Dead steam recovery device

Abstract

The utility model belongs to the technical field of boiler energy-saving equipment, and particularly relates to a dead steam recovery device which comprises a deaerator, a heat exchanger, a deoxidizing water feeding pump, a deaerator deoxidizing head, a demineralized water tank, a manual valve group and a pipeline assembly. According to the dead steam recycling device, efficient recycling of dead steam heat of the deaerator is achieved, heat contained in the dead steam can be directly used for heating deoxygenated feed water without extra power, latent heat of the dead steam is sufficiently transmitted to the deoxygenated feed water through a countercurrent flow heat exchange mechanism in the shell and tube heat exchanger, the energy utilization efficiency is remarkably improved, and the energy consumption is reduced. The system energy consumption is greatly reduced, the energy-saving target in industrial production is achieved, condensed water obtained after dead steam condensation is collected and enters the demineralized water tank, demineralized water is saved, the production cost of an enterprise is reduced, zero emission of dead steam of the deaerator can be thoroughly achieved, steam emission is reduced, the environment is protected, and the requirements for energy conservation and emission reduction are met.

Description

Technical Field

[0001] This utility model relates to the field of boiler energy-saving equipment technology, specifically a waste steam recovery device. Background Technology

[0002] In the operation of modern industrial boiler systems, deaerators play a crucial role in removing dissolved oxygen from water and preventing equipment corrosion. However, after the deaerator completes the deoxygenation process using heated steam, the resulting exhaust steam is mostly discharged directly into the atmosphere without treatment. This traditional method leads to a double loss of resources: on the one hand, the large amount of heat energy contained in the high-temperature exhaust steam is wasted, resulting in low energy efficiency; on the other hand, the demineralized water formed by the condensation of the exhaust steam is also lost, exacerbating water resource consumption. Currently, there is no specialized device that can simultaneously and efficiently recover the heat from the exhaust steam and the condensate, achieving the goal of zero emissions from the deaerator exhaust steam. This has become a pressing technical challenge for the industry. Utility Model Content

[0003] The purpose of this invention is to provide a waste steam recovery device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a waste steam recovery device, comprising a deaerator, a heat exchanger, a deaerator feed water pump, a deaerator deaerator head, a demineralized water tank, a manual valve group, and a pipeline assembly. The heat exchanger is a shell-and-tube structure, with a tube side for flowing deaerator feed water and a shell side for flowing waste steam. The tube side has a deaerator feed water pipe and a deaerator feed water outlet at both ends, and the shell side has a waste steam inlet pipe and a waste steam outlet pipe at both ends.

[0005] The outlet of the deoxygenated water pump is connected to the deoxygenated water supply pipe of the heat exchanger through the pipe assembly, and the deoxygenated water supply pipe of the heat exchanger is connected to the inlet of the deoxygenation head of the deaerator through the pipe assembly.

[0006] The exhaust steam pipe of the deaerator is connected to the exhaust steam inlet pipe of the heat exchanger through a pipe assembly. The exhaust steam pipe of the heat exchanger is used for venting to the air. A condensate pipe is provided at the bottom of the shell side of the heat exchanger.

[0007] The manual valve group includes at least eight manual valves, which are respectively installed on the pipelines between the deaerator feed water pump and the heat exchanger, between the heat exchanger and the deaerator head, between the deaerator and the heat exchanger, and between the heat exchanger and the demineralized water tank.

[0008] Preferably, the pipe assembly includes:

[0009] DN150 pipe: 6m in length, with 4 DN150 elbows;

[0010] DN100 pipe: 10m in length, with 6 DN100 elbows;

[0011] DN65 pipe: 15m in length;

[0012] The operating temperature of all the pipe components is ≤120℃ and the operating pressure is ≤2.6MPa.

[0013] Preferably, the manual valve assembly includes:

[0014] Three DN150 manual valves (PN2.6, temperature 120℃) are respectively installed on the deaerator exhaust steam discharge pipe, the heat exchanger exhaust steam outlet pipe, and the deaerator feedwater main pipe;

[0015] Three DN100 manual valves (PN2.6, temperature 120℃) are respectively installed on the deaerator feed water pump outlet branch pipe, the heat exchanger deaerator feed water outlet branch pipe, and the condensate pipe.

