CN114307571A - Novel carbide slag slurry supply system and method - Google Patents
Novel carbide slag slurry supply system and method Download PDFInfo
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- CN114307571A CN114307571A CN202111418729.7A CN202111418729A CN114307571A CN 114307571 A CN114307571 A CN 114307571A CN 202111418729 A CN202111418729 A CN 202111418729A CN 114307571 A CN114307571 A CN 114307571A
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Abstract
The invention relates to a novel carbide slag slurry supply system, which comprises an absorption tower, a carbide slag slurry supply tank, a slurry supply pump, a slurry supply pipeline, a return pipeline, a filtrate water pipeline, an absorption tower PH meter, a slurry supply densimeter, a diluted slurry flowmeter and a diluted slurry regulating valve, wherein the carbide slag slurry supply pipeline, the filtrate water pipeline and the return pipeline are connected to the top of the carbide slag slurry supply tank and serve as a desulfurizer preparation source; the outlet of the carbide slag slurry supply tank is provided with a slurry supply pump and a slurry dilution flowmeter, and the slurry supply pump and the slurry dilution flowmeter are connected to the absorption tower through the slurry supply pipeline; when the absorption tower is supplemented with the carbide slag to dilute the slurry, the flow of the slurry supply pipeline is adjusted through the adjusting valve, so that the slurry supply adjusting characteristic of the absorption tower is realized; the invention has the advantages of reasonable structure, simple operation, accurate control, stability and effectiveness.
Description
Technical Field
The invention belongs to the technical field of carbide slag treatment, and particularly relates to a novel carbide slag slurry supply system and method.
Background
The carbide slag is waste slag which is obtained by hydrolyzing carbide to obtain acetylene gas and takes calcium hydroxide as a main component, most of the existing desulphurization methods for the carbide slag are wet desulphurization, the wet desulphurization accounts for more than 92% of a flue gas desulphurization process, and the wet desulphurization process is widely applied to industries such as electric power, steel and the like. Lime, limestone and the like are conventionally used as desulfurizing agents in wet desulfurization, and carbide slag is used as industrial waste slag in industries of papermaking, alkali preparation and the like, so that a large amount of stable yield is achieved every year, and carbide slag slurry with high purity mainly becomes Ca (OH)2Can be used as a desulfurizer, so that the carbide slag tends to be widely applied in the substitution of the wet desulphurization industry. The existing conventional slurry preparation and supply mode of carbide slag prepares slurry with solid content of about 20-30% by mixing the carbide slag with water and supplements the slurry into an absorption tower, however, the main component of the carbide slag is Ca (OH)2Can be rapidly mixed with SO in the absorption tower2The reaction generates calcium sulfite, SO that the pH value in the absorption tower is greatly influenced by the slurry supply amount, great difficulty is brought to the control of parameters of the absorption tower, meanwhile, the continuous too high pH value can cause the oxidation effect of the calcium sulfite in the absorption tower to be poor, the quality of gypsum is finally poor, the consumption of the desulfurizer is large, and the too low pH value has the problem that a chimney discharges SO2The value exceeds the standard, so the carbide slag as a desulfurizer has the defects of unstable slurry supply amount and large fluctuation of absorption tower parameters in long-term operation, and the carbide slag is not beneficial to maintaining the water balance of a desulfurization system by utilizing clear water for pulping; therefore, it is necessary to provide a novel carbide slag slurry supply system and method which are reasonable in structure, simple in operation, accurate in control, stable and effective.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel carbide slag slurry supply system and method which are reasonable in structure, simple to operate, accurate to control, stable and effective.
The purpose of the invention is realized as follows: a novel carbide slag slurry supply system comprises an absorption tower, a carbide slag slurry supply tank, a slurry supply pump, a slurry supply pipeline, a return pipeline, a filtrate water pipeline, an absorption tower PH meter, a slurry supply densimeter, a diluted slurry flowmeter and a diluted slurry regulating valve, wherein the carbide slag slurry supply pipeline, the filtrate water pipeline and the return pipeline are connected to the top of the carbide slag slurry supply tank and used as a desulfurizer preparation source; the outlet of the carbide slag slurry supply tank is provided with a slurry supply pump and a slurry dilution flowmeter, and the slurry supply pump and the slurry dilution flowmeter are connected to the absorption tower through the slurry supply pipeline; when the absorption tower is supplemented with the carbide slag to dilute the slurry, the flow of the slurry supply pipeline is adjusted through the adjusting valve, so that the slurry supply adjusting characteristic of the absorption tower is realized.
