阅读说明：本技术 一种煤棒生产工艺 (Coal rod production process ) 是由 李翔 张力 万建华 徐化林 杨世立 田文成 于 2019-08-29 设计创作，主要内容包括：本发明公布了一种煤棒生产工艺,制配液：在制液罐内加入质量分数为30％—34％的氢氧化钠溶液,逐渐加入含腐植酸42％—48％的褐煤并通入蒸汽,使其在制液罐内升至96℃,再降温到94℃后保温3.7—4.3小时,将所述粘结剂配入粉煤中且粘结剂与粉煤的重量比值为0.11—0.15,煤棒成型：粘结剂与粉煤在所述熟料仓内堆沤达到40小时后形成熟料；用水调节熟料干湿,搅拌均匀,一并送入煤棒机成型,成型后的煤棒以备后续烘干；煤棒烘干：把煤棒送入烘干窑料仓内,与来自热风炉和锅炉烟气的热风换热,使煤棒中水份≤2％。本工艺制备的煤棒强度好,固定碳高,入炉后几乎不会发生粉化、爆裂、塌陷的现象,使得造气炉床层阻力小。(The invention discloses a coal rod production process, which comprises the following steps: adding 30-34% of sodium hydroxide solution by mass into a liquid preparation tank, gradually adding 42-48% of lignite containing humic acid, introducing steam, heating the liquid preparation tank to 96 ℃, cooling to 94 ℃, preserving heat for 3.7-4.3 hours, adding the binder into pulverized coal, wherein the weight ratio of the binder to the pulverized coal is 0.11-0.15, and molding a coal rod: the adhesive and the pulverized coal are piled in the clinker silo for 40 hours to form clinker; adjusting the dryness and the humidity of the clinker aggregate by using water, uniformly stirring, sending the clinker aggregate into a coal rod machine for molding, and preparing the molded coal rod for subsequent drying; drying the coal rod: the coal rod is sent into a bin of a drying kiln to exchange heat with hot air from a hot-blast stove and flue gas of a boiler, so that the moisture content in the coal rod is less than or equal to 2 percent. The coal rod prepared by the process has good strength and high fixed carbon, and hardly generates pulverization, bursting and collapse after entering the furnace, so that the bed resistance of the gas making furnace is small.)

1. A coal rod production process is characterized by comprising the following steps:

Preparing a liquid: adding 30-34% of sodium hydroxide solution by mass into a liquid preparation tank, starting a stirrer, gradually adding 42-48% of lignite containing humic acid, introducing steam, heating the liquid preparation tank to 96 ℃, cooling to 94 ℃, and then preserving heat for 3.7-4.3 hours to ensure that the sodium hydroxide fully extracts the humic acid in the lignite to generate a binder; the binder is mixed into pulverized coal, the weight ratio of the binder to the pulverized coal is 0.11-0.15, and finally the mixture is piled up in a clinker silo for use in the subsequent coal rod forming;

Forming a coal rod: the adhesive and the pulverized coal are piled in the clinker silo for 40 hours to form clinker; feeding coal into a coal hopper, then feeding the coal into a secondary stirrer, adjusting the dryness and the humidity of clinker by using water, uniformly stirring the clinker and the clinker, feeding the clinker and the clinker into a coal rod machine for forming, and preparing the formed coal rod for subsequent drying; it should be noted that when water is used for adjusting the dryness and the wetness of clinker, the addition amount of water is based on the natural fracture of a coal rod with the length of 45-55 cm extruded from the outlet of a coal rod machine;

drying the coal rod: the coal rod is sent into a bin of a drying kiln to exchange heat with hot air from a hot-blast stove and flue gas of a boiler, so that the moisture content in the coal rod is less than or equal to 2 percent.

2. the coal rod production process according to claim 1, wherein the sodium hydroxide solution is 32% by mass.

3. The coal rod production process according to claim 1, wherein the lignite contains 45% humic acid.

4. the coal rod production process according to claim 1, wherein the temperature is reduced to 94 ℃ and then is maintained for 4 hours.

