CN204298355U - A kind of preparation system of sludge water-coal-slurry - Google Patents

Abstract

The utility model discloses a kind of preparation system of sludge water-coal-slurry.It comprises coal bunker, disintegrating machine, screw(-type) feeder, raw sewage pond, sludge modification tank, fluid shock device, modified sewage sludge storehouse, waste liquid tank, kibbling mill and products pot; The outlet of coal bunker connects the import I of screw(-type) feeder by disintegrating machine; The outlet in raw sewage pond connects the import I of sludge modification tank, and the outlet of sludge modification tank connects the import II of fluid shock device, modified sewage sludge storehouse and screw(-type) feeder successively; The outlet of screw(-type) feeder connects the import I of kibbling mill; The outlet I of waste liquid tank connects the import II of sludge modification tank, and the outlet II of waste liquid tank connects the import II of kibbling mill; The outlet of kibbling mill connects the import of products pot.It has the following advantages: mud is modified through two-stage modified tank, solves the problem that mud addition is few and concentration is low, and saves modifier expense, make vast scale utilize mud prepare high concentration, high heating value, high fluidity water-coal-slurry become possibility.

Description

A preparation system for sludge coal-water slurry

technical field

The utility model relates to a preparation system of sludge coal-water slurry, which belongs to the technical field of resources and environment.

Background technique

Coal water slurry is a new type of coal-based fluid fuel or raw material, which has the characteristics of good fluidity, high combustion efficiency, energy saving and environmental protection, and is an ideal fuel and gasification raw material for replacing oil and coal. At present, my country's coal-water slurry preparation and combustion technology has matured and entered the stage of industrial application after more than 30 years of research and development and application, and has achieved good economic and environmental benefits. The industries where coal water slurry is applied involve electric power, petroleum and petrochemical, metallurgy, building materials, packaging and other industries.

With the rapid advancement of urbanization in my country, the amount of municipal sludge is increasing. According to statistics, the current annual output of sludge has reached more than 30 million tons. Due to the large number of urban industrial parks, domestic sewage treatment plants often mix industrial wastewater (liquid), resulting in high heavy metal content in sludge. At present, landfill is the main treatment method for sludge in China, and the utilization rate of resource and energy utilization is low. The reduction of incineration is obvious, and it is one of the directions of sludge treatment in the world. However, the calorific value of sludge itself is low, about 1500kcal/kg, and usually cannot be directly burned. Utilizing the ultra-fine particles of sludge and the characteristics of a certain calorific value, the sludge and coal are mixed to prepare coal-water slurry, thereby effectively reducing the investment and treatment cost of sludge treatment, which is an effective method for sludge harmlessness and resource utilization. It is also in line with the national policies of energy conservation, emission reduction and circular economy.

Due to the characteristics of low solid content, high water holding capacity and non-fluidity of sludge, when sludge is directly blended with coal, there are problems such as difficulty in mixing, small amount of mixing, and low concentration of sludge and coal slurry. In recent years, relevant domestic scientific and technological workers have mostly adopted the pulping process of modifying sludge first and then preparing sludge coal-water slurry. Although the concentration of coal slurry has increased, there are still low concentrations of sludge and coal slurry, additives Problems such as large consumption and high pulping cost.

Utility model content

The purpose of this utility model is to provide a preparation system of sludge coal-water slurry, the preparation system prepares sludge coal-water slurry by blending with coal after deeply modifying the sludge, the preparation system has the sludge addition amount When more or the same amount of sludge is added, the prepared coal slurry has higher concentration and less additive dosage, so it can treat sludge at a lower cost, and achieve the purpose of sludge resource utilization, reduction, and harmlessness.

The sludge coal-water slurry preparation system provided by the utility model includes a coal bunker, a crusher, a screw feeder, an original sludge pool, a sludge modified tank, a fluid shock wave device, a modified sludge bin, a waste Liquid tanks, coarse grinders and product tanks;

The outlet of the coal bunker is connected to the inlet I of the screw feeder through the crusher;

The outlet of the original sludge tank is connected to the inlet I of the sludge modification tank, the outlet of the sludge modification tank is connected to the inlet of the fluid shock wave device, and the outlet of the fluid shock wave device passes through a pump Connect the inlet of the modified sludge bin, and connect the outlet of the modified sludge bin to the inlet II of the screw feeder;

The outlet of the screw feeder is connected to the inlet I of the coarse grinder;

The outlet I of the waste liquid tank is connected to the inlet II of the sludge modification tank, and the outlet II of the waste liquid tank is connected to the inlet II of the rough mill;

The outlet of the coarse grinder is connected to the inlet of the product tank.

