Sewage blower energy-saving system and operation method

Abstract

The invention discloses a sewage blower energy-saving system and an operation method.The energy-saving system comprises a biochemical pool and a blower, an air outlet of the blower is communicated with the bottom of the biochemical pool, the energy-saving system further comprises a gas storage pool, and an aeration device is installed at the bottom of the gas storage pool; an air inlet of the aeration device is communicated with the other air outlet of the air blower through an aeration pipeline, a liquid inlet of the gas storage pool is communicated with a liquid outlet of the biochemical pool through a water inlet pipeline, and a liquid outlet of the gas storage pool is communicated with a liquid inlet of the biochemical pool through a water outlet pipeline. The oxygen-enriched water solution is prepared through the residual air quantity of the blower and stored in the gas storage pool, and subsequently introduced into the biochemical pool for oxygen supply, so that the total air supply demand of the blower is effectively reduced, and the energy consumption of the blower is reduced.

Description

Technical Field

[0001] The invention relates to the field of blowers, in particular to an energy-saving system and an operating method for a sewage blower. Background Art

[0002] Aeration in sewage treatment plants is an important technology in sewage treatment. Its purpose is to force air into the sewage tank so that the sewage in the tank is fully in contact with the air, thereby increasing the dissolved oxygen content in the water and accelerating the oxidation and decomposition of organic matter, suspended matter and pollutants in the sewage. Aeration technology can be widely used in various types of sewage treatment processes such as biological oxidation tanks and activated sludge tanks.

[0003] A Chinese patent with publication number CN109354156B discloses an aeration system for a biochemical sewage treatment tank, comprising a biochemical aeration tank, a stirring device arranged at the bottom of the biochemical aeration tank, and a plurality of aerator assemblies symmetrically arranged on the inner wall of the biochemical aeration tank, a blower unit connected to the aerator assembly through a pipeline system, the blower unit comprising at least one blower device, the blower device being connected to the aerator assembly through an electric two-way valve connecting pipeline A, a plurality of evenly arranged aerators arranged on an aeration pre-pressure pipe, and a plurality of dissolved oxygen meters arranged on the aeration pre-pressure pipe, and a host computer connected to the stirring device, the blower device and the dissolved oxygen meter, respectively.

[0004] There are many different ways to implement aeration technology. Among them, air blower aeration is a common aeration method. It uses a blower to transport air through a pipe to the aeration tank so that the sewage and air are fully in contact. The blower is a key equipment in the sewage treatment plant. Since the energy consumption of the blower accounts for more than half of the total energy consumption of the water treatment system, therefore, energy saving of the blower is of great significance.

[0005] When the sewage treatment plant has a low influent volume or good water quality, the minimum air volume of the blower is still higher than the aeration volume required for the sewage. At this time, overexposure will occur, which will not only cause unnecessary energy waste, but also affect the effluent quality. Due to the infiltration of external water, the mixing of rainwater and sewage, and the backflow of river and lake water in southern my country, the influent concentration of urban sewage treatment plants in southern China is generally lower than the design standard. In response to this situation, some sewage treatment plants adopt an intermittent aeration operation mode, but once aeration is stopped, a hypoxic state will occur, resulting in a decrease in microbial activity, too short aeration time, and incomplete nitrification reaction. Some sewage treatment plants add aeration devices at the end of aeration to reduce the impact of overexposure, but the problem of energy waste is not solved.

[0006] In addition, the long-term operation of the blower is also accompanied by equipment failure and increased maintenance costs. The system effectively reduces the gas supply demand of the blower in the biochemical reaction area through an innovative gas saturation method, thereby achieving the goal of energy conservation and emission reduction. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide an energy-saving system and an operating method for a sewage blower in view of the deficiencies in the prior art, so as to ensure the effluent water quality while reducing its operating energy consumption.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0009] A sewage blower energy-saving system comprises a biochemical pool and a blower, wherein the air outlet of the blower is connected to the bottom of the biochemical pool, and further comprises an air storage pool, wherein an aeration device is installed at the bottom of the air storage pool, wherein the air inlet of the aeration device is connected to another air outlet of the blower through an aeration pipeline, the liquid inlet of the air storage pool is connected to the liquid outlet of the biochemical pool through a water inlet pipeline, and the liquid outlet of the air storage pool is connected to the liquid inlet of the biochemical pool through a water outlet pipeline;

[0010] Preferably, the sewage blower energy-saving system comprises a controller, which controls the connection or disconnection of the water inlet pipe, the aeration pipe and the water outlet pipe respectively.

