An immersed combustion evaporator with automatic defoaming agent adding system

Abstract

The utility model discloses an immersion combustion evaporator with automatic defoaming agent adding system relates to defoaming agent adding technical field. It includes a plurality of evaporators, and the evaporator import is connected with the feed pipeline, and the evaporator import is connected with the feed pipeline between having defoamer adding pipeline, still include with the feed pipeline, defoamer adding pipeline connection for controlling the PLC control cabinet of defoamer adding amount. The utility model provides an immersion combustion evaporator with automatic defoaming agent adding system, and it can realize the accurate adding of defoaming agent automatically, thereby guaranteeing the water quality, relieving the steam space scale blockage.

Description

Technical Field

[0001] This utility model relates to the field of defoamer dosing technology, and in particular to an immersion combustion evaporator with an automatic defoamer dosing system. Background Technology

[0002] The landfill leachate treatment industry uses membrane treatment systems for deep treatment of leachate to achieve stable effluent quality. However, membrane treatment systems face the challenge of treating the concentrated leachate. To address this, a submerged combustion evaporation technology, described in Chinese invention patent CN111870978A, is employed to treat the concentrated leachate, effectively achieving full treatment of the leachate. The core unit of this technology is the evaporator, which mainly consists of a combustion chamber, feed pipe, gas-liquid heat exchange zone, sludge collection tank, and steam space, resulting in a simple structure. The concentrated leachate is fed into the evaporator via a screw pump through the feed pipe. Gas and air are rapidly mixed and fully combusted in the combustion chamber, generating high-temperature flue gas which is blown into the evaporator for direct contact with the concentrated leachate for heat exchange and evaporation. Water and volatile substances in the concentrated leachate are discharged as steam or non-condensable gases through the upper steam space. Residual non-volatile substances and salts enter the sludge collection tank under gravity, achieving concentration and crystallization. The feed screw pump is interlocked with the liquid level in the evaporator. It automatically adjusts the feed flow rate according to the liquid level changes. When the liquid level in the evaporator reaches the set value, the feed pump is automatically stopped; when the liquid level is lower than the set value, it is automatically turned on, so that evaporation and feeding can be carried out continuously, ensuring the stable operation of the evaporator and improving production capacity.

[0003] In the submerged combustion evaporator, high-temperature gas (800℃-1000℃) is blown into the evaporator and directly contacts the concentrate for heat exchange in the form of microbubbles. Due to the complex composition of the raw liquid, which contains easily foaming large organic molecules, these foaming substances, under the influence of high temperature and gas disturbance, adsorb their hydrophilic and hydrophobic groups onto both the liquid and gas phases, respectively. This easily forms a stable elastic film at the interface between the two phases, resulting in a large number of bubbles. The aggregation of these bubbles rapidly generates foam.

[0004] The presence of these foams within the evaporator causes significant fluctuations in the liquid level, affecting system stability. Furthermore, if the foam is not eliminated, it can contaminate the effluent water quality through steam entrainment, carrying salt particles and clogging the steam space and separation tower. Therefore, it is essential to add a high-temperature resistant, silicone-containing defoamer to the evaporator feed liquid to reduce foam generation, ensuring the safe operation of the evaporation system and stable, compliant effluent water quality.

[0005] However, current submerged combustion evaporators used for landfill leachate treatment typically employ a single variable frequency centrifugal pump to inject a defoamer mixture into the evaporator's main feed pipe. The mixture is then distributed from the main pipe to individual evaporator feed branches, where it is fed into each evaporator via screw feed pumps. The defoamer dosage can only be adjusted manually by regulating the pump frequency. Over long-term operation, this can lead to uneven defoamer dosage across the evaporators, with higher dosages closer to the main pipe and lower dosages further away. This results in inconsistent defoaming effects, causing variations in permeable water quality and scaling in the evaporation space. Other dosing methods, such as using diaphragm metering pumps, suffer from higher initial investment costs and more complex maintenance in the long run. Utility Model Content

[0006] The purpose of this invention is to provide a submerged combustion evaporator with an automatic defoamer dosing system, which can achieve automatic and precise dosing of defoamer, thereby ensuring the quality of the effluent and alleviating scaling and clogging in the steam space.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is: an immersion combustion evaporator with an automatic defoamer dosing system, comprising multiple evaporators, wherein the inlet of each evaporator is connected to a feed pipe, and a defoamer dosing pipe is connected between the inlet of each evaporator and the feed pipe; and further comprising a PLC control cabinet connected to the feed pipe and the defoamer dosing pipe for controlling the amount of defoamer added.