In the above-mentioned preparation system, a high-shear tank, a slurry filter and a homogeneous aging tank are sequentially connected between the outlet of the coarse grinder and the inlet of the product tank.

In the above preparation system, the inlet III of the sludge modification tank is connected to the outlet of the modifier tank.

In the above preparation system, the inlet III of the coarse grinder is connected to the additive tank.

In the above preparation system, the other outlet of the homogeneous aging tank is connected to the inlet of a fine grinder, and the outlet of the fine grinder is connected to the inlet IV of the coarse grinder;

When in use, the coal slurry ground by the fine grinder enters the coarse grinder to achieve the particle size distribution required by the coal slurry and reduce power consumption.

In the above preparation system, the inlet I of the sludge modification tank, the inlet II of the sludge modification tank, the inlet III of the sludge modification tank, the inlet I of the screw feeder, the The inlet II of the screw feeder, the inlet I of the coarse grinder, the inlet II of the coarse grinder, the inlet III of the coarse grinder and the inlet IV of the coarse grinder are all provided with a metering device.

In the above preparation system, an agitator is arranged on the top of the sludge modification tank, and the agitator is connected to an agitator.

In the utility model, the fluid shock wave device has the function of secondary modification of sludge, and the modification of sludge is carried out under a high pressure of 40-160 MPa. Through the action of high pressure and shock wave, the polypropylene in the sludge The structure of the amide polymer is destroyed, and the molecular chain is shortened or twisted, so that part of the water in the molecule becomes free water, and the free water obtained can replace the pulping water in the sludge pulping process, thereby saving water. The effect; and the sludge after its secondary modification changes from a viscous liquid to a very fluid liquid, which can be evenly mixed with coal to prepare a higher concentration of coal-water slurry.

The working process of using the utility model to prepare sludge coal-water slurry is as follows:

1) The raw coal in the coal bunker 1 is conveyed to the crusher through the belt conveyor, and the crusher crushes the raw coal until the diameter of the coal particles is less than 6mm and accounts for more than 80% of the total mass of the coal particles.

2) The sludge is transported from the original sludge tank to the sludge modification tank, and the waste water (liquid) is transported from the waste liquid tank to the sludge modification tank through the pipeline for primary modification. Sludge, waste water ( Liquid) in the sludge modification tank, the modified sludge with good fluidity is obtained through high-speed stirring for a certain period of time, and then all the modified sludge is sent to the fluid shock wave modification device for secondary modification. The grade modified sludge is pumped to the modified sludge bin.

3) According to the preset mass ratio, the crushed coal particles are transported to the screw feeder through the conveyor belt, and at the same time, the modified sludge in the modified sludge bin is transported to the screw feeder through the pump, and the screw The feeder mixes the coal particles and modified sludge and sends them to the coarse mill.

4) The coarse grinder grinds the mixture together with the dispersant from the dispersant tank, and at the same time adds water (liquid) according to the predetermined coal slurry concentration, when the coal particles in the ground coal slurry reach the particle size required by the coal-water slurry When grading, the ground coal slurry is transported to the high shear tank, slurry filter and homogeneous aging tank in turn for treatment to obtain the finished sludge coal slurry, and 10% to 30% of the total mass of the finished sludge coal water slurry It is discharged into the fine grinding and coarse grinding machine, and 90% to 70% of the remaining total mass of the finished sludge coal-water slurry is discharged into the product tank.

5) 10% to 30% of the total mass of the sludge coal slurry is wet finely ground in the fine grinder, and the obtained fine coal slurry is transported to the coarse grinder for circular grinding. Adding 10% to 30% of the total mass of the coal slurry ground by a fine mill can quickly achieve the particle size distribution required by the coal slurry and reduce power consumption.

