an effective reduction, harmlessness and recovery utilization method. Through the conditioner and the microwave irradiation for co-pretreatment modification, the method is easy and convenient to carry out and has very significant effect, can greatly increase the concentration of the S-CWS and blending quantity of sludge, and reduces viscosity of the S-CWS.

Description

technical field

[0001] The invention relates to sludge treatment technology, in particular to a method for improving the slurrying performance of sludge coal-water slurry. The specific method is to pretreat the sludge first, and then mix it with coal, water, additives, etc. to prepare sludge coal-water slurry, so as to greatly increase the slurry concentration of sludge coal-water slurry and increase the amount of sludge blended. Background technique

[0002] The distribution of fossil energy in my country is characterized by rich coal, poor oil, and little gas. Coal accounts for more than 60% of my country's primary energy consumption structure. This coal-based energy production and consumption structure will not change in a long period of time. Therefore, coal occupies a very important position in my country's national economic development and people's lives. Coal water slurry is a new type of coal-based liquid clean fuel, which is composed of about 60-70% pulverized coal,...

Examples

Embodiment 1

[0028] Material:

[0029]The sludge is mechanically dehydrated sludge from a sewage treatment plant in Hangzhou, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is sodium methylene naphthalene sulfonate-sodium styrene sulfonate-sodium maleate.

[0030] step:

[0031] Calculate the amount of wet sludge, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is not pretreated, and the corresponding quality of sludge, coal particles and corresponding proportions of water and additives are put into the variable frequency planetary ball mill, which occupies about one-third of the volume of the ball mill tank, and then according to the test requirements Put a certain proportion of steel balls (the diameters of large, me...

Embodiment 2

[0035] Material:

[0036] The sludge is the sludge after sewage treatment of a petrochemical enterprise in Nanjing, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is calcium lignosulfonate.

[0037] step:

[0038] Calculate the amount of wet sludge, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is not pretreated, and the corresponding quality of sludge, coal particles and corresponding proportions of water and additives are put into the variable frequency planetary ball mill, which occupies about one-third of the volume of the ball mill tank, and then according to the test requirements Put a certain proportion of steel balls (the diameters of large, medium and small balls are: 20mm, 10mm, and 6mm respect...

Embodiment 3

[0042] Material:

[0043] The sludge is mechanically dehydrated sludge from a sewage treatment plant in Hangzhou, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is sodium methylene naphthalene sulfonate-sodium styrene sulfonate-sodium maleate. Conditioning agent is potassium chloride.

[0044] step:

[0045] Calculate the amount of wet sludge, conditioner, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is pretreated, and the corresponding quality of sludge and conditioner is mixed evenly and then put into the microwave radiation device for modification for 0.5min. 1. The additive is packed into the frequency conversion planetary ball mill, and the steps of Example 1 are repeated later.

[0046] Mass per...

technical field

[0001] The invention relates to sludge treatment technology, in particular to a method for improving the slurrying performance of sludge coal-water slurry. The specific method is to pretreat the sludge first, and then mix it with coal, water, additives, etc. to prepare sludge coal-water slurry, so as to greatly increase the slurry concentration of sludge coal-water slurry and increase the amount of sludge blended. Background technique

[0002] The distribution of fossil energy in my country is characterized by rich coal, poor oil, and little gas. Coal accounts for more than 60% of my country's primary energy consumption structure. This coal-based energy production and consumption structure will not change in a long period of time. Therefore, coal occupies a very important position in my country's national economic development and people's lives. Coal water slurry is a new type of coal-based liquid clean fuel, which is composed of about 60-70% pulverized coal,...

Examples

Embodiment 1

[0028] Material:

[0029]The sludge is mechanically dehydrated sludge from a sewage treatment plant in Hangzhou, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is sodium methylene naphthalene sulfonate-sodium styrene sulfonate-sodium maleate.

[0030] step:

[0031] Calculate the amount of wet sludge, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is not pretreated, and the corresponding quality of sludge, coal particles and corresponding proportions of water and additives are put into the variable frequency planetary ball mill, which occupies about one-third of the volume of the ball mill tank, and then according to the test requirements Put a certain proportion of steel balls (the diameters of large, me...

Embodiment 2

[0035] Material:

[0036] The sludge is the sludge after sewage treatment of a petrochemical enterprise in Nanjing, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is calcium lignosulfonate.

[0037] step:

[0038] Calculate the amount of wet sludge, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is not pretreated, and the corresponding quality of sludge, coal particles and corresponding proportions of water and additives are put into the variable frequency planetary ball mill, which occupies about one-third of the volume of the ball mill tank, and then according to the test requirements Put a certain proportion of steel balls (the diameters of large, medium and small balls are: 20mm, 10mm, and 6mm respect...

Embodiment 3

[0042] Material:

[0043] The sludge is mechanically dehydrated sludge from a sewage treatment plant in Hangzhou, with a moisture content of about 80%. The coal is bituminous coal from Yanzhou, Shandong, and the air-dry basis moisture, ash, volatile matter and fixed carbon are 1.18%, 15.24%, 29.50% and 54.08%, respectively. The additive is sodium methylene naphthalene sulfonate-sodium styrene sulfonate-sodium maleate. Conditioning agent is potassium chloride.

[0044] step:

[0045] Calculate the amount of wet sludge, conditioner, coal (particle size ≤ 4mm), water and additives required for pulping according to the estimated concentration of coal-water slurry. The sludge is pretreated, and the corresponding quality of sludge and conditioner is mixed evenly and then put into the microwave radiation device for modification for 0.5min. 1. The additive is packed into the frequency conversion planetary ball mill, and the steps of Example 1 are repeated later.

[0046] Mass per...

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