CN112625763B

CN112625763B - Coke oven gas desulfurization process

Info

Publication number: CN112625763B
Application number: CN202011377044.8A
Authority: CN
Inventors: 刘卫军
Original assignee: Wuhai West Coal Chemical Co ltd
Current assignee: Wuhai West Coal Chemical Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-10-01
Anticipated expiration: 2040-11-30
Also published as: CN112625763A

Abstract

The invention relates to a coke oven gas desulfurization process, which comprises the following steps: step one, preparing a desulfurization solution and adding the desulfurization solution into a desulfurization tower; secondly, hydrogen sulfide in the desulfurization solution absorption tower forms mixed solution; opening a first control valve to enable the mixed liquid to flow out of the bottom of the desulfurization tower, enter a rich liquid tank, and then be pressurized by a rich liquid pump and then be injected into an ejector; enabling mixed liquor and air discharged by a tail pipe of the ejector to flow into the bottom of the regeneration tank in a parallel mode and flow upwards, and floating sulfur particles in the mixed liquor to form sulfur foam and clear liquid after air flotation; step five, opening a liquid level regulating valve to enable the clear liquid to enter a barren liquor tank, pressurizing the clear liquid by a barren liquor pump, and then pumping the clear liquid into a desulfurizing tower to be used as desulfurizing liquid; and step six, opening a second control valve to enable sulfur foam to flow into a foam tank and be pumped into a sulfur melting kettle through a foam pump to melt sulfur. Therefore, the invention improves the speed of absorbing hydrogen sulfide by the desulfurization solution, and the desulfurization solution can be recycled, thereby reducing the environmental pollution and the resource consumption.

Description

Coke oven gas desulfurization process

Technical Field

The invention relates to the field of coke oven gas purification, in particular to a coke oven gas desulfurization process.

Background

China is the country with the largest coke yield in the world, 350-400m3 coke oven gas can be generated according to 1t coke making, and the annual production of the coke oven gas reaches 186Gm 3. The coke oven gas has wide application and can be used as a raw material for synthesizing ammonia, methanol, natural gas and the like. The coke oven gas contains inorganic sulfur and organic sulfur, wherein the main component of the inorganic sulfur is hydrogen sulfide, the main component of the organic sulfur mainly comprises carbonyl sulfur, mercaptan, thioether, carbon disulfide and the like, the emission concentration of SO2 in the current 'comprehensive emission standard of atmospheric pollutants' is less than 100mg/Nm3, and the national ultra-low standard is 50mg/Nm3, SO the coke oven gas is subjected to rough desulfurization and fine desulfurization treatment before being utilized to remove the inorganic sulfur and the organic sulfur SO as to reduce the emission of SO2 of downstream users.

At present, some domestic coking plants adopt an improved ADA wet oxidation desulfurization process taking sodium carbonate as an alkali source, but the speed of absorbing hydrogen sulfide by desulfurization liquid is slow, and the desulfurization liquid cannot be recycled, and a certain amount of desulfurization waste liquid needs to be discharged every day, so that the environmental pollution is caused, and the resource consumption is high.

Disclosure of Invention

Therefore, the invention provides a coke oven gas desulfurization process which can effectively solve the technical problems in the prior art.

In order to achieve the aim, the invention provides a coke oven gas desulfurization process, which comprises the following steps:

adding a catalyst into a diluted sodium carbonate solution, uniformly mixing by using a stirrer to form a desulfurization solution, adding the desulfurization solution into a desulfurization tower, measuring the total alkalinity of the desulfurization solution in real time by using a first total alkalinity measuring instrument after adding the desulfurization solution into the desulfurization tower, and measuring the concentration of the desulfurization solution in real time by using a first concentration measuring instrument;

secondly, coke oven gas enters the tower from the bottom of the desulfurization tower and reversely contacts with desulfurization liquid in the tower, the desulfurization liquid absorbs hydrogen sulfide in the tower to form mixed liquid, in the process, a hydrogen sulfide detector is used for detecting the content of the hydrogen sulfide in the coke oven gas in real time, a second total alkalinity measuring instrument is used for measuring the total alkalinity of the mixed liquid in real time, a second concentration measuring instrument is used for measuring the concentration of the mixed liquid in real time, in the process of forming the mixed liquid, the central control module compares the content of the hydrogen sulfide with parameters in a preset hydrogen sulfide content matrix S0, and if the central control module judges that the comparison result does not accord with a first preset condition, the central control module controls the rising temperature of a first temperature regulating valve or controls the adding of a gas regulating valve to regulate the content of the hydrogen sulfide in the coal gas;

if the central control module judges that the comparison result meets a first preset condition, the central control module compares the total alkalinity of the mixed liquid with the total alkalinity of the preset mixed liquid, if the central control module judges that the comparison result does not meet a second preset condition, the central control module calculates the total alkalinity difference of the mixed liquid and compares the total alkalinity difference with the parameters in a preset mixed liquid total alkalinity difference matrix delta Jh0, and according to the comparison result, the central control module controls a gas regulating valve to add gas or controls a doctor solution regulating valve to add doctor solution to regulate the total alkalinity of the mixed liquid;

if the central control module judges that the comparison result meets a second preset condition, the central control module compares the concentration of the mixed liquid with the concentration of a preset mixed liquid, if the central control module judges that the comparison result does not meet a third preset condition, the central control module calculates the difference value of the mixed liquid and compares the difference value with the parameter in a preset mixed liquid concentration difference value matrix delta eta h0, and according to the comparison result, the central control module controls a coal gas regulating valve to add coal gas or controls a doctor solution regulating valve to add a doctor solution to regulate the concentration of the mixed liquid;

if the central control module judges that the comparison result meets a third preset condition, the central control module controls the desulfurization process to enter the next process;

opening a first control valve to enable the mixed liquid to flow out of the bottom of the desulfurization tower, enter a rich liquid tank, and then be pressurized by a rich liquid pump and then be injected into an ejector, wherein when the mixed liquid passes through an ejector nozzle, an ejector suction chamber forms negative pressure to automatically suck air, and the mixed liquid and the air flow in parallel sequentially through an ejector throat pipe and an ejector diffusion pipe and are finally discharged by an ejector tail pipe;

enabling mixed liquor and air discharged by a tail pipe of the ejector to flow upwards in a parallel flow mode, enabling suspended sulfur particles in the mixed liquor to be floated by the air to form sulfur foam and clear liquid, detecting the density of the sulfur foam in real time by using a density detector, measuring the total alkalinity of the clear liquid in real time by using a third total alkalinity measuring instrument, and measuring the concentration of the clear liquid in real time by using a third concentration measuring instrument;

step five, opening a liquid level regulating valve to enable the clear liquid to enter a lean liquid tank, pressurizing the clear liquid by a lean liquid pump, and then injecting the pressurized clear liquid into the desulfurizing tower to be used as desulfurizing liquid;

opening a second control valve to enable the sulfur foam to flow into a foam tank and be pumped into a sulfur melting kettle through a foam pump to melt sulfur;

the desulfurization tower and the regeneration tank are both connected with a central control module in a wireless manner, the central control module is used for controlling the whole desulfurization process, and a matrix is arranged in the central control module;

the central control module is further provided with a preset hydrogen sulfide content matrix S0(S1, S2, S3 and S4), wherein S1 represents a first preset hydrogen sulfide content, S2 represents a second preset hydrogen sulfide content, S3 represents a third preset hydrogen sulfide content, S4 represents a fourth preset hydrogen sulfide content, S1 is less than S2, S3 is less than S4;

the central control module is further provided with a preset gas adding quantity matrix Mm (Mm1, Mm2), wherein Mm1 represents a first preset gas adding quantity, and Mm2 represents a second preset gas adding quantity;

the central control module is also provided with a preset hydrogen sulfide content S0;

the hydrogen sulfide content measured by the hydrogen sulfide detector is S;

in the process of forming the mixed liquid in the second step, the central control module compares the hydrogen sulfide content S with the parameters in a preset hydrogen sulfide content matrix S0:

if S < S3 or S < S3, the central control module determines that the comparison result does not meet the first preset condition and further compares S with the parameters in the matrix S0,

if S is less than S1, the central control module controls the first temperature regulating valve to raise the temperature by Qsa amount, wherein Qsa is 4Q1+3Q2;

if S1 is not more than S < S2, the central control module controls the temperature of the first temperature adjusting valve to rise by Qsb, and Qsb is 2Q3+3Q4;

if S2 is not more than S < S3, the central control module controls the temperature of the first temperature adjusting valve to rise by Qsc, and Qsc is Qsa + Qsb;

if S is not more than S3 and is less than S4, the central control module controls the coal gas regulating valve to add coal gas with the quantity of Mm 1;

if S is larger than or equal to S4, the central control module controls the coal gas regulating valve to add coal gas with the quantity of Mm2;

and if the S is equal to S3, the central control module judges that the comparison result meets a first preset condition.