[0011] The present invention prepares high-concentration oxygenated water through a blower air supply bypass, directly introduces a solution containing a large amount of dissolved gas into a biochemical reaction zone, and simultaneously stops the blower, thereby reducing the air supply of the blower, thereby ensuring the quality of effluent water and reducing its operating energy consumption.

[0012] In a preferred embodiment of the present invention, the aeration device comprises a plurality of branch pipes, and aeration plates are installed on the branch pipes.

[0013] In a preferred embodiment of the present invention, a first valve is installed on the aeration pipeline.

[0014] In a preferred embodiment of the present invention, a water inlet valve is installed on the water inlet pipe.

[0015] In a preferred embodiment of the present invention, a water outlet valve is installed on the water outlet pipe;

[0016] Preferably, the controller is communicated with the water inlet valve, the first valve, and the water outlet valve, respectively, and controls the opening or closing of the water inlet valve, the first valve, and the water outlet valve, respectively.

[0017] The present invention also discloses an operating method of the sewage blower energy-saving system, comprising the following steps:

[0018] S1. When the aeration volume required by the biochemical pool exceeds the minimum air supply volume of the blower, part of the sewage from the biochemical pool is diverted to the air storage tank through the water inlet pipe;

[0019] S2, connecting the air inlet of the aeration device with another air outlet of the blower, deducting the excess air volume required for aeration in the biochemical pool from the air volume of the blower, and aerating the water in the air storage pool through the aeration device to increase the dissolved oxygen in the water of the air storage pool;

[0020] S3. When the water level of the gas storage pool reaches the highest level, the sewage from the biochemical pool will be stopped from being diverted to the gas storage pool;

[0021] S4. When the dissolved oxygen in the air storage pool is close to saturation, turn off the blower and introduce the oxygen-rich water in the air storage pool into the biochemical pool through the outlet pipe for oxygen supply.

[0022] In a preferred embodiment of the present invention, in S1, by closing the outlet valve of the gas storage pool and opening the inlet valve of the gas storage pool, a part of the sewage in the biochemical pool is diverted to the gas storage pool.

[0023] In a preferred embodiment of the present invention, in S2, the air inlet of the aeration device is connected to the other air outlet of the blower by opening the first valve on the aeration pipeline.

[0024] In a preferred embodiment of the present invention, in S3, the water inlet valve of the gas storage tank is closed to stop the sewage from the biochemical tank from being diverted to the gas storage tank.

[0025] In a preferred embodiment of the present invention, in S4, the oxygen-rich water in the gas storage water tank is introduced into the aerobic zone of the biochemical pool through the outlet pipe to supply oxygen by opening the outlet valve of the gas storage water tank.

[0026] In S1, the dissolved oxygen concentration range of the biochemical pool is set to a~b. When the air supply of the blower is reduced to the minimum, and the dissolved oxygen concentration in the aerobic zone of the biochemical pool still exceeds b, it is judged that the aeration volume required for the biochemical pool of the sewage plant exceeds the minimum air supply of the blower.

[0027] In S2, the opening of the first valve is adjusted until the dissolved oxygen concentration in the biochemical pool is stabilized to a target range, that is, the excess air volume of the blower is deducted from the aeration volume required for the biochemical pool.

[0028] In S4, the dissolved oxygen in the gas storage tank is close to saturation when the dissolved oxygen in the gas storage tank is close to the dissolved oxygen saturation value under the water temperature condition.

[0029] In S4, when the water in the air storage pool is completely used up, the blower is turned on to supply air to the biochemical pool. When the aeration volume required by the biochemical pool exceeds the minimum air supply volume of the blower, a new round of water intake and air storage operations in the air storage pool can be started.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1) Significantly reduce energy consumption: The oxygen-rich aqueous solution is prepared by the residual air volume of the blower and stored in the gas storage tank, and then introduced into the biochemical pool for oxygen supply, which effectively reduces the total air supply demand of the blower, thereby reducing the energy consumption of the blower.

