A low-pressure cylinder zero-output condensate water treatment device for a heat supply unit

Abstract

A condensate treatment device for low-pressure cylinders of heating units operating at zero output is disclosed, relating to the field of condensate treatment in heating units. This device solves the corrosion and scaling problems caused by excessive hydrogen conductivity in condensate from ultra-high pressure heating units. The device includes an anion exchange bed, a resin trap, an electric demineralized water inlet valve, an inlet, and an outlet. The inlet is connected to the inlet of the anion exchange bed; the electric demineralized water inlet valve is connected to the inlet of the anion exchange bed via a pipeline; the outlet is connected to the outlet of the anion exchange bed; the resin trap is installed in series between the outlet and the anion exchange bed via a pipeline; the anion exchange bed is a sealed tank, internally equipped with: a water distribution device, two sets of dual-speed water caps, OH-type resin, an upper perforated plate, and a lower perforated plate. This device is suitable for treating condensate generated during zero-output operation of the low-pressure cylinders of ultra-high pressure heating units.

Description

Technical Field

[0001] This invention relates to the field of water treatment, and more specifically to the field of condensate treatment for heating units. Background Technology

[0002] When the low-pressure cylinder of the ultra-high pressure heating unit operates at zero output, most of the steam enters the heat exchanger of the heating network for heating, and the resulting condensate is recovered to the deaerator. Only a small portion of the steam enters the low-pressure cylinder to cool the low-pressure rotor and remove heat generated by the blower. According to the technical requirements for the zero-output modification of the low-pressure cylinder, the intake air volume of the low-pressure cylinder is approximately 20 t / h, resulting in a reduction in condensate volume. Under this condition, to ensure the safe and stable operation of the condensate pump, the condensate pump needs to operate in recirculation mode, with a recirculation flow rate of approximately 100 t / h. With a stable condensate vacuum, the reduced condensate volume and the resulting carbon dioxide enrichment lead to an increase in carbon dioxide content in the condensate. This is the fundamental reason for the excessive hydrogen conductivity in the condensate of the ultra-high pressure heating unit during zero-output operation of the low-pressure cylinder. Furthermore, the ultra-high pressure unit does not have a condensate polishing device; the condensate enters the deaerator through the low-pressure feedwater system, easily causing corrosion of the condensate and the heated surfaces of the low-pressure feedwater system. Although some carbon dioxide can be removed by adjusting the opening of the deaerator exhaust valve, a large amount of heat energy is wasted, affecting the economic operation of the unit. Summary of the Invention

[0003] To address the corrosion and scaling issues caused by excessive hydrogen conductivity in condensate of ultra-high pressure heating units.

[0004] This invention provides the following solution:

[0005] A condensate treatment device for a low-pressure cylinder of a heating unit with zero output, the device comprising an anion bed, a resin trap, an electric demineralized water inlet gate, an inlet and an outlet;

[0006] The inlet is connected to the inlet of the anion bed; the demineralized water inlet electric gate is connected to the inlet of the anion bed via a pipeline; the outlet is connected to the outlet of the anion bed; the resin trap is installed in series between the outlet and the anion bed via a pipeline.

[0007] The anion bed is a sealed tank, and the tank is equipped with: a water distribution device, two sets of dual-speed water caps, OH-type resin, an upper perforated plate and a lower perforated plate;

[0008] The condensate first flows into the inlet of the anion bed and then passes through the water distribution device. It then further permeates downward through the upper perforated plate, then through the OH-type resin, and finally through the lower perforated plate. A set of dual-speed water caps is installed on the upper perforated plate, and a set of dual-speed water caps is installed on the lower perforated plate.

[0009] Preferably, the influent flow rate of the anion bed is 100 m³ / h, and the flow velocity is 90 m / h to 100 m / h.

[0010] Preferably, the diaphragm bed further includes a viewing hole; the viewing hole allows observation of the condensate treatment process inside the diaphragm bed.

[0011] Preferably, the device further includes an inlet electric gate and an outlet electric gate; the inlet electric gate is installed via a pipeline connecting the inlet to the inlet of the resin bed; the outlet electric gate is installed via a pipeline between the outlet and the resin catcher.

[0012] Preferably, the device further includes a pressure boosting electric door and an exhaust electric door. The pressure boosting electric door is connected to the inlet of the vaginal bed via a pipeline in parallel with the water inlet electric door; the exhaust electric door is connected to the inlet of the vaginal bed.

[0013] Preferably, the device further includes two pressure gauges, one of which is used to collect and display the pressure of the inlet pipe of the vaginal bed, and the other pressure gauge is used to collect and display the pressure of the outlet pipe of the vaginal bed.

[0014] Preferably, the device further includes a hydrogen conductivity meter for detecting the hydrogen conductivity of the condensate after treatment by the resin trap.