Further, the central control module is further provided with a preset mixed liquor total alkalinity difference matrix Δ Jh0(Δ Jh1, Δ Jh2, Δ Jh3, Δ Jh4), wherein Δ Jh1 represents a first difference of the total alkalinity of the preset mixed liquor, Δ Jh2 represents a second difference of the total alkalinity of the preset mixed liquor, Δ Jh3 represents a third difference of the total alkalinity of the preset mixed liquor, and Δ Jh4 represents a fourth difference of the total alkalinity of the preset mixed liquor;

the central control module is also provided with a desulfurization liquid adding matrix Ms (Ms1, Ms2,), wherein Ms1 represents a first desulfurization liquid adding amount, and Ms2 represents a second desulfurization liquid adding amount;

the central control module is provided with a preset total alkalinity Jt0 of the desulfurization solution;

the total alkalinity of the mixed liquid measured by the second total alkalinity measuring instrument is Jh;

when the central control module judges that the comparison result meets a first preset condition, the central control module compares the total alkalinity Jh of the mixed liquid with the total alkalinity Jh0 of the preset mixed liquid:

if Jh is less than Jh0, the central control module judges that the comparison result does not meet a second preset condition and calculates the total alkalinity difference value delta Jh of the mixed liquor, the delta Jh is Jh0-Jh, the delta Jh is compared with the parameters in a preset mixed liquor total alkalinity difference value matrix delta Jh0,

if the delta Jh is equal to the delta Jhi, and i is equal to 1,2, the central control module controls the coal gas regulating valve to add Mmi amount of coal gas;

if delta Jh is equal to delta Jhi, i is equal to 3,4, the central control module controls the doctor solution regulating valve to add doctor solution with the amount of Msi;

if the Jh is larger than or equal to Jh0, the central control module judges that the comparison result meets a second preset condition;

the calculation formula of the total alkalinity Jh0 of the preset mixed liquid is as follows:

Jh0＝Jt0×α；

wherein alpha represents the total alkalinity adjusting coefficient of the mixed liquid.

Further, the central control module is provided with a preset desulfurization liquid total alkalinity difference matrix delta Jt0 (delta Jt1, delta Jt2, delta Jt3 and delta Jt4), wherein delta Jt1 represents a first difference of the preset desulfurization liquid total alkalinity, delta Jt2 represents a second difference of the preset desulfurization liquid total alkalinity, delta Jt3 represents a third difference of the preset desulfurization liquid total alkalinity, delta Jt4 represents a fourth difference of the preset desulfurization liquid total alkalinity, and delta Jt1 is less than delta Jt2 and less than delta Jt3 and less than delta Jt 4;

the central control module is further provided with a preset mixed liquid concentration difference matrix delta eta h0 (delta eta h1, delta eta h2, delta eta h3 and delta eta h4), wherein delta eta h1 is 0.9 x delta eta t1 and represents a first difference of the preset mixed liquid concentration, delta eta h2 is 0.8 x delta eta t2 and represents a second difference of the preset mixed liquid concentration, delta eta h3 is 0.7 x delta eta t3 and represents a third difference of the preset mixed liquid concentration, and delta eta h4 is 0.6 x delta eta t4 and represents a fourth difference of the preset mixed liquid concentration;

the concentration of the mixed solution measured by the second concentration measuring instrument is η h;

when the central control module judges that a second preset condition is met, the central control module compares the mixed liquid concentration η h with a preset mixed liquid concentration η h 0:

if η h is less than η h0, the central control module judges that the comparison result does not meet a third preset condition, calculates a mixed liquid difference value Δ η h, wherein Δ η h is η h0- η h, compares Δ η h with parameters in a preset mixed liquid concentration difference matrix Δ η h0, and if Δ η h is Δ η h1, the central control module controls a gas regulating valve to add Mma amount of gas, and Mma is 4Mm1+3Mm 2; if the delta η h is equal to the delta η h2, the central control module controls the gas regulating valve to add Mmb amount of gas, and Mmb is equal to 3Mm1+2Mm2; if the delta eta h is equal to the delta eta h3, the central control module controls the desulfurization liquid regulating valve to add the desulfurization liquid with the amount of Msa, and the Msa is equal to 3Ms1+2Ms 2; if the delta eta h is equal to the delta eta h4, the central control module controls the desulfurization liquid regulating valve to add the desulfurization liquid with the amount of Msb, and the Msb is 5Ms1+4Ms 2;

if the eta h is larger than or equal to the eta h0, the central control module judges that the comparison result meets a third preset condition;

the calculation mode of the preset mixed liquid concentration η h0 is as follows:

ηh0＝β×ηt0；

wherein β represents a mixed liquid concentration adjustment coefficient.

Further, the central control module is also provided with a catalyst addition matrix Mc (Mc1, Mc2, Mc3, Mc4), wherein Mc1 represents a first catalyst addition, Mc2 represents a second catalyst addition, Mc3 represents a third catalyst addition, and Mc4 represents a fourth catalyst addition;

the central control module is also provided with a sodium carbonate solution adding matrix Mt (Mt1, Mt2, Mt3 and Mt4), wherein Mt1 represents a first adding amount of the sodium carbonate solution, Mt2 represents a second adding amount of the sodium carbonate solution, Mt3 represents a third adding amount of the sodium carbonate solution, and Mt4 represents a fourth adding amount of the sodium carbonate solution;

the total alkalinity of the desulfurization solution measured by the first total alkalinity measuring instrument is Jt;

after the desulfurization solution is added into the desulfurization tower in the step one, the central control module compares the total alkalinity Jt of the desulfurization solution with the total alkalinity Jt0 of the preset desulfurization solution:

if Jt ≠ Jt0, the central control module determines that the comparison result does not conform to the fourth preset condition and further compares Jt with Jt0,

if Jt is less than Jt0, the central control module calculates a first difference value delta Jta of the total alkalinity of the desulfurization solution, and delta Jta is equal to Jt0-Jt, compares the delta Jta with parameters in a preset difference matrix delta Jt0 of the total alkalinity of the desulfurization solution, and if delta Jta is less than delta Jt1, the central control module controls a first adjusting valve to add a catalyst with the amount of Mc 1; if the delta Jt1 is less than or equal to delta Jta and less than delta Jt2, the central control module controls the first regulating valve to add catalyst with the amount of Mc 2; if the delta Jt2 is less than or equal to delta Jta and less than delta Jt3, the central control module controls the first regulating valve to add catalyst with the amount of Mc 3; if the delta Jt3 is less than or equal to delta Jta and less than delta Jt4, the central control module controls the first regulating valve to add catalyst with the amount of Mc 4; if delta Jta is not less than delta Jt4, the central control module controls the first regulating valve to add the catalyst with the amount of Mc14, wherein Mc14 is Mc1+ Mc2+ Mc3+ Mc 14;

if Jt is more than Jt0, the central control module calculates a second difference value delta Jtb of the concentration of the desulfurization solution, and delta Jtb is equal to Jt-Jt0, compares the delta Jtb with parameters in a preset desulfurization solution total alkalinity difference matrix delta Jt0, and controls a second adjusting valve to add sodium carbonate solution with the amount of Mt1 if delta Jtb is less than delta Jt 1; if the delta Jt1 is less than or equal to delta Jtb and less than delta Jt2, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 2; if the delta Jt2 is less than or equal to delta Jtb and less than delta Jt3, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 3; if the delta Jt3 is less than or equal to delta Jtb and less than delta Jt4, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 4; if the delta Jtb is not less than or equal to delta Jt4, the central control module controls the second regulating valve to add sodium carbonate solution with the quantity of Mt12, wherein Mt12 is Mt1+ Mt 2;

if Jt is equal to Jt0, the central control module judges that the comparison result meets a fourth preset condition.

