CN107974263A - A safe, simple, efficient and environmentally friendly tar purification and solid waste treatment process - Google Patents

Abstract

The invention relates to a safe, simple, efficient and environment-friendly tar purification and solid waste treatment process, which relates to the technical field of coking production; the gas outlet of the coke oven group is connected with a coke oven gas collecting pipe in a spraying manner, the outlet sprayed by the coke oven gas collecting pipe is connected with a gas-liquid separator, the mixed condensate outlet of the gas-liquid separator is connected with a preseparator, the tar residue outlet of the preseparator is connected with a tar squeezing pump, the discharge port of the tar squeezing pump is connected with the preseparator, meanwhile, the liquid outlet of the preseparator is connected with a tar-ammonia water separation tank, and the oil outlet of the tar-ammonia water separation tank is connected with a tar storage tank; the discharge port of the tar residue delivery pump is connected with the coke oven group; the water outlet of the tar and ammonia water separation tank is connected with the gas collecting pipe of the coke oven in a spraying way. The problem of the artifical scarfing cinder of traditional tar tank bottom to and traditional tar sediment transport mode in-process can cause the oil sediment seepage pollution problem on ground and reduce artifical, the vehicle loss scheduling problem in this flow is solved.

Description

A safe, simple, efficient and environmentally friendly tar purification and solid waste treatment process

technical field

The invention relates to the technical field of coking production, in particular to a safe, simple, efficient and environment-friendly tar purification and solid waste treatment process.

Background technique

During the production process of coking in coking plants, the high-temperature coke oven gas produced is condensed to form coal tar under the conditions of the gas collector or primary cooler. At the same time, the coal powder and semi-coke entrained in the gas are also mixed in the coal tar to form agglomerates of various sizes, which are called tar residues. Coking plants produce a large amount of tar slag every year, and the tar slag discharged from the mechanized slag scraping tank accounts for the main part, which is then used for coal blending.

At present, there are the following problems in domestic coking plants: most of them are mechanized clarifiers, and the tar residue has a large particle size and uneven quality, which affects the quality of coal blending; the separated tar contains some tar residue, and the tar moisture content is high. The quality is not up to the standard; the recycling rate of tar is low; the open working environment, the poisonous gas produced by ammonia water, tar and other chemical substances have a strong harmful taste and serious dust pollution. Tar slag is usually cleared from the storage tank manually or transported to the coal blending yard by forklift. In short, the traditional way, the environment of the entire coking plant is harsh, and there will be tar residue on the ground, which is not environmentally friendly and needs to be improved urgently.

Contents of the invention

The object of the present invention is to aim at the defects and deficiencies of the prior art, to provide a simple structure, reasonable design, easy to use, safe, concise, efficient and environmentally friendly tar purification and solid waste treatment process, which is safe, environmentally friendly and reliable; solves the traditional The problem of manual cleaning of tar tank bottoms, as well as the problem of oil residue leakage and pollution on the ground caused by the traditional tar residue transportation method, and the reduction of labor and vehicle losses in this process; the purified tar oil is clean , the moisture content of the tar is below 2%, and it can be directly used as a finished product for subsequent deep processing of tar without further purification treatment.

In order to achieve the above object, the technical scheme adopted in the present invention is: it comprises coke oven group, coke oven gas collecting pipe spraying, tar ammonia water separation tank, pre-separator, tar storage tank, gas-liquid separator, tar slag delivery pump, tar Squeeze pump, three-phase horizontal screw centrifuge, centrifuge feed pump; the gas outlet of the coke oven group is connected to the spraying of the coke oven gas collection pipe, the spray outlet of the coke oven gas collection pipe is connected to the gas-liquid separator, and the gas-liquid separator The coagulation liquid outlet is connected to the pre-separator, the tar residue outlet of the pre-separator is connected to the tar press pump, the discharge port of the tar press pump is connected to the pre-separator, and the liquid outlet of the pre-separator is connected to the tar ammonia water separation tank , the oil outlet of the tar ammonia water separation tank is connected to the tar storage tank, and the connecting pipeline between the tar ammonia water separation tank and the tar storage tank is provided with a centrifuge feed pump and a three-phase horizontal screw centrifuge in sequence; wherein, the three-phase horizontal screw centrifuge The oil outlet of the centrifuge is connected to the tar storage tank, the insulation conical funnel tank at the bottom of the slag outlet of the three-phase decanter centrifuge is connected to the tar residue delivery pump, and the water outlet of the three-phase decanter centrifuge is sprayed with the coke oven gas collecting pipe connection; the discharge port of the tar slag delivery pump is connected to the coke oven group; the water outlet of the tar ammonia water separation tank is connected to the coke oven gas collecting pipe for spraying.

