Waste heat furnace gas utilization system

Abstract

The utility model discloses a waste heat furnace gas utilization system, which comprises a heat recoverer, a heat exchanger, a heat exchanger and a heat exchanger, the furnace gas circulating pipeline is connected with the heat recoverer and is used for circulating furnace gas; the heating water circulating pipeline is connected with the heat recoverer and is used for circulating heating water; wherein the furnace gas circulating pipeline comprises a high-quality and heavy-quality furnace gas washing tower and a condenser; the optimal and heavy furnace gas washing tower is connected with the input end of the heat recoverer, and the condenser is connected with the output end of the heat recoverer; wherein the heating water circulation pipeline comprises a cold water barrel, a hot water barrel, a cold water pump, a hot water pump and a water segregator; the cold water barrel is connected with a water inlet of the heat recoverer through a frequency conversion cold water pump, the hot water barrel is connected with a water outlet of the heat recoverer, the hot water barrel is connected with the water distributor through a hot water pump, and the water distributor is connected with a heating system.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy, and particularly relates to a waste heat furnace gas utilization system. Background Art

[0002] In many industrial production processes, a large amount of waste heat furnace gas is generated. These furnace gases contain rich heat energy, but are often not fully utilized at present, resulting in waste of energy. For example, in some companies, there are many problems in the existing heating forms. The office area and living area are centrally heated by desalted water heated by steam in the steam turbine workshop, and the production area is heated by 0.5MPa steam. After the steam heating in the production area during the heating period, a steam trap is used for discharge, resulting in great waste of water resources and energy, and there are safety hazards in steam heating.

[0003] In the related art, the 85°C furnace gas (mainly composed of water vapor) generated by six heavy ash calcining furnaces in the calcining workshop is all discharged except for partial recovery of condensed water. This not only causes energy waste, but also has an adverse impact on the environment.

[0004] Therefore, how to improve the energy utilization rate in the factory, reduce resource waste, and ensure production safety are the key issues concerned by those skilled in the art. Content of the Utility Model

[0005] To solve the problems existing in the prior art, the utility model provides a waste heat furnace gas utilization system, which solves the problem of low utilization efficiency of furnace gas waste heat.

[0006] To achieve the purpose of the utility model, the following technical solutions are adopted in the utility model: A waste heat furnace gas utilization system, comprising:

[0007] A heat recovery device, configured to exchange heat between the waste heat of the furnace gas and the heating water;

[0008] A furnace gas circulation pipeline connected to the heat recovery device, for circulating the furnace gas;

[0009] A heating water circulation pipeline connected to the heat recovery device, for circulating the heating water;

[0010] Wherein, the furnace gas circulation pipeline includes: a heavy furnace gas scrubbing tower and a condenser; the heavy furnace gas scrubbing tower is connected to the input end of the heat recovery device, and the condenser is connected to the output end of the heat recovery device;

[0011] Wherein, the heating water circulation pipeline includes: a cold water bucket, a hot water bucket, a cold water pump, a hot water pump, and a water distributor; the cold water bucket is connected to the water inlet of the heat recovery device through a variable frequency cold water pump, the hot water bucket is connected to the water outlet of the heat recovery device, the hot water bucket is connected to the water distributor through a hot water pump, and the water distributor is connected to the heating system.

[0012] Optionally, the heating water circulation pipeline further includes:

[0013] A steam pipeline for providing heating steam;

[0014] A heater is connected between the hot water bucket and the water distributor. The steam inlet of the heater is connected to the steam pipeline, and the heater is used for secondary heating of the heating water.

[0015] Optionally, the furnace gas circulation pipeline further includes:

[0016] A furnace gas filtering device is connected to the furnace gas circulation pipeline, and the furnace gas filtering device is used for filtering the furnace gas.

[0017] Optionally, the furnace gas circulation pipeline further includes:

[0018] A shell-and-tube heat exchanger is used for condensing the heavy ash waste heat furnace steam to obtain the entrained moisture in the furnace gas, so as to replace the washing water in the excellent heavy process for use.

[0019] Optionally, the furnace gas circulation pipeline further includes:

[0020] An induced draft fan is used to drive the furnace gas to flow in the furnace gas circulation pipeline.

[0021] Optionally, the circulating water of the condenser adopts network water.

[0022] Optionally, the heat recovery device is a hybrid heat exchanger.