Under the operation condition of the absorption tower, in the reaction process of the carbide slag slurry and the flue gas, the pH meter 7 of the absorption tower reflects the matching condition of carbide slag slurry supply in the absorption tower, the pH value is maintained in a reasonable range of 4.8-6.2 under the conventional condition, the high or low pH value indicates that the slurry supply concentration deviation is large, and the slurry supply concentration deviation is large along with the load or SO in the flue gas2Concentration fluctuation and insufficient slurry supply stability can cause the problems of increased consumption of the desulfurizer, even incapability of reaching the standard of flue gas emission and the like caused by excessive slurry supply. When the pH value exceeds 6.2 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly increasing the flow rate on the premise of ensuring the material balance, and the stable supplement of the carbide slag slurry is realized under the variable load working condition and the sulfur fluctuation working condition; when the pH value is lower than 4.8 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly reducing the slurry supply flow on the premise of ensuring material balance, and the stable supplement of the carbide slag slurry is realized under the variable load working condition and the sulfur fluctuation working condition.
An operation method of a novel carbide slag slurry supply system comprises the following steps:
s1, a carbide slag slurry supply box, a slurry supply pump, a diluted slurry flowmeter and a return pipeline are arranged in a slurry supply system of the absorption tower, and the flow of the slurry supply is adjusted on line.
S2, introducing filter liquor and filter liquor water of an absorption tower dehydration system as desulfurizer preparation water to replace original process water to realize cascade water use.
S3, the carbide slag slurry is taken from a carbide slag supply pipeline by the carbide slag slurry supply tank, the water supplement of the carbide slag slurry supply tank is taken from a filtrate water pipeline, and the density rho of the carbide slag supply pipeline is determined according to0And flue gas parameters, and calculating to obtain the basic slurry supply amount q when no filtrate water is replenished according to a material balance method0The calculation method is as follows:
wherein:
q0┄ basic stock supply, m3/h
c1┄ original flue gas SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
c2┄ outlet SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
Flue gas volume m of Q ┄ unit3H, (standard, dry basis, 6 for% O)2）
ρ0┄ carbide slag slurry density (unit: kg/m)3）
According to rho0The solid content of the corresponding carbide slag slurry was calculated as (unit:%)
Note: the calcium-sulfur ratio is 1.05, and the purity of the carbide slag is 90 percent.
S4, when the flue gas parameter (original flue gas SO)2Concentration, outlet SO2Concentration and unit flue gas amount) fluctuation, reasonable slurry supply amount can be calculated and adjusted according to a calculation formula in time, and the problem of SO (sulfur oxide) at an outlet is avoided2And the outlet discharge index exceeds the standard due to the slow pH value feedback of the absorption tower.
S5, constructing carbide slag slurry supply feedback logic, namely setting the pH value range of 4.8-6.2, and starting filtrate water to supplement carbide slag when the pH value fluctuation exceeds the set range during slurry supply according to material balanceThe slurry supply tank achieves the purpose of diluting the carbide slag slurry, the absolute amount of calcium hydroxide calculated according to material balance is not changed, and the diluted slurry supply flow q is obtained by supplementing filter liquor water to reduce the density of the carbide slag slurry1The disturbance of the PH value is reduced while stable slurry supply is realized; meanwhile, the method can effectively improve the regulation precision of the slurry supply flow under the working conditions of low load and low sulfur content, and ensure the stability of the slurry supply system.
The invention has the beneficial effects that: the method performs slurry supply flow control based on material balance by using filtrate water for pulping, and realizes stable control and accurate adjustment of slurry supply flow; the invention has the advantages of reasonable structure, simple operation, accurate control, stability and effectiveness.
Drawings
Fig. 1 is a schematic structural diagram of a novel carbide slag slurry supply system according to the invention.
In the figure: 1. absorption tower 2, carbide slag supply thick liquid case 3, supply thick liquid pump 4, supply thick liquid pipeline 5, return line 6, filtrating water pipeline 7, absorption tower PH meter 8, dilute thick liquid densimeter 9, dilute thick liquid flowmeter 10, governing valve 11, carbide slag thick liquid densimeter 12, carbide slag supply thick liquid pipeline.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1, a novel carbide slag slurry supply system comprises an absorption tower 1, a carbide slag slurry supply tank 2, a slurry supply pump 3, a slurry supply pipeline 4, a return pipeline 5, a filtrate water pipeline 6, an absorption tower PH meter 7, a diluted slurry densimeter 8, a diluted slurry flowmeter 9 and a regulating valve 10, wherein the carbide slag slurry supply pipeline 12, the filtrate water pipeline 6 and the return pipeline 5 are connected to the top of the carbide slag slurry supply tank 2 and serve as a desulfurizer preparation source, the carbide slag slurry supply pipeline 12 is provided with the carbide slag slurry densimeter 11, and the return pipeline 5 is provided with the diluted slurry densimeter 8; the outlet of the carbide slag slurry supply tank 2 is provided with a slurry supply pump 3 and a slurry dilution flowmeter 9, and the carbide slag slurry supply tank is connected to the absorption tower 1 through the slurry supply pipeline 4; when the absorption tower 1 is supplemented with the carbide slag to dilute the slurry, the flow of the slurry supply pipeline is adjusted through the adjusting valve 10, so that the slurry supply adjusting characteristic of the absorption tower 1 is realized.
