Automatic alkali adding device for natural gas desulfurization tower

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to an automatic alkali adding device for a natural gas desulfurization tower, which comprises a control module, an alkali storage tank, the desulfurization tower and a pH sensor, one side of the desulfurization tower is connected with a water storage pond, the water storage pond is connected with a main water pipe through a spraying water pump, and the main water pipe is connected with at least one spraying pipe. Each spraying pipe extends into the desulfurizing tower and is connected with at least one spraying head, the pH sensor is installed on the main water pipe and located between the spraying water pump and the spraying pipes, an alkali adding pipeline is connected between the alkali storage tank and the water storage pond, an alkali liquor water pump is connected to the alkali adding pipeline, and the pH sensor and the alkali liquor water pump are electrically connected with the control module. The installation position of the pH sensor is reasonable in design, and the pH value of the spraying water can be accurately detected in real time, so that the amount of alkali liquor added into the water storage tank is effectively controlled, the stability of the pH value of the spraying water is ensured, and the waste gas purification efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to waste gas treatment technical field, concretely relates to a natural gas desulfurization tower automatic alkali adding device. BACKGROUND

[0002] In the recycling process of lead-acid batteries, a large amount of natural gas needs to be burned, and the burning of natural gas will produce sulfur-containing acidic waste gas. These acidic waste gases are usually introduced into the desulfurization tower by the fan for purification before being discharged. In the desulfurization tower, the spray water becomes alkaline water by adding alkali solution, and the spray water is pressurized by the water pump at the bottom of the tower and sprayed downward from the spray head in the tower. The acidic waste gas moves upward from the bottom of the tower under the action of the fan and fully reacts with the sprayed water, and the acidic waste gas and the alkaline water undergo a neutralization reaction, thereby achieving the effect of purifying the acidic waste gas. The sprayed water after the neutralization reaction flows to the water storage tank at the bottom of the tower for recycling.

[0003] In the prior art, the pH sensor is usually installed on the water storage tank and monitors the pH of the solution inside in real time. The pH sensor is connected to the alkali solution pump through the control module, and the opening and closing of the alkali solution pump is controlled according to the pH value, thereby controlling the amount of alkali added. This technology has certain technical defects in actual application: (1) Because the solution in the water storage tank cannot flow sufficiently, there is a certain difference in the pH values of the solution at different positions in the water storage tank, making it difficult to ensure that the pH value of the spray water lifted to the top of the desulfurization tower remains consistent; (2) The probe of the pH sensor is easily attached with impurities when it is placed in the solution in the water storage tank for a long time, thereby making the measured value of the pH sensor inaccurate, and the amount of alkali added cannot be accurately controlled, affecting the waste gas treatment effect and greatly reducing the purification efficiency of the waste gas. Therefore, it is urgent to optimize the structure of the existing desulfurization tower automatic alkali adding device to provide a natural gas desulfurization tower automatic alkali adding device with more accurate pH detection value and precise alkali addition amount, thereby improving the waste gas purification efficiency and ensuring the waste gas treatment effect. UTILITY MODEL CONTENTS

[0004] The utility model provides a natural gas desulfurization tower automatic alkali adding device according to the deficiencies in the background art, adjusts the installation position of the pH sensor, so that it can not only accurately reflect the pH value of the spray water, but also use the flow of the spray water to flush the probe of the sensor, avoid impurities from adhering to the surface of the probe, effectively improve the accuracy of the detection result, accurately control the amount of alkali added, ensure the waste gas treatment effect, and improve the waste gas purification efficiency.

[0005] To achieve the above-mentioned purposes, the utility model technical solution is as follows:

[0006] The utility model relates to a kind of natural gas desulfurization tower automatic alkali device, it is characterized by: including control module, alkali storage tank, desulfurization tower and pH sensor, the desulfurization tower side is connected with water storage pool, the water storage pool is connected with main water pipe by spraying water pump, at least one spraying pipe is connected on the main water pipe, each spraying pipe extends to desulfurization tower and is connected with at least one shower head, the pH sensor is installed on main water pipe and is located between spraying water pump and spraying pipe, alkali pipeline is connected between the alkali storage tank and water storage pool, alkali pipeline is connected with lye water pump, the pH sensor, lye water pump are electrically connected with control module respectively, the lower end side of desulfurization tower is connected with waste gas inlet pipeline, and its upper end is connected with waste gas outlet pipeline.

[0007] Preferably, the main water pipe is sleeved with a fixed pipe, a detection hole is formed on one side of the fixed pipe, and a matching hole is formed on the main water pipe and matched with the detection hole, the pH sensor passes through the detection hole and the matching hole in sequence, and the probe of the pH sensor is located inside the main water pipe.