[0015] Preferably, the device further includes a bypass electric gate; the bypass electric gate is connected in series between the water inlet and the water outlet.

[0016] Preferably, the device further includes an automatic control system, which acquires the analog signal output by the pressure gauge; the automatic control system outputs control signals to the inlet electric valve, the pressure boosting electric valve, the exhaust electric valve, the outlet electric valve, and the bypass electric valve.

[0017] Preferably, the automatic control system has an embedded control module implemented by a computer program, the control module comprising:

[0018] Signal acquisition unit: used to acquire the two pressure signals sent by the two pressure gauges in real time;

[0019] Signal processing unit: used to compare two pressure signals, and when the two pressure signals are the same, send a valve control signal to the valve control unit;

[0020] Valve control unit: When a valve control signal is received, it sends control signals to the pressure boosting electric valve, the inlet electric valve, and the outlet electric valve respectively, so that the pressure boosting electric valve closes and the inlet and outlet electric valves open.

[0021] The beneficial effects of this invention are as follows:

[0022] 1. Using this device and method to treat condensate can make the condensate water quality meet the requirements of "Water and Steam Quality of Thermal Power Generating Units and Steam Power Equipment" (GB / T12145-2016) which specifies a hydrogen conductivity of 0.30≤μS / cm.

[0023] 2. This invention can effectively prevent accidents caused by abnormal water and steam quality in the unit due to carbonates and carbon dioxide, slow down the corrosion rate of the thermal system, and ensure the safe and stable operation of the unit.

[0024] 3. The process is simple, easy to operate, advanced, and automated. It requires minimal inspection and maintenance, has stable results, and is convenient and cost-effective for operation and management. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the condensate treatment device described in Embodiment 1;

[0026] Figure reference numerals: 1. Anion bed; 2. Resin trap; 3. Electric inlet valve; 4. Electric pressure boosting valve; 5. Electric exhaust valve; 6. Electric outlet valve; 7. Electric demineralized water inlet valve; 8. Bypass valve; 9. Water distribution device; 10. Dual-speed water cap; 11. OH-type resin; 12. Inspection hole; 13. Upper perforated plate; 14. Lower perforated plate; 15. Pressure gauge; 16. Hydrogen conductivity meter; 17. Automatic control system; 18. Inlet; 19. Outlet. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0028] Implementation Method 1: See Figure 1 This embodiment describes a zero-output condensate treatment device for a low-pressure cylinder of a heating unit. The device includes an anion bed 1, a resin trap 2, an electric demineralized water inlet gate 7, a water inlet 18, and a water outlet 19.

[0029] The inlet 18 is connected to the inlet of the anion bed 1; the inlet of the anion bed 1 is also connected to the external demineralized water supply end through the demineralized water inlet electric gate 7; the outlet of the anion bed 1 is connected to the outlet 19; the resin trap 2 is connected in series between the anion bed 1 and the outlet 19.

[0030] The anion bed 1 is a sealed tank, and the tank is equipped with: a water distribution device 9, two sets of dual-speed water caps 10, OH type resin 11, an upper perforated plate 13 and a lower perforated plate 14;

[0031] During the process of condensate flowing from the inlet to the outlet of the anion bed 1, it flows sequentially through the water distribution device 9, the upper perforated plate 13, the OH type resin 11 and the lower perforated plate 14; a set of dual-speed water caps 10 are installed on the upper perforated plate 13 and a set of dual-speed water caps 10 are installed on the lower perforated plate 14.

[0032] The working principle of the condensate treatment device described in this embodiment is as follows: Condensate enters the anion bed 1 through the inlet 18, is evenly distributed by the water distribution device 9, and then permeates downward through the upper perforated plate 13. It then undergoes desalination and impurity removal treatment through the OH-type resin 11, and finally flows out through the lower perforated plate 14. The resin trap 11 further purifies the condensate, removing residual resin particles. This treatment process ensures that the condensate meets the zero-output requirement of the low-pressure cylinder of the heating unit.

[0033] Implementation Method 2: This implementation method is a further limitation of the zero-output condensate treatment device for the low-pressure cylinder of a heating unit described in Implementation Method 1. In this implementation method, the inlet flow rate of the anion bed 1 is 100 m³ / h, and the flow velocity is 90 m / h to 100 m / h.

[0034] By limiting the influent flow rate and design flow velocity, it is possible to ensure that the condensate has an appropriate residence time in the anion bed 1 in order to effectively remove suspended solids and biological contaminants.

[0035] Implementation Method 3: This implementation method is a further limitation of the zero-output condensate treatment device for a low-pressure cylinder of a heating unit described in Implementation Method 1. In this implementation method, the anion bed 1 further includes a viewing hole 12, which is provided on the side wall of the sealed tank. A transparent plate is embedded and fixed in the viewing hole 12, and the transparent plate is sealed and fixedly connected to the side wall of the sealed tank.