Further, the gas outlet of the gas-liquid separator is connected to a gas cooler, and the gas cooler is connected to a blower.

Further, the temperature inside the coke oven group is >1000°C.

Further, the inside of the pre-separator is obliquely provided with a sieve, and the aperture of the sieve is >5mm.

Further, the inner bottom of the pre-separator is provided with a stirring device.

Working principle of the present invention: when the coal gas in the coke oven group is sprayed through the coke oven gas collecting pipe, the gas and condensate are separated through the gas-liquid separator; the condensate (tar, ammonia water, tar residue mixture) passes through the pre-separator, and the The 5mm tar residue enters the tar squeeze pump by gravity settlement. After crushing and grinding, the tar residue particle size reaches about 3mm. The tar squeeze pump itself has a head of 6~8m, which can form a continuous gap between the tar squeeze pump and the pre-separator. Circulation; the tar residue less than 5mm enters the tar and ammonia water separation tank together with tar and ammonia water. The mixed liquid in the tar ammonia water separation tank is divided into three layers, and the ammonia water in the top layer is transported to the coke oven gas collecting pipe spraying system through an ammonia water delivery pump Reuse, tar and tar residue are sent to a three-phase decanter centrifuge through a centrifuge feed pump for separation, and the separated tar is sent to the tar storage tank; the separated ammonia water is returned to the coke oven gas collecting pipe spraying system for reuse , Make an insulated conical funnel tank at the bottom of the slag outlet of the three-phase decanter centrifuge. When the tar residue separated by the three-phase decanter centrifuge is filled in the conical tank, the slag will enter the tar from the tank The slag conveying pump directly transports the tar slag to the belt of the coal tower through the 60-80 degree electric heat tracing insulation pipeline for coal blending treatment.

After adopting above-mentioned structure, beneficial effect of the present invention is:

1. Small footprint (no need to build a mechanized clarifier);

2. The whole process is completed in a closed pipeline, which solves the air pollution caused by the leakage of ammonia water and dust;

3. Reduce the high cost of slag cleaning every year;

4. Increased tar output and greatly improved tar recovery rate;

5. The quality of tar is improved, and the water content of tar is less than 2%.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is a process diagram of the present invention.

Explanation of reference signs:

Coke oven group 1, coke oven gas collecting pipe spraying 2, tar ammonia water separation tank 3, pre-separator 4, tar storage tank 5, gas-liquid separator 6, tar residue delivery pump 7, tar squeeze pump 8, three-phase horizontal screw Centrifuge 9, centrifuge feed pump 10.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to as shown in Figure 1, the technical scheme that this specific embodiment adopts is: it comprises coke oven oven group 1, coke oven gas collecting pipe spraying 2, tar ammonia water separation tank 3, pre-separator 4, tar storage tank 5, gas-liquid Separator 6, tar slag conveying pump 7, tar squeeze pump 8, three-phase decanter centrifuge 9, centrifuge feed pump 10; the gas outlet of coke oven unit 1 is connected to coke oven gas collecting pipe spray 2, coke oven set The outlet of air pipe spraying 2 is connected with gas-liquid separator 6, the coagulated liquid outlet of gas-liquid separator 6 is connected with pre-separator 4, the tar residue outlet of pre-separator 4 is connected with tar squeeze pump 8, and the outlet of tar squeeze pump 8 The discharge port is connected with the pre-separator 4, and the liquid outlet of the pre-separator 4 is connected with the tar ammonia water separation tank 3, and the oil outlet of the tar ammonia water separation tank 3 is connected with the tar storage tank 5, and the tar ammonia water separation tank 3 is connected with the tar storage tank 5. The connecting pipeline of the tar storage tank 5 is provided with a centrifuge feed pump 10 and a three-phase horizontal screw centrifuge 9 in sequence; wherein, the oil outlet of the three-phase horizontal screw centrifuge 9 is connected with the tar storage tank 5, and the three-phase horizontal screw centrifuge The thermal insulation conical funnel tank at the bottom of the slag outlet of the centrifuge 9 is connected to the tar slag delivery pump 7, and the water outlet of the three-phase decanter centrifuge 9 is connected to the coke oven gas collecting pipe spray 2; the discharge port of the tar slag delivery pump 7 is connected to the The coke oven group 1 is connected; the water outlet of the tar ammonia water separation tank 3 is connected with the coke oven gas collecting pipe spraying 2.

