CN201648109U - A Biogas Production-Desulfurization Integrated Device - Google Patents

Abstract

The utility model discloses a biogas production-desulfurization integrated device. Its main body includes biogas production zone I, three-phase separation zone II, elemental sulfur separation zone III and biogas desulfurization zone IV. There is a sludge discharge pipe at the bottom of the biogas production area, and a water inlet pipe, a sampling pipe and a return pipe on the wall of the reaction cylinder; a sludge settling chamber, an inverted funnel-shaped three-phase separator and a first air chamber are arranged inside the three-phase separation area , there are overflow outlet pipes and spray liquid return pipes on the wall of the cylinder; there is an inclined plate type spray liquid storage tank inside the elemental sulfur separation area, and an air input pipe, a biogas input pipe and a tapered cloth are arranged longitudinally on the storage tank plate. There is a spray liquid level pipe in the center of the storage tank, and a gas monitoring sampling pipe and a sulfur discharge pipe are installed on the outside of the cylinder wall; the desulfurization cylinder in the biogas desulfurization area is equipped with biological fillers, disc sprinklers and a third gas chamber, and a methane output pipe is arranged on the cylinder wall. In the utility model, the anaerobic reactor and the biological desulfurization device are integrated, and H ₂ S is removed in the gas phase, which can promote the release of H ₂ S in the liquid phase.

Description

A Biogas Production-Desulfurization Integrated Device

technical field

The utility model relates to an anaerobic treatment device for organic waste water, in particular to a biogas production-desulfurization integrated device.

Background technique

Biogas fermentation is one of the important means of organic wastewater treatment. Biogas fermentation technology is favored by environmental engineering circles due to low operating costs, low sludge output, and recyclable biogas. Domestic sewage contains 3-6mg/L organic sulfur and 30-60mg/L inorganic sulfur, and the sulfate content of some industrial organic wastewater (such as pulp wastewater, tannery wastewater, pharmaceutical wastewater, etc.) is even as high as 9000mg/L or more. During the anaerobic biological treatment of these sulfur-containing wastewater, a large amount of hydrogen sulfide gas will be produced, with a concentration of about 1-20 g/m ³ . Hydrogen sulfide is a highly toxic and harmful gas. In the air and under humid environment conditions, hydrogen sulfide has a strong corrosive effect on pipes, burners, and other metal equipment, instruments, etc.; hydrogen sulfide combustion produces sulfur dioxide, which can directly affect human health; Strong corrosive effect. Biogas desulfurization is an indispensable treatment process in biogas production.

The methods of biogas desulfurization include chemical method, physicochemical method and biological method. At present, the desulfurization technology commonly used in China's biogas projects is mainly based on physical and chemical methods (commonly known as dry desulfurization), that is, using ferric oxide desulfurizer to remove H ₂ S in biogas. At normal temperature, biogas passes through the bed of desulfurizer, hydrogen sulfide contacts with active iron oxide to generate iron trisulfide, and then contacts with air, and the iron sulfide is converted into iron oxide and elemental sulfur. Such a desulfurization regeneration process can be cycled many times until most of the pores on the surface of the iron oxide desulfurizer are covered with sulfur or other impurities and lose their activity. The iron oxide dry desulfurization process is simple, mature and reliable, and the cost is low (the cost of a 25m ³ desulfurization tower is about 80,000), which can achieve a high degree of purification. However, the treatment cost of this method is high (about 15 yuan/kg (H ₂ S)), the operation is troublesome (the desulfurizer needs to be replaced or regenerated once every 4 to 6 months), and the waste desulfurizer has secondary pollution problems .

Compared with physical and chemical methods, biological desulfurization has the characteristics of simple equipment, low cost, environmental protection and cleanness, and recyclable elemental sulfur. It is a desulfurization technology with great development potential. The so-called biological desulfurization is to convert hydrogen sulfide into elemental sulfur or sulfuric acid through the metabolism of sulfur bacteria under suitable temperature, humidity, nutrition and oxygen supply conditions. The reaction process is:

H ₂ S+2O ₂ ——H ₂ SO ₄

2H ₂ S+O ₂ —— 2S°+2OH ^-

Combining biogas production and biogas desulfurization to develop biogas bio-desulfurization integrated device can not only simplify the equipment and save the biogas delivery pump, but also relieve the inhibitory effect of hydrogen sulfide on anaerobic digestion in situ and improve the anaerobic reaction The adaptability of the device to sulfur-containing wastewater.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies of the prior art and provide a biogas production-desulfurization integrated device.