Further, the central control module is further provided with a preset doctor solution concentration difference matrix Δ η t0(Δ η t1, Δ η t2, Δ η t3 and Δ η t4), wherein Δ η t1 represents a first difference of preset doctor solution concentration, Δ η t2 represents a second difference of preset doctor solution concentration, Δ η t3 represents a third difference of preset doctor solution concentration, and Δ η t4 represents a fourth difference of preset doctor solution concentration;

the central control module is also provided with a temperature regulating quantity matrix Q (Q1, Q2, Q3 and Q4), wherein Q1 represents a first temperature regulating quantity, Q2 represents a second temperature regulating quantity, Q3 represents a third temperature regulating quantity, and Q4 represents a fourth temperature regulating quantity;

the central control module is also provided with a preset doctor solution concentration eta t 0;

the concentration of the desulfurization solution measured by the first concentration measuring instrument is eta t;

when the central control module judges that the comparison result meets a fourth preset condition, the central control module compares the concentration eta t of the desulfurization solution with a preset concentration eta t0 of the desulfurization solution:

if η t is not equal to η t0, the central control module determines that the comparison result does not meet the fifth preset condition and further compares η t with η t0,

if eta t is less than eta t0, the central control module calculates a first difference delta eta ta of the concentration of the doctor solution, the delta eta is eta t 0-eta t, the delta eta ta is compared with parameters in a preset doctor solution concentration difference matrix delta eta t0, and if the delta eta is delta eta ti, i is 1,2,3 and 4, the central control module controls the first temperature regulating valve to reduce the temperature of Qi quantity;

if eta t is more than eta t0, the central control module calculates a second difference delta eta tb of the doctor solution concentration, the delta eta tb is eta t-eta t0, the delta eta tb is compared with parameters in a preset doctor solution concentration difference matrix delta eta t0, and if the delta eta tb is delta eta ti, i is 1,2,3 and 4, the central control module controls the first temperature adjusting valve to increase the temperature by Qi;

and if the eta t is equal to the eta t0, the central control module judges that the comparison result meets a fifth preset condition.

Further, the central control module is further provided with a preset sulfur foam density difference interval matrix delta ρ 0 (delta ρ 1, delta ρ 2, delta ρ 3, delta ρ 4), wherein the delta ρ 1 represents a first difference interval of the preset sulfur foam density, the delta ρ 2 represents a second difference interval of the preset sulfur foam density, the delta ρ 3 represents a third difference interval of the preset sulfur foam density, and the delta ρ 4 represents a fourth difference interval of the preset sulfur foam density;

the central control module is further provided with an air addition matrix Mk (Mk1, Mk2, Mk3 and Mk4), wherein Mk1 represents a first addition of air, Mk2 represents a second addition of air, Mk3 represents a third addition of air, and Mk4 represents a fourth addition of air;

the central control module is also provided with a preset sulfur foam density rho 0;

the density of the sulfur foam measured by the density detector is rho;

after the suspended sulfur particles in the mixed solution in the step four are subjected to air flotation, the central control module compares the sulfur foam density rho with a preset sulfur foam density rho 0:

if rho is less than rho 0, the central control module judges that the comparison result does not meet a sixth preset condition and calculates a sulfur foam difference value delta rho, after the calculation is finished, the central control module matches the delta rho with parameters in a preset sulfur foam density difference value interval matrix delta rho 0, if the delta rho is in the range of delta rho i, i is 1,2,3 and 4, and the central control module controls an air suction chamber regulating valve to add air with Mki quantity;

if rho is larger than or equal to rho 0, the central control module judges that the comparison result meets a sixth preset condition;

the sulfur foam difference value Deltarho is calculated according to the following formula:

△ρ＝δ×(ρ0-ρ)；

where δ represents a sulfur foam difference coefficient.

Further, the central control module is further provided with a preset clear liquid total alkalinity difference matrix delta Jq0 (delta Jq1, delta Jq2, delta Jq3, delta Jq4), wherein delta Jq1 represents a first difference of the preset clear liquid total alkalinity, delta Jq2 represents a second difference of the preset clear liquid total alkalinity, delta Jq3 represents a third difference of the preset clear liquid total alkalinity, and delta Jq4 represents a fourth difference of the preset clear liquid total alkalinity;

the central control module is further provided with a mixed liquor addition matrix Mh (Mh1, Mh2, Mh3 and Mh4), wherein Mh1 represents a first added quantity of the mixed liquor, Mh2 represents a second added quantity of the mixed liquor, Mh3 represents a third added quantity of the mixed liquor, and Mh4 represents a fourth added quantity of the mixed liquor;

the total alkalinity of the clear liquid measured by the third total alkalinity measuring instrument is Jq;

when the central control module judges that the comparison result meets a sixth preset condition, the central control module compares the total alkalinity Jq of the clear liquid with the preset total alkalinity Jq0 of the clear liquid:

if Jq is less than Jq0, the central control module judges that the comparison result does not meet a seventh preset condition, calculates a clear liquid total alkalinity difference value delta Jq, and compares the delta Jq with parameters in a preset clear liquid total alkalinity difference matrix delta Jq0, and if the delta Jq is equal to delta Jqi, i is equal to 1,2,3 and 4, the central control module controls the first adjusting valve to add mixed liquid with the quantity of Mhi;

if the Jq is larger than or equal to Jq0, the central control module judges that the comparison result meets a seventh preset condition;

the calculation formula of the total alkalinity Jq0 of the preset clear liquid is as follows:

Jq0＝Φ×Jh0；

wherein phi represents the adjustment coefficient of the total alkalinity of the clear liquid.

Further, the central control module is further provided with a preset clear liquid concentration difference matrix delta eta q0 (delta eta q1, delta eta q2, delta eta q3 and delta eta q4), wherein delta eta q1 represents a first difference of preset clear liquid concentration, delta eta q2 represents a second difference of preset clear liquid concentration, delta eta q3 represents a third difference of preset clear liquid concentration, and delta eta q4 represents a fourth difference of preset clear liquid concentration;

the concentration of the clear liquid measured by the third concentration measuring instrument is eta q;

when the central control module judges that the comparison result meets a seventh preset condition, the central control module compares the clear liquid concentration eta q with a preset clear liquid concentration eta q 0:

if η q is not equal to η q0, the central control module determines that the comparison result does not meet the eighth preset condition and further compares η q with η q0,

if eta q is less than eta q0, the central control module calculates a first difference delta eta qa of the clear liquid concentration, the delta eta qa is eta q 0-eta q plus delta eta ta, and compares the delta eta qa with parameters in a preset clear liquid concentration difference matrix delta eta q0, if the delta eta qa is delta eta Qi, i is 1,2,3,4, the central control module controls a second temperature regulating valve to reduce the temperature of the Qai amount, and the Qai is 3 Qi;

if eta q is more than eta q0, the central control module calculates a second difference delta eta qb of the concentration of the clear liquid, the delta eta qb is eta q-eta q0 plus delta eta tb, and compares the delta eta qb with parameters in a preset doctor solution concentration difference matrix delta eta q0, if the delta eta qb is delta eta Qi, i is 1,2,3 and 4, the central control module controls the second temperature regulating valve to raise the temperature of Qbi, and Qbi is 2 Qi;

if η t is equal to η t0, the central control module determines that the comparison result meets an eighth preset condition;

the calculation formula of the preset clear liquid concentration eta q0 is as follows:

ηq0＝γ×ηh0；

wherein γ represents a clear solution concentration adjustment coefficient.