The utility model has the following advantages:

(1) The utility model is equipped with a sludge modification tank (sludge primary modification tank) and a fluid shock wave device (sludge secondary modification tank), and the sludge primary modification tank is to mix sludge with alkali Sexual modifiers such as waste water (liquid) are input into the sludge primary modification tank according to a certain proportion and fully stirred and mixed to make it a modified sludge with certain fluidity. Waste water (liquid) includes papermaking black liquor, printing and dyeing Waste water, sodium hydroxide or calcium hydroxide, etc. Then add a certain amount of water to the first-stage modified sludge, enter the fluid shock wave device for second-stage modification of the sludge, and make the sludge a uniform flowing liquid; the sludge has been modified in two stages, which not only solves the problem of sludge addition Small amount, low concentration, and cost-saving modifiers make it possible to prepare high-concentration, high-calorific-value, and high-fluidity coal-water slurry by using a large proportion of sludge.

(2) The sludge modifier waste liquid adopted in the utility model is a strong alkaline waste liquid, which can save the cost of the modifier, save the treatment cost of the waste liquid, and can also use less or no fresh water Pulping saves water for pulping; in addition, the sludge itself can also act as a stabilizer for coal-water slurry; therefore, the cost of pulping can be greatly reduced.

(3) The fluid shock wave device adopted in the utility model is carried out under the high pressure of 40-160MPa. Through the effect of high pressure and shock wave, the structure of the polyacrylamide macromolecule in the sludge is destroyed, and the molecular chain changes. Short or twisted, the water in the molecule becomes free water, which can replace part of the pulping water in the sludge pulping process; at the same time, the sludge changes from viscous liquid to very fluidity after secondary modification Liquid, can be evenly mixed with coal to prepare higher concentration coal water slurry.

(4) The solids in the sludge contain organic matter and have a certain calorific value, which can not only replace part of the coal used in pulping, but also achieve the purpose of recycling and harmless sludge.

Description of drawings

Fig. 1 is a flow diagram of the preparation system of the utility model sludge coal-water slurry.

detailed description

The utility model is further described below in conjunction with the accompanying drawings, but the utility model is not limited to the following embodiments.

Embodiment 1, the preparation system of sludge coal-water slurry

As shown in Figure 1, it is the preparation system of sludge coal-water slurry of the present invention, which includes coal bunker 1, crusher 2, screw feeder 3, original sludge pool 7, sludge modification tank 6, fluid excitation Wave device 5, modified sludge bin 4, waste liquid tank 9, rough mill 10 and product tank 16. The outlet of the coal bunker 1 is connected to the inlet I of the screw feeder 3 through the crusher 2 via a belt conveyor (not shown in the figure) (a metering device is provided). The outlet of the original sludge tank 7 is connected to the inlet I of the sludge modification tank 6 (a metering device is installed), the top of the sludge modification tank 6 is provided with an agitator (not shown in the figure), and the agitator is connected to the mixer (not shown in the figure) , the inlet II of the sludge modification tank 6 (with a metering device) is connected to the outlet I of the waste liquid tank 9, the inlet III of the sludge modification tank 6 (with a metering device) is connected to the outlet of the modifier tank 8, and the sludge modification The outlet of the tank 6 is connected to the inlet of the fluid shock wave device 5, and the outlet of the fluid shock wave device 5 is connected to the inlet of the modified sludge bin 4 through a pump (not shown), and the outlet of the modified sludge bin 4 is connected to the screw Inlet II of the feeder 3 (set metering device). The outlet of the screw feeder 3 is connected to the inlet I of the coarse grinder 10 (metering device is set), the inlet II of the coarse grinder 10 (metering device is set) is connected to the outlet II of the waste liquid tank 9, and the inlet III of the coarse grinder 10 ( metering device) is connected to the additive tank; the outlet of the coarse mill 10 is connected to the inlet of the high shear tank 12, the outlet of the high shear tank 12 is connected to the inlet of the slurry filter 13, and the outlet of the slurry filter 13 is connected to the homogeneous aging tank 14 An inlet of the homogeneous aging tank 14 is connected to the inlet of the product tank 16. Another outlet of the homogeneous aging tank 14 is connected to the inlet of the fine grinder 15, and the outlet of the fine grinder 15 is connected to the inlet IV of the rough grinder 10 (metering device is set).

The working process of using the utility model to prepare sludge coal-water slurry is as follows:

1) The raw coal in the coal bunker 1 is conveyed to the crusher 2 through the belt conveyor, and the crusher 2 crushes the raw coal until the diameter of the coal particles is less than 6mm and accounts for more than 80% of the total mass of the coal particles.