Under the operation condition of the absorption tower, in the reaction process of the carbide slag slurry and the flue gas, the pH meter 7 of the absorption tower reflects the matching condition of carbide slag slurry supply in the absorption tower, the pH value is maintained in a reasonable range of 4.8-6.2 under the conventional condition, the high or low pH value indicates that the slurry supply concentration deviation is large, and the slurry supply concentration deviation is large along with the load or SO in the flue gas2Concentration fluctuation and insufficient slurry supply stability can cause the problems of increased consumption of the desulfurizer, even incapability of reaching the standard of flue gas emission and the like caused by excessive slurry supply. When the pH value exceeds 6.2 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly increasing the flow rate on the premise of ensuring the material balance, and the stable supplement of the carbide slag slurry is realized under the variable load working condition and the sulfur fluctuation working condition; when the pH value is lower than 4.8 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly reducing the slurry supply flow on the premise of ensuring the material balance, so that the stable supplement of the carbide slag slurry is realized under the variable load working condition and the sulfur fluctuation working condition
An operation method of a novel carbide slag slurry supply system comprises the following steps:
s1, a carbide slag slurry supply box, a slurry supply pump, a diluted slurry flowmeter and a return pipeline are arranged in a slurry supply system of the absorption tower, and the flow of the slurry supply is adjusted on line.
S2, introducing filter liquor and filter liquor water of an absorption tower dehydration system as desulfurizer preparation water to replace original process water to realize cascade water use.
S3, the carbide slag slurry is taken from a carbide slag supply pipeline by the carbide slag slurry supply tank, the water supplement of the carbide slag slurry supply tank is taken from a filtrate water pipeline, and the density rho of the carbide slag supply pipeline is determined according to0And flue gas parameters, and calculating to obtain the basic slurry supply amount q when no filtrate water is replenished according to a material balance method0The calculation method is as follows:
wherein:
q0┄ basic stock supply, m3/h
c1┄ original flue gas SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
c2┄ outlet SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
Flue gas volume m of Q ┄ unit3H, (standard, dry basis, 6 for% O)2）
ρ0┄ carbide slag slurry density (unit: kg/m)3）
According to rho0The solid content of the corresponding carbide slag slurry was calculated as (unit:%)
Note: the calcium-sulfur ratio is 1.05, and the purity of the carbide slag is 90 percent.
S4, when the flue gas parameter (original flue gas SO)2Concentration, outlet SO2Concentration and unit flue gas amount) fluctuation, reasonable slurry supply amount can be calculated and adjusted according to a calculation formula in time, and the problem of SO (sulfur oxide) at an outlet is avoided2And the outlet discharge index exceeds the standard due to the slow pH value feedback of the absorption tower.
S5, constructing carbide slag slurry supply feedback logic, namely setting the PH value range to be 4.8-6.2, starting filtrate water to supplement a carbide slag slurry supply box to dilute carbide slag slurry when the PH value fluctuation exceeds the set range during slurry supply according to material balance, wherein the absolute amount of calcium hydroxide calculated according to material balance is unchanged, and the diluted slurry supply flow q is obtained by supplementing the filtrate water to reduce the density of the carbide slag slurry1The disturbance of the PH value is reduced while stable slurry supply is realized; meanwhile, the method can effectively improve the regulation precision of the slurry supply flow under the working conditions of low load and low sulfur content, and ensure the stability of the slurry supply system; the invention has the advantages of reasonable structure, simple operation, accurate control, stability and effectiveness.
Claims (3)
1. The utility model provides a novel carbide slag supplies thick liquid system, it includes absorption tower, carbide slag supplies thick liquid case, supplies the stuff pump, supplies thick liquid pipeline, return line, filtrating water pipeline, absorption tower PH meter, supplies thick liquid densimeter, dilutes thick liquid flowmeter, dilutes thick liquid governing valve, it includes, its characterized in that: the carbide slag slurry supply pipeline, the filtrate water pipeline and the return pipeline are connected to the top of the carbide slag slurry supply box and serve as a desulfurizer preparation source, the carbide slag slurry supply pipeline is provided with a carbide slag slurry densimeter, and the return pipeline is provided with a diluted slurry densimeter; the outlet of the carbide slag slurry supply tank is provided with a slurry supply pump and a slurry dilution flowmeter, and the slurry supply pump and the slurry dilution flowmeter are connected to the absorption tower through the slurry supply pipeline; when the absorption tower is supplemented with the carbide slag to dilute the slurry, the flow of the slurry supply pipeline is adjusted through the adjusting valve, so that the slurry supply adjusting characteristic of the absorption tower is realized.
