Novel gas-fired boiler condensate water recovery system

Abstract

The utility model discloses a novel condensate water recovery system of a gas-fired boiler, which comprises a condensate water recovery pool, a sodium hydroxide dosing metering pump, a sodium hydroxide solution tank, a programmable logic controller (PLC), a manganese sand filter and a desalting water tank, the sodium hydroxide solution tank is communicated with the condensate water recovery pool through a pipeline provided with a sodium hydroxide dosing metering pump, the condensate water recovery pool is communicated with the manganese sand filter through a pipeline, and a manganese sand filter pump is arranged in the pipeline. Supplementary water of a heat supply pipe network is added to a condensate water recovery system of a gas-fired boiler applied to a boiler room. A manganese sand filter, a condensate water blow-down valve, a recycling water tank and a blow-down valve at the bottom of the desalting water tank ensure that the condensate water meets the water quality requirement of a heat supply pipe network. According to the condensate water recovery system of the gas boiler, condensate water is recycled, water resources are saved, a large amount of heat energy is saved, and economic benefits of a gas boiler room are greatly increased.

Description

Technical Field

[0001] The utility model relates to a gas boiler condensate recovery system, which is suitable for gas boilers of heating enterprises to more energy-efficiently and reliably utilize more condensate in flue gas of a heating network system. Background Art

[0002] With the scarcity of energy and strict environmental protection requirements, energy conservation and emission reduction work has been further carried out. According to the requirements of the Tianjin "Fresh Air Action Plan", the elimination of coal-fired boilers has been accelerated, and the "coal to gas" and "coal to electricity" centralized heating have been actively carried out to significantly reduce pollutant emissions, reduce haze weather, and promote energy conservation and emission reduction in heating. At present, gas boilers reduce the exhaust temperature to improve boiler efficiency and precipitate a large amount of flue gas condensate. After investigating several heat source plants, most thermal power companies were not clear about the composition of flue gas condensate in the early stage of building gas boiler rooms. Some directly pumped the condensate directly into the heating network, causing the iron content of the water quality of the heating network to exceed the standard; some directly cooled a large amount of condensate during operation and discharged it, resulting in a large amount of water resources and heat energy waste. How to effectively utilize the high-quality condensate generated by gas boiler flue gas is a technical problem. Therefore, it is urgent to design a condensate recovery system that can both recycle condensate and ensure the water quality of the heating network. Summary of the invention

[0003] The utility model aims to overcome the above-mentioned shortcomings and provide a gas boiler condensate recovery system which can recover more condensate from the flue gas of the gas boiler and ensure that the iron content of the condensate does not exceed the standard.

[0004] The purpose of the utility model is achieved in this way:

[0005] A gas boiler condensate recovery system comprises a condensate recovery pool, a sodium hydroxide dosing metering pump, a sodium hydroxide solution tank, a PLC controller, a manganese sand filter, and a desalted water tank. It is characterized in that the condensate recovery pool is connected to a condensate inlet pipe, the sodium hydroxide solution tank is connected to the condensate recovery pool through a pipe installed with a sodium hydroxide dosing metering pump, the condensate recovery pool and the manganese sand filter are connected by a pipe, a manganese sand filter pump is installed in the pipe, the manganese sand filter and the desalted water tank are connected by a pipe, the desalted water tank is connected to an output pipe, and a desalted water pump is installed in the output pipe.

[0006] The output pipelines are connected in parallel to the water supply pipelines of the municipal pipe network and the water inlet pipelines of the heating pipe network. The output pipelines are connected in parallel and are respectively equipped with valves.

[0007] The manganese sand filter is equipped with an explosion device.

[0008] A water inlet and flushing interface and a water outlet are respectively installed at the bottom of the manganese sand filter, and valves are respectively installed on the water inlet and flushing interface and the water outlet.

[0009] An air exhaust valve is installed on the desalted water tank, and a sewage exhaust valve is installed at the bottom.

[0010] The sodium hydroxide solution tank is connected with a water inlet pipeline, and a valve is installed in the water inlet pipeline.

[0011] The condensate recovery pool is connected to a condensate inlet pipe, a sewage branch is installed on the condensate inlet pipe, and a sewage valve is installed on the sewage branch.

[0012] Valves are installed in the pipelines.

[0013] The valve is an electric valve, and all pump controls in the system are connected to the PLC controller signal.