Compared with the prior art, the method has the beneficial effects that the coke oven gas enters the tower from the bottom of the desulfurization tower and reversely contacts with the desulfurization solution in the tower, the desulfurization solution absorbs the hydrogen sulfide in the tower to form a mixed solution, in the process, a hydrogen sulfide detector is used for detecting the hydrogen sulfide content in the coke oven gas in real time, the central control module compares the hydrogen sulfide content with the parameters in a preset hydrogen sulfide content matrix S0, and if the central control module judges that the comparison result does not meet a first preset condition, the central control module controls the rising temperature of the first temperature regulating valve or controls the gas regulating valve to add the gas to regulate the hydrogen sulfide content; if the central control module judges that the comparison result meets the first preset condition, the central control module compares the total alkalinity of the mixed liquid with the total alkalinity of the preset mixed liquid, if the central control module judges that the comparison result does not meet the second preset condition, the central control module calculates the total alkalinity difference value of the mixed liquid and compares the total alkalinity difference value with the parameters in a preset mixed liquid total alkalinity difference matrix delta Jh0, and according to the comparison result, the central control module controls a coal gas regulating valve to add coal gas or controls a desulfurization liquid regulating valve to add desulfurization liquid so as to regulate the total alkalinity of the mixed liquid; if the central control module judges that the comparison result meets the second preset condition, the central control module compares the concentration of the mixed liquid with the concentration of the preset mixed liquid, if the central control module judges that the comparison result does not meet the third preset condition, the central control module calculates the difference value of the mixed liquid and compares the difference value with the parameter in the preset mixed liquid concentration difference matrix delta eta h0, and according to the comparison result, the central control module controls a coal gas regulating valve to add coal gas or controls a desulfurization liquid regulating valve to add desulfurization liquid so as to regulate the concentration of the mixed liquid; if the central control module judges that the comparison result meets a third preset condition, the central control module controls the desulfurization process to enter the next flow, then, opening the first control valve to enable the mixed liquid to flow out from the bottom of the desulfurizing tower, enter a rich liquid tank, pressurize by a rich liquid pump and then drive into an ejector, when the mixed liquid passes through a nozzle of the ejector, the ejector air suction chamber forms negative pressure to automatically suck air, the mixed liquid and the air flow in parallel and flow through the ejector throat pipe and the ejector diffusion pipe in sequence, and the mixed liquid is finally discharged from the ejector tail pipe, then the mixed liquor and air discharged from the tail pipe of the ejector flow into the bottom of the regeneration tank in parallel and flow upwards, suspended sulfur particles in the mixed liquor are floated by the air to form sulfur foam and clear liquid, then, the liquid level regulating valve is opened to make the clear liquid enter the barren liquor tank, and then the clear liquid is pressurized by a barren liquor pump and then is injected into a desulfurizing tower to be used as desulfurizing liquid, then, a second control valve is opened to enable the sulfur foam to flow into a foam tank and be pumped into a sulfur melting kettle through a foam pump to melt sulfur. Therefore, the content of the hydrogen sulfide can be adjusted by controlling the rising temperature of the first temperature adjusting valve, and the clear liquid is used as the desulfurization liquid, so that the speed of the desulfurization liquid for absorbing the hydrogen sulfide is increased, the desulfurization liquid can be recycled, and the environmental pollution and the resource consumption are reduced.

Drawings

FIG. 1 is a schematic structural diagram of a coke oven gas desulfurization device of the present invention;

FIG. 2 is a schematic flow chart of a coke oven gas desulfurization process according to the present invention;

the notation in the figure is: 1. a desulfurizing tower; 11. a first control valve; 12. a gas regulating valve; 13. a first regulating valve; 14. a second regulating valve; 15. a first temperature regulating valve; 16. a doctor solution regulating valve; 2. a pregnant solution tank; 21. a rich liquor pump; 3. an ejector; 31. an injector nozzle; 32. an injector suction chamber; 321. an air suction chamber regulating valve; 33. an ejector throat; 34. an injector diffuser tube; 35. an injector tail pipe; 4. a regeneration tank; 41. a liquid level regulating valve; 42. a second control valve; 5. a lean liquor tank; 51. a barren liquor pump; 6. a foam tank; 61. a foam pump; 7. a sulfur melting kettle.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a coke oven gas desulfurization device of the present invention, fig. 2 is a schematic flow diagram of a coke oven gas desulfurization process of the present invention, and the coke oven gas desulfurization device of the present embodiment includes:

the device comprises a desulfurizing tower 1, a rich solution tank 2 and an ejector 3, wherein the rich solution tank 2 is respectively connected with the desulfurizing tower 1 and the rich solution tank 2, the desulfurizing tower 1 is used for carrying out a desulfurizing reaction, and the rich solution tank 2 is used for conveying mixed liquid; the ejector 3 is used for carrying out desulfurization reaction;

a rich liquid pump 21 connected to the rich liquid tank 2 and the injector 3, respectively, for pumping the mixed liquid in the rich liquid tank 2 into the injector 3;

a lean liquid tank 5 connected to the regeneration tank 4, for pumping the clear liquid into the desulfurization tower 1 by a lean liquid pump 51;

a foam tank 6 connected with the regeneration tank 4 and used for pumping sulfur foam into a sulfur melting kettle 7 through a foam pump 61 for sulfur melting;

the desulfurization tower 1 is provided with a first control valve 11, a coal gas regulating valve 12, a first regulating valve 13, a second regulating valve 14, a first temperature regulating valve 15 and a desulfurization solution regulating valve 16, wherein the first control valve 11 is used for enabling mixed solution to flow into the rich liquor tank 2; the gas regulating valve 12 is used for regulating the amount of added gas; the first regulating valve 13 is used for regulating the amount of the added catalyst; the second regulating valve 14 is used for regulating the amount of the added sodium carbonate solution; the first temperature regulating valve 15 is used for regulating the temperature in the desulfurization tower 1; the desulfurization solution regulating valve 16 is used for regulating the amount of the desulfurization solution;

the ejector 3 is provided with an ejector nozzle 31, an ejector suction chamber 32, an ejector throat 33, an ejector diffuser 34 and an ejector tail pipe 35, the ejector nozzle 31 is used for receiving mixed liquid pumped by the liquid enrichment pump 21, the ejector suction chamber 32 is used for sucking air through a suction chamber regulating valve 321, and the ejector throat 33, the ejector diffuser 34 and the ejector tail pipe 35 are used for transporting the mixed liquid and the air;

the regeneration tank 4 is provided with a liquid level regulating valve 41 and a second control valve 42, and the liquid level regulating valve 41 is arranged at the bottom of the regeneration tank 4 so as to enable clear liquid to enter the lean liquid tank 5; the second control valve 42 is provided on the top side of the regeneration tank 4 to allow sulfur foam to flow into the foam tank 6.

Referring to fig. 1, based on the coke oven gas desulfurization device, the coke oven gas desulfurization process of the embodiment includes:

adding a catalyst into a diluted sodium carbonate solution, uniformly mixing by using a stirrer to form a desulfurization solution, adding the desulfurization solution into a desulfurization tower 1, adding the desulfurization solution into the desulfurization tower 1, measuring the total alkalinity of the desulfurization solution in real time by using a first total alkalinity measuring instrument, and measuring the concentration of the desulfurization solution in real time by using a first concentration measuring instrument;

the addition of the catalyst to the diluted sodium carbonate solution in the examples of the invention was carried out in a reactor;

secondly, coke oven gas enters the tower from the bottom of the desulfurizing tower 1 and reversely contacts with desulfurizing liquid in the tower, the desulfurizing liquid absorbs hydrogen sulfide in the tower to form mixed liquid, in the process, a hydrogen sulfide detector is used for detecting the content of the hydrogen sulfide in the coke oven gas in real time, a second total alkalinity measuring instrument is used for measuring the total alkalinity of the mixed liquid in real time, a second concentration measuring instrument is used for measuring the concentration of the mixed liquid in real time, in the process of forming the mixed liquid, the central control module compares the content of the hydrogen sulfide with parameters in a preset hydrogen sulfide content matrix S0, and if the central control module judges that the comparison result does not accord with a first preset condition, the central control module controls the rising temperature of a first temperature adjusting valve 15 or controls a gas adjusting valve 12 to add gas so as to adjust the content of the hydrogen sulfide;

if the central control module judges that the comparison result meets a first preset condition, the central control module compares the total alkalinity of the mixed liquid with the total alkalinity of the preset mixed liquid, if the central control module judges that the comparison result does not meet a second preset condition, the central control module calculates the total alkalinity difference of the mixed liquid and compares the total alkalinity difference with the parameters in a preset mixed liquid total alkalinity difference matrix delta Jh0, and according to the comparison result, the central control module controls the coal gas regulating valve 12 to add coal gas or controls the doctor solution regulating valve 16 to add doctor solution so as to regulate the total alkalinity of the mixed liquid;

if the central control module judges that the comparison result meets a second preset condition, the central control module compares the concentration of the mixed liquid with the concentration of a preset mixed liquid, if the central control module judges that the comparison result does not meet a third preset condition, the central control module calculates the difference value of the mixed liquid and compares the difference value with the parameter in a preset mixed liquid concentration difference value matrix delta eta h0, and according to the comparison result, the central control module controls a coal gas regulating valve 12 to add coal gas or controls a doctor solution regulating valve 16 to add a doctor solution to regulate the concentration of the mixed liquid;

