A multi-amine film-forming dosing device for a waste heat boiler

Abstract

The utility model belongs to the technical field of waste heat boiler dosing device, relate to a waste heat boiler polyamine film forming dosing device, including dosing jar, dosing jar top is equipped with the dosing opening of reagent and desalted water inlet, bottom is equipped with the dosing opening, be provided with the stirrer in dosing jar, dosing jar side wall is provided with heating component, stirrer and heating component electric connection are connected to control assembly, dosing jar top connects desalted water pipeline, and desalted water pipeline is connected with dosing jar top and is provided with water inlet valve in connecting place, dosing jar bottom is connected to the collecting pipeline, and the stop valve is provided on the collecting pipeline, and the dosing pipeline is led out on the collecting pipeline and is connected to the water supply pipeline, and the dosing pump is provided on the dosing pipeline, and the dosing valve is provided at the front end of dosing pump, and the water supply pipeline is connected to the boiler. The utility model has the functions of dispensing, heating, stirring, homogenizing, metering and injection, and solid or liquid polyamine reagent and desalted water are mixed into uniform solution in the jar, and are injected into the boiler water supply pipeline.

Description

Technical Field

[0001] This utility model belongs to the technical field of waste heat boiler dosing devices, specifically relating to a waste heat boiler polyamine film-forming dosing device. Background Technology

[0002] Waste heat boilers are devices used to recover waste heat energy from industrial processes. They consist of a boiler drum, movable fume hood, flue gas duct at the furnace inlet, inclined flue gas duct section 1, inclined flue gas duct section 2, final flue gas duct section 1, final flue gas duct section 2, feed pipe trough, oxygen lance inlet, nitrogen sealing device and nitrogen sealing plug, manhole, differential pressure tapping device, flue gas supports and hangers, etc. For boiler water quality conditioning, phosphate treatment is used. Phosphate is added to complex calcium and magnesium ions in the water to prevent scaling.

[0003] However, phosphates are inorganic salts, and continuous addition increases the total dissolved solids content in the boiler water, leading to higher conductivity. To avoid steam-water eutrophication due to excessive salt concentration and to prevent accelerated corrosion, the boiler must undergo frequent and large-scale blowdowns, resulting in waste of water resources and thermal energy, which contradicts current environmental protection requirements for energy conservation and emission reduction. Ammonia is the most widely used alkaline agent for adjusting the pH value of boiler water systems. While ammonia effectively raises the pH value and inhibits acid corrosion, it has a strong volatility and pungent odor, posing risks of leakage and inhalation during dosing, storage, and operation, thus threatening the health and safety of on-site operators. Furthermore, ammonia exhibits selective corrosion of common metals such as copper and copper alloys, exacerbating the corrosion risk in the presence of dissolved oxygen.

[0004] In summary, existing dosing schemes based on "phosphate and ammonia water" have problems such as large sewage discharge, high operating costs, safety hazards, and corrosion risks. Therefore, a polyamine film-forming dosing device for waste heat boilers is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a polyamine film-forming dosing device for waste heat boilers, which features automation, precision, and high safety. It solves the problems in the prior art, such as large boiler blowdown and uneconomical operation due to the use of phosphates, as well as the operational safety risks and equipment corrosion hazards caused by the use of ammonia.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a polyamine film-forming dosing device for waste heat boilers, including a dosing tank. The top of the dosing tank is provided with a dosing port and a demineralized water inlet, and the bottom is provided with a dosing outlet. A stirrer is installed inside the dosing tank, and a heating element is installed on the side wall of the dosing tank. The stirrer and the heating element are electrically connected to a control component. The top of the dosing tank is connected to a demineralized water pipe, and an inlet valve is installed at the connection between the demineralized water pipe and the top of the dosing tank. The bottom of the dosing tank is connected to a collection pipe through a connecting pipe, and a connecting valve is installed on the connecting pipe. A shut-off valve is installed on the collection pipe, and a dosing pipe is led out from the collection pipe and connected to a water supply pipe. A dosing pump is installed on the dosing pipe, and a dosing valve is installed at the front end of the dosing pump. The water supply pipe is connected to the boiler.

[0007] Preferably, the control component includes a PLC and is equipped with a human-machine interface.

[0008] Preferably, the heating element is an electric heating wire wound around the outer wall of the dosing tank, and a temperature sensor is installed inside the dosing tank. The control component is electrically connected to the electric heating wire and the temperature sensor.

[0009] Preferably, the dosing tank is equipped with a level gauge, and the inlet valve on the demineralized water pipeline is a solenoid valve. The level gauge and the inlet valve are electrically connected to the control component.