[0032] 2) Improve the efficiency of biochemical reactions: The high concentration of gas in the oxygen-rich aqueous solution can quickly replenish the oxygen required for biochemical reactions, thereby improving the reaction speed and efficiency.

[0033] 3) Enhance system flexibility: The system can adapt to changes in water quality and water inflow, and improve operational stability and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of an embodiment of the present invention.

[0035] Figure 2 This is a dissolved oxygen diagram of a sewage blower energy-saving system in one embodiment of the present invention.

[0036] Among them, 1 is an oxygen-enriched water preparation system: 1-1 is an air storage tank, 1-2 is an aeration pipeline, 1-3 is an aeration plate, 1-4 is a first valve, and 1-5 is a branch pipe;

[0037] 2 is an oxygen-rich water delivery system: 2-1 is an inlet pipe, 2-2 is an inlet valve, 2-3 is an outlet pipe, and 2-4 is an outlet valve. DETAILED DESCRIPTION

[0038] like Figure 1 As shown, a sewage blower energy-saving system includes an oxygen-rich water preparation system 1 and an oxygen-rich water delivery system 2.

[0039] The oxygen-enriched water preparation system 1 is composed of an air storage tank 1-1, an aeration pipe 1-2 and an aeration plate 1-3. In the embodiment, the air storage tank 1-1 is arranged near the biochemical pool. The aeration plate 1-3 is located at the bottom of the biochemical pool, connected to the aeration pipe 1-2 and the water plant blower in sequence, and a first valve 1-4 with adjustable opening is installed on the aeration pipe 1-2.

[0040] The oxygen-enriched water delivery system 2 includes an inlet pipe 2-1, an inlet valve 2-2, an outlet pipe 2-3 and an outlet valve 2-4 of the gas storage tank 1-1. In this embodiment, the inlet pipe 2-1 is connected to the inlet pipe branch of the biochemical pool. The outlet pipe 2-3 is connected to the aerobic zone of the biochemical pool. The inlet pipe 2-1 and the outlet pipe 2-3 are respectively equipped with an inlet valve 2-2 and an outlet valve 2-4.

[0041] With the goal of controlling the dissolved oxygen concentration in the biochemical pool 1-1 to 1.5mg / L to 2mg / L, when the blower air supply is reduced to the minimum, and the dissolved oxygen concentration in the aerobic zone of the biochemical pool still exceeds 2mg / L, it is determined that the aeration volume required for the biochemical pool of the sewage treatment plant exceeds the minimum air supply volume of the blower. At this time, close the outlet valve 2-4 of the gas storage pool 1-1, open the inlet valve 2-2 of the gas storage pool 1-1, and allow part of the sewage treatment plant water to be diverted from the biochemical pool to the gas storage pool 1-1, and adjust the opening of the first valve 1-4 on the aeration pipe until the dissolved oxygen concentration in the biochemical pool stabilizes to the target range, that is, the excess air volume of the blower air volume minus the aeration volume required for the biochemical pool is aerated to the water body of the gas storage pool 1-1 through the aeration plate 1-3 to increase the dissolved oxygen in the water body of the gas storage pool 1-1. When the water in the air storage tank 1-1 reaches the highest water level, close the water inlet valve 2-2 of the air storage tank 1-1; by measuring the water temperature and dissolved oxygen concentration of the air storage tank 1-1, when the dissolved oxygen in the air storage tank 1-1 is close to the dissolved oxygen saturation value under the water temperature condition, close the blower, and open the water outlet valve 2-4 of the air storage tank 1-1 at the same time, and introduce the oxygen-rich water in the air storage tank 1-1 into the aerobic zone of the biochemical pool for oxygen supply. When the water in the air storage tank is completely used up, turn on the blower to supply air to the biochemical pool. When the aeration volume required by the biochemical pool exceeds the minimum air supply volume of the blower, a new round of water inlet and air storage operation of the air storage tank can be started.

[0042] Due to the adoption of the above technical solution, the oxygen-rich aqueous solution is prepared by the residual air volume of the blower and stored in the gas storage pool, and then introduced into the biochemical pool for oxygen supply, which effectively reduces the total air supply demand of the blower, thereby reducing the energy consumption of the blower. The water and electricity consumption per thousand tons of the blower in the embodiment is reduced by about 10% compared with the historical data of the same period. Figure 2 As shown, the high concentration of gas in the oxygen-rich aqueous solution can quickly replenish the oxygen required for the biochemical reaction, improve the reaction speed and efficiency, and the dissolved oxygen in the biochemical pool is stably maintained at 1.5-2 mg / L, improving the stability and reliability of the operation.