step three, opening a first control valve 11 to enable the mixed liquid to flow out from the bottom of the desulfurization tower 1, enter a rich liquid tank 2, then pressurize through a rich liquid pump 21 and then enter an ejector 3, wherein when the mixed liquid passes through an ejector nozzle 31, an ejector suction chamber 32 forms negative pressure to automatically suck air, the mixed liquid and the air flow in parallel and sequentially pass through an ejector throat pipe 33 and an ejector diffusion pipe 34, and finally are discharged through an ejector tail pipe 35;

step four, enabling mixed liquor and air discharged by the ejector tail pipe 35 to flow upwards in parallel to enter the bottom of the regeneration tank 4, enabling suspended sulfur particles in the mixed liquor to be subjected to air flotation to form sulfur foam and clear liquid, detecting the density of the sulfur foam in real time by using a density detector, measuring the total alkalinity of the clear liquid in real time by using a third total alkalinity measuring instrument, and measuring the concentration of the clear liquid in real time by using a third concentration measuring instrument;

the real-time measurement or real-time detection in the embodiment of the invention refers to taking out a part of the desulfurization solution, the mixed solution, the sulfur foam or the clear solution in real time and putting the part into corresponding equipment for measurement or detection;

step five, opening a liquid level regulating valve 41 to enable the clear liquid to enter a lean liquid tank 5, pressurizing the clear liquid by a lean liquid pump 51, and then pumping the pressurized clear liquid into the desulfurizing tower 1 to be used as desulfurizing liquid;

step six, opening a second control valve 42 to enable the sulfur foam to flow into a foam tank 6 and be pumped into a sulfur melting kettle 7 through a foam pump 61 to melt sulfur;

the desulfurizing tower 1 and the regeneration tank 4 are both connected with a central control module through wireless, the central control module is used for controlling the whole desulfurizing process, and a matrix is arranged in the central control module.

In the embodiment of the invention, coke oven gas enters a tower from the bottom of a desulfurizing tower 1 and reversely contacts with desulfurizing liquid in the tower, the desulfurizing liquid absorbs hydrogen sulfide in the tower to form mixed liquid, a hydrogen sulfide detector is used for detecting the content of the hydrogen sulfide in the coke oven gas in real time in the process, a central control module compares the content of the hydrogen sulfide with parameters in a preset hydrogen sulfide content matrix S0, and if the central control module judges that a comparison result does not meet a first preset condition, the central control module controls a first temperature regulating valve 15 to raise the temperature or controls a gas regulating valve 12 to add gas so as to regulate the content of the hydrogen sulfide; if the central control module judges that the comparison result meets the first preset condition, the central control module compares the total alkalinity of the mixed liquid with the total alkalinity of the preset mixed liquid, if the central control module judges that the comparison result does not meet the second preset condition, the central control module calculates the total alkalinity difference value of the mixed liquid and compares the total alkalinity difference value with the parameters in a preset mixed liquid total alkalinity difference matrix delta Jh0, and according to the comparison result, the central control module controls the coal gas regulating valve 12 to add coal gas or controls the doctor solution regulating valve 16 to add doctor solution to regulate the total alkalinity of the mixed liquid; if the central control module judges that the comparison result meets the second preset condition, the central control module compares the concentration of the mixed liquid with the concentration of the preset mixed liquid, if the central control module judges that the comparison result does not meet the third preset condition, the central control module calculates the difference value of the mixed liquid and compares the difference value with the parameter in the preset mixed liquid concentration difference value matrix delta eta h0, and according to the comparison result, the central control module controls the coal gas regulating valve 12 to add coal gas or controls the doctor solution regulating valve 16 to add doctor solution to regulate the concentration of the mixed liquid;

if the central control module judges that the comparison result meets a third preset condition, the central control module controls the desulfurization process to enter the next process, then, the first control valve 11 is opened to enable the mixed liquid to flow out from the bottom of the desulfurization tower 1, enter the pregnant solution tank 2, be pressurized by the pregnant solution pump 21 and then be pumped into the ejector 3, when the mixed liquid passes through the ejector nozzle 31, the ejector suction chamber 32 forms negative pressure to automatically suck air, the mixed liquid and the air flow in parallel sequentially through the ejector throat 33 and the ejector diffusion pipe 34 and finally be discharged by the ejector tail pipe 35, then, the mixed liquid and the air discharged by the ejector tail pipe 35 flow in parallel and flow upwards into the bottom of the regeneration tank 4, suspended sulfur particles in the mixed liquid are floated by the air to form sulfur foam and clear liquid, then, the liquid level regulating valve 41 is opened to enable the clear liquid to enter the barren solution tank 5 and then be pressurized by the barren solution pump 51 and then be pumped into the desulfurization tower 1 to be used as desulfurization liquid, then, the second control valve 42 is opened to allow the sulfur foam to flow into the foam tank 6 and to be pumped into the sulfur melting pot 7 via the foam pump 61 to melt the sulfur. Therefore, the content of the hydrogen sulfide can be adjusted by controlling the rising temperature of the first temperature adjusting valve 15, and the clear liquid is used as the desulfurization liquid, so that the speed of the desulfurization liquid for absorbing the hydrogen sulfide is increased, the desulfurization liquid can be recycled, and the environmental pollution and the resource consumption are reduced.

Specifically, the central control module is further provided with a preset hydrogen sulfide content matrix S0(S1, S2, S3, S4), wherein S1 represents a preset first hydrogen sulfide content, S2 represents a preset second hydrogen sulfide content, S3 represents a preset third hydrogen sulfide content, S4 represents a preset fourth hydrogen sulfide content, S1 < S2 < S3 < S4;

the hydrogen sulfide content measured by the hydrogen sulfide detector is S;

if S < S1, the central control module controls the first temperature regulating valve 15 to raise the temperature by Qsa amount, Qsa is 4Q1+3Q2;

if S1 is not more than S < S2, the central control module controls the first temperature adjusting valve 15 to raise the temperature of Qsb, and Qsb is 2Q3+3Q4;

if S2 is not more than S < S3, the central control module controls the first temperature adjusting valve 15 to raise the temperature of Qsc, wherein Qsc is Qsa + Qsb;

if S is not more than S3 and is less than S4, the central control module controls the coal gas regulating valve 12 to add coal gas with the quantity of Mm 1;

if S is larger than or equal to S4, the central control module controls the coal gas regulating valve 12 to add coal gas with the quantity of Mm2;

According to the embodiment of the invention, the hydrogen sulfide content is compared with the parameters in the preset hydrogen sulfide content matrix S0, and if the central control module determines that the comparison result does not meet the first preset condition, the central control module controls the temperature rise of the first temperature regulating valve 15 or controls the gas regulating valve 12 to add gas to regulate the hydrogen sulfide content, so that the hydrogen sulfide content can be regulated by controlling the temperature rise of the first temperature regulating valve 15, and the speed of absorbing hydrogen sulfide by the desulfurization solution is further effectively increased.

Specifically, the central control module is further provided with a preset mixed liquor total alkalinity difference matrix delta Jh0 (delta Jh1, delta Jh2, delta Jh3 and delta Jh4), wherein delta Jh1 represents a first difference value of the preset mixed liquor total alkalinity, delta Jh2 represents a second difference value of the preset mixed liquor total alkalinity, delta Jh3 represents a third difference value of the preset mixed liquor total alkalinity, and delta Jh4 represents a fourth difference value of the preset mixed liquor total alkalinity;

if the delta Jh is equal to the delta Jhi, and i is equal to 1,2, the central control module controls the gas regulating valve 12 to add Mmi amount of gas;

if delta Jh is delta Jhi, i is 3,4, the central control module controls the doctor solution regulating valve 16 to add doctor solution with the amount of Msi;

Jh0＝Jt0×α；

According to the embodiment of the invention, the total alkalinity of the mixed liquor is compared with the preset total alkalinity of the mixed liquor, if the central control module judges that the comparison result does not meet the second preset condition, the central control module calculates the total alkalinity difference value of the mixed liquor and compares the total alkalinity difference value with the parameters in the preset mixed liquor total alkalinity difference value matrix delta Jh0, and according to the comparison result, the central control module controls the coal gas regulating valve 12 to add coal gas or controls the doctor solution regulating valve 16 to add doctor solution to regulate the total alkalinity of the mixed liquor, so that the speed of the doctor solution for absorbing hydrogen sulfide is effectively increased.