[0010] Preferably, the dosing pipeline is equipped with a Y-type filter at the inlet of the dosing pump and a check valve at the outlet of the dosing pump.

[0011] Preferably, the end of the collecting pipe is connected to a sewage pipe, and a sewage valve is installed on the sewage pipe.

[0012] Preferably, the dosing pump is a mechanical diaphragm metering pump, and the dosing pump is electrically connected to the control component.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. This utility model has functions of drug preparation, heating to promote dissolution, stirring to homogenize, metering and injection. It mixes solid or liquid polyamine agents with demineralized water in a tank to form a uniform solution and injects it into the boiler feedwater pipeline.

[0015] 2. This utility model features automation, precision, and high safety, solving problems in the prior art such as large boiler blowdown and uneconomical operation due to the use of phosphates, as well as operational safety risks and equipment corrosion hazards caused by the use of ammonia. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are 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 a waste heat boiler polyamine film-forming dosing device according to one embodiment;

[0018] In the diagram above, 1. Dosing tank, 2. Agitator, 3. Heating component, 4. Demineralized water pipeline, 5. Inlet valve, 6. Connecting valve, 7. Manifold, 8. Shut-off valve, 9. Dosing pump, 10. Dosing valve, 11. Water supply pipeline, 12. Boiler, 13. Control components, 14. Y-type filter, 15. Check valve, 16. Sewage pipeline, 17. Sewage valve, 18. Level gauge, 19. Temperature sensor. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0020] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0021] Example 1, as Figure 1 As shown, a polyamine film-forming dosing device for a waste heat boiler includes a dosing tank 1. The dosing tank 1 has a reagent inlet and a demineralized water inlet at the top, and a reagent outlet at the bottom. The dosing tank 1 is used to dissolve, dilute, heat, and temporarily store the polyamine film-forming agent, replacing the traditional dosing process that requires multiple containers and complex operations. In addition to the existing reagent inlet and demineralized water inlet, the top also has a vent to prevent negative pressure during liquid extraction. The bottom reagent outlet is designed with a concave or sloping bottom to avoid the accumulation of stagnant liquid.

[0022] The dosing tank 1 is equipped with a stirrer 2, which is driven by a motor to rotate the blades, ensuring rapid and thorough mixing of the added polyamine agent with the demineralized water to form a homogeneous solution. During heating, the stirrer also promotes heat transfer, preventing localized overheating or precipitation of the agent. The blade type can be anchor-type, paddle-type, or propeller-type, depending on the tank size, to agitate the bottom area of ​​the tank. A heating element 3 is installed on the side wall of the dosing tank 1 to heat the solution, improving the solubility and chemical activity of the polyamine agent.

[0023] The stirrer 2 and heating element 3 are electrically connected to the control component 13. A demineralized water pipe 4 is connected to the top of the dosing tank 1. An inlet valve 5 is installed at the connection between the demineralized water pipe 4 and the top of the dosing tank 1. The demineralized water pipe 4 is responsible for supplying the solvent required for solution preparation to the dosing tank 1. The inlet valve 5 automatically replenishes water, using demineralized water to avoid introducing new impurity ions. Automatic water replenishment is achieved in conjunction with the level gauge 18 and the control component 13, requiring no manual intervention. A pressure gauge and a manual bypass valve can be added to the pipe after the inlet valve 5 for easy debugging and maintenance.

[0024] The bottom of the dosing tank 1 is connected to the collection pipe 7 via a connecting pipe. A connecting valve 6 is installed on the connecting pipe, and a shut-off valve 8 is installed on the collection pipe 7. The connecting valve 6 is used to disconnect the tank from the system when the dosing tank 1 needs to be isolated for maintenance. The collection pipe 7 is the main channel for the outflow of the chemical solution, and the shut-off valve 8 serves as a second isolation valve, providing isolation protection. The collection pipe 7 has a certain inclination, sloping towards the drain outlet to facilitate the emptying of accumulated liquid.

[0025] A dosing pipeline extends from the collecting pipeline 7 and connects to the feedwater pipeline 11. A dosing pump 9 is installed on the dosing pipeline, and a dosing valve 10 is located at the front end of the dosing pump 9. The feedwater pipeline 11 connects to the boiler 12. The dosing pump 9 accurately, stably, and continuously injects the prepared chemical solution into the feedwater pipeline 11 of the boiler 12, matching the operating conditions of the boiler 12. The dosing valve 10 is a manual ball valve used to manually shut off the pipeline when the dosing pump 9 is under maintenance.