[0016] Two DN65 manual valves (PN2.6, temperature 120℃) are installed on the cooling water inlet pipe and the exhaust pipe, respectively;

[0017] The manual valve controls the opening and closing of the pipeline by rotating the valve stem.

[0018] Preferably, the heat exchanger adopts a counter-current heat exchange design in the tube side and shell side, with exhaust steam flowing downward along the outside of the tube bundle in the shell side and deaerated feedwater flowing counter-currently along the inside of the tube bundle in the tube side.

[0019] Preferably, a guide plate is provided on the pipe between the demineralized water tank and the condensate outlet of the heat exchanger, and the inclination angle of the guide plate is 30° to 45°.

[0020] Preferably, the inner wall of the heat exchanger shell is provided with an anti-corrosion coating, the coating material being high-temperature and corrosion-resistant epoxy resin or nickel-phosphorus alloy, with a thickness ≥0.3mm.

[0021] Preferably, a flow meter is installed on the pipeline between the deaerator and the heat exchanger, and the flow meter is an electromagnetic flow meter or a vortex flow meter.

[0022] Preferably, the control logic of the exhaust steam recovery device is as follows: the exhaust steam discharge rate is adjusted online according to the deaerator effluent water quality, and the cooling water inlet rate is adjusted online according to the heat exchanger effluent temperature.

[0023] Compared with the prior art, the beneficial effects of this utility model are:

[0024] This waste steam recovery device enables the recovery and utilization of heat from the waste steam of the deaerator. The heat from the waste steam is used to heat the deaerator feedwater without power, which improves energy utilization efficiency and saves energy.

[0025] This waste steam recovery device collects the condensate after the waste steam is condensed and sends it to the demineralized water tank, saving demineralized water and reducing the company's production costs.

[0026] This waste steam recovery device can completely achieve zero emissions of waste steam from the deaerator, reduce steam discharge, protect the environment, and meet the requirements of energy conservation and emission reduction. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall process for waste steam recovery according to this utility model.

[0028] In the diagram: 1. Deaerator; 2. Waste steam inlet pipe; 3. Heat exchanger; 4. Waste steam outlet pipe; 5. Deaerator feedwater pipe; 6. Condensate pipe; 7. Demineralized water tank. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1 This utility model provides a technical solution: a waste steam recovery device, including a deaerator 1, a heat exchanger 3, a deaerator feed water pump, a deaerator deaerator head, a demineralized water tank 7, a manual valve group and a pipeline assembly. The heat exchanger 3 is a shell-and-tube structure, with a tube side for flowing deaerator feed water and a shell side for flowing waste steam. The tube side is provided with a deaerator feed water pipe 5 and a deaerator feed water outlet at both ends, and the shell side is provided with a waste steam inlet pipe 2 and a waste steam outlet pipe 4 at both ends.

[0031] The outlet of the deaerator water pump is connected to the deaerator water supply pipe 5 of the heat exchanger 3 through a pipe assembly. The deaerator water supply pipe 5 of the heat exchanger 3 is connected to the inlet of the deaerator head through a pipe assembly, forming a heating circulation path for the deaerator water supply.

[0032] The exhaust steam discharge pipe 4 of the deaerator 1 is connected to the exhaust steam input pipe 2 of the heat exchanger 3 through a pipe assembly. The exhaust steam discharge pipe 4 of the heat exchanger 3 is used for venting to the air. A condensate pipe 6 is provided at the bottom of the shell side of the heat exchanger 3. The condensate pipe 6 is connected to the inlet end of the demineralized water tank 7 through a pipe assembly, forming a condensation and recovery path for the exhaust steam.

[0033] The manual valve assembly includes at least eight manual valves, which are respectively installed on the pipelines between the deaerator feed water pump and heat exchanger 3, between heat exchanger 3 and deaerator head, between deaerator 1 and heat exchanger 3, and between heat exchanger 3 and demineralized water tank 7, for controlling the on / off of water and steam flow and regulating flow rate.