Biogas production-desulfurization integrated device includes biogas production device and biogas desulfurization device, biogas production device includes biogas production area I and three-phase separation area II, biogas desulfurization device includes elemental sulfur separation area III and biogas desulfurization area IV, biogas production area I There is a sludge discharge pipe at the bottom, and a water inlet pipe, a sampling pipe and a return pipe are arranged on the wall of the reaction cylinder from bottom to top; a sludge settling chamber, an inverted funnel-shaped three-phase The phase separator and the first air chamber, the overflow outlet pipe and the spray liquid return pipe are arranged on the outside of the cylinder wall of the three-phase separation area; the inclined plate type spray liquid storage tank is installed inside the elemental sulfur separation area III, There are air input pipe, biogas input pipe and conical air distributor longitudinally on the inclined plate surface of the tank, a spray liquid level pipe is installed in the center of the inclined plate, and a second air chamber is arranged above the inclined plate spray liquid storage tank The gas monitoring sampling pipe and sulfur discharge pipe are installed outside the wall of elemental sulfur separation zone III; the main body of biogas desulfurization zone IV is a desulfurization cylinder, and the interior of the desulfurization cylinder is sequentially equipped with biological fillers, disc sprinklers and the third The gas chamber and the wall of the desulfurization cylinder are provided with biogas output pipes, and the disc-shaped spray head is connected with the external circulating spray pump through the delivery pipe.

The volume ratio of the biogas production unit to the biogas desulfurization unit is 2.5:1˜5:1. The upper end of the spray liquid level pipe is flush with the liquid surface in the inclined plate type spray liquid storage tank, the conical air distributor is 2-4cm higher than the liquid level in the inclined plate type spray liquid storage tank, and the spray liquid level The lower end of the tube is immersed 3 to 4 cm below the surface of the fermented liquid in the three-phase separation zone II. The angle α between the inclined plate and the horizontal plane of the inclined plate spray liquid storage tank is 20° to 30°, and the inclined plate of the inclined plate spray liquid storage tank is low. The end is connected with the sulfur discharge pipe, and the nozzle of the spray liquid return pipe is set at 5 cm below the liquid surface of the fermentation broth in the three-phase separation zone II.

The beneficial effects of the utility model are as follows: ①The anaerobic reactor and the biological desulfurization device are integrated, and the biogas is desulfurized while generating, without air pump transportation; ②Using the biogas fermentation liquid as the spray liquid, the nutrients in the fermentation liquid can be used Save cost, and use the alkalinity in the fermentation broth to enhance the absorption of H ₂ S; ③ oxidize H ₂ S to elemental sulfur, which can recover sulfur resources; ④ Remove H ₂ S in the gas phase, which can promote H ₂ in the liquid phase S release, thereby alleviating the inhibition of H ₂ S in the biogas production area; ⑤Chemical conversion and biological conversion are carried out at the same time, the biogas desulfurization rate is fast, and the treatment effect is good.

Description of drawings

Fig. 1 is a structural schematic diagram of a biogas production-desulfurization integrated device;

Fig. 2 is a sectional view of the inclined plate type spray liquid storage tank of the present invention.

In the figure: sludge discharge pipe 1, water inlet pipe 2, reaction cylinder 3, sampling pipe 4, return pipe 5, sludge settling chamber 6, inverted funnel-shaped three-phase separator 7, overflow outlet pipe 8, spray liquid level pipe 9. First air chamber 10, air input pipe 11, biogas input pipe 12, gas monitoring sampling pipe 13, second air chamber 14, biological filler 15, disk-shaped sprinkler head 16, third air chamber 17, biogas output pipe 18. Circulating spray pump 19, desulfurization cylinder 20, conical air distributor 21, sloping plate type spray liquid storage tank 22, sulfur discharge pipe 23 and spray liquid return pipe 24.