[0008] As a further improvement of this utility model, the feed pipeline includes a main feed pipe, one end of which is connected to the raw liquid tank, and the other end is connected to multiple evaporators one by one through multiple feed branch pipes. A screw feed pump, a feed control valve and a feed flow meter are sequentially provided on the feed branch pipes along the feeding direction. The defoamer dosing pipeline includes a defoamer dosing main pipe connected to the dosing tank at both ends. The defoamer dosing main pipe is equipped with a defoamer circulation pump and multiple defoamer dosing branch pipes in sequence along the feeding direction. The output ends of the multiple defoamer dosing branch pipes are respectively connected to the pipe bodies of multiple feed branch pipes located between the screw feed pump and the feed control valve. The defoamer dosing branch pipes are equipped with a check valve and an electromagnetic flow control valve in sequence along the feeding direction. The feed flow meter on each feed branch pipe is electrically connected to the electromagnetic flow control valve on the corresponding defoamer dosing branch pipe via a PLC control cabinet.

[0009] As a further improvement of this utility model, each of the evaporators is equipped with a level gauge, and the level gauges in each evaporator are electrically connected to the screw feed pump on the corresponding feed branch pipe through a PLC control cabinet.

[0010] As a further improvement of this utility model, a pressure indicator is provided on the defoamer dosing pipe, and the pressure indicator is electrically connected to the defoamer circulation pump through a PLC control cabinet.

[0011] As a further improvement of this utility model, a pressure regulating valve is also provided on the defoamer dosing pipe.

[0012] As a further improvement of this utility model, the dosing tank is equipped with a stirrer.

[0013] As a further improvement of this utility model, the dosing tank is connected to a water inlet pipe and a drain pipe, and the drain pipe is equipped with a drain valve. Beneficial effects

[0014] Compared with the prior art, the advantages of the submerged combustion evaporator with an automatic defoamer dosing system of this utility model are as follows: 1. This device, controlled by a PLC control cabinet, can control the addition of defoamer to each evaporator via the defoamer dosing pipeline. It can also adjust the dosing flow rate in real time based on the feed flow rate, thus achieving automatic and precise control of defoamer dosing and ensuring balanced dosing in each evaporator. Simultaneously, by effectively controlling the amount of defoamer added, the device can stably remove foam from the evaporator, preventing the foam from carrying organic matter and salts, thereby ensuring safe and stable effluent quality and effectively mitigating scaling problems in the steam space.

[0015] The present invention will become clearer from the following description and in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] The components are as follows: 1-Soil solution tank; 2-Screw feed pump; 3-Feed control valve; 4-Feed flow meter; 5-Evaporator; 6-Level gauge; 7-Dosing tank; 8-Defoamer circulation pump; 9-Pressure indicator; 10-Pressure stabilizing valve; 11-Agitator; 12-Drain valve; 13-Check valve; 14-Electromagnetic flow control valve; 15-PLC control cabinet; 16-Main feed pipe; 17-Feed branch pipe; 18-Defoamer dosing main pipe; 19-Defoamer dosing branch pipe. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; of course, they can also refer to a mechanical connection or an electrical connection; furthermore, they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Embodiments of the present invention will now be described with reference to the accompanying drawings. Example

[0022] The specific embodiments of this utility model are as follows: Figure 1 As shown, a submerged combustion evaporator with an automatic defoamer dosing system includes multiple evaporators 5, with the inlet of each evaporator 5 connected to a feed pipeline. A defoamer dosing pipeline is connected between the inlet of each evaporator 5 and the feed pipeline. The device also includes a PLC control cabinet 15 connected to the feed pipeline and the defoamer dosing pipeline for controlling the amount of defoamer added.