[0023] Optionally, the cold water pump is a variable frequency cold water pump.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The effective utilization of furnace gas waste heat is realized, the waste heat of the furnace gas is exchanged with the heating water in terms of heat, the energy utilization rate is improved, and the waste of energy is reduced.

[0026] Through the design of the furnace gas circulation pipeline, the furnace gas can circulate in the system and fully exchange heat with the heat recovery device, improving the efficiency of waste heat recovery.

[0027] The setting of the heating water circulation pipeline ensures that the heating water can effectively absorb the waste heat of the furnace gas and transfer the heat to the heating system, providing stable heating for the office area, living area and production area, improving the heating conditions, and at the same time avoiding the great waste of water resources and energy, and reducing the safety hazards brought by steam heating. Description of the Drawings

[0028] Figure 1Schematic diagram of a waste heat furnace gas utilization system provided by an embodiment of the present application;

[0029] In the figure: 1 - Heat recovery device, 21 - Premium heavy furnace gas scrubbing tower, 22 - Condenser, 31 - Cold water bucket, 32 - Hot water bucket, 33 - Cold water pump, 34 - Hot water pump, 35 - Water separator. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model:

[0031] Please refer to Figure 1 , Figure 1 Schematic diagram of a waste heat furnace gas utilization system provided by an embodiment of the present application.

[0032] In this embodiment, the system may include:

[0033] A heat recovery device 1 for exchanging heat between the waste heat of the furnace gas and the heating water;

[0034] For exchanging heat between the waste heat of the furnace gas and the heating water. It can fully recover the waste heat in the furnace gas, improve the energy utilization rate, and reduce energy waste.

[0035] A furnace gas circulation pipeline connected to the heat recovery device 1 for circulating the furnace gas;

[0036] Among them, the furnace gas circulation pipeline includes: a premium heavy furnace gas scrubbing tower 21 and a condenser 22; the premium heavy furnace gas scrubbing tower 21 is connected to the input end of the heat recovery device 1, and the condenser 22 is connected to the output end of the heat recovery device 1. For circulating the furnace gas, including a premium heavy furnace gas scrubbing tower 21 and a condenser 22. The premium heavy furnace gas scrubbing tower 21 is connected to the input end of the heat recovery device 1, and the condenser 22 is connected to the output end of the heat recovery device 1. Through the furnace gas circulation, the waste heat in the furnace gas can be continuously transferred to the heat recovery device 1, improving the waste heat recovery efficiency. At the same time, the premium heavy furnace gas scrubbing tower 21 can wash the furnace gas to remove impurities therein, and the condenser 22 can condense the furnace gas to reduce the moisture in the furnace gas.

[0037] A heating water circulation pipeline connected to the heat recovery device 1 for circulating the heating water;

[0038] Among them, the heating water circulation pipeline includes: a cold water bucket 31, a hot water bucket 32, a cold water pump 33, a hot water pump 34, and a water separator 35; the cold water bucket 31 is connected to the water inlet of the heat recovery device 1 through a variable-frequency cold water pump 33, the hot water bucket 32 is connected to the water outlet of the heat recovery device 1, the hot water bucket 32 is connected to the water separator 35 through a hot water pump 34, and the water separator 35 is connected to the heating system.

[0039] Through the heating water circulation, the heat recovered from the furnace gas is transferred to the heating system to achieve heating. The cold water pump 33 adopts variable frequency control, which can adjust the water flow according to actual needs and improve the operating efficiency of the system.

[0040] In summary, in this embodiment, the effective utilization of the waste heat of the furnace gas is realized. The waste heat of the furnace gas is exchanged with the heating water in terms of heat, improving the energy utilization rate and reducing energy waste. Through the design of the furnace gas circulation pipeline, the furnace gas can circulate in the system and fully exchange heat with the heat recovery device 1, improving the efficiency of waste heat recovery. The setting of the heating water circulation pipeline ensures that the heating water can effectively absorb the waste heat of the furnace gas and transfer the heat to the heating system, providing stable heating for the office area, living area and production area, improving the heating conditions, and at the same time avoiding great waste of water resources and energy, and reducing the safety hazards brought by steam heating.

[0041] Optionally, the heating water circulation pipeline further includes:

[0042] A steam pipeline for providing heating steam;

[0043] A heater is connected between the hot water bucket 32 and the water distributor 35. The steam inlet of the heater is connected to the steam pipeline, and the heater is used for secondary heating of the heating water.