[0036] The sight glass 12 provides real-time monitoring and observation, helping operators understand the operation of the condensate treatment unit, promptly identify problems, and take appropriate measures. This helps ensure the normal and efficient operation of the condensate treatment unit, improving the efficiency and quality of condensate treatment.

[0037] Implementation Method 4: This implementation method is a further limitation of the zero-output condensate treatment device for a low-pressure cylinder of a heating unit described in Implementation Method 3. In this implementation method, the device further includes an inlet electric valve 3 and an outlet electric valve 6; the inlet electric valve 3 is connected in series between the inlet 18 and the inlet of the anion bed 1; the outlet electric valve 6 is connected in series between the outlet 19 and the resin trap 2.

[0038] By adding inlet electric valve 3 and outlet electric valve 6, the inlet and outlet flow rates of condensate can be controlled more flexibly to adapt to different operating conditions and needs. This helps improve the operating efficiency and stability of the condensate treatment unit, ensuring the treatment effect and quality of the condensate.

[0039] Implementation Method 5: This implementation method is a further limitation of the zero-output condensate treatment device for the low-pressure cylinder of a heating unit described in Implementation Method 4. In this implementation method, the device further includes a booster electric valve 4 and an exhaust electric valve 5. The booster electric valve 4 is connected in parallel with the water inlet electric valve 3. The exhaust electric valve 5 is connected to the exhaust port of the anion bed 1.

[0040] By adding electric pressure boosting valves and electric exhaust valves, the inlet and outlet pressures of condensate can be adjusted, increasing the flow rate and efficiency of condensate in the anion exchange bed and ensuring the normal operating pressure inside the anion exchange bed. This helps improve the operating efficiency and stability of the condensate treatment unit, further optimizing the treatment effect and quality of the condensate.

[0041] Implementation Method Six: This implementation method is a further limitation of the zero-output condensate treatment device for a low-pressure cylinder of a heating unit described in Implementation Method Five. In this implementation method, the device further includes two pressure gauges 15, one of which is used to collect and display the pressure of the inlet 18 of the anion bed 1, and the other pressure gauge 15 is used to collect and display the pressure of the outlet 19.

[0042] By installing pressure gauges, the pressure before the inlet electric valve and the pressure at the outlet of the condensate bed can be monitored in real time. The pressure gauges provide pressure information within the condensate treatment unit, helping operators understand the system's operating status and pressure changes.

[0043] Implementation Method Seven: This implementation method is a further limitation of the zero-output condensate treatment device for a low-pressure cylinder of a heating unit described in Implementation Method Six. In this implementation method, the device further includes a hydrogen conductivity meter 16, which is used to detect the hydrogen conductivity of the condensate at the outlet 19.

[0044] By installing a hydrogen conductivity meter, the effluent quality of the condensate treatment unit can be monitored in real time, thereby evaluating the effectiveness of condensate treatment and the stability of water quality.

[0045] Implementation Method 8: This implementation method is a further limitation of the zero-output condensate treatment device for the low-pressure cylinder of a heating unit described in Implementation Method 7. In this implementation method, the device further includes a bypass electric door 8; the bypass electric door 8 is connected in series between the water inlet 18 and the water outlet 19.

[0046] By installing a bypass electric gate, the flow path of condensate can be adjusted under specific circumstances to meet different treatment requirements.

[0047] When the hydrogen conductivity of the condensate meets the standard requirements, the bypass electric valve 8 is opened, and the condensate returns to the condenser via the bypass.

[0048] When the hydrogen conductivity of the condensate exceeds the standard requirements, open the pressure boosting electric valve 4. When the pressure indicated by the two pressure gauges 15 is the same, open the inlet electric valve 3 and the outlet electric valve 6, start the anion bed 1 into operation, and close the bypass electric valve 8 at the same time.

[0049] When the hydrogen conductivity meter reading is ≥0.15μS / cm or the pressure difference of pressure gauge 15 is greater than 0.3MPa, open the bypass electric valve 8, close the inlet electric valve 3 and the outlet electric valve 6, open the exhaust electric valve 5 to release pressure, and close the exhaust electric valve 5 when the pressure gauge 15 indicates zero pressure, and the anion bed 1 is taken out of operation.

[0050] Implementation Method Nine: This implementation method is a further limitation of the zero-output condensate treatment device for a low-pressure cylinder of a heating unit described in Implementation Method Eight. In this implementation method, the device further includes an automatic control system 17, which is used to collect the pressure signal output by the pressure gauge 15. The automatic control system 17 outputs control signals to the inlet electric valve 3, the pressure boosting electric valve 4, the exhaust electric valve 5, the outlet electric valve 6, and the bypass electric valve 8, respectively.

