Energy-saving low-temperature heat exchange sewage treatment equipment

Abstract

The utility model provides energy-saving low-temperature heat exchange sewage treatment equipment. The energy-saving low-temperature heat exchange sewage treatment equipment comprises a biochemical area, a heat exchange area, a purification tower area and a flue gas duct assembly, the purification tower area is used for flue gas purification; the heat exchange area is used for heat exchange of energy; the purification tower area and the heat exchange area are connected through a flue gas duct assembly; the biochemical region comprises an anoxic tank, an aerobic tank and an MBR (Membrane Bioreactor) membrane tank; the three are communicated through a pipeline; wherein the anoxic tank is communicated with the heat exchange area through a pipeline; wherein the biochemical area and the heat exchange area are arranged in the box body. According to the change range of the water inlet temperature and the water volume; by adjusting the opening degree of the valve, flue gas enters in stages or continuously, so that the heat value of inlet sewage is increased, the activity of subsequent biochemical reaction microorganisms is enhanced, and the overall treatment capacity is improved, thereby ensuring the index of outlet water of integrated equipment.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, and in particular relates to energy-saving low-temperature heat exchange sewage treatment equipment. Background Art

[0002] Due to the vast territory and great differences in the geographical distribution of provinces in my country, many areas in my country have relatively low temperatures for 3-4 months, and some areas in the north have been in relatively low temperature conditions for more than 6 months. This also poses a severe and arduous challenge to low-temperature sewage treatment. Therefore, how to ensure the stable operation of sewage treatment equipment under low temperature conditions in winter is also an important issue. The consequences of operation under low temperature:

[0003] 1. Under low temperature conditions, the activity of proteins on the surface of microorganisms in activated sludge decreases, and the fluidity of the plasma membrane on its surface decreases, which is not conducive to the transportation of nutrients by microorganisms. The activity of nitrifying bacteria, polyphosphate bacteria and other microorganisms in the process of nitrogen and phosphorus removal will also be affected by temperature, and the growth rate will decrease, resulting in an increase in sludge age, resulting in the loss of these active microorganisms.

[0004] 2. Lower temperatures also inhibit the activity of enzymes in microorganisms, hindering the use of nutrients by microorganisms, preventing them from absorbing nutrients normally, thereby inhibiting their growth, causing the number of microbial flora in activated sludge to decrease and their activity to be greatly reduced. When the temperature drops below 4°C, microorganisms will gradually die.

[0005] 3. In addition to low oxygen and low load factors, low temperature is also an important factor affecting sludge bulking. Some protozoa in filamentous fungi are very suitable for growth under low temperature and low load conditions, and have hydrophobic characteristics. Therefore, low temperature becomes the main reason for sludge bulking caused by excessive growth of filamentous fungi.

[0006] 4. Under low temperature conditions, the metabolic and reproductive capacity of COD-degrading bacteria decreases, which directly leads to a decrease in the metabolic efficiency of sugar substances. Some sugar substances cannot be completely metabolized in the biochemical device and are adsorbed on the surface of bacteria, resulting in an increase in the sludge settling ratio, making it difficult to separate sludge and water. The probability of muddy mud in the effluent is greatly increased, which will cause the effluent COD, ammonia nitrogen, and total nitrogen to exceed the standard. Taking nitrifying bacteria as an example, nitrifying bacteria are more sensitive to water temperature. Nitrifying bacteria stop growing or die when the temperature is below 4°C. They can grow and reproduce normally in the range of 10-40°C, and grow and reproduce slowly at 10-15°C. As the temperature increases, the reproduction speeds up, and 25-37°C is the most suitable for growth and reproduction.

[0007] Commonly used measures include increasing sludge concentration, domesticating low-temperature resistant microorganisms, improving and improving sludge activity, adding biological targeted sedimentation aids, heating, and heat preservation measures. However, these methods not only require a large increase in drug and electricity costs, but also increase operating and management costs, but also play an auxiliary role. Under the condition that it is impossible to improve the sewage treatment equipment in advance, if you want to operate through the low temperature period, the most important thing is to control the front-end inlet temperature of the sewage. Utility Model Content

[0008] In view of this, the utility model aims to propose an energy-saving low-temperature heat exchange sewage treatment equipment to improve the operating environment of the sewage treatment equipment under low temperature conditions and improve the effect of sewage treatment. For sewage treatment equipment with surrounding heat sources, low-temperature heat exchange sewage treatment equipment can be used. This equipment can be suitable for both newly built equipment and renovated equipment, and can be used as an independent part to connect before and after the process to achieve heat energy exchange.