Specifically, the central control module is provided with a preset desulfurization liquid total alkalinity difference matrix delta Jt0 (delta Jt1, delta Jt2, delta Jt3 and delta Jt4), wherein delta Jt1 represents a first difference of the preset desulfurization liquid total alkalinity, delta Jt2 represents a second difference of the preset desulfurization liquid total alkalinity, delta Jt3 represents a third difference of the preset desulfurization liquid total alkalinity, delta Jt4 represents a fourth difference of the preset desulfurization liquid total alkalinity, and delta Jt1 is smaller than delta Jt2 and smaller than delta Jt3 and smaller than delta Jt 4;

if η h is less than η h0, the central control module judges that the comparison result does not meet a third preset condition, calculates a mixed liquid difference value Δ η h, wherein Δ η h is η h0- η h, compares Δ η h with a parameter in a preset mixed liquid concentration difference matrix Δ η h0, and controls the gas regulating valve 12 to add Mma amount of gas if Δ η h is Δ η h1, wherein Mma is 4Mm1+3Mm 2; if the Δ η h is equal to Δ η h2, the central control module controls the gas regulating valve 12 to add Mmb amount of gas, Mmb is equal to 3Mm1+2Mm2; if the Δ η h is equal to Δ η h3, the central control module controls the desulfurization liquid regulating valve 16 to add the desulfurization liquid with the amount of Msa, and the Msa is equal to 3Ms1+2Ms 2; if the Δ η h is equal to Δ η h4, the central control module controls the desulfurization liquid regulating valve 16 to add the desulfurization liquid with the amount of Msb, and the Msb is equal to 5Ms1+4Ms 2;

ηh0＝β×ηt0；

wherein β represents a mixed liquid concentration adjustment coefficient.

According to the embodiment of the invention, the concentration of the mixed liquid is compared with the preset mixed liquid concentration, if the central control module judges that the comparison result does not meet the third preset condition, the central control module calculates the difference value of the mixed liquid and compares the difference value with the parameter in the preset mixed liquid concentration difference value matrix delta eta h0, and according to the comparison result, the central control module controls the coal gas regulating valve 12 to add coal gas or controls the doctor solution regulating valve 16 to add doctor solution to regulate the concentration of the mixed liquid, so that the speed of the doctor solution for absorbing hydrogen sulfide is effectively increased.

Specifically, if the central control module determines that the comparison result meets a fifth preset condition, the central control module controls the desulfurization process to enter the next process;

the central control module is further provided with a catalyst dosage matrix Mc (Mc1, Mc2, Mc3, Mc4), wherein Mc1 represents a first catalyst dosage, Mc2 represents a second catalyst dosage, Mc3 represents a third catalyst dosage, and Mc4 represents a fourth catalyst dosage;

after the desulfurization solution is added into the desulfurization tower 1 in the step one, the central control module compares the total alkalinity Jt of the desulfurization solution with the preset total alkalinity Jt0 of the desulfurization solution:

if Jt is less than Jt0, the central control module calculates a first difference value delta Jta of the total alkalinity of the desulfurization solution, and delta Jta is equal to Jt0-Jt, compares the delta Jta with parameters in a preset difference matrix delta Jt0 of the total alkalinity of the desulfurization solution, and if delta Jta is less than delta Jt1, the central control module controls the first regulating valve 13 to add the catalyst with the amount of Mc 1; if the delta Jt1 is less than or equal to delta Jta and less than delta Jt2, the central control module controls the first regulating valve 13 to add catalyst with the amount of Mc 2; if the delta Jt2 is less than or equal to delta Jta and less than delta Jt3, the central control module controls the first regulating valve 13 to add catalyst with the amount of Mc 3; if the delta Jt3 is less than or equal to delta Jta and less than delta Jt4, the central control module controls the first regulating valve 13 to add catalyst with the amount of Mc 4; if Δ Jta ≧ Δ Jt4, the central control module controls the first regulating valve 13 to add an amount of catalyst Mc14, where Mc14 ═ Mc1+ Mc2+ Mc3+ Mc 14;

if the Jt is more than the Jt0, the central control module calculates a second difference value delta Jtb of the concentration of the desulfurization solution, the delta Jtb is equal to Jt-Jt0, the delta Jtb is compared with parameters in a preset desulfurization solution total alkalinity difference matrix delta Jt0, and if the delta Jtb is less than the delta Jt1, the central control module controls the second regulating valve 14 to add sodium carbonate solution with the amount of Mt 1; if the delta Jt1 is less than or equal to delta Jtb and less than delta Jt2, the central control module controls the second regulating valve 14 to add sodium carbonate solution with the amount of Mt 2; if the delta Jt2 is less than or equal to delta Jtb and less than delta Jt3, the central control module controls the second regulating valve 14 to add sodium carbonate solution with the amount of Mt 3; if the delta Jt3 is less than or equal to delta Jtb and less than delta Jt4, the central control module controls the second regulating valve 14 to add sodium carbonate solution with the amount of Mt 4; if delta Jtb is not less than delta Jt4, the central control module controls the second regulating valve 14 to add Mt12 sodium carbonate solution, wherein Mt12 is Mt1+ Mt 2;

According to the embodiment of the invention, the total alkalinity of the desulfurization solution is compared with the preset total alkalinity of the desulfurization solution, and if the central control module determines that the comparison result does not meet the fourth preset condition, the central control module controls the first regulating valve 13 or the second regulating valve 14 to add the catalyst or the sodium carbonate solution to regulate the total alkalinity of the desulfurization solution, so that the speed of absorbing hydrogen sulfide by the desulfurization solution is effectively increased.

Specifically, the central control module is further provided with a preset doctor solution concentration difference matrix Δ η t0(Δ η t1, Δ η t2, Δ η t3 and Δ η t4), wherein Δ η t1 represents a first difference of preset doctor solution concentration, Δ η t2 represents a second difference of preset doctor solution concentration, Δ η t3 represents a third difference of preset doctor solution concentration, and Δ η t4 represents a fourth difference of preset doctor solution concentration;

if eta t is less than eta t0, the central control module calculates a first difference delta eta ta of the concentration of the doctor solution, the delta eta is eta t 0-eta t, compares the delta eta ta with parameters in a preset doctor solution concentration difference matrix delta eta t0, and controls the first temperature regulating valve 15 to reduce the temperature of Qi quantity if the delta eta ta is delta eta ti, i is 1,2,3 and 4;

if η t is greater than η t0, the central control module calculates a second difference value Δ η tb of the doctor solution concentration, where Δ η tb is equal to η t- η t0, compares Δ η tb with parameters in a preset doctor solution concentration difference matrix Δ η t0, and if Δ η tb is equal to Δ η ti, i is equal to 1,2,3,4, the central control module controls the first temperature adjusting valve 15 to raise the temperature by Qi;

According to the embodiment of the invention, the concentration of the desulfurization solution is compared with the preset concentration of the desulfurization solution, and if the central control module determines that the comparison result does not meet the fifth preset condition, the central control module controls the first temperature regulating valve 15 to reduce or raise the temperature so as to regulate the concentration of the desulfurization solution, so that the speed of the desulfurization solution for absorbing hydrogen sulfide is effectively increased.

Specifically, the central control module is further provided with a preset sulfur foam density difference interval matrix delta rho 0 (delta rho 1, delta rho 2, delta rho 3 and delta rho 4), wherein the delta rho 1 represents a first difference interval of the preset sulfur foam density, the delta rho 2 represents a second difference interval of the preset sulfur foam density, the delta rho 3 represents a third difference interval of the preset sulfur foam density, and the delta rho 4 represents a fourth difference interval of the preset sulfur foam density;

the density of the sulfur foam measured by the density detector is rho;

if rho is less than rho 0, the central control module judges that the comparison result does not meet a sixth preset condition and calculates a sulfur foam difference value delta rho, after the calculation is finished, the central control module matches the delta rho with parameters in a preset sulfur foam density difference value interval matrix delta rho 0, if the delta rho is in the range of delta rho i, i is 1,2,3 and 4, and the central control module controls an air suction chamber regulating valve 321 to add air with the Mki amount;

△ρ＝δ×(ρ0-ρ)；

where δ represents a sulfur foam difference coefficient.

According to the embodiment of the invention, the sulfur foam density is compared with the preset sulfur foam density, if the central control module judges that the comparison result does not meet the sixth preset condition, the central control module calculates the sulfur foam difference value and matches the sulfur foam difference value with the parameters in the interval matrix delta rho 0 of the preset sulfur foam density difference value, and according to the matching result, the central control module controls the air suction chamber adjusting valve 321 to adjust the sulfur foam density, so that the speed of absorbing hydrogen sulfide by the desulfurization solution is effectively increased.