5. The coal rod production process of claim 1, wherein the weight ratio of the binder to the pulverized coal is 7.6: 58.

6. The coal rod production process according to claim 1, wherein when the coal rod is dried, the top opening edge of the storage bin of the existing drying kiln extends horizontally towards the center and then vertically extends towards the bottom of the storage bin without contacting with the bottom of the storage bin so as to extend into a guide cover which is integrally formed by a circular plate-shaped wind shield and a cylindrical baffle plate, and a gap between the baffle plate of the guide cover and the inner wall of the storage bin of the drying kiln is used for allowing hot air entering from the side surface of the top of the drying kiln to flow vertically downwards and then flow from the gap between the bottom end of the baffle plate and the bottom of the storage bin of the drying kiln and then be discharged upwards through the interior of the cylindrical structure of the baffle plate.

Technical Field

The invention belongs to the technical field of briquette production lines, and particularly relates to a coal rod production process.

Background

With the obvious acceleration of industrialization and urbanization, the demand on energy resources is continuously and rapidly increased, and the production and the demand of coal have unprecedented high-speed growth situation, so that the problems of energy shortage, energy inefficient utilization, environmental pollution and the like are faced. Due to the restrictions of factors such as resource distribution, transportation conditions, and inter-site balance, coal blending and utilization are increasingly emphasized. The cheap pulverized coal is used for replacing the high-price lump coal, the production cost is reduced, the economic benefit is improved, and the method becomes the vital problem of medium and small nitrogen fertilizer plants at present. The adoption of pulverized coal resources to process the formed coal instead of lump coal for gas production is more the requirement of the development trend of the atmospheric fixed bed intermittent gas production process in China.

The briquette is made by binding powdered coal with binder and mechanically pressing into briquettes with different shapes. The coal rod is one of the existing mature molded coal, and is simple and not complex in process, but only is obtained by adding liquid into crushed raw coal, stirring, storing and molding by a molding machine. The coal rod capable of meeting the requirement of the intermittent gas making process of the atmospheric fixed bed has the obvious characteristics of high fixed carbon content, good mechanical strength and thermal stability and good chemical activity. The preparation of the coal rod which can meet the requirements of the intermittent gas making process of the atmospheric fixed bed generally comprises the following steps: the method comprises the steps of raw material selection, binder preparation and pulverized coal molding. For most of the coal rods which are common at present, the coal rods have poor cold and hot strength, low fixed carbon content and easy pulverization, bursting and collapse after entering a furnace.

Disclosure of Invention

The invention aims to solve the technical problems and provides a coal rod production process which can solve the problems of poor cold and hot strength, low fixed carbon content and easy pulverization, bursting and collapse after entering a furnace in the prior art to a certain extent.

The technical scheme of the invention is as follows: a coal rod production process comprises the following steps:

Preparing a liquid: adding 30-34% of sodium hydroxide solution by mass into a liquid preparation tank, starting a stirrer, gradually adding lignite containing 42-48% of humic acid, introducing steam, heating the lignite to 96 ℃ in the liquid preparation tank, cooling to 94 ℃, and keeping the temperature for 3.7-4.3 hours to ensure that the sodium hydroxide fully extracts the humic acid in the lignite to generate a binder; the binder is mixed into pulverized coal, the weight ratio of the binder to the pulverized coal is 0.11-0.15, and finally the mixture is piled up in a clinker silo for use in the subsequent coal rod forming;

forming a coal rod: the adhesive and the pulverized coal are piled in the clinker silo for 40 hours to form clinker; feeding coal into a coal hopper, then feeding the coal into a secondary stirrer, adjusting the dryness and the humidity of clinker by using water, uniformly stirring, feeding the clinker into a coal rod machine for forming, and preparing the formed coal rod for subsequent drying; it should be noted that when water is used for adjusting the dryness and the wetness of clinker, the addition amount of water is based on the natural fracture of a coal rod with the length of 45-55 cm extruded from the outlet of a coal rod machine;

Drying the coal rod: the coal rod is sent into a drying kiln bin and exchanges heat with hot air from a hot-blast stove and boiler flue gas, so that the water content in the coal rod is less than or equal to 2 percent.