[0014] After the boiler is put into operation, if the boiler condensate turns yellow and contains many impurities, the condensate recovery pool valve is closed and the drain valve on the drain branch is opened. When the boiler condensate becomes clear and no longer turns yellow, the condensate recovery pool inlet pipe valve is opened and the drain valve on the drain branch is closed. The gas boiler condensate flows into the recovery pool. The recovery pool and the attached PLC controller receive the PH signal of the recovery pool when the condensate enters the recovery pool. When the PH of the PLC controller is set to 10-10.2, since the condensate is acidic, the sodium hydroxide dosing metering pump is started to automatically add medicine. When the PH reaches 10, the PLC controller sends a pump stop signal, and the sodium hydroxide dosing metering pump automatically stops adding medicine. The PLC controller threshold of the recovery pool liquid level is set to 0.2-1.9m. When the recovery pool liquid level reaches 1.9, the manganese sand filter pump is started to remove iron through the manganese sand filter and pump it into the desalted water tank. When the recovery pool is lower than 0.2m, the PLC controller sends a pump stop signal, and the pump automatically stops filling the desalted water tank. The threshold value of the desalted water tank liquid level PLC controller is set at 0.2-1.9m. When the liquid level reaches 1.9m, the circulation pump automatically replenishes water to the return pipe of the heating network, and the other route is used for municipal water.

[0015] This gas boiler condensate recovery system is not only suitable for gas boilers, but can also be extended to the field of gas-steam combined cycle unit power generation, providing an effective and feasible improvement plan for the future heating and power generation industries, and has good social promotion benefits.

[0016] The beneficial effects of the utility model are:

[0017] The application of gas boiler condensate recovery system in the boiler room increases the supplementary water of the heating network. The manganese sand filter, condensate drain valve, recovery pool, and desalted water tank bottom drain valve ensure that the condensate meets the water quality requirements of the heating network. The utility model recycles condensate, which not only saves water resources, but also saves thermal energy, greatly increasing the economic benefits of the gas boiler room. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the series connection of the gas boiler condensate recovery system involved in the utility model.

[0019] Markings in the figure: 1. Condensate drain valve, 2. Recovery pool inlet valve, 3. Condensate recovery pool, 4. Manganese sand filter pump, 5. Sodium hydroxide solution tank, 6. Metering pump, 7. Manganese sand filter, 8. Desalted water tank, 9. Desalted water pump, 10. Municipal pipe network water inlet valve, 11. Desalted water tank bottom drain valve, 12. Manganese sand filter tank outlet valve, 13. Manganese sand filter tank flushing valve, 14. Manganese sand filter backwash valve, 15. Manganese sand filter inlet valve, 16. Sodium hydroxide solution tank inlet valve, 17. Sodium hydroxide metering pump inlet valve, 18. Manganese sand filter explosion device, 19. Desalted water tank exhaust device, 20. Recovery pool backwash inlet valve, 21. Heating network inlet valve,

[0020] A. Gas boiler condensate, B. Tap water, C. Desalted water, D. Municipal water, E. Heating return water, F. Condensate tank water. DETAILED DESCRIPTION

[0021] The utility model patent is further described below in conjunction with the accompanying drawings:

[0022] like Figure 1 As shown, Figure 1 This is a schematic diagram of the condensate recovery system of the gas boiler in this utility model patent. Figure 1 It can be seen that

[0023] A gas boiler condensate recovery system includes a condensate recovery pool 3, a sodium hydroxide dosing metering pump 6, a sodium hydroxide solution tank 5, and a PLC controller. The condensate recovery pool 3 is connected to a condensate inlet pipe, the condensate recovery pool 3 is connected to a condensate inlet pipe, a recovery pool inlet valve 2 is installed on the condensate inlet pipe, a sewage branch is installed on the condensate inlet pipe, and a sewage valve 1 is installed on the sewage branch.

[0024] The sodium hydroxide solution tank 5 leads to the condensate water recovery pool 3 through a pipeline equipped with a sodium hydroxide dosing metering pump 6. The condensate water recovery pool 3 and the manganese sand filter 7 are connected by a pipeline, and a manganese sand filter pump 4 is installed in the pipeline. The manganese sand filter 7 and the desalted water tank 8 are connected by a pipeline, and the desalted water tank 8 is connected with an output pipeline, and a desalted water pump 9 is installed in the output pipeline.

[0025] The output pipeline is connected in parallel to the municipal water supply pipeline and the heating network water inlet pipeline. The output pipeline is connected in parallel and is respectively installed with a municipal water supply inlet valve 10 and a heating network water inlet valve 21.

[0026] An explosion device 18 is installed on the manganese sand filter 7.

[0027] A water inlet flushing interface and a water outlet interface are respectively installed at the bottom of the manganese sand filter 7, and a manganese sand filter backwashing valve 14 and a manganese sand filter tank flushing valve 13 are respectively installed on the water inlet flushing interface and the water outlet interface.

[0028] An exhaust device 19 is installed on the desalted water tank 8, and a desalted water tank bottom drain valve 11 is installed at the bottom.

[0029] The sodium hydroxide solution tank 5 is connected with a water inlet pipe, and the water inlet pipe is provided with a sodium hydroxide solution tank water inlet 16 .

[0030] The above valves are all electric valves and are connected to the PLC controller signal.