2) The sludge is transported from the original sludge pool 7 to the sludge modification tank 6, and the waste water (liquid) is transported from the waste liquid tank 9 to the sludge modification tank 6 through the pipeline for primary modification, and the sewage Sludge and waste water (liquid) are in the sludge modification tank 6, and the modified sludge with good fluidity is obtained by high-speed stirring for a certain period of time, and then all the modified sludge is sent to the fluid shock wave modification device 5 for further processing. Secondary modification, the second-stage modified sludge is pumped into the modified sludge bin 4.

3) According to the preset mass ratio, the crushed coal particles are transported to the screw feeder 3 through the conveyor belt, and at the same time, the modified sludge in the modified sludge bin 4 is transported to the screw feeder 3 through a pump Among them, the screw feeder 3 mixes the coal particles and the modified sludge and sends them to the rough mill 10.

4) The coarse grinder 10 grinds the mixture together with the dispersant from the dispersant tank 11, and simultaneously adds waste water (liquid) according to the predetermined coal slurry concentration. When the coal particles in the ground coal slurry meet the requirements of the coal-water slurry During particle size grading, the coal slurry after grinding is transported to the high shear tank 12, the slurry filter 13 and the homogeneous aging tank 14 successively for processing to obtain the finished sludge coal slurry, and 10% of the total mass of the finished product coal water slurry ~30% is discharged into the fine grinding coarse mill 15, and the finished product coal-water slurry of 90% ~ 70% of the remaining total mass is discharged into the product tank 16.

5) 10% to 30% of the total mass of the sludge coal slurry is wet finely ground in the fine grinder 15, and all the obtained fine coal slurry is transported to the coarse grinder 10 for circular grinding. The purpose of this step is Adding 10% to 30% coal slurry ground by the fine grinder 15 into the coarse grinder 10 can quickly achieve the particle size distribution required by the coal slurry and reduce power consumption.

The specific application of adopting the utility model to prepare sludge coal slurry is as follows:

1. Preparation of sludge coal-water slurry with bituminous coal as raw material

1) The bituminous coal in the coal bunker is transported to the crusher 2, and the crusher 2 crushes it until the coal particle diameter is less than 6 mm, accounting for more than 80%.

2) The sludge is transported to the sludge modification tank 6 through the screw feeder, and the waste water (liquid) is also transported to the sludge modification tank 6 through the pipeline, and the mass ratio of the sludge to the waste liquid is 1: 1. Mix the two at high speed for a period of time to obtain the first-grade modified sludge.

3) The primary modified sludge in step 2) is sent to the fluid shock wave device 5, and the mixture is subjected to secondary modification at a pressure of 40 MPa to 80 MPa to obtain a secondary modified sludge with low viscosity and good fluidity .

4) Send the bituminous coal particles obtained in step 1) and the modified sludge obtained in step 3) into the screw feeder 3 according to the mass parts: 20 parts of modified sludge, 64.2 parts of coal powder and 0.4 parts of additives After mixing and conveying it to the coarse grinder 10 .

5) Send 15.4 parts of waste water (liquid) into rough mill 10 according to predetermined bituminous coal slurry concentration (bituminous coal slurry mass concentration is 65%), rough mill 10 is to modified sludge, coal powder, additive, waste liquid etc. After coarse grinding, the coal slurry obtained is delivered to high shear tank 12, slurry filter 13, homogeneous aging tank 14 and processed to obtain bituminous coal sludge coal-water slurry product (wherein the product of total mass 10% enters fine coarse grinder) 15, the product of total mass 90% enters in the product tank 16).

The mass concentration of the bituminous coal sludge coal-water slurry prepared above is 65.2%.

2. Preparation of sludge coal-water slurry with low-rank coal as raw material

1) Transporting the low-rank coal to the crusher 2 for crushing until the particle size is less than 1 mm, accounting for more than 80%;

2) Send the sludge and sodium hydroxide into the sludge modification tank 6 with an agitator according to the mass ratio of 100:1, and add waste water (liquid) of twice the amount of the mixture through the waste liquid tank 9, and pass through a certain After high-speed stirring for a period of time, the first-grade modified sludge is obtained.