[0023] The PLC control cabinet 15 controls the addition of defoamer to each evaporator 5 via the defoamer dosing pipeline, and can adjust the dosing flow rate in real time according to the feed flow rate of the feed pipeline, thereby achieving automatic and precise control of defoamer dosing and ensuring balanced defoamer dosing in each evaporator. Simultaneously, this device effectively controls the amount of defoamer added, achieving stable foam removal within the evaporator 5, preventing the foam from carrying organic matter, salts, etc., thus ensuring safe and stable effluent quality and effectively mitigating scaling problems in the steam space. Therefore, this device can avoid potential environmental and equipment safety risks, and in particular, effectively ensure that the water quality meets discharge standards and the normal operation of the evaporator 5 under long-term operation, thereby reducing initial investment costs and subsequent maintenance costs.

[0024] Regarding the specific structure of the feed pipeline: The feed pipeline includes a main feed pipe 16, one end of which is connected to the raw liquid tank 1, and the other end is connected to multiple evaporators 5 one by one through multiple feed branch pipes 17. Along the feeding direction, the feed branch pipes 17 are equipped with a screw feed pump 2, a feed control valve 3, and a feed flow meter 4.

[0025] In use, the concentrate in the raw liquid tank 1 enters the corresponding evaporator 5 through the feed main pipe 16. During this process, the screw feed pump 2 applies force to push the concentrate into the corresponding evaporator 5 through the feed branch pipe 17, and the feed flow meter 4 measures the instantaneous feed flow rate and the cumulative feed flow rate.

[0026] Regarding the specific structure of the defoamer dosing pipeline: The defoamer dosing pipeline includes a main defoamer dosing pipe 18 connected to the dosing tank 7 at both ends. Along the feeding direction, the main defoamer dosing pipe 18 is sequentially equipped with a defoamer circulation pump 8, multiple defoamer dosing branch pipes 19, a pressure indicator 9, and a pressure regulating valve 10. The output ends of the multiple defoamer dosing branch pipes 19 are respectively connected to the pipe bodies of multiple feed branch pipes 17 located between the screw feed pump 2 and the feed control valve 3. A one-way valve 13 and an electromagnetic flow control valve 14 are sequentially installed along the feeding direction on each defoamer dosing branch pipe 19. In this embodiment, the feed flow meter 4 on each feed branch pipe 17 is electrically connected to the electromagnetic flow control valve 14 on the corresponding defoamer dosing branch pipe 19 via a PLC control cabinet 15.

[0027] In use, the defoamer dosing main pipe 18 adds defoamer to the feed branch pipes 17 of each evaporator 5 through the defoamer dosing branch pipes 19. During this process, the one-way valve 13 on the defoamer dosing branch pipe 19 allows the mixture of raw liquid and defoamer to flow back; the electromagnetic flow control valve 14 regulates the defoamer feed flow rate. Specifically: the defoamer dosing flow rate is controlled by the PLC control cabinet 15—the feed flow meter 4 sets a threshold. When the feed flow rate is higher than the set value, the flow signal is converted into an electrical signal and transmitted to the PLC control cabinet 15, and the system automatically increases the opening of the electromagnetic flow control valve 14, increasing the defoamer dosing flow rate; when the feed flow rate is lower than the set value, the flow signal is converted into an electrical signal and transmitted to the PLC control cabinet 15, and the system automatically decreases the opening of the electromagnetic flow control valve 14, decreasing the defoamer dosing flow rate.

[0028] Therefore, the device can monitor the instantaneous flow rate changes of the feed branch pipe 17 through the feed flow meter 4. When the flow rate signal changes, the signal is transmitted to the PLC control cabinet 15. The PLC control cabinet 15 automatically adjusts the opening of the electromagnetic flow control valve 14 according to the change, thereby maintaining the ratio of defoamer dosage to raw liquid feed amount as a constant value, thus realizing automatic and precise control of defoamer dosage.