Claims

1. A sewage blower energy-saving system, comprising a biochemical pool (3) and a blower (4), wherein an air outlet of the blower (4) is connected to the bottom of the biochemical pool (3), characterized in that: It also comprises an air storage pool (1-1), an aeration device is installed at the bottom of the air storage pool (1-1), the air inlet of the aeration device is connected to the other air outlet of the blower (4) through an aeration pipe (1-2), the liquid inlet of the air storage pool (1-1) is connected to the liquid outlet of the biochemical pool (3) through a water inlet pipe (2-1), and the liquid outlet of the air storage pool (1-1) is connected to the liquid inlet of the biochemical pool (3) through a water outlet pipe (2-3); Preferably, the sewage blower energy-saving system comprises a controller, which controls the connection or disconnection of the water inlet pipe, the aeration pipe and the water outlet pipe respectively.

2. The sewage blower energy-saving system according to claim 1, characterized in that: The aeration device comprises a plurality of branch pipes (1-5), and an aeration plate (1-3) is installed on the branch pipes (1-5).

3. The sewage blower energy-saving system according to claim 2, characterized in that: A first valve (1-4) is installed on the aeration pipeline (1-2).

4. The sewage blower energy-saving system according to claim 3, characterized in that: A water inlet valve (2-2) is installed on the water inlet pipeline (2-1).

5. The sewage blower energy-saving system according to claim 4, characterized in that: A water outlet valve (2-4) is installed on the water outlet pipe (2-3); Preferably, the controller is communicated with the water inlet valve, the first valve, and the water outlet valve, respectively, and controls the opening or closing of the water inlet valve, the first valve, and the water outlet valve, respectively.

6. An operating method of a sewage blower energy-saving system according to any one of claims 1 to 5, characterized in that The following steps are involved: S1. When the aeration volume required by the biochemical pool (3) exceeds the minimum air supply volume of the blower (4), a portion of the sewage from the biochemical pool (3) is diverted to the air storage pool (1-1) through the water inlet pipe (2-1); S2, connecting the air inlet of the aeration device with the other air outlet of the blower (4), deducting the excess air volume of the blower (4) required for aeration of the biochemical pool (3) from the air volume of the blower (4), and aerating the water in the air storage pool (1-1) through the aeration device to increase the dissolved oxygen in the water of the air storage pool (1-1); S3. When the water level of the gas storage tank (1-1) reaches the highest level, the sewage from the biochemical tank (3) is stopped from being diverted to the gas storage tank (1-1); S4. When the dissolved oxygen in the gas storage pool (1-1) is close to saturation, the blower (4) is turned off, and the oxygen-rich water in the gas storage pool (1-1) is introduced into the biochemical pool (3) through the outlet pipe (2-3) for oxygen supply.

7. The method for operating the sewage blower energy-saving system according to claim 6, characterized in that: In S1, the outlet valve (2-4) of the gas storage pool (1-1) is closed and the inlet valve (2-2) of the gas storage pool (1-1) is opened, so that part of the sewage in the biochemical pool (3) is diverted to the gas storage pool (1-1).

8. The method for operating the sewage blower energy-saving system according to claim 6, characterized in that: In S2, the air inlet of the aeration device and the other air outlet of the blower (4) are connected by opening the first valve (1-4) on the aeration pipeline (1-2).

9. The method for operating the sewage blower energy-saving system according to claim 6, characterized in that: In S3, the water inlet valve (2-2) of the gas storage tank (1-1) is closed, so that the sewage from the biochemical pool (3) is temporarily stopped from being diverted to the gas storage tank (1-1).

10. The method for operating the sewage blower energy-saving system according to claim 6, characterized in that: In S4, the water outlet valve (2-4) of the air storage water tank (1-1) is opened to introduce the oxygen-rich water in the air storage water tank (1-1) into the aerobic zone of the biochemical pool (3) through the water outlet pipe (2-3) for oxygen supply.

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