Further, the gas outlet of the gas-liquid separator 6 is connected to the gas cooler 11, and the gas cooler 11 is connected to the blower 12. When the gas in the coke oven group 1 is sprayed 2 through the coke oven gas collector, the gas and The condensate is separated by the gas-liquid separator 6, and the gas enters the gas condenser 11, and enters the gas purification treatment in the later stage through the blower 12.

Further, the temperature inside the coke oven group 1 is >1000°C.

Further, the inside of the pre-separator 4 is obliquely provided with a sieve, the sieve has an aperture > 5 mm, so that the ammonia water and tar with tar residue particles with a particle size less than 5 mm are sent to the tar ammonia water separation tank 3 together.

Further, the temperature at the gas outlet of the coke oven group 1 is 820°C.

Further, the temperature at the gas outlet of the spray 2 of the coke oven gas header is 80°C.

Further, the particle diameter of the tar residue particles discharged from the tar residue outlet of the pre-separator 4 is within 100 mm.

Further, the three-phase decanter centrifuge 9 is a GEA three-phase decanter centrifuge.

Further, the tar squeeze pump 8 is a GORATOR tar squeeze pump.

Further, the volume of the pre-separator 4 is 50m³.

Furthermore, the inner bottom of the pre-separator is provided with a stirring device, which is composed of a stirring motor and a stirring shaft connected to the stirring motor (not shown in the figure).

The working principle of this specific embodiment: when the gas in the coke oven group 1 is sprayed 2 through the coke oven gas collector, the gas and condensate are separated through the gas-liquid separator 6; the condensate (tar, ammonia water, tar residue mixture) passes through The pre-separator 4, the tar residue larger than 5mm enters the tar squeeze pump 8 through gravity settlement, and after crushing and grinding, the tar residue particle size reaches about 3mm, and the tar squeeze pump 8 itself has a lift of 6~8m, which can It forms a continuous cycle with the pre-separator 4; the tar residue less than 5mm enters the tar ammonia water separation tank 3 together with the tar and ammonia water, and the mixed liquid in the tar ammonia water separation tank 3 is divided into three layers, and the ammonia water in the uppermost layer is transported by an ammonia water The pump transports the ammonia water to the coke oven gas collector spraying system 2 for reuse, and the tar and tar residue are sent to the three-phase decanter centrifuge 9 through a centrifuge feed pump 10 for separation, and the separated tar is sent to the tar storage tank 5 The separated ammoniacal liquor returns to the coke oven gas collecting pipe spraying 2 system for reuse, and makes an insulation conical funnel tank at the bottom of the slag outlet of the three-phase decanter centrifuge 9, when the three-phase decanter centrifuge 9 separates When the tar slag is filled in the conical tank, the slag will enter the tar slag conveying pump 7 from the tank, and the tar slag will be directly transported to the belt of the coal tower through the 60-80 degree electric heat tracing insulation pipeline. Carry out coal blending.

After adopting the above-mentioned structure, the beneficial effects of this specific embodiment are: this specific embodiment provides a safe, simple, efficient and environmentally friendly tar purification and solid waste treatment process, and the whole process is crushing tar residue in a closed pipeline environment , Separation and transportation. There is no leakage point in the whole process, which is safe, environmentally friendly and reliable. The tar residue is separated by means of a centrifuge, and then the solid waste - tar residue is directly transported to the coal tower for coal blending in the form of a pump. This method solves the problem of manual removal of slag from the bottom of the traditional tar tank, as well as the problem of oil slag leakage and pollution on the ground caused by the traditional tar slag transportation method, and reduces the labor and vehicle loss in this process. The tar purified by the new process is clean and the moisture content of the tar is below 2%. It can be directly used as a finished product for subsequent deep processing of tar. There is no need to purify the oil again.