Specifically, the central control module is further provided with a preset clear liquid total alkalinity difference matrix delta Jq0 (delta Jq1, delta Jq2, delta Jq3, delta Jq4), wherein delta Jq1 represents a first difference of the preset clear liquid total alkalinity, delta Jq2 represents a second difference of the preset clear liquid total alkalinity, delta Jq3 represents a third difference of the preset clear liquid total alkalinity, and delta Jq4 represents a fourth difference of the preset clear liquid total alkalinity;

if Jq is less than Jq0, the central control module judges that the comparison result does not meet a seventh preset condition, calculates a clear liquid total alkalinity difference value delta Jq, and compares the delta Jq with parameters in a preset clear liquid total alkalinity difference matrix delta Jq0, and if the delta Jq is equal to delta Jqi, i is equal to 1,2,3 and 4, the central control module controls the first adjusting valve 13 to add mixed liquid with the quantity of Mhi;

Jq0＝Φ×Jh0；

According to the embodiment of the invention, the total alkalinity of the clear liquid is compared with the preset total alkalinity of the clear liquid, if the central control module judges that the comparison result does not meet the seventh preset condition, the central control module calculates the total alkalinity difference value of the clear liquid and compares the total alkalinity difference value with the parameters in the preset total alkalinity difference matrix delta Jq0 of the clear liquid, and according to the comparison result, the central control module controls the first regulating valve 13 to add the mixed liquid to regulate the total alkalinity of the clear liquid, so that the speed of absorbing hydrogen sulfide by the desulfurization liquid is effectively increased.

Specifically, the central control module is further provided with a preset clear liquid concentration difference matrix delta eta q0 (delta eta q1, delta eta q2, delta eta q3 and delta eta q4), wherein delta eta q1 represents a first difference of preset clear liquid concentration, delta eta q2 represents a second difference of preset clear liquid concentration, delta eta q3 represents a third difference of preset clear liquid concentration, and delta eta q4 represents a fourth difference of preset clear liquid concentration;

ηq0＝γ×ηh0；

wherein γ represents a clear solution concentration adjustment coefficient.

According to the embodiment of the invention, the concentration of the clear liquid is compared with the preset clear liquid concentration, if the central control module judges that the comparison result does not accord with the eighth preset condition, the central control module controls the second temperature regulating valve to reduce or raise the temperature so as to regulate the concentration of the clear liquid, and if the central control module judges that the comparison result accords with the eighth preset condition, the central control module controls the desulfurization process to enter the next process, so that the speed of absorbing hydrogen sulfide by the desulfurization liquid is effectively increased, the desulfurization liquid can be recycled, and the environmental pollution and the resource consumption are reduced.

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention; various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A coke oven gas desulfurization process is characterized by comprising the following steps:

secondly, coke oven gas enters the tower from the bottom of the desulfurization tower and reversely contacts with desulfurization liquid in the tower, the desulfurization liquid absorbs hydrogen sulfide in the tower to form mixed liquid, in the process, a hydrogen sulfide detector is used for detecting the content of the hydrogen sulfide in the coke oven gas in real time, a second total alkalinity measuring instrument is used for measuring the total alkalinity of the mixed liquid in real time, a second concentration measuring instrument is used for measuring the concentration of the mixed liquid in real time, in the process of forming the mixed liquid, a central control module compares the content of the hydrogen sulfide with parameters in a preset hydrogen sulfide content matrix S0, and if the central control module judges that the comparison result does not accord with a first preset condition, the central control module controls the rising temperature of a first temperature regulating valve or controls a gas regulating valve to be added into the gas to regulate the content of the hydrogen sulfide;

the hydrogen sulfide content measured by the hydrogen sulfide detector is S;

if S < S1, the central control module controls the first temperature regulating valve to raise the temperature by Qsa amount, Qsa =4Q1+3Q2;

if S1 is not less than S < S2, the central control module controls the temperature of the first temperature adjusting valve to rise by Qsb, and Qsb =2Q3+3Q4;

if S2 is not less than S < S3, the central control module controls the temperature of the first temperature adjusting valve to rise by Qsc, and Qsc = Qsa + Qsb;

if S = S3, the central control module determines that the comparison result meets a first preset condition.

2. The coke oven gas desulfurization process of claim 1, wherein the central control module is further provided with a preset mixed liquor total alkalinity difference matrix Δ Jh0(Δ Jh1, Δ Jh2, Δ Jh3, Δ Jh4), wherein Δ Jh1 represents a first difference in the total alkalinity of the preset mixed liquor, Δ Jh2 represents a second difference in the total alkalinity of the preset mixed liquor, Δ Jh3 represents a third difference in the total alkalinity of the preset mixed liquor, and Δ Jh4 represents a fourth difference in the total alkalinity of the preset mixed liquor;

if Jh is less than Jh0, the central control module judges that the comparison result does not meet a second preset condition and calculates the total alkalinity difference value delta Jh of the mixed liquor, delta Jh = Jh0-Jh, and compares the delta Jh with the parameters in a preset mixed liquor total alkalinity difference value matrix delta Jh0,

if delta Jh =delta Jhi, i =1,2, the central control module controls the gas regulating valve to add Mmi amount of gas;

if delta Jh =delta Jhi, i =3,4, the central control module controls the doctor solution adjusting valve to add doctor solution in the amount of Msi;

Jh0=Jt0×α；

3. The coke oven gas desulfurization process according to claim 1 or 2, wherein the central control module is provided with a preset desulfurization solution total alkalinity difference matrix Δ Jt0(Δ Jt1, Δ Jt2, Δ Jt3, Δ Jt4), wherein Δ Jt1 represents a first difference of the preset desulfurization solution total alkalinity, Δ Jt2 represents a second difference of the preset desulfurization solution total alkalinity, Δ Jt3 represents a third difference of the preset desulfurization solution total alkalinity, Δ Jt4 represents a fourth difference of the preset desulfurization solution total alkalinity, and Δ Jt1 < Δ Jt2 < Δ Jt3 < Δ Jt 4;

the central control module is further provided with a preset mixed liquid concentration difference matrix delta η h0 (delta η h1, delta η h2, delta η h3, delta η h4), wherein delta η h1=0.9 x delta η t1, which represents a first difference of the preset mixed liquid concentration, delta η h2=0.8 x delta η t2, which represents a second difference of the preset mixed liquid concentration, delta η h3=0.7 x delta η t3, which represents a third difference of the preset mixed liquid concentration, delta η h4=0.6 x delta η t4, which represents a fourth difference of the preset mixed liquid concentration;

if η h is less than η h0, the central control module judges that the comparison result does not meet a third preset condition and calculates a mixed liquor difference value delta η h, wherein delta η h = η h0- η h, and compares the delta η h with parameters in a preset mixed liquor concentration difference matrix delta η h0, if delta η h =Δη h1, the central control module controls a gas regulating valve to add Mma amount of gas, and Mma =4Mm1+3Mm 2; if the delta eta h is not=deltaeta h2, the central control module controls the gas regulating valve to add Mmb amount of gas, Mmb =3Mm1+2Mm2, and if the delta eta h is not less than delta eta h3, the central control module controls the doctor solution regulating valve to add Msa amount of doctor solution, and Msa =3Ms1+2Ms 2; if the Δ η h =Δη h4, the central control module controls the desulfurization liquid regulating valve to add the desulfurization liquid with the amount of Msb, and the Msb =5Ms1+4Ms 2;

ηh0=β×ηt0；

wherein β represents a mixed liquid concentration adjustment coefficient.