2. The novel carbide slag slurry supply system according to claim 1, wherein: under the operation condition of the absorption tower, in the reaction process of the carbide slag slurry and the flue gas, the pH meter 7 of the absorption tower reflects the matching condition of carbide slag slurry supply in the absorption tower, the pH value is maintained in a reasonable range of 4.8-6.2 under the conventional condition, the high or low pH value indicates that the slurry supply concentration deviation is large, and the slurry supply concentration deviation is large along with the load or SO in the flue gas2When the pH value exceeds 6.2 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly increasing the flow rate on the premise of ensuring material balance, and the stable supplement of carbide slag slurry is realized under the working conditions of variable load and sulfur fluctuation; when the pH value is lower than 4.8 and the fluctuation is large, the desulfurizer can be supplemented in a mode of reducing the slurry supply density and properly reducing the slurry supply flow on the premise of ensuring material balance, and the stable supplement of the carbide slag slurry is realized under the variable load working condition and the sulfur fluctuation working condition.
3. The method of operating a novel carbide slag slurry supply system according to claim 1, wherein: the method comprises the following steps:
s1, arranging a carbide slag slurry supply box, a slurry supply pump, a diluted slurry flowmeter and a return pipeline in a slurry supply system of an absorption tower, and adjusting the flow of the slurry supply on line;
s2, introducing filter liquor and filter liquor water of a dehydration system of the absorption tower as desulfurizer preparation water to replace original process water to realize cascade water use;
s3, taking carbide slag slurry from a carbide slag supply pipeline of the carbide slag slurry supply tank, taking water supplement from a filtrate water pipeline of the carbide slag slurry supply tank, and calculating to obtain a basic slurry supply amount q0 when no filtrate water is supplemented according to density rho 0 of the carbide slag supply pipeline and a smoke gas parameter and a material balance method, wherein the calculation method comprises the following steps:
wherein:
q0┄ basic stock supply, m3/h
c1┄ original flue gas SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
c2┄ outlet SO2Concentration, mg/m3(standard, dry basis, 6% O)2）
Flue gas volume m of Q ┄ unit3H, (standard, dry basis, 6 for% O)2）
ρ0┄ carbide slag slurry density (unit: kg/m)3）
The solid content of the corresponding carbide slag slurry is calculated according to rho 0 and is (unit:%)
Note: the calcium-sulfur ratio is 1.05, and the purity of the carbide slag is 90 percent and is calculated;
s4, when the flue gas parameter (original flue gas SO)2Concentration, outlet SO2Concentration and unit flue gas volume), reasonable slurry supply amount can be calculated in time according to a calculation formula and adjusted, and excessive outlet discharge indexes caused by slow feedback of the outlet SO2 and the pH value of the absorption tower are avoided;
s5, constructing carbide slag slurry supply feedback logic, namely setting the PH value range to be 4.8-6.2, starting filtrate water to supplement a carbide slag slurry supply box to dilute carbide slag slurry when the PH value fluctuation exceeds the set range during slurry supply according to material balance, wherein the absolute amount of calcium hydroxide calculated according to material balance is unchanged, and the diluted slurry supply is obtained in a mode of reducing the density of the carbide slag slurry by supplementing the filtrate waterFlow rate q of slurry1The disturbance of the PH value is reduced while stable slurry supply is realized; meanwhile, the method can effectively improve the regulation precision of the slurry supply flow under the working conditions of low load and low sulfur content, and ensure the stability of the slurry supply system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115970476A (en) * | 2023-01-16 | 2023-04-18 | 西安热工研究院有限公司 | Automatic slurry supply control method for desulfurization island based on DCS control system |
| CN115970476B (en) * | 2023-01-16 | 2024-06-11 | 西安热工研究院有限公司 | Automatic slurry supply control method for desulfurization island based on DCS control system |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115970476A (en) * | 2023-01-16 | 2023-04-18 | 西安热工研究院有限公司 | Automatic slurry supply control method for desulfurization island based on DCS control system |
| CN115970476B (en) * | 2023-01-16 | 2024-06-11 | 西安热工研究院有限公司 | Automatic slurry supply control method for desulfurization island based on DCS control system |
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Application publication date: 20220412 |