[0009] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0010] An energy-saving low-temperature heat exchange sewage treatment equipment, comprising a biochemical area, a heat exchange area, a purification tower area and a smoke and air duct component;

[0011] The purification tower area is used for flue gas purification; the heat exchange area is used for energy heat exchange; the purification tower area and the heat exchange area are connected by a smoke and air duct component;

[0012] The biochemical zone includes an anoxic pool, an aerobic pool and an MBR membrane pool; the three are connected by pipelines; the anoxic pool is connected to the heat exchange zone through a pipeline;

[0013] The biochemical area and the heat exchange area are both installed in the box.

[0014] Further, the heat exchange area includes an upper header main pipeline, a lower header main pipeline, a serpentine fin tube, an annular fixing plate, a steel section, a channel steel and a fixing blind plate;

[0015] The annular fixing plate, several steel sections and the fixing blind plate are installed on the inner wall of the box to form a frame structure, and the serpentine fin tube is installed to the middle of the frame structure through the channel steel;

[0016] The pretreated sewage is connected to the upper part of the serpentine fin tube through the main pipeline of the upper header tank; the lower part of the serpentine fin tube is connected to the anoxic tank of the biochemical area through the main pipeline of the lower header tank.

[0017] Furthermore, the purification tower area includes a tower body, a flue gas inlet is provided at the lower part of the tower body, and a flue gas outlet is provided at the top of the tower body; the interior of the tower is provided with a spray layer, a lower flushing water assembly, a baffle, an upper flushing water assembly, a tube bundle demister and a backwash assembly from bottom to top;

[0018] A main flue is provided between the backwash component and the flue gas outlet; the main flue is connected with the heat exchanger through the smoke and air duct component.

[0019] Furthermore, the smoke and air duct assembly includes a smoke inlet pipe and a smoke outlet pipe, the main smoke duct is connected to the lower part of the heat exchange zone through the smoke inlet pipe, and the upper part of the heat exchange zone is connected to the main smoke duct through the smoke storage tank;

[0020] The smoke inlet pipe is provided with a smoke check valve and a smoke regulating valve; the smoke outlet pipe is also provided with a smoke check valve and a smoke regulating valve;

[0021] The smoke and air duct components form a smoke circulation system.

[0022] Compared with the prior art, the energy-saving low-temperature heat exchange sewage treatment equipment described in the utility model has the following advantages:

[0023] (1) The utility model is an energy-saving low-temperature heat exchange sewage treatment equipment. After the domestic sewage is pre-treated at the front end, according to the range of the inlet water temperature and the water volume, the flue gas can be introduced in stages or continuously by adjusting the opening of the valve to increase the calorific value of the inlet sewage, enhance the activity of the subsequent biochemical reaction microorganisms, and improve the overall treatment capacity, thereby ensuring the water output index of the integrated equipment.

[0024] (2) The utility model is an energy-saving low-temperature heat exchange sewage treatment equipment that can improve treatment efficiency: by transferring heat from flue gas to sewage, the sewage treatment efficiency can be effectively improved. This heat exchange process helps to improve parameters such as sewage temperature and pH value, which helps the growth and reproduction of microorganisms, thereby improving sewage treatment efficiency.

[0025] (3) The utility model is an energy-saving low-temperature heat exchange sewage treatment equipment, which can save energy: by recovering the heat in the flue gas and using it in the sewage treatment process, it can reduce energy consumption and heat medium loss, thereby achieving energy conversion and balance.

[0026] (4) The utility model is an energy-saving low-temperature heat exchange sewage treatment equipment that can reduce pollution: using a heat exchanger to exchange heat with sewage can reduce the pollutant content in the sewage. By transferring heat from the flue gas to the sewage, the chemical and physical properties of the sewage can be changed, which helps to improve the pollutant removal rate and thus reduce the impact on the environment.