4. The coke oven gas desulfurization process of claim 1, wherein after the desulfurization solution is added to the desulfurization tower in the step one, the central control module compares the total alkalinity of the desulfurization solution with the preset total alkalinity of the desulfurization solution, and if the central control module determines that the comparison result does not meet the fourth preset condition, the central control module adds a catalyst or a sodium carbonate solution to adjust the total alkalinity of the desulfurization solution by controlling the first adjusting valve or the second adjusting valve;

if the central control module judges that the comparison result meets the fourth preset condition, the central control module compares the concentration of the desulfurization solution with the preset concentration of the desulfurization solution, and if the central control module judges that the comparison result does not meet the fifth preset condition, the central control module controls the first temperature regulating valve to reduce or raise the temperature so as to regulate the concentration of the desulfurization solution;

if the central control module judges that the comparison result meets a fifth preset condition, the central control module controls the desulfurization process to enter the next process;

if Jt is less than Jt0, the central control module calculates a first difference value delta Jta of the total alkalinity of the desulfurization solution, delta Jta = Jt0-Jt, and compares the delta Jta with parameters in a preset difference matrix delta Jt0 of the total alkalinity of the desulfurization solution, and if delta Jta is less than delta Jt1, the central control module controls a first adjusting valve to add a catalyst in an amount of Mc 1; if the delta Jt1 is less than or equal to delta Jta and less than delta Jt2, the central control module controls the first regulating valve to add catalyst with the amount of Mc 2; if the delta Jt2 is less than or equal to delta Jta and less than delta Jt3, the central control module controls the first regulating valve to add catalyst with the amount of Mc 3; if the delta Jt3 is less than or equal to delta Jta and less than delta Jt4, the central control module controls the first regulating valve to add catalyst with the amount of Mc 4; if Δ Jta ≧ Δ Jt4, the central control module controls the first regulator valve to add an amount of catalyst Mc14, wherein Mc14= Mc1+ Mc2+ Mc3+ Mc 14;

if Jt is more than Jt0, the central control module calculates a second difference value delta Jtb of the concentration of the doctor solution, delta Jtb = Jt-Jt0, compares the delta Jtb with parameters in a preset doctor solution total alkalinity difference matrix delta Jt0, and controls a second regulating valve to add sodium carbonate solution with the amount Mt1 if delta Jtb is less than delta Jt 1; if the delta Jt1 is less than or equal to delta Jtb and less than delta Jt2, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 2; if the delta Jt2 is less than or equal to delta Jtb and less than delta Jt3, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 3; if the delta Jt3 is less than or equal to delta Jtb and less than delta Jt4, the central control module controls a second adjusting valve to add sodium carbonate solution with the amount of Mt 4; if delta Jtb is not less than delta Jt4, the central control module controls the second adjusting valve to add Mt12 sodium carbonate solution, wherein Mt12= Mt1+ Mt 2;

5. The coke oven gas desulfurization process according to claim 4, wherein the central control module is further provided with a preset desulfurization solution concentration difference matrix Δ η t0(Δ η t1, Δ η t2, Δ η t3, Δ η t4), wherein Δ η t1 represents a first difference of the preset desulfurization solution concentration, Δ η t2 represents a second difference of the preset desulfurization solution concentration, Δ η t3 represents a third difference of the preset desulfurization solution concentration, and Δ η t4 represents a fourth difference of the preset desulfurization solution concentration;

if eta t is less than eta t0, the central control module calculates a first difference delta eta ta of the concentration of the doctor solution, the delta eta = eta t 0-eta t, compares the delta eta ta with parameters in a preset doctor solution concentration difference matrix delta eta t0, and if the delta eta is not equal to delta eta ti, i =1,2,3,4, the central control module controls a first temperature regulating valve to reduce the temperature of Qi quantity;

if eta t is more than eta t0, the central control module calculates a second difference delta eta tb of the doctor solution concentration, the delta eta tb = eta t-eta t0, compares the delta eta tb with parameters in a preset doctor solution concentration difference matrix delta eta t0, and controls the first temperature regulating valve to increase the temperature by Qi if the delta eta tb = delta eta ti, i =1,2,3, 4;

6. The coke oven gas desulfurization process according to claim 1, wherein the central control module is further provided with a preset sulfur foam density difference interval matrix Δ ρ 0(Δ ρ 1, Δ ρ 2, Δ ρ 3, Δ ρ 4), wherein Δ ρ 1 represents a first difference interval of preset sulfur foam density, Δ ρ 2 represents a second difference interval of preset sulfur foam density, Δ ρ 3 represents a third difference interval of preset sulfur foam density, and Δ ρ 4 represents a fourth difference interval of preset sulfur foam density;

the density of the sulfur foam measured by the density detector is rho;

if rho is less than rho 0, the central control module judges that the comparison result does not meet a sixth preset condition and calculates a sulfur foam difference value delta rho, after the calculation is finished, the central control module matches the delta rho with parameters in a preset sulfur foam density difference value interval matrix delta rho 0, if the delta rho is in the range of delta rho i, i =1,2,3,4, and the central control module controls an air suction chamber regulating valve to add air with Mki quantity;

△ρ=δ×（ρ0-ρ）；

where δ represents a sulfur foam difference coefficient.

7. The coke oven gas desulfurization process according to claim 6, wherein after the suspended sulfur particles in the mixed solution of step four are air-floated, the central control module compares the sulfur foam density with a preset sulfur foam density, if the central control module determines that the comparison result does not meet the sixth preset condition, the central control module calculates the sulfur foam difference and matches the sulfur foam difference with the parameters in the interval matrix Δ ρ 0 of the preset sulfur foam density difference, and according to the matching result, the central control module controls the air suction chamber regulating valve to add control so as to regulate the sulfur foam density;

if the central control module judges that the comparison result meets a sixth preset condition, the central control module compares the total alkalinity of the clear liquid with the total alkalinity of the preset clear liquid, if the central control module judges that the comparison result does not meet the seventh preset condition, the central control module calculates the total alkalinity difference value of the clear liquid and compares the total alkalinity difference value with the parameters in a preset total alkalinity difference matrix delta Jq0, and according to the comparison result, the central control module controls a first regulating valve to add the mixed liquid to regulate the total alkalinity of the clear liquid;

if the central control module judges that the comparison result meets a seventh preset condition, the central control module compares the concentration of the clear liquid with a preset clear liquid concentration, and if the central control module judges that the comparison result does not meet an eighth preset condition, the central control module controls a second temperature regulating valve to reduce or raise the temperature so as to regulate the concentration of the clear liquid;

if the central control module judges that the comparison result meets the eighth preset condition, the central control module controls the desulfurization process to enter the next process;

the central control module is further provided with a preset clear liquid total alkalinity difference matrix delta Jq0 (delta Jq1, delta Jq2, delta Jq3 and delta Jq4), wherein delta Jq1 represents a first difference of the preset clear liquid total alkalinity, delta Jq2 represents a second difference of the preset clear liquid total alkalinity, delta Jq3 represents a third difference of the preset clear liquid total alkalinity, and delta Jq4 represents a fourth difference of the preset clear liquid total alkalinity;

if Jq is less than Jq0, the central control module judges that the comparison result does not meet a seventh preset condition, calculates a difference value delta Jq of total alkalinity of the clear liquid, and the delta Jq = Jq0-Jq, compares the delta Jq with parameters in a preset difference matrix delta Jq0 of the total alkalinity of the clear liquid, and controls the first adjusting valve to add mixed liquid with the quantity of Mhi if the delta Jq =delta Jqi, i =1,2,3 and 4;

Jq0=Φ×Jh0；

8. The coke oven gas desulfurization process according to claim 5 or 7, wherein the central control module is further provided with a preset clear liquid concentration difference matrix Δ η q0(Δ η q1, Δ η q2, Δ η q3, Δ η q4), wherein Δ η q1 represents a first difference of the preset clear liquid concentration, Δ η q2 represents a second difference of the preset clear liquid concentration, Δ η q3 represents a third difference of the preset clear liquid concentration, and Δ η q4 represents a fourth difference of the preset clear liquid concentration;

if eta q is less than eta q0, the central control module calculates a first difference delta eta qa of the clear liquid concentration, delta eta qa = eta q 0-eta q + eta, compares the delta eta qa with parameters in a preset clear liquid concentration difference matrix delta eta q0, and if the delta eta qa =deltaeta Qi, i =1,2,3,4, the central control module controls a second temperature regulating valve to reduce the temperature of the Qai quantity, and Qai =3 Qi;

if eta q is larger than eta q0, the central control module calculates a second difference delta eta qb of the clear liquid concentration, the delta eta qb = eta q-eta q0+ delta eta tb, compares the delta eta qb with parameters in a preset doctor liquid concentration difference matrix delta eta q0, and if the delta eta qb is not equal to delta eta Qi, i =1,2,3,4, the central control module controls the second temperature regulating valve to raise the temperature of Qbi quantity, and Qbi =2 Qi;

ηq0=γ×ηh0；

wherein γ represents a clear solution concentration adjustment coefficient.