CN101921643B

CN101921643B - Method for improving fusion temperature of coal ash by utilizing limestone as additive

Info

Publication number: CN101921643B
Application number: CN 201010242310
Authority: CN
Inventors: 姚伟; 陈怀珍; 王桂芳; 顾小愚; 杨忠灿; 谷红伟; 刘家利; 蒙毅; 何红光; 薛宁; 缪希伟
Original assignee: China Shenhua Energy Co Ltd; Xian Thermal Power Research Institute Co Ltd; Shenhua Coal Trading Co Ltd
Current assignee: China Shenhua Energy Co Ltd; Xian Thermal Power Research Institute Co Ltd; Shenhua Coal Trading Co Ltd
Priority date: 2010-07-30
Filing date: 2010-07-30
Publication date: 2013-01-02
Anticipated expiration: 2030-07-30
Also published as: CN101921643A

Abstract

本发明涉及一种利用石灰石作为添加剂提高煤灰熔融温度的方法，包括如下步骤：1：在需要原料煤中抽样得到煤样本，并将该煤样本磨制到60目以下后进行灰化，得到标准煤灰样；2：测定标准煤灰样的灰熔融温度；3：将标准煤样本和石灰石按照质量比99∶1的比例均匀混合成混合物，测定该待测煤灰样的灰熔融温度，并和步骤2中测定的标准煤灰样的灰熔融温度进行比较；4：将石灰石的质量比例比步骤3增加2％，测定该待测煤灰样的灰熔融温度，并和步骤3中测定的煤灰样的灰熔融温度进行比较；步骤5：确定石灰石添加剂的质量比例范围。本发明可减轻燃用神华煤的锅炉的结渣，并对锅炉上金属部件不具有腐蚀作用。The invention relates to a method for increasing the melting temperature of coal ash by using limestone as an additive, comprising the following steps: 1: taking a sample from the required raw coal to obtain a coal sample, grinding the coal sample to a size below 60 mesh, and then ashing to obtain Standard coal ash sample; 2: measure the ash fusion temperature of the standard coal ash sample; 3: uniformly mix the standard coal sample and limestone into a mixture according to the mass ratio of 99:1, and measure the ash fusion temperature of the coal ash sample to be tested, And compare with the ash fusion temperature of the standard coal ash sample measured in step 2; 4: increase the mass ratio of limestone by 2% than step 3, measure the ash fusion temperature of the coal ash sample to be measured, and measure in step 3 Compare the ash fusion temperature of the coal ash sample; Step 5: Determine the mass ratio range of the limestone additive. The invention can reduce the slagging of the boilers burning Shenhua coal, and has no corrosive effect on the metal parts on the boilers.

Description

A kind of method of utilizing Wingdale to improve coal ash melting temperature as additive

Technical field

The present invention relates to a kind of method that improves coal ash melting temperature, particularly relate to a kind of method of utilizing Wingdale to improve coal ash melting temperature as additive.

Background technology

Reserves reach more than 2,200 hundred million tons Firing Shenhua Coal, and to exist grey melt temperature low, easy slagging scorification when causing burning, even the accident that can cause boiler explosion occurs, and affects safe operation of the boiler.For fear of the Firing Shenhua Coal slagging scorification, adopt at present coal blending to improve the Firing Shenhua Coal ash fusion point, but Shenhua coal blending resource-constrained, simultaneously coal blending also can affect harbour shipment efficient, adopt the additive that reduces Firing Shenhua Coal slagging scorification in boiler operatiopn for this reason, more and more become the main method that improves the Shenhua coal ash melting temperature.

Also do not improve at present the method for Shenhua coal ash melting temperature for the special additive of Firing Shenhua Coal, use the additive of Firing Shenhua Coal or take sodium salt and sylvite as main, but, in practice, sodium salt and sylvite there is no raising to the Shenhua coal ash melting temperature, and, since dosage without determinacy, even the situation generation that the Shenhua coal ash melting temperature is reduced, the major cause that causes this situation is CaO and Fe in the Firing Shenhua Coal ash component ₂O ₃Content is higher, and sodium salt and sylvite are applicable to CaO and Fe ₂O ₃The coal of other that content is low, sodium salt and sylvite also have the corrosive nature to metal parts on the boiler in addition, have equally also consisted of the factor to the dangerous operation of boiler.

Summary of the invention

The object of the invention is to, overcome the defective of above-mentioned prior art and a kind of method of utilizing Wingdale to improve the Shenhua coal ash melting temperature is provided, determine to reach the purpose of the scope that improves Firing Shenhua Coal ash fusibility temperature by the ratio of progressively adding Wingdale in the Shenhua coal ash, thereby alleviate the slagging scorification of the boiler that uses Firing Shenhua Coal, Wingdale does not have corrosive nature to metal parts on the boiler in addition, has eliminated the corrosive nature of sodium salt and sylvite to the factor of the dangerous operation of boiler.