[0031] This condensate recovery system can produce two kinds of unused water, one is heating network replenishment water, and the other is municipal water, which can be used for municipal railing cleaning water in winter or bathing water in large bathhouses, etc. The difference between these two water qualities is the PH value. The heating network replenishment water PH value is 10-10.2, and the municipal water PH value is neutral, which is approximately equal to 7. When the heating network replenishment water is needed, close the recovery pool water inlet valve 2 and open the condensate drain valve 1 before the boiler is put into use. When the condensate drain valve 1 produces clear water without yellowing, close the condensate drain valve 1 and open the recovery pool water inlet valve 2. When the PLC controller threshold value of the recovery pool is set to 10-10.2, the condensate recovery system produces water for heating network replenishment. When the PLC controller threshold value of the recovery pool is set to 6.5-7, the condensate recovery system produces water for municipal water. Take the condensate recovery system for water replenishment of the heating network as an example. When the sodium hydroxide solution is filled with alkaline solution and the pH is lower than 10, the sodium hydroxide metering pump 6 is started to add medicine to the recovery pool. When the pH is higher than 10.2, the sodium hydroxide metering pump is stopped to add medicine to the recovery pool. Open the manganese sand filter tank inlet valve 15, the manganese sand filter tank outlet valve 12, and the desalting water tank inlet valve. The threshold of the recovery water tank liquid level PLC controller is set to 0.2-1.9m. When the recovery water tank level reaches 1.9m, start the manganese sand filter pump to remove iron through the manganese sand filter and pump it into the desalting water tank. When the recovery water pool is lower than 0.2m, the PLC controller sends a pump stop signal, and the pump automatically stops filling the desalting water tank. Open the desalting water pump outlet valve and the heating network inlet valve 21, close the municipal water valve 10, and set the threshold of the desalting water tank liquid level PLC controller to 0.2-1.9m. When the liquid level is 1.9m, the circulation pump automatically replenishes water to the return water pipeline of the heating network. When the liquid level reaches 0.2m, the circulation pump stops replenishing water to the return pipe of the heating network.

[0032] When there are impurities and dirt at the bottom of the recycling pool, the recycling pool inlet valve 2 is closed, and the recycling pool backwash inlet valve 20 is opened to clean the recycling pool.

[0033] In order to ensure the regular backwashing and iron removal effect of the manganese sand filter, close the manganese sand filter water inlet valve 15 and the manganese sand filter tank outlet valve 12, open the manganese sand backwashing water inlet valve 14 and the manganese sand backwashing drain valve 13, and clean the manganese sand filter.

[0034] In order to ensure the water quality of the desalted water tank, open the desalted water tank and regularly test and discharge the desalted water to ensure the water quality.

Claims

1. A gas boiler condensate recovery system, comprising a condensate recovery pool, a sodium hydroxide dosing pump, a sodium hydroxide solution tank, a PLC controller, a manganese sand filter, and a desalted water tank, characterized in that: The condensate recovery pool is connected to a condensate inlet pipe, the sodium hydroxide solution tank is connected to the condensate recovery pool through a pipe equipped with a sodium hydroxide dosing metering pump, the condensate recovery pool and the manganese sand filter are connected by a pipe, a manganese sand filter pump is installed in the pipe, the manganese sand filter and the desalted water tank are connected by a pipe, the desalted water tank is connected to an output pipe, and a desalted water pump is installed in the output pipe.

2. The gas boiler condensate recovery system according to claim 1, characterized in that The output pipelines are connected in parallel to the water supply pipelines of the municipal pipe network and the water inlet pipelines of the heating pipe network. The output pipelines are connected in parallel and are respectively equipped with valves.

3. The gas boiler condensate recovery system according to claim 1, characterized in that The manganese sand filter is equipped with an explosion device.

4. The gas boiler condensate recovery system according to claim 1, characterized in that A water inlet and flushing interface and a water outlet are respectively installed at the bottom of the manganese sand filter, and valves are respectively installed on the water inlet and flushing interface and the water outlet.

5. The gas boiler condensate recovery system according to claim 1, characterized in that The desalted water tank is provided with an explosion device, and a sewage valve is provided at the bottom.

6. The gas boiler condensate recovery system according to claim 1, characterized in that The sodium hydroxide solution tank is connected with a water inlet pipeline, and a valve is installed in the water inlet pipeline.

7. The gas boiler condensate recovery system according to claim 1, characterized in that The condensate recovery pool is connected to a condensate inlet pipe, a sewage branch is installed on the condensate inlet pipe, and a sewage valve is installed on the sewage branch.

8. The gas boiler condensate recovery system according to claim 1, characterized in that Valves are installed in the pipelines.

9. The gas boiler condensate recovery system according to claim 8, characterized in that The valve is an electric valve, and all pumps in the system are connected to the PLC controller signal.

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