Detailed ways

As shown in Figure 1, the biogas production-desulfurization integrated device includes a biogas production device and a biogas desulfurization device, the biogas production device includes a biogas production area I and a three-phase separation area II, and the biogas desulfurization device includes an elemental sulfur separation area III and a biogas desulfurization area IV, the bottom of the biogas production area I is provided with a sludge discharge pipe 1, and the wall of the reaction cylinder 3 is provided with a water inlet pipe 2, a sampling pipe 4 and a return pipe 5 from bottom to top; A sludge settling chamber 6, an inverted funnel-shaped three-phase separator 7 and a first air chamber 10 are provided, and an overflow outlet pipe 8 and a spray liquid return pipe 24 are provided on the outside of the cylinder wall of the three-phase separation area; inside the elemental sulfur separation area III There is a slant plate type spray liquid storage tank 22, and the slant plate type spray liquid storage tank 22 is provided with an air input pipe 11, a biogas input pipe 12 and a conical air distributor 21 longitudinally on the slant plate surface of the slant plate type spray liquid storage tank 22, and the center of the slant plate is provided with The spray liquid level pipe 9, the second gas chamber 14 is arranged above the inclined plate spray liquid storage tank 22, the gas monitoring sampling pipe 13 and the sulfur discharge pipe 23 are arranged on the outside of the cylinder wall of the elemental sulfur separation zone III; the biogas desulfurization zone IV The main body is a desulfurization cylinder 20, and the inside of the desulfurization cylinder 20 is provided with a biological filler 15, a disc-shaped spray head 16 and a third air chamber 17 in sequence from bottom to top. The shower head is connected with the external circulating spray pump 19 through the delivery pipe.

The volume ratio of the biogas production unit to the biogas desulfurization unit is 2.5:1˜5:1. The upper end of the spray liquid level pipe 9 is flush with the liquid surface in the inclined plate type spray liquid storage tank 22, and the conical air distributor 21 is 2 to 4 cm higher than the liquid level in the inclined plate type spray liquid storage tank 22. The lower end of the shower liquid level pipe 9 is immersed in the three-phase separation zone II fermentation liquid for 3 to 4 cm, and the angle α between the inclined plate and the horizontal plane of the inclined plate type spray liquid storage tank 22 is 20° to 30°, and the inclined plate type spray liquid storage tank The lower end of the inclined plate of 22 links to each other with the sulfur exhaust pipe 23, and the mouth of the nozzle of the spray liquid return pipe 24 is located at 5 cm below the liquid surface of the fermented liquid in the three-phase separation zone II.

The working process of the present utility model is as follows

The utility model is divided into five system working processes, which are as follows:

(1) Biogas production system. It mainly includes mud discharge area 1, water inlet pipe 2, reaction cylinder 3, sampling pipe 4, return pipe 5, inverted funnel-shaped three-phase separator 7 and overflow outlet pipe 8. After the wastewater enters the biogas production zone I, biogas is produced by microorganisms, and the granular sludge enters the inverted funnel-shaped three-phase separator with the rising biogas and wastewater to realize the three-phase separation of gas, liquid and solid. The biogas further enters the biogas desulfurization device, and the effluent after treatment is discharged from the reactor through the overflow outlet pipe. The reflux of the fermentation broth through the reflux pipe 5 can promote the release of H ₂ S in the liquid phase.

(2) Air biogas intake and mixing system. The air input pipe 11, the biogas input pipe 12 and the conical air distributor 21 form a nested combination, and the rising air forms a certain degree of vacuum in the conical air distributor, which can extract the first air chamber 10 below it. The effect can promote the release of hydrogen sulfide in the liquid phase. The cone-shaped air distributor is distributed in a disc shape. After the air and biogas pass through the cone-shaped air distributor, they are fully mixed in the second air chamber, and then rise through the packing 15. Under appropriate temperature, humidity, nutrition and oxygen supply conditions, microorganisms After the desulfurization reaction is completed, the purified biogas is discharged through the biogas output pipe 18 .