[0034] Piping components include:

[0035] DN150 pipe: 6m in length, with 4 DN150 elbows, used to connect large-diameter pipe paths such as the exhaust steam outlet of the deaerator and the exhaust steam inlet of the heat exchanger;

[0036] DN100 pipe: 10m in length, with 6 DN100 elbows, used to connect the deaerator feed water pump to the heat exchanger, the heat exchanger to the deaerator head, etc., in medium-diameter pipe paths.

[0037] DN65 pipe: 15m in length, used for connecting small-diameter pipe paths such as the condensate outlet of the heat exchanger and the demineralized water tank;

[0038] The operating temperature of all pipeline components is ≤120℃ and the operating pressure is ≤2.6MPa, meeting the pressure and temperature resistance requirements of the waste steam recovery system.

[0039] The manual valve assembly includes:

[0040] Three DN150 manual valves with a PN2.6 rating and a temperature of 120℃ are installed on the deaerator exhaust steam discharge pipe, the heat exchanger exhaust steam outlet pipe, and the deaerator feedwater main pipe, respectively.

[0041] Three DN100 manual valves with a PN2.6 rating and a temperature of 120℃ are installed on the deaerator feedwater pump outlet branch pipe, the heat exchanger deaerator feedwater outlet branch pipe, and the condensate pipe, respectively.

[0042] Two DN65 manual valves PN2.6, with a temperature of 120℃, are installed on the cooling water inlet pipe and the exhaust pipe, respectively;

[0043] Manual valves control the opening and closing of pipelines by rotating the valve stem and have the properties of resistance to steam corrosion and high temperature resistance.

[0044] The heat exchanger adopts a counter-current heat exchange design in the tube side and shell side. The exhaust steam flows downward along the outside of the tube bundle in the shell side, while the deaerated feedwater flows counter-currently along the inside of the tube bundle in the tube side to maximize heat exchange efficiency.

[0045] A baffle plate is installed on the pipe between the demineralized water tank and the condensate outlet of the heat exchanger. The baffle plate is inclined at an angle of 30° to 45° to guide the condensate into the demineralized water tank evenly and reduce the impact.

[0046] The inner wall of the heat exchanger shell is equipped with an anti-corrosion coating. The coating material is high-temperature and corrosion-resistant epoxy resin or nickel-phosphorus alloy with a thickness of ≥0.3mm to extend the service life of the equipment.

[0047] A flow meter is installed on the pipeline between the deoxygenated feedwater pump and the heat exchanger. The flow meter is either an electromagnetic flow meter or a vortex flow meter, which is used to monitor the deoxygenated feedwater flow rate in real time and feed it back to the valve regulation system.

[0048] The control logic of the exhaust steam recovery device is as follows: adjust the exhaust steam discharge volume online according to the deaerator effluent water quality, and adjust the cooling water inlet volume online according to the heat exchanger effluent temperature to achieve a dynamic balance between exhaust steam condensation and deaeration effect.

