Biological desulfurization device for recovering elemental sulfur

Abstract

The utility model relates to the technical field of desulfurization equipment, in particular to a biological desulfurization device for recovering elemental sulfur, which is characterized in that a gas-liquid distributor is arranged above a bioreactor, a sulfur precipitation tank is arranged below the bioreactor, and raw materials uniformly enter the bioreactor after passing through the gas-liquid distributor; and elemental sulfur particles generated by biological reaction enter a sulfur precipitation tank. The device disclosed by the utility model has the beneficial effects that high-efficiency recovery of sulfur and stable operation of the system are realized through gas-liquid distribution optimization, carrier immobilized microorganisms and the high-efficiency sulfur separation module.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization equipment technology, and in particular to a biological desulfurization device for recovering elemental sulfur. Background Technology

[0002] Traditional desulfurization methods (such as chemical oxidation) are costly and prone to secondary pollution. While biological desulfurization is environmentally friendly, existing equipment suffers from low sulfur recovery efficiency.

[0003] To address this issue, this application presents a biological desulfurization device for recovering elemental sulfur. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this utility model provides a biological desulfurization device for recovering elemental sulfur.

[0005] A biological desulfurization device for recovering elemental sulfur, comprising a bioreactor, characterized in that:

[0006] A gas-liquid distributor is installed above the bioreactor, and a sulfur precipitation tank is installed below the bioreactor. The raw materials enter the bioreactor evenly after passing through the gas-liquid distributor, and the elemental sulfur particles produced by the biological reaction enter the sulfur precipitation tank.

[0007] Furthermore, in order to better realize this utility model, the bioreactor is a cylindrical shell structure, which is filled with a porous microbial carrier containing sulfur-oxidizing bacteria.

[0008] Furthermore, in order to better realize this utility model, the gas-liquid distributor is connected to an external feed pipe, and the gas-liquid distributor is conical with micropores on its surface.

[0009] Furthermore, in order to better realize this utility model, the sulfur precipitation tank includes a centrifuge or membrane filter set in the middle. The gap between the centrifuge or membrane filter and the sulfur precipitation tank shell is a waste liquid chamber. The centrifuge or membrane filter receives sulfur particles falling from above with the liquid. After the centrifuge or membrane filter discharges water into the waste liquid chamber, the sulfur particles inside fall into the elemental sulfur collection chamber connected below.

[0010] Furthermore, in order to better realize this utility model, the waste liquid chamber is connected to a gas-liquid distributor through a circulation pipe and a circulation pump, so that the waste liquid still containing sulfur is sent back in for reaction.

[0011] The beneficial effects of this utility model are:

[0012] The device of this invention achieves efficient sulfur recovery and stable system operation through gas-liquid distribution optimization, carrier immobilization of microorganisms, and a high-efficiency sulfur separation module. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a cross-sectional view of the present invention;

[0015] Figure 3 For the present utility model Figure 1 A three-dimensional structural diagram of the reactor without its outer shell.

[0016] In the picture,

[0017] 1. Bioreactor, 2. Porous microbial carrier, 3. Gas-liquid distributor, 4. Sulfur precipitation tank, 5. Centrifuge, 6. Waste liquid chamber, 7. Elemental sulfur collection bin, 8. Circulation pump, 9. Circulation pipe, 10. Feed pipe. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Example 1: Treatment of sulfur-containing biogas (corresponding) Figures 1-3 )

[0021] 1. Equipment Configuration

[0022] Bioreactor 1: Cylindrical fiberglass material, 1.2m in diameter and 3m in height, filled with 8mm diameter activated carbon porous microbial carrier 2, with sulfur-oxidizing bacteria (Thiobacillus thioparus) loaded on the surface of the carrier.

[0023] Gas-liquid distributor 3: Conical stainless steel structure, with feed pipe 10 connected to the top, and micropores with a diameter of 1.5mm evenly distributed on the surface, and the gas flow rate is controlled at 0.6m³ / h.

[0024] Sulfur precipitation tank 4: A centrifuge 5 is installed at the bottom, with a centrifuge speed of 2500 rpm. The waste liquid chamber 6 is connected to the gas-liquid distributor 3 through a circulation pipe 9 and a circulation pump 8. An electrically controlled gate is installed at the bottom of the centrifuge 5. After the gate is opened, the sulfur particles inside enter the elemental sulfur collection chamber 7 below.