For achieving the above object, the present invention takes following design:

A kind of method of utilizing Wingdale to improve coal ash melting temperature as additive, described method comprises the steps: step 1: sampling obtains coal sample in needing the feed coal of additive, and carry out ashing after grinding this coal sample below 60 orders, obtain the standard coal ash sample; Step 2: the grey melt temperature of bioassay standard coal ash sample namely obtains coal ash texturing temperature, coal ash softening temperature, coal ash hemispherical temperature and coal ash yield temperature; Step 3: standard coal sample and Wingdale are uniformly mixed into mixture according to 99: 1 ratio of mass ratio, carry out ashing after grinding this mixture below 60 orders, obtain containing the coal ash sample to be measured of Wingdale additive, measure the grey melt temperature of this coal ash sample to be measured, and and step 2 in the grey melt temperature of the standard coal ash sample measured compare; Step 4: according to the method for step 3, the mass ratio of Wingdale is increased by 2% than step 3, and carry out ashing after grinding corresponding mixture below 60 orders, then measure the grey melt temperature of this coal ash sample to be measured, and and step 3 in the grey melt temperature of the coal ash sample measured compare; Step 5: if the mean value that double grey melt temperature increases below 30 ℃, is determined between the minimum value and maximum value of mass ratio range for the mass ratio of this twice corresponding Wingdale that relatively adds of Wingdale additive; If the mean value that double grey melt temperature increases is greater than 30 ℃, repeated execution of steps 4.

Preferably, in described step 3, the grey melt temperature that mensuration is contained the coal ash sample of measuring in the grey melt temperature of coal ash sample of Wingdale additive and the step 2 compares item by item, coal ash texturing temperature, coal ash softening temperature, coal ash hemispherical temperature and the coal ash yield temperature that is about to measure respectively in step 2 and the step 3 carried out correspondence relatively, and try to achieve the difference of each temperature, difference is obtained the mean value that grey melt temperature increases divided by 4.

More preferably, adding mass ratio range in the feed coal is that the Wingdale of 5-9% is as additive.

Advantage of the present invention is: owing to of the present inventionly determine to reach the purpose that improves Firing Shenhua Coal ash fusibility temperature by the ratio of progressively adding Wingdale in the Shenhua coal ash, thereby alleviate the slagging scorification of the boiler that uses Firing Shenhua Coal, Wingdale does not have corrosive nature to metal parts on the boiler in addition, has eliminated the corrosive nature of sodium salt and sylvite to the factor of the dangerous operation of boiler.

Embodiment

The present invention will be described in more detail below in conjunction with embodiment.

Present embodiment utilizes Wingdale to improve the method for Shenhua coal ash melting temperature, and step is as follows:

Step 1: sampling obtains Firing Shenhua Coal sample 20 gram in needing the Firing Shenhua Coal of additive, and carries out ashing after this Firing Shenhua Coal sample ground 55 orders, obtains the Firing Shenhua Coal ash sample;

Step 2: measure the grey melt temperature of Firing Shenhua Coal ash sample, namely obtain coal ash texturing temperature, coal ash softening temperature, coal ash hemispherical temperature and coal ash yield temperature;

The grey melt temperature of the Firing Shenhua Coal ash sample that record this moment is as shown in table 1:

	The coal ash texturing temperature	The coal ash softening temperature	The coal ash hemispherical temperature	The coal ash yield temperature
					The standard coal ash sample	1100℃	1120℃	1130℃	1130℃

Table 1

Step 3: sampling obtains Firing Shenhua Coal sample 20 grams in Firing Shenhua Coal, Firing Shenhua Coal sample and Wingdale are uniformly mixed into mixture according to 99: 1 ratio of mass ratio, carry out ashing after this mixture ground 55 orders, obtain the Firing Shenhua Coal ash sample of Wingdale additive, measure the grey melt temperature that this has the Firing Shenhua Coal ash sample of Wingdale additive, and and step 2 in the grey melt temperature of the Firing Shenhua Coal ash sample measured compare item by item, the coal ash texturing temperature of namely measuring in corresponding comparison and the step 2, the coal ash softening temperature, coal ash hemispherical temperature and coal ash yield temperature are tried to achieve its difference, and difference obtains the mean value that grey melt temperature increases divided by 4;

The grey melt temperature of the Firing Shenhua Coal ash sample that record this moment is as shown in table 2, and the mean value that grey melt temperature increases is 50 ℃:

Table 2

Step 4: sampling obtains Firing Shenhua Coal sample 20 grams in Firing Shenhua Coal, Firing Shenhua Coal sample and Wingdale are uniformly mixed into mixture, wherein the mass ratio of Wingdale increases by 2% than step 3, carry out ashing after this mixture ground 55 orders, obtain the Firing Shenhua Coal ash sample of Wingdale additive, measure the grey melt temperature that this has the Firing Shenhua Coal ash sample of Wingdale additive, and and the grey melt temperature measured last time compare item by item, the coal ash texturing temperature of namely measuring relatively corresponding and last time, the coal ash softening temperature, coal ash hemispherical temperature and coal ash yield temperature are tried to achieve its difference, and difference obtains the mean value that grey melt temperature increases divided by 4;