[0027] (5) The utility model is an energy-saving low-temperature heat exchange sewage treatment equipment, which can improve the utilization rate of the equipment: using a heat exchanger to exchange heat with sewage can fully utilize the potential of the equipment. By transferring the heat in the flue gas to the sewage, the processing capacity of the equipment can be increased and the utilization rate of the equipment can be improved. It is particularly suitable for sewage treatment at low temperatures in northern regions in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of an energy-saving low-temperature heat exchange sewage treatment equipment according to an embodiment of the utility model;

[0030] Figure 2 For the embodiment of the utility model Figure 1 Sectional view of the AA plane;

[0031] Figure 3 This is a schematic diagram of the interior of the purification tower area described in an embodiment of the utility model;

[0032] Figure 4 This is a schematic diagram of the air duct assembly described in an embodiment of the utility model;

[0033] Figure 5 This is a process flow chart of an energy-saving low-temperature heat exchange sewage treatment equipment described in an embodiment of the utility model.

[0034] Description of reference numerals:

[0035] 1. Heat exchange area; 11. Upper header main pipeline; 12. Lower header main pipeline; 13. Serpentine fin tube; 14. Annular fixed plate; 15. Steel; 16. Channel steel; 17. Fixed blind plate; 2. Purification tower area; 21. Tower body; 22. Flue gas inlet; 23. Flue gas outlet; 24. Spray layer; 25. Lower flushing water assembly; 26. Baffle; 27. Upper flushing water assembly; 28. Tube bundle demister; 29. ​​Backwash assembly; 210. Main flue; 3. Air duct assembly; 31. Flue gas inlet pipe; 32. Flue gas outlet pipe; 33. Flue gas check valve; 34. Flue gas regulating valve; 4. Biochemical area; 41. Anoxic tank; 42. Aerobic tank; 43. MBR membrane tank. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] An energy-saving low-temperature heat exchange sewage treatment equipment, such as Figure 1-Figure 5 As shown, it includes a biochemical area 4, a heat exchange area 1, a purification tower area 2 and a smoke and air duct component 3;

[0041] The purification tower area 2 is used for flue gas purification; the heat exchange area 1 is used for energy heat exchange; the purification tower area 2 and the heat exchange area 1 are connected through the smoke and air duct assembly 3;

[0042] The biochemical zone 4 includes an anoxic pool 41, an aerobic pool 42 and an MBR membrane pool 43; the three are connected by pipelines; the anoxic pool 41 is connected to the heat exchange zone 1 through a pipeline;

[0043] The biochemical zone 4 and the heat exchange zone 1 are both installed in the box.

[0044] Preferably, the heat exchange area 1 includes an upper header main pipeline 11, a lower header main pipeline 12, a serpentine fin tube 13, an annular fixing plate 14, a steel section 15, a channel steel 16 and a fixing blind plate 17;

[0045] The annular fixing plate 14, several steel sections 15 and the fixing blind plate 17 are installed to the inner wall of the box to form a frame structure, and the serpentine fin tube 13 is installed to the middle of the frame structure through the channel steel 16;

[0046] The pretreated sewage is connected to the upper part of the serpentine fin tube 13 through the upper header main pipeline 11; the lower part of the serpentine fin tube 13 is connected to the anoxic tank 41 of the biochemical area 4 through the lower header main pipeline 12.

[0047] The heat exchange area is a core part of the integrated equipment. It is a space for heat medium exchange, which transfers and exchanges heat between low-temperature cold water and high-temperature flue gas. First, the pretreated sewage flows through the main pipeline of the upper header tank and flows through the serpentine coil. The heat exchanger is installed by two rows of serpentine fin tubes 13 arranged alternately up and down. Circular fins are installed at a certain interval on each serpentine fin tube 13 to increase the heat exchange area. The heat exchanger is connected and fixed by angle steels at both ends. The surrounding area is composed of a frame composed of steel sections 15 to connect the heat exchanger together. The periphery of the box body is fixedly supported by ring plates, steel sections 15 and blind plates, so that the heat exchanger and the box body form a whole and will not shake. No vibration or impact will be generated when sewage enters the heat exchange tube.

[0048] When the fin tubes are connected to the box, the spacing between the fin tubes is fixed. At the same time, the tube box forms a continuous flow channel for the fluid in the tube.

[0049] The cold water becomes hot water after heat exchange and then enters the biochemical reaction area.