The invention has the beneficial effects that: the coal rod production process provided by the invention can produce coal rods with good cold and hot strength and high fixed carbon, and hardly generates pulverization, bursting and collapse phenomena after entering a furnace, so that the resistance of a bed layer of a gas making furnace is small, thereby avoiding 'raw side clamping' to control the quality of the coal rods, and achieving the purposes of stabilizing the gas making working condition and reducing the consumption of raw material coal.

drawings

FIG. 1 is a schematic view of a conventional drying kiln;

Fig. 2 is a schematic view of the structure of the drying kiln of the present invention.

reference elements are numbered: the device comprises a feeding belt 1, a baffle plate 2, a discharging belt 3, a vibration tray 4, a drying bin 5, an air duct 6 and a wind shield 7.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

When the coal rod is prepared, the liquid can be prepared to obtain the binder, and the specific process comprises the following steps: adding a certain amount of water and caustic soda into the liquid preparation tank, mixing to obtain a sodium hydroxide solution with the mass fraction of 30% -34%, starting a stirrer, gradually adding lignite containing 42% -48% of humic acid, introducing steam, raising the temperature of the lignite in the liquid preparation tank to 96 ℃, cooling to 94 ℃, and preserving the temperature for 3.7-4.3 hours to ensure that the sodium hydroxide fully extracts the humic acid in the lignite to generate a qualified adhesive, namely a sodium humate solution. And (3) blending the prepared binder into pulverized coal by a liquid blending worker according to the characteristics of the raw coal, wherein the weight ratio of the binder to the pulverized coal is 0.11-0.15, and finally, composting the mixture by a curing bin for use in a forming post for forming a coal rod.

Forming a coal rod: and (3) carrying out composting for 40 hours, conveying the clinker from a clinker bin to a clinker skin conveyor by using a loader for transferring, discharging coal into a coal hopper, feeding all materials into a secondary stirrer, adjusting the dryness and the humidity of the clinker by using water, uniformly stirring, feeding the mixture into a coal rod machine for forming, and conveying the formed coal rod to a drying post by using a rod skin conveyor. When water is added to adjust the dryness and humidity of the clinker, primary water can be directly adopted, namely water pumped from a river, water subjected to simple impurity settling treatment is only adopted, other medicines are not added for treatment, the addition amount of the primary water has no specific index, and the principle of addition is mainly as follows: the primary water is added according to the condition of the coal rod at the outlet of the coal rod machine, namely, the forming length of the coal rod is 45-55 cm, preferably 49-51 cm. The coal rod coming out of the highest point of the coal rod machine outlet is naturally broken before contacting a belt for conveying, so that the coal rod can be naturally broken at the length of 45-55 cm after being extruded by the added water, and the coal rod is naturally broken at the optimal length of 50 cm; if the amount of water is small, the coal rod is broken in advance, so that the length of the coal rod cannot be ensured, if the amount of water is large, the coal rod at the highest point cannot be broken naturally, whether the breaking is directly related to the comprehensive performance such as the strength of the coal rod, and the strength is affected by the over-wet and over-dry coal rod. The amount of specific added water is typically obtained in a number of tests depending on the environment and the particular plant conditions.

After the coal rod is extruded, the coal rod needs to be dried: the coal rod is conveyed into a storage bin of the drying kiln through the discharging trolley on the conveying machine, exchanges heat with hot air from a hot air furnace and boiler flue gas to ensure that the moisture content in the coal rod is less than or equal to 2 percent, falls onto the conveying machine below the drying kiln through the discharging vibration tray, and is conveyed to the storage bin of the dry rod for standby through the conveying machine.

the following is a summary list of the comparison between various properties of the coal rod prepared under a plurality of sets of parameters within the process parameter range and the corresponding properties of the existing coal rod:

As can be seen from the above table, most of the coal rods prepared according to the process have lower pulverization, decrepitation and collapse rates than those of the current coal rods, and the coal rods in some examples even have no pulverization, decrepitation and collapse. In the aspect of cold and hot strength, the coal rod prepared by the process is obviously superior to the existing coal rod. And the fixed carbon content of the coal rod is generally higher than that of the existing coal rod. Therefore, the coal rod prepared by the process has good cold and hot strength and high fixed carbon, and hardly generates pulverization, bursting and collapse after entering the furnace, so that the bed resistance of the gas making furnace is small.