3) The primary modified sludge in step 2) is sent into the fluid shock wave device 5, and the mixture is subjected to secondary modification at a pressure of 60 MPa to 80 MPa to obtain a secondary modified sludge with low viscosity and good fluidity .

3) The crushed low-rank coal particles, modified sludge, additives, and waste water (liquid), according to the mass parts: 60 parts of coal powder, 30 parts of modified sludge, 0.5 parts of additives and 9.5 parts of waste water (liquid) Transfer to screw feeder 3 for mixing and transfer to coarse grinder 10.

4) Coarse grinder 10, after coarsely grinding modified sludge, coal powder, waste water (liquid), etc., transports the obtained low-rank coal sludge slurry to high-shear tank 12, slurry filter 13 and homogeneous aging in sequence. The tank 14 is processed to obtain the sludge coal-water slurry product of low-rank coal (20% of the total mass of the product enters the fine grinder 15, and 80% of the total mass of the product enters the product tank 16).

The mass concentration of the low-rank coal sludge coal-water slurry prepared above is 62.2%.

In summary, the sludge coal slurry prepared by the utility model can greatly increase the proportion of sludge mixed in the coal slurry, and the mass proportion of the modified sludge mixed in the coal slurry can be as high as 30%. The mass concentration of the sludge coal-water slurry produced is above 60%, and no stabilizer is needed.

The above-mentioned embodiments are only used to illustrate the utility model, wherein the structure and connection mode of each component can be changed, and any equivalent transformation and improvement carried out on the basis of the technical solution of the utility model should not be excluded. Outside the scope of protection of the present utility model.

The above-mentioned biomass used to produce biomass coal slurry includes not only municipal sludge and papermaking waste liquid, but also other industrial and domestic sludge (from urban sewage treatment methods and petrochemical, light industry, chemical fiber, papermaking, pharmaceutical, leather and other industries) industry water treatment method) and wastewater (liquid) waste liquid (papermaking wastewater (liquid), printing and dyeing wastewater (liquid), domestic wastewater (liquid), chemical wastewater (liquid), ironmaking wastewater (liquid), coking wastewater (liquid) wait).

Claims (7)

1. A preparation system for sludge coal-water slurry, characterized in that: it includes a coal bunker, a crusher, a screw feeder, an original sludge tank, a sludge modification tank, a fluid shock wave device, and a modified sludge bins, waste tanks, coarse grinders and product tanks; The outlet of the coal bunker is connected to the inlet I of the screw feeder through the crusher; The outlet of the original sludge tank is connected to the inlet I of the sludge modification tank, the outlet of the sludge modification tank is connected to the inlet of the fluid shock wave device, and the outlet of the fluid shock wave device passes through a pump Connect the inlet of the modified sludge bin, and connect the outlet of the modified sludge bin to the inlet II of the screw feeder; The outlet of the screw feeder is connected to the inlet I of the coarse grinder; The outlet I of the waste liquid tank is connected to the inlet II of the sludge modification tank, and the outlet II of the waste liquid tank is connected to the inlet II of the rough mill; The outlet of the coarse grinder is connected to the inlet of the product tank. 2. The preparation system according to claim 1, characterized in that: a high shear tank, a slurry filter and a homogeneous aging tank are sequentially connected between the outlet of the coarse grinder and the inlet of the product tank. 3. The preparation system according to claim 1 or 2, characterized in that: the inlet III of the sludge modification tank is connected to the outlet of the modifier tank. 4. The preparation system according to claim 3, characterized in that: the inlet III of the coarse grinder is connected to an additive tank. 5. The preparation system according to claim 4, characterized in that: the other outlet of the homogeneous aging tank is connected to the inlet of a fine grinder, and the outlet of the fine grinder is connected to the inlet IV of the coarse grinder . 6. The preparation system according to claim 5, characterized in that: the inlet I of the sludge modification tank, the inlet II of the sludge modification tank, the inlet III of the sludge modification tank, the The inlet I of the screw feeder, the inlet II of the screw feeder, the inlet I of the coarse grinder, the inlet II of the coarse grinder, the inlet III of the coarse grinder and the coarse grinder The inlet IV of the machine is equipped with a metering device. 7. The preparation system according to claim 6, characterized in that: an agitator is arranged on the top of the sludge modification tank, and the agitator is connected to an agitator.