[0050] Preferably, the purification tower area 2 comprises a tower body 21, a flue gas inlet 22 is provided at the lower part of the tower body 21, and a flue gas outlet 23 is provided at the top of the tower body 21; the interior of the tower is provided with a spray layer 24, a lower flushing water assembly 25, a baffle 26, an upper flushing water assembly 27, a tube bundle demister 28 and a backwash assembly 29 in sequence from bottom to top;

[0051] A main flue 210 is provided between the backwashing assembly 29 and the flue gas outlet 23 ; the main flue 210 is connected to the heat exchanger through the smoke and air duct assembly 3 .

[0052] Preferably, the smoke and air duct assembly 3 includes a smoke inlet pipe 31 and a smoke outlet pipe 32, the main smoke duct 210 is connected to the lower part of the heat exchange area 1 through the smoke inlet pipe 31, and the upper part of the heat exchange area 1 is connected to the main smoke duct 210 through the smoke storage tank;

[0053] The smoke inlet pipe 31 is provided with a smoke check valve 33 and a smoke regulating valve 34; the smoke outlet pipe 32 is also provided with a smoke check valve 33 and a smoke regulating valve 34; the opening degree can be adjusted to adjust the amount of smoke according to different working conditions. The smoke and air duct assembly 3 forms a smoke circulation system.

[0054] The hot flue gas passes through the flue gas inlet 22, and the gas goes up at a high flow rate; the upward flue gas is forced to mix with the downward spray layer 24 for chemical reaction to remove sulfides, nitrogen oxides and dust in the flue gas; then the flue gas continues to go up through the baffle 26, and the flue gas is divided into many single-stream channels after entering the baffle 26; under the action of inertial force, the droplets collide with the baffle 26 to form a liquid film, and the liquid film moves forward with the air flow to the bend and is separated. The baffle 26 is regularly backwashed by the lower flushing water and the upper flushing water; finally, the flue gas passes through the tube bundle demister 28, and undergoes deep demistering and fine dust in the flue gas. The top of the tube bundle demister 28 is configured with backwashing to regularly clean the dust on the surface of the tube bundle; finally, the clean flue gas is divided into two paths, one is discharged into the atmosphere through the main flue 210, and the other is passed through the main flue 210. The flue gas enters the heat exchanger from top to bottom for heat exchange.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving low-temperature heat exchange sewage treatment equipment, characterized in that: It includes biochemical area, heat exchange area, purification tower area and smoke and air duct components; The purification tower area is used for flue gas purification; the heat exchange area is used for energy heat exchange; the purification tower area and the heat exchange area are connected by a smoke and air duct component; The biochemical zone includes an anoxic pool, an aerobic pool and an MBR membrane pool; the three are connected by pipelines; the anoxic pool is connected to the heat exchange zone through a pipeline; The biochemical area and the heat exchange area are both installed in the box.

2. The energy-saving low-temperature heat exchange sewage treatment equipment according to claim 1 is characterized in that: The heat exchange area includes an upper header main pipeline, a lower header main pipeline, a serpentine fin tube, an annular fixing plate, a steel section, a channel steel and a fixing blind plate; The annular fixing plate, several steel sections and the fixing blind plate are installed on the inner wall of the box to form a frame structure, and the serpentine fin tube is installed to the middle of the frame structure through the channel steel; The pretreated sewage is connected to the upper part of the serpentine fin tube through the main pipeline of the upper header tank; the lower part of the serpentine fin tube is connected to the anoxic tank of the biochemical area through the main pipeline of the lower header tank.

3. The energy-saving low-temperature heat exchange sewage treatment equipment according to claim 2 is characterized in that: The purification tower area includes a tower body, a flue gas inlet is provided at the lower part of the tower body, and a flue gas outlet is provided at the top of the tower body; the interior of the tower is provided with a spray layer, a lower flushing water assembly, a baffle, an upper flushing water assembly, a tube bundle demister and a backwash assembly from bottom to top; A main flue is provided between the backwash component and the flue gas outlet; the main flue is connected with the heat exchanger through the smoke and air duct component.

4. The energy-saving low-temperature heat exchange sewage treatment equipment according to claim 1 is characterized in that: The smoke and air duct assembly includes a smoke inlet pipe and a smoke outlet pipe. The main smoke duct is connected to the lower part of the heat exchange area through the smoke inlet pipe, and the upper part of the heat exchange area is connected to the main smoke duct through the smoke storage tank. The smoke inlet pipe is provided with a smoke check valve and a smoke regulating valve; the smoke outlet pipe is also provided with a smoke check valve and a smoke regulating valve; The smoke and air duct components form a smoke circulation system.

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