[0008] Preferably, a first sealing gasket is arranged at the connection between the pH sensor and the detection hole, and a second sealing gasket is arranged at the connection between the main water pipe and the fixed pipe.

[0009] Preferably, the fixed pipe is assembled and connected by two symmetrical housings which are symmetrically covered on both sides of the fixed pipe through bolts.

[0010] Preferably, the main water pipe is vertically arranged along the height direction of the desulfurization tower, and the spraying pipe is horizontally arranged along the length direction of the desulfurization tower.

[0011] Preferably, a waste liquid discharge pipeline is connected to the bottom of the desulfurization tower, and a liquid discharge valve is arranged on the waste liquid discharge pipeline.

[0012] Preferably, at least one observation port is arranged on the desulfurization tower.

[0013] Preferably, a clean water inlet pipeline is connected to the water storage pool, and a water inlet valve is arranged on the clean water inlet pipeline.

[0014] Preferably, the waste gas inlet pipeline is connected with a waste gas collection pipeline through a fan.

[0015] Preferably, a stirring motor is arranged on the alkali storage tank, and a stirring paddle is connected to the lower end of the stirring motor.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] (1) The utility model discloses a pH sensor is installed on the main water pipe connected with the spray pipe, can accurately detect the pH value of the spray water, and the alkali solution adding amount is accurately controlled, guarantees the waste gas treatment effect, improves the waste gas purification efficiency, and the probe surface is washed by the flowing spray water simultaneously, avoids the attachment of impurity, improves the sensitivity of pH sensor probe, guarantees the accuracy of detection value.

[0018] (2) The utility model discloses connecting the clean water inlet pipeline on the water storage pool, and the clean water inlet pipeline can introduce the clean water into the water storage pool, and transports to the main water pipe, the spray pipe under the action of the spray water pump, not only can further wash the impurity on the sensor probe, improves the accuracy of measurement, but also can make the clean water clean the inside of desulfurizing tower through the spray head. BRIEF DESCRIPTION OF DRAWINGS

[0019] Other features, objects and advantages of the utility model will become more apparent through reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0020] Figure 1 It is the structure schematic drawing of the utility model;

[0021] Figure 2 It is the structure schematic drawing of the utility model pH sensor and main water pipe connection;

[0022] Figure 3 It is the sectional structure schematic drawing of the utility model Figure 2 ;

[0023] In the drawing: 1, desulfurizing tower, 2, water storage pool, 3, waste gas inlet pipeline, 4, main water pipe, 5, spray water pump, 6, spray pipe, 7, pH sensor, 701, sensor probe, 8, first sealing gasket, 9, control module, 10, clean water inlet pipeline, 1001, inlet valve, 11, alkali solution water pump, 12, stirring motor, 13, stirring paddle, 14, waste liquid discharge pipeline, 1401, liquid discharge valve, 15, observation port, 16, spray head, 17, fan, 18, waste gas collection pipeline, 19, waste gas outlet pipeline, 20, fixed pipe, 21, second sealing gasket, 22, alkali adding pipeline, 23, alkali storage tank. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] In the description of this utility model, it should be understood that the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "setting," "installing," "connecting," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] like Figure 1 As shown, an automatic alkali addition device for a natural gas desulfurization tower includes a control module 9 and a desulfurization tower 1. A water storage tank 2 is connected to one side of the bottom of the desulfurization tower, and the bottom of the desulfurization tower is connected to the water storage tank. An alkali addition pipe 22 and a spray water pump 5 are connected to the water storage tank. The inlet of the spray water pump is connected to the water storage tank, and the outlet of the spray water pump is connected to the main water pipe 4. At least one spray pipe 6 is connected to the main water pipe. Each spray pipe extends into the desulfurization tower, and each spray pipe is connected to at least one spray head 16. The spray water pump can sequentially deliver the spray water from the water storage tank through the main water pipe and the spray pipe to each spray head, thereby spraying the waste gas in the desulfurization tower to perform a neutralization reaction. In this embodiment, two spray pipes 6 are provided, and the two spray pipes are distributed vertically and horizontally. A pH sensor 7 is connected to the main water pipe. The pH sensor is installed on the main water pipe and located between the spray water pump and the spray pipe. The pH sensor can detect the pH value of the spray water flowing through the main water pipe in real time. An alkali storage tank (23) is located on one side of the water storage tank. An alkali solution pump (11) is connected to the storage tank. The outlet of the alkali solution pump is connected to the water storage tank (23) via an alkali addition pipe (22). A pH sensor and the alkali solution pump are electrically connected to the control module. The pH sensor feeds real-time pH data back to the control module. When the pH value is lower than the set value, the control module sends a command to start the alkali solution pump, transporting the alkali solution from the storage tank to the water storage tank to adjust the pH value of the spray water in the water storage tank. When the pH value reaches the set value, the alkali solution pump stops working. In this embodiment, the control module is a PLC controller, which will not be described in detail here. To facilitate the operator's preparation of liquid alkali, a stirring motor (12) is connected to the storage tank, and a stirring paddle (13) is connected to the lower end of the stirring motor for thorough internal stirring.