[0026] The specific design of the aforementioned key components will be discussed in detail below:

[0027] The control component 13 includes a PLC and a human-machine interface. The PLC receives signals from various sensors, executes preset logic, and outputs control commands. The human-machine interface is used to display system status, set parameters, and perform manual operations. It can set and control temperature, liquid level, and the start / stop frequency of the dosing pump 9, etc., with one-button operation. The control cabinet of the control component 13 is equipped with electrical components such as circuit breakers, contactors, and intermediate relays to power and control various actuators.

[0028] The heating element 3 is an electric heating wire wound around the outer wall of the dosing tank 1. A temperature sensor 19 is installed inside the dosing tank 1. The control component 13 is electrically connected to the electric heating wire and the temperature sensor 19. The temperature sensor 19 is a PT100 platinum resistance thermometer, which monitors the actual temperature of the liquid in real time and transmits the temperature signal to the control component 13 in real time. The heating element 3 is an externally wound armored electric heating belt with an insulation layer, which is simple in structure, easy to maintain, and provides uniform heating. The probe of the temperature sensor 19 extends below the surface of the liquid to measure the actual liquid temperature.

[0029] The dosing tank 1 is equipped with a level gauge 18, which displays the liquid level in the tank in real time, allowing operators to easily observe the liquid level on-site. A magnetic level gauge 18 can be used, along with a remote level transmitter and high / low level switches, to send signals to the control component 13 for automatic control and alarm functions. The inlet valve 5 on the demineralized water pipeline 4 is a solenoid valve, and the level gauge 18 and inlet valve 5 are electrically connected to the control component 13.

[0030] The dosing pipeline is equipped with a Y-type filter 14 at the inlet of the dosing pump 9 and a check valve 15 at the outlet of the dosing pump 9. The Y-type filter 14 is installed before the dosing pump 9 to filter particulate impurities in the liquid medicine, and the check valve 15 is installed after the dosing pump 9 to prevent backflow of high-pressure water in the boiler 12 feedwater pipeline 11.

[0031] The end of the collecting pipe 7 is connected to a drain pipe 16, and a drain valve 17 is installed on the drain pipe 16. When the equipment is not in use for a long time, the reagent is replaced, or the dosing tank 1 is cleaned, the drain pipe 16 will completely drain the residual liquid in the tank and pipe, which will facilitate maintenance and cleaning and avoid cross-contamination between different batches of reagents.

[0032] The dosing pump 9 is a mechanical diaphragm metering pump, electrically connected to the control component 13. The mechanical diaphragm metering pump allows for precise flow rate adjustment and accurate dosing; the diaphragm design also prevents leakage and extends maintenance intervals. The dosing pump 9 is controlled by the control component 13, enabling remote start / stop and flow rate adjustment.

[0033] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0034] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A polyamine film-forming dosing device for waste heat boilers, comprising a dosing tank, wherein the top of the dosing tank is provided with a reagent dosing port and a demineralized water inlet, and the bottom is provided with a reagent outlet, characterized in that, The dosing tank is equipped with a stirrer and a heating element on its side wall. The stirrer and heating element are electrically connected to the control unit. The top of the dosing tank is connected to a demineralized water pipe. An inlet valve is installed at the connection between the demineralized water pipe and the top of the dosing tank. The bottom of the dosing tank is connected to a collection pipe via a connecting pipe. A connecting valve is installed on the connecting pipe. A shut-off valve is installed on the collection pipe. A dosing pipe is led out from the collection pipe and connected to the water supply pipe. A dosing pump is installed on the dosing pipe. A dosing valve is installed at the front end of the dosing pump. The water supply pipe is connected to the boiler.

2. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The control component includes a PLC and is equipped with a human-machine interface.

3. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The heating element is an electric heating wire wound around the outer wall of the dosing tank. A temperature sensor is installed inside the dosing tank, and the control component is electrically connected to the electric heating wire and the temperature sensor.

4. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The dosing tank is equipped with a level gauge, and the inlet valve on the demineralized water pipeline is a solenoid valve. The level gauge and the inlet valve are electrically connected to the control component.

5. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The dosing pipeline is equipped with a Y-type filter at the inlet of the dosing pump and a check valve at the outlet of the dosing pump.

6. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The end of the collection pipe is connected to a sewage pipe, and a sewage valve is installed on the sewage pipe.

7. The waste heat boiler polyamine film-forming dosing device according to claim 1, characterized in that, The dosing pump is a mechanical diaphragm metering pump, and the dosing pump is electrically connected to the control component.

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