The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those skilled in the art to the technical solution of the present invention should be considered as long as they do not depart from the spirit and scope of the technical solution of the present invention. fall within the scope of the claims of the present invention.

Claims (6)

1. a kind of tar purification of succinct high-efficiency environment friendly of safety and its fixed-end forces technique, it is characterised in that：It includes coke oven stove Group, the sprinkling of coke oven gas collecting tube, tar and ammonia water separation hopper, preseparator, tar storage tank, gas-liquid separator, tar slag delivery pump, Jiao Oily press pump, Three-phase decanter centrifuge, centrifuge feed pump；The gas outlet of coke oven stove group is connected with the sprinkling of coke oven gas collecting tube, burnt The outlet of stove gas collecting tube sprinkling is connected with gas-liquid separator, and the coagulant liquid outlet of gas-liquid separator is connected with preseparator, pre- point Tar slag outlet from device is connected with tar press pump, and the discharge port of tar press pump is connected with preseparator, while pre-separation The liquid outlet of device is connected with tar and ammonia water separation hopper, and the oil outlet of tar and ammonia water separation hopper is connected with tar storage tank, and tar ammonia Water separating tank with being equipped with centrifuge feed pump and Three-phase decanter centrifuge successively on the connecting line of tar storage tank；Wherein, three-phase The oil outlet of decanter centrifuge is connected with tar storage tank, insulation conical hopper tank and the Jiao of Three-phase decanter centrifuge slag notch bottom Dregs of fat delivery pump connects, and water outlet and the sprinkling of coke oven gas collecting tube of Three-phase decanter centrifuge connect；The discharging of tar slag delivery pump Mouth is connected with coke oven stove group；The water outlet of the tar and ammonia water separation hopper is connected with the sprinkling of coke oven gas collecting tube.

2. a kind of tar purification of the succinct high-efficiency environment friendly of safety according to claim 1 and its fixed-end forces technique, it is special Sign is：The gas outlet of the gas-liquid separator is connected with gas cooler, and gas cooler is connected with air blower.

3. a kind of tar purification of the succinct high-efficiency environment friendly of safety according to claim 1 and its fixed-end forces technique, it is special Sign is：1000 DEG C of temperature ＞ in the coke oven stove group.

4. a kind of tar purification of the succinct high-efficiency environment friendly of safety according to claim 1 and its fixed-end forces technique, it is special Sign is：The preseparator inner inclination is equipped with sieving, the aperture ＞ 5mm of the sieving.

5. a kind of tar purification of the succinct high-efficiency environment friendly of safety according to claim 1 and its fixed-end forces technique, it is special Sign is：Bottom is equipped with agitating device in the preseparator.

6. a kind of tar purification of succinct high-efficiency environment friendly of safety and its fixed-end forces technique, it is characterised in that：Its operation principle： When the coal gas in coke oven stove group sprays the coal gas to be formed and condensate liquid passes through gas-liquid separator separates by coke oven gas collecting tube；Condensation For liquid by preseparator, the tar clinker more than 5mm enters tar press pump by way of gravitational settling, after attrition grinding, Tar slag granularity reaches 3mm or so, and tar press pump itself has 6 ~ 8m lifts, can be between tar press pump and preseparator Form continuous circulation；Tar slag and tar, ammonium hydroxide less than 5mm enter tar and ammonia water separation hopper, tar ammonia separation together Ammonium hydroxide is transported to coke oven gas collecting tube sprinkling system by three layers of mixed liquor point in groove, the ammonium hydroxide of the superiors by an ammonium hydroxide delivery pump Reuse, tar and the tar slag of uniting are pumped into Three-phase decanter centrifuge by desk centrifuge charging and separate, and the tar isolated is sent To tar storage tank；The ammonium hydroxide isolated is returned to coke oven gas collecting tube sprinkling system reuse, in the slag notch of Three-phase decanter centrifuge Do an insulation conical hopper tank, when the tar slag that Three-phase decanter centrifuge is isolated is filled in tapered shaped can, these slags in bottom Tar slag delivery pump can be entered from tank, by tar slag by way of 60 ~ 80 degree of electric tracing thermal insulation pipeline, be fed directly to Coal blending processing is carried out on the belt of coal tower.