[0049] Working principle: The exhaust steam discharged from deaerator 1 enters the shell side of heat exchanger 3 through exhaust steam inlet pipe 2, forming a counter-current heat exchange with the deaerated feedwater in the tube side. The exhaust steam flows downward along the outside of the tube bundle in the shell side, releases latent heat, and condenses into liquid water, which flows into the demineralized water tank 7 through the condensate pipe 6 at the bottom of the shell side. The deaerated feedwater pump delivers water at a temperature of 50-55℃ and a pressure of 1.2-1.3MPa. The deoxygenated feedwater is fed into the tube side of the heat exchanger. After absorbing the heat of the exhaust steam by flowing counter-currently along the inner side of the tube bundle, it enters the deaerator head of the deaerator through the deaerator feedwater pipe 5 for thermal deaeration. The system adjusts the exhaust steam discharge volume by monitoring the deaerator effluent water quality online and adjusts the cooling water inlet volume according to the heat exchanger effluent temperature to achieve a dynamic balance between efficient exhaust steam condensation and deaeration effect. At the same time, manual valve groups are used to control the fluid on / off and flow rate of each pipeline. The pipeline components are adapted to different paths according to the pipe diameter to meet the system's pressure requirements of ≤2.6MPa and temperature requirements of ≤120℃. The anti-corrosion coating on the inner wall of the shell side ensures the durability of the equipment. The flow meter monitors the feedwater flow rate in real time to assist valve adjustment, ultimately achieving the goals of exhaust steam heat recovery, condensate collection and zero discharge.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A steam recovery plant comprising a deaerator (1), a heat exchanger (3), a deaerated feed water pump, a deaerator head, a demineralized water tank (7), a manual valve set and a piping assembly, characterized in that: The heat exchanger (3) is of shell and tube structure, internally provided with a tube pass for flowing oxygenated feed water and a shell pass for flowing exhaust steam, and the tube pass is provided with an oxygenated feed water pipe (5) and an oxygenated feed water outlet at two ends respectively, and the shell is provided with an exhaust steam input pipe (2) and an exhaust steam discharge pipe (4) at two ends respectively; The water outlet end of the oxygenated feed water pump is connected with the oxygenated feed water pipe (5) of the heat exchanger (3) through the pipe assembly, and the oxygenated feed water pipe (5) of the heat exchanger (3) is connected with the water inlet end of the oxygenated head of the deaerator through the pipe assembly; The exhaust steam discharge pipe (4) of the deaerator (1) is connected with the exhaust steam input pipe (2) of the heat exchanger (3) through the pipe assembly, the exhaust steam discharge pipe (4) of the heat exchanger (3) is used for discharging to the air, and the bottom of the shell pass of the heat exchanger (3) is provided with a condensate pipe (6) which is connected with the water inlet end of the demineralized water tank (7) through the pipe assembly; The manual valve group comprises at least eight manual valves which are arranged on the pipes between the oxygenated feed water pump and the heat exchanger (3), the heat exchanger (3) and the oxygenated head of the deaerator, the deaerator (1) and the heat exchanger (3), and the heat exchanger (3) and the demineralized water tank (7) respectively.

2. A steam recovery apparatus according to claim 1, characterised in that: The pipe assembly comprises: DN150 pipe: 6m in length, matched with four DN150 elbows; DN100 pipe: 10m in length, matched with six DN100 elbows; DN65 pipe: 15m in length; The working temperature of the pipe assembly is ≤120℃, and the working pressure is ≤2.6MPa.

3. A steam recovery apparatus according to claim 1, wherein: The manual valve group comprises: Three DN150 manual valves PN2.6, temperature 120℃, arranged on the deaerator exhaust steam discharge pipe, the heat exchanger exhaust steam outlet pipe and the oxygenated feed water main pipe respectively; Three DN100 manual valves PN2.6, temperature 120℃, arranged on the deaerator exhaust steam discharge pipe, the heat exchanger exhaust steam outlet pipe and the oxygenated feed water main pipe respectively; Two DN65 manual valves PN2.6, temperature 120℃, arranged on the cooling water inlet pipe and the exhaust pipe respectively; The manual valve controls the opening and closing of the pipe through the rotation of the valve stem.

4. A steam recovery apparatus according to claim 1, wherein: The tube pass and the shell pass of the heat exchanger adopt counter-flow heat exchange design.

5. A steam recovery apparatus according to claim 1, wherein: A flow guide plate is arranged on the pipe between the demineralized water tank and the condensate outlet of the heat exchanger, and the inclination angle of the flow guide plate is 30°-45°.

6. A steam recovery apparatus according to claim 1, wherein: The inner wall of the shell pass of the heat exchanger is provided with a corrosion-resistant coating, and the coating material is high-temperature-resistant and corrosion-resistant epoxy resin or nickel-phosphorus alloy, and the thickness is ≥0.3mm.

7. A steam recovery apparatus according to claim 1, wherein: A flowmeter is arranged on the pipe between the oxygenated feed water pump and the heat exchanger, and the flowmeter is of electromagnetic flowmeter or vortex flowmeter type.

8. A steam recovery apparatus according to claim 1, wherein: The control logic of the exhaust steam recovery device is that the exhaust steam discharge amount is adjusted online according to the water quality of the deaerator outlet, and the cooling water inlet amount is adjusted online according to the outlet water temperature of the heat exchanger.

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