[0029] Meanwhile, each evaporator 5 in the device is equipped with a level gauge 6, and each level gauge 6 in each evaporator 5 is electrically connected to the screw feed pump 2 on the corresponding feed branch pipe 17 via the PLC control cabinet 15. When the liquid level reaches the high set value, the level gauge 6 converts the liquid level signal into a current signal and transmits it to the PLC control cabinet 15. Upon receiving the signal, the PLC control cabinet 15 automatically stops the screw feed pump 2. As the evaporation process proceeds, the liquid level gradually decreases. When the liquid level reaches the low set value, the level gauge 6 again converts the liquid level signal into a current signal and transmits it to the PLC control cabinet 15. Upon receiving the signal, the PLC control cabinet 15 automatically starts the screw feed pump 2. Thus, the stamping paper can maintain the liquid level in the evaporator 5 within the set value range.

[0030] Furthermore, the pressure indicator 9 of this device is electrically connected to the defoamer circulation pump 8 via the PLC control cabinet 15. The PLC control cabinet 15 maintains a stable pressure within the defoamer dosing main pipe 18—when the main pipe pressure changes, the pressure indicator 9 converts the pressure signal into a current signal and transmits it to the PLC control cabinet 15. Upon receiving the signal, the PLC control cabinet 15 automatically adjusts the operating frequency of the defoamer circulation pump 8, thereby maintaining the pressure of the defoamer dosing main pipe 18 within the set value range.

[0031] In addition, the dosing tank 7 in this embodiment is equipped with a stirrer 11, and the dosing tank 7 is also connected to a water inlet pipe and a drain pipe. The water inlet pipe is connected to the plant's water supply network, and the drain pipe is equipped with a drain valve 12.

[0032] During use, the defoamer in a drum is added to the dosing tank 7, and clean water is added through the water inlet pipe to mix the defoamer. The agitator 11 is then used to mix the agent evenly. Additionally, if necessary, the agent in the drum can be emptied through the drain valve 12.

[0033] The present invention has been described above in conjunction with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations made in accordance with the essence of the present invention.

Claims

1. A submerged combustion evaporator with an automatic defoamer dosing system, comprising multiple evaporators (5), wherein the inlet of each evaporator (5) is connected to a feed pipeline, characterized in that, The evaporator (5) is connected to the feed pipe via a defoamer dosing pipe; it also includes a PLC control cabinet (15) connected to the feed pipe and the defoamer dosing pipe for controlling the amount of defoamer added.

2. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 1, characterized in that, The feed pipeline includes a main feed pipe (16), one end of which is connected to the raw liquid tank (1), and the other end is connected to multiple evaporators (5) one by one through multiple feed branch pipes (17). The feed branch pipes (17) are provided with a screw feed pump (2), a feed control valve (3) and a feed flow meter (4) in sequence along the feeding direction. The defoamer dosing pipeline includes a defoamer dosing main pipe (18) connected to the dosing tank (7) at both ends. The defoamer dosing main pipe (18) is provided with a defoamer circulation pump (8) and multiple defoamer dosing branch pipes (19) in sequence along the feeding direction. The output ends of the multiple defoamer dosing branch pipes (19) are respectively connected to the pipe bodies of the multiple feed branch pipes (17) located between the screw feed pump (2) and the feed control valve (3). A one-way valve (13) and an electromagnetic flow control valve (14) are provided in sequence along the feeding direction on the defoamer dosing branch pipes (19). The feed flow meter (4) on each feed branch pipe (17) is electrically connected to the electromagnetic flow control valve (14) on the corresponding defoamer dosing branch pipe (19) through the PLC control cabinet (15).

3. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 2, characterized in that, Each of the evaporators (5) is equipped with a level gauge (6), and the level gauge (6) in each of the evaporators (5) is electrically connected to the screw feed pump (2) on the corresponding feed branch pipe (17) through the PLC control cabinet (15).

4. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 2, characterized in that, The defoamer dosing pipe (18) is equipped with a pressure indicator (9), which is electrically connected to the defoamer circulation pump (8) through the PLC control cabinet (15).

5. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 2 or 4, characterized in that, The defoamer dosing pipe (18) is also equipped with a pressure regulating valve (10).

6. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 2, characterized in that, The dosing tank (7) is equipped with a stirrer (11).

7. The submerged combustion evaporator with an automatic defoamer dosing system according to claim 2, characterized in that, The dosing tank (7) is connected to a water inlet pipe and a drain pipe, and the drain pipe is equipped with a drain valve (12).

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