(3) Biological filler system. The desulfurization cylinder 20 is filled with steel ball packing to form a three-dimensional network structure for the growth of microorganisms. The iron in the filler chemically reacts with the hydrogen sulfide in the gas phase and the sulfide in the spray liquid to fix the sulfur. Under the appropriate temperature, humidity, nutrition and oxygen supply conditions, the microorganisms attached to the surface of the filler will be fixed. Sulfur is converted to elemental sulfur or sulfate. Desulfurization is performed while fixing sulfur, and the surface of the desulfurizer is constantly updated. Combining rapid chemical fixation and biotransformation, the desulfurization effect is good and the rate is fast.

(4) Elemental sulfur collection and discharge system. The angle between the inclined plate spray liquid storage tank 22 and the horizontal plane is 20-30°, the elemental sulfur washed off by the spray liquid enters the inclined plate spray liquid storage tank 22, and under the action of gravity, the elemental sulfur washed down is transferred to The bottom of the inclined plate spray liquid storage tank 22 is discharged through the sulfur discharge pipe 23, and the spray liquid flows back from the spray liquid level pipe to the three-phase separation zone II.

(5) Oxygen supply system. The oxygen in the biogas is monitored by the oxygen measuring probe, and the aeration volume is adjusted by the gas rotameter to ensure that the oxygen content in the biogas desulfurization device meets the requirements of biological desulfurization, and realize the conversion of hydrogen sulfide to elemental sulfur, so as to achieve the recovery of elemental sulfur the goal of.

Claims (3)

1. biogas production-desulfurization integrated device, it is characterized in that comprising biogas production device and methane-desulfurizing device, the biogas production device comprises biogas production district I and three-phase separation area II, methane-desulfurizing device comprises elemental sulfur separation area II I and biogas desulfurization district IV, I bottom in biogas production district is provided with shore pipe (1), is provided with water inlet pipe (2), stopple coupon (4) and return line (5) on the wall of reaction tube (3) from top to bottom successively; Three-phase separation area II inside is provided with sludge settling chamber (6), the triphase separator of falling the funnel-form (7) and first air chamber (10) from top to bottom successively, and the three-phase separation area II barrel outside is provided with and overflows water pipe (8) and spray liquid return line (24); Elemental sulfur separation area II I inside is provided with ramp type spray liquid storage tank (22), vertically be provided with air input tube (11), biogas input tube (12) and taper gas pipe (21) on the swash plate plate face of ramp type spray liquid storage tank (22), the swash plate center is provided with spray liquid liquid level tube (9), swash plate spray liquid storage tank (22) top is provided with second air chamber (14), and the elemental sulfur separation area II I barrel outside is provided with gas-monitoring sampling tube (13) and sulphur discharging pipeline (23); IV main body in biogas desulfurization district is desulfurization tube (20), desulfurization tube (20) inside is provided with biologic packing material (15), dish-type spray header (16) and the 3rd air chamber (17) from top to bottom successively, the wall of desulfurization tube (20) is provided with biogas output tube (18), and the dish-type spray header links to each other by the circulated sprinkling pump (19) of transfer lime with the outside.

2. biogas production-desulfurization integrated device according to claim 1 is characterized in that: the volume ratio of described biogas production device and methane-desulfurizing device is 2.5: 1～5: 1.

3. biogas production-desulfurization integrated device according to claim 1, it is characterized in that: described spray liquid liquid level tube (9) upper end flushes with the interior fluid surface of ramp type spray liquid storage tank (22), taper gas pipe (21) is than the high 2～4cm of the interior liquid level of ramp type spray liquid storage tank (22), 3～4cm under the fermented liquid liquid level at immersion three-phase separation area II place, spray liquid liquid level tube (9) lower end, the swash plate of ramp type spray liquid storage tank (22) and horizontal plane angle α are 20 °～30 °, the swash plate low side of ramp type spray liquid storage tank (22) links to each other with sulphur discharging pipeline (23), and spray liquid return line (24) mouth of pipe is located at 5cm under the three-phase separation area II fermented liquid liquid level.

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