[0051] The automatic control system 17 can control the inlet electric valve 3, the booster electric valve 4, the exhaust electric valve 5, the outlet electric valve 6, and the bypass electric valve 8 according to preset parameters and set logic, so as to realize the automatic operation and regulation of the condensate treatment device.

[0052] Implementation Method 10: This implementation method further defines the zero-output condensate treatment device for the low-pressure cylinder of a heating unit described in Implementation Method 9. In this implementation method, the automatic control system 17 has a computer program-implemented control module embedded inside. The control module includes:

[0053] Signal acquisition unit: used to acquire the two pressure signals sent by the two pressure gauges 15 in real time;

[0054] Signal processing unit: used to compare two pressure signals, and when the two pressure signals are the same, send a valve control signal to the valve control unit;

[0055] Valve control unit: When a valve control signal is received, it sends control signals to the pressure boosting electric valve 4, the inlet electric valve 3, and the outlet electric valve 6 respectively, so that the pressure boosting electric valve 4 closes and the inlet electric valve 3 and the outlet electric valve 6 open.

[0056] This implementation uses an automatic control system 17 to monitor the internal pressure and control the opening and closing of relevant valves when necessary to ensure timely treatment of condensate.

Claims

1. A low-pressure cylinder zero-power condensate water treatment device for a heat supply unit, characterized in that: The device comprises a cathode bed (1), a resin catcher (2), an inlet desalted water electric gate (7), a water inlet (18) and a water outlet (19); The water inlet (18) is communicated with the inlet of the cathode bed (1); the inlet of the cathode bed (1) is also communicated with the water supply end of the external desalted water through the inlet desalted water electric gate (7); the outlet of the cathode bed (1) is communicated with the water outlet (19); the resin catcher (2) is connected in series between the cathode bed (1) and the water outlet (19); The cathode bed (1) is a sealed tank, and the inside of the tank is provided with a water distribution device (9), two groups of double-speed water caps (10), OH type resin (11), an upper porous plate (13) and a lower porous plate (14); During the process of the condensate water flowing from the inlet to the outlet of the cathode bed (1), the condensate water flows through the water distribution device (9), the upper porous plate (13), the OH type resin (11) and the lower porous plate (14) in sequence; a group of double-speed water caps (10) are installed on the upper porous plate (13), and a group of double-speed water caps (10) are installed on the lower porous plate (14); The device further comprises a water inlet electric gate (3) and a water outlet electric gate (6); the water inlet electric gate (3) is connected in series between the water inlet (18) and the inlet of the cathode bed (1); the water outlet electric gate (6) is connected in series between the water outlet (19) and the resin catcher (2); The device further comprises a pressure boosting electric gate (4) and an exhaust electric gate (5); the pressure boosting electric gate (4) is connected in parallel with the water inlet electric gate (3); the exhaust electric gate (5) is communicated with the exhaust port of the cathode bed (1); The device further comprises two pressure gauges (15), one of which is used to collect and display the pressure of the water inlet (18) of the cathode bed (1), and the other is used to collect and display the pressure of the water outlet (19); The device further comprises a hydrogen conductivity meter (16) for detecting the hydrogen conductivity of the condensate water at the water outlet (19); The device further comprises a bypass electric gate (8); the bypass electric gate (8) is connected in series between the water inlet (18) and the water outlet (19); The device further comprises an automatic control system (17) for collecting the pressure signals output by the two pressure gauges (15); the automatic control system (17) outputs control signals to the water inlet electric gate (3), the pressure boosting electric gate (4), the exhaust electric gate (5), the water outlet electric gate (6) and the bypass electric gate (8) respectively; The automatic control system (17) is embedded with a computer program implemented control module, and the control module comprises: A signal acquisition unit for acquiring two pressure signals sent by the two pressure gauges (15) in real time; A signal processing unit for comparing the two pressure signals, and sending a valve control signal to the valve control unit when the two pressure signals are the same; Valve control unit: for when receiving valve control signal, respectively send control signal to booster electric door (4), water inlet electric door (3) and water outlet electric door (6), make booster electric door (4) close, water inlet electric door (3) and water outlet electric door (6) open.

2. The condensate treatment device for a low-pressure cylinder of a heating unit with zero output according to claim 1, characterized in that: The water inlet flow of the female bed (1) is 100 m^3 / h, and the flow rate is 90 m / h-100 m / h.

3. The condensate treatment device for a low-pressure cylinder of a heating unit with zero output according to claim 1, characterized in that: The female bed (1) further comprises a peephole (12) arranged on the side wall of the sealed tank body, and a transparent plate is embedded and fixed in the peephole (12), and the transparent plate is in sealing and fixed connection with the side wall of the sealed tank body.

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