Step 5: if the mean value that double grey melt temperature increases is below 30 ℃, need to determine between the minimum value and maximum value of mass ratio range for the mass ratio of this twice corresponding Wingdale that relatively adds of the Wingdale additive in the Firing Shenhua Coal of additive, finally needing the mass ratio range of the Wingdale additive in the Firing Shenhua Coal of additive is 5-9%, present embodiment is chosen the mass ratio 8% of a Wingdale in this value range, evenly mixes according to mass ratio and the Firing Shenhua Coal of this Wingdale of choosing; If the mean value that double grey melt temperature increases is greater than 30 ℃, repeated execution of steps 4.

The grey melt temperature of each time interpolation this moment Wingdale additive gained is as shown in table 3, and the mass ratio of Shenhua coal ash and Wingdale is 97: 3 o'clock, and the mean value that grey melt temperature increases is 67.5 ℃; The mass ratio of Shenhua coal ash and Wingdale is 95: 5 o'clock, and the mean value that grey melt temperature increases is 150 ℃; The mass ratio of Shenhua coal ash and Wingdale is 93: 7 o'clock, and the mean value that grey melt temperature increases is 5 ℃; The mass ratio of Shenhua coal ash and Wingdale is 91: 9 o'clock, and the mean value that grey melt temperature increases is 2.5 ℃.

Table 3

Need among this embodiment determining thus the mass ratio range of the Wingdale additive in the Firing Shenhua Coal of additive is 5-9%, choose the mass ratio 8% of a Wingdale in this value range, mass ratio and Firing Shenhua Coal according to this Wingdale of choosing are evenly mixed, so just determine to reach the purpose of the scope that improves Firing Shenhua Coal ash fusibility temperature by the ratio of progressively adding Wingdale in the Shenhua coal ash, thereby alleviate the slagging scorification of the boiler that uses Firing Shenhua Coal, Wingdale does not have corrosive nature to metal parts on the boiler in addition, has eliminated the corrosive nature of sodium salt and sylvite to the factor of the dangerous operation of boiler.

Obviously, those of ordinary skill in the art can with a kind of Wingdale that utilizes of the present invention as the method for additive raising coal ash melting temperature, consist of the method for various types of raising coal ash melting temperatures.

Above-described embodiment is only for explanation the present invention's; and be not to be limitation of the present invention; the those of ordinary skill in relevant technologies field; without departing from the present invention; can also make various variations and modification; therefore all technical schemes that are equal to also should belong to category of the present invention, and scope of patent protection of the present invention should be limited by each claim.

Claims

1. a method utilizing limestone to improve coal ash melting temperature as additive, is characterized in that: described method comprises the steps:

Step 1: Take a sample from the raw coal that needs additives to obtain a coal sample, grind the coal sample to a size below 60 mesh, and then ash it to obtain a standard coal ash sample;

Step 2: measure the ash melting temperature of the standard coal ash sample, namely obtain the coal ash deformation temperature, coal ash softening temperature, coal ash hemispherical temperature and coal ash flow temperature;

Step 3: uniformly mix the standard coal sample and limestone into a mixture according to the mass ratio of 99:1, grind the mixture to below 60 mesh, and then ash to obtain the coal ash sample to be tested containing limestone additives, and measure the mixture to be tested. Measure the ash fusion temperature of the coal ash sample, and compare with the ash fusion temperature of the standard coal ash sample measured in step 2;

Step 4: According to the method of step 3, the mass ratio of limestone is increased by 2% compared with step 3, and the corresponding mixture is ground to below 60 mesh and then ashed, and then the ash fusion temperature of the coal ash sample to be tested is measured, And compare with the ash fusion temperature of the coal ash sample measured in step 3;

Step 5: If the average value of the increase of the ash fusion temperature for two consecutive times is below 30°C, determine the mass proportion range of the limestone additive to be between the minimum value and the maximum value of the mass proportion of the limestone added for the two corresponding comparisons; if the continuous If the average value of the two ash melting temperature increases is greater than 30°C, repeat step 4;

In said step 3, the ash fusion temperature of the coal ash sample containing the limestone additive is compared item by item with the ash fusion temperature of the coal ash sample measured in step 2, that is, the coal ash deformation measured respectively in step 2 and step 3 The temperature, coal ash softening temperature, coal ash hemisphere temperature and coal ash flow temperature are compared accordingly, and the difference of each temperature is obtained, and the difference is summed and divided by 4 to obtain the average value of the increase of ash melting temperature.

2. The method for increasing the melting temperature of coal ash according to claim 1, characterized in that: the raw coal is Shenhua coal, and limestone with a mass ratio range of 5-9% is added to the raw coal as an additive.