[0028] The waste gas inlet pipeline 3 is connected to one side of the lower end of the desulfurization tower, and the waste gas outlet pipeline 19 is connected to the upper end of the desulfurization tower, the waste gas inlet pipeline is connected with the waste gas collection pipeline 18 through the fan 17, the waste gas collection pipeline collects the waste gas generated by the combustion of natural gas, and under the action of the fan, the waste gas can move upwards to contact the spraying water sprayed downwards to perform a sufficient chemical reaction, and the treated gas is discharged from the waste gas outlet pipeline. The main water pipe is vertically arranged along the height direction of the desulfurization tower, so that the spraying water can be conveniently conveyed from the bottom end of the desulfurization tower to the spraying pipe, the spraying pipe is horizontally arranged along the length direction of the desulfurization tower, so that the spraying head on the spraying pipe can be conveniently horizontally sprayed downwards. The desulfurization tower is connected with the waste liquid discharge pipeline 14 at the bottom, the waste liquid discharge pipeline is provided with the liquid discharge valve 1401, after the desulfurization tower is operated for a period of time, the desulfurization tower needs to be cleaned and maintained, at this time, the waste liquid in the desulfurization tower can be discharged through the opening of the liquid discharge valve to facilitate the cleaning and maintenance. At least one observation port 15 is arranged on one side of the desulfurization tower, and an operator can observe the spraying condition in the desulfurization tower in real time through the observation port.

[0029] As Figure 1 shown, in order to facilitate the regular cleaning and maintenance of the desulfurization tower, the water storage pool is connected with the clean water inlet pipeline 10, the clean water inlet pipeline is provided with the water inlet valve 1001, long-term acid-base neutralization reaction can generate dirt in the desulfurization tower, at this time, the clean water can enter the water storage pool through the opening of the water inlet valve, the closing of the fan and the alkali liquid pump, and the spraying of the clean water to the desulfurization tower through the main water pipe and the spraying pipe under the action of the spraying water pump, so that the inside of the desulfurization tower is cleaned circularly, after the cleaning is completed, the waste water is discharged through the opening of the liquid discharge valve, so that the inside of the desulfurization tower is cleaned.

[0030] As Figure 2 and Figure 3 shown, the main water pipe is sleeved with the fixed pipe 20 provided with the detection hole in the side surface, the fixed pipe is connected by the bolt assembly of the two symmetrical housings covered on both sides of the fixed pipe, so that the fixed pipe is convenient to disassemble and assemble and is convenient to regularly maintain and maintain. The main water pipe is provided with the matching hole matched with the detection hole, the pH sensor includes the sensor probe 701, the sensor passes through the detection hole and the matching hole in sequence, so that the probe is arranged in the main water pipe. The sensor probe arranged in the main water pipe can more accurately measure the pH value in the main water pipe, the spraying water in the main water pipe is always in a flowing state under the action of the spraying water pump, so that the sensor probe is washed, and the problem that the sensor measurement is inaccurate due to dirt adhesion on the sensor probe is avoided. The connection position of the pH sensor and the detection hole is provided with the first sealing gasket 8, the first sealing gasket is located between the outer wall of the sensor and the inner wall of the detection hole, the connection position of the main water pipe and the fixed pipe is provided with the second sealing gasket 21, the second sealing gasket is located between the outer wall of the main water pipe and the inner wall of the fixed pipe, and the second sealing gasket plays a sealing role.

[0031] The working principle of the utility model is as follows:

[0032] As Figures 1 to 3 shown, the exhaust gas generated in natural gas combustion is under the action of the fan 17, sequentially through the exhaust gas collecting pipeline 18, the exhaust gas inlet pipeline 3 into the desulfurization tower and moves upward, at the same time, under the action of the spray water pump 5, the spray water is from the water storage pool 2, sequentially through the main water pipe 4, the spray pipe 6, the spray nozzle 16 into the desulfurization tower, the downward moving spray water and the upward moving exhaust gas fully contact, since the exhaust gas is acidic exhaust gas, the spray water is alkaline water, the two neutralize to achieve the effect of purifying the exhaust gas, the treated gas is discharged from the exhaust gas outlet pipeline at the upper end of the desulfurization tower. Since the pH sensor 7 is installed on the main water pipe and located between the spray water pump and the spray pipe, the pH value of the spray water in the main water pipe is detected in real time, when it is lower than the set value, the control module 9 sends a command to start the alkali water pump 11 to transport the alkali liquid in the alkali storage tank 23 to the water storage pool 2 to adjust the pH value of the spray water in the water storage pool; when the pH value reaches the set value, the alkali water pump 11 stops working, thereby achieving the purpose of automatic alkali addition.