[0025] 2. Operation Process

[0026] Step 1: Biogas containing H2S enters the gas-liquid distributor 3 through the feed pipe 10, and rises evenly to the bioreactor 1 after being dispersed through micropores.

[0027] Step 2: H2S is oxidized to elemental sulfur on the surface of microbial carrier 2. The reaction conditions are a temperature of 35℃ (maintained by an external temperature control sleeve) and a pH of 8.0 (adjusted by automatically adding NaOH solution).

[0028] Step 3: The sulfur-containing liquid flows into the sulfur precipitation tank 4, and the centrifuge 5 separates the sulfur particles into the elemental sulfur collection bin 7. The waste liquid is returned to the reactor for recycling.

[0029] Example 2: Treatment of sulfur-containing wastewater from oil refineries (corresponding to...) Figures 1-3 )

[0030] 1. Equipment Configuration

[0031] Bioreactor 1: A cylindrical shell made of PP material, 0.8m in diameter and 2.5m in height, filled with a 10mm diameter porous ceramic carrier 2, loaded with Acidithiobacillus caldus.

[0032] Sulfur precipitation tank 4: uses a ceramic membrane filter (pore size 0.5μm), and the waste liquid chamber 6 is circulated by pump 8 with a return flow rate of 30% of the total treatment capacity per hour.

[0033] 2. Operation Process

[0034] Step 1: Sulfur-containing wastewater (sulfide concentration 1200 mg / L) enters the reactor through gas-liquid distributor 3, with a hydraulic retention time (HRT) of 10 hours.

[0035] Step 2: Microorganisms oxidize sulfides into elemental sulfur at pH 7.5-8.2 and temperature 38℃, and the sulfur particles flow with the water to the membrane filter.

[0036] Step 3: The membrane filter traps sulfur particles (particle size > 30 μm), the filtrate is returned to the reactor, and the moisture content of sulfur collection bin 7 is < 8%.

[0037] Key implementation details

[0038] 1. Guarantee of microbial activity:

[0039] Nutrient solution (NH4Cl 0.1g / L, K2HPO4 0.05g / L) is added to the reactor every two weeks.

[0040] The carrier is backwashed once a month with a backwash water pressure of 0.2 MPa.

[0041] 2. Energy consumption optimization:

[0042] The circulating pump 8 operates intermittently (on for 30 minutes / off for 15 minutes) to reduce power consumption;

[0043] Utilize waste heat (such as hot water from an oil refinery) to maintain the reaction temperature and reduce heating energy consumption.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A biological desulfurization device for recovering elemental sulfur, comprising a bioreactor (1), characterized in that: A gas-liquid distributor (3) is installed above the bioreactor (1), and a sulfur precipitation tank (4) is installed below the bioreactor (1). The raw materials enter the bioreactor (1) evenly after passing through the gas-liquid distributor (3), and the elemental sulfur particles generated by the biological reaction enter the sulfur precipitation tank (4).

2. The biological desulfurization device for recovering elemental sulfur according to claim 1, characterized in that: The bioreactor (1) is a cylindrical shell structure, which is filled with a porous microbial carrier (2) containing sulfur-oxidizing bacteria.

3. The biological desulfurization device for recovering elemental sulfur according to claim 1, characterized in that: The gas-liquid distributor (3) is connected to the external feed pipe (10). The gas-liquid distributor (3) is conical and has micropores on its surface.

4. The biological desulfurization device for recovering elemental sulfur according to claim 1, characterized in that: The sulfur precipitation tank (4) includes a centrifuge (5) or membrane filter located in the middle. The gap between the centrifuge (5) or membrane filter and the housing of the sulfur precipitation tank (4) is a waste liquid chamber (6). The centrifuge (5) or membrane filter receives sulfur particles falling from above with the liquid. After the centrifuge (5) or membrane filter discharges water into the waste liquid chamber (6), the sulfur particles inside fall into the elemental sulfur collection chamber (7) connected below.

5. The biological desulfurization device for recovering elemental sulfur according to claim 4, characterized in that: The waste liquid chamber (6) is connected to the gas-liquid distributor (3) through the circulation pipe (9) and the circulation pump (8), so that the waste liquid that still contains sulfur is sent back in for reaction.

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