[0033] In addition, when the inside of the desulfurization tower is cleaned by circulating clean water, the following steps are included:

[0034] (1) input clean water: refer to the description in the accompanying drawings Figure 1 As shown, after opening the water inlet valve 1001 on the clean water inlet pipeline 10, the clean water enters the water storage pool 2 from the clean water inlet pipeline 10, under the action of the spray pump 5, the clean water in the water storage pool 2 is transported, sequentially through the main water pipe 4, the spray pipe 6, and then sprayed out by the spray head 16 to preliminarily spray and clean the inside of the desulfurization tower 1;

[0035] (2) circulating spray: the clean water after preliminary spray and cleaning is collected at the bottom of the desulfurization tower 1, at this time, the liquid discharge valve 1401 of the waste liquid discharge pipeline 14 is in the closed state, the clean water after preliminary spray and cleaning enters the water storage pool 2, under the action of the spray water pump 5, the inside of the desulfurization tower is sprayed and cleaned again, thereby realizing the circulating cleaning;

[0036] (3) discharge waste water: after the inside of the desulfurization tower is cleaned, the liquid discharge valve 1401 on the waste liquid discharge pipeline 14 is opened, the cleaned water is discharged through the waste liquid discharge pipeline 14, and the circulating cleaning of the inside of the desulfurization tower is completed.

[0037] In the process of transporting the clean water from the main water pipe to the spray pipe by the spray water pump 5, the pH sensor 7 is washed to achieve the purpose of cleaning impurities and improve the accuracy of measurement.

[0038] The basic principle and main features of the present application and the advantages of the present application are shown and described above, for those skilled in the art, obviously the present application is not limited to the details of the above exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the present application. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A natural gas desulfurization tower automatic alkali feeding device, characterized in that: Including control module, the alkali tank, the desulfurizing tower and the pH sensor, one side of the desulfurizing tower is connected with the water storage tank, the water storage tank is connected with the main water pipe through the spray water pump, at least one spray pipe is connected on the main water pipe, each spray pipe extends into the desulfurizing tower and is connected with at least one spray head, the pH sensor is installed on the main water pipe and is located between the spray water pump and the spray pipe, the alkali tank and the water storage tank are connected with the alkali adding pipeline, the alkali adding pipeline is connected with the lye water pump, the pH sensor and the lye water pump are electrically connected with the control module respectively, one side of the lower end of the desulfurizing tower is connected with the waste gas inlet pipeline, and the upper end is connected with the waste gas outlet pipeline.

2. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: The fixed pipe is sleeved on the main water pipe, a detection hole is formed in one side of the fixed pipe, a matching hole is formed in the main water pipe, the pH sensor passes through the detection hole and the matching hole in sequence, and the probe of the pH sensor is located in the main water pipe.

3. The automatic alkali feeding device for natural gas desulfurization tower according to claim 2, characterized in that: First sealing gaskets are arranged at the connecting positions of the pH sensor and the detection hole, and second sealing gaskets are arranged at the connecting positions of the main water pipe and the fixed pipe.

4. The automatic alkali feeding device for natural gas desulfurization tower according to claim 2 or 3, characterized in that: The fixed pipe is assembled and connected by two symmetrical housings which are symmetrically covered on both sides of the fixed pipe through bolts.

5. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: The main water pipe is vertically arranged along the height direction of the desulfurizing tower, and the spray pipe is horizontally arranged along the length direction of the desulfurizing tower.

6. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: The desulfurizing tower is connected with a waste liquid discharge pipeline, and the waste liquid discharge pipeline is provided with a liquid discharge valve.

7. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: At least one observation port is arranged on the desulfurizing tower.

8. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: A clean water inlet pipeline is connected to the water storage tank, and the clean water inlet pipeline is provided with a water inlet valve.

9. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: The waste gas inlet pipeline is connected with a waste gas collecting pipeline through a fan.

10. The automatic alkali feeding device for natural gas desulfurization tower according to claim 1, characterized in that: A stirring motor is arranged on the alkali tank, and a stirring paddle is connected to the lower end of the stirring motor.

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