[0044] It can be seen that when the temperature of the heating water is insufficient, the heating steam provided by the steam pipeline can be used by the heater to perform secondary heating on the heating water to ensure that the heating water reaches the required temperature and improve the heating effect. It can supplement and heat the heating water output by the hot water bucket 32 to ensure the stable temperature of the heating water output by the water distributor 35 and meet the heating requirements.

[0045] Optionally, the furnace gas circulation pipeline further includes:

[0046] A furnace gas filtering device is connected to the furnace gas circulation pipeline, and the furnace gas filtering device is used for filtering the furnace gas.

[0047] It can be seen that impurities in the furnace gas can be removed, the quality of the furnace gas can be improved, damage to subsequent equipment can be reduced, and at the same time it is also helpful to improve the heat exchange efficiency of the heat recovery device 1.

[0048] Optionally, the furnace gas circulation pipeline further includes:

[0049] A shell and tube heat exchanger is used for condensing the heavy ash waste heat furnace steam to obtain the entrained moisture in the furnace gas, so as to replace the washing water in the superior heavy process.

[0050] It can be seen that the recovery and utilization of the moisture in the furnace gas are realized, the consumption of water resources is reduced, and at the same time the production cost is also reduced.

[0051] Optionally, the furnace gas circulation pipeline further includes:

[0052] An induced draft fan is used to drive the furnace gas to flow in the furnace gas circulation pipeline.

[0053] It can be seen that ensuring the stable circulation of the furnace gas in the system improves the operation stability and reliability of the system.

[0054] Optionally, the circulating water of the condenser 22 is the network water.

[0055] It can be seen that using the network water as the circulating water of the condenser 22 is convenient to obtain and reduces the operation cost of the system.

[0056] Optionally, the heat recovery device 1 is a hybrid heat exchanger.

[0057] It can be seen that the hybrid heat exchanger has the advantages of high heat exchange efficiency and simple structure, and can more effectively realize the heat exchange between the waste heat of the furnace gas and the heating water.

[0058] Optionally, the cold water pump 33 is a variable frequency cold water pump 33.

[0059] It can be seen that the variable frequency cold water pump 33 can adjust the water flow according to the actual needs of the system, realize energy-saving operation, and reduce the energy consumption of the system.

[0060] The following further illustrates a waste heat furnace gas utilization system provided by the present application through another specific embodiment.

[0061] The preparation operations in this embodiment may include:

[0062] 1. Check that all equipment, pipelines, and valves are in good condition.

[0063] 2. Check all electrical appliances, instruments, and operation control points.

[0064] 3. Check whether the equipment safety facilities are complete and in good condition, and whether the post tools are complete.

[0065] 4. Place all valves in the closed state, and all instruments in the manual state.

[0066] 5. Check and confirm that the water, electricity, and gas supplies are complete.

[0067] 6. Clean up the site to make the operation site clean and free of sundries.

[0068] 7. Check whether each lubrication part meets the requirements.

[0069] 8. Confirm that the rotating equipment such as each machine and pump on site can be turned over flexibly, without abnormal phenomena such as jamming, grinding, and miscellaneous noises.

[0070] 9. After confirming that the heating pipe network is qualified for pressure test and leak test, inject water into the barrel to reach the starting liquid level.

[0071] The operation process in this embodiment may include:

[0072] Step 1: Contact the dispatcher to prepare the heating system for startup. Open the soft water makeup valve of the cold water tank 31 and the connecting valve between the cold water tank 31 and the hot water tank 32.

[0073] Step 2: When the liquid levels in the cold water tank 31 and the hot water tank 32 reach 50%, close the makeup valve and start the cold water pump 33. The heating water is sent to the heat recovery unit 1 through the cold water pump 33. During this process, gradually increase the frequency of the cold water pump 33 in a slow manner. After the system operates stably, control the inlet pressure of the heat recovery unit 1 at 0.15 - 0.25 MPa.

[0074] Step 3: Slowly adjust the frequency of the heating induced draft fan by variable frequency. Preferably, slowly open the newly added outlet regulating valve and slowly send the preferably heavy furnace gas into the heat recovery unit 1. In this process, it is required that the general heavy and preferably heavy positions cooperate tacitly. Gradually send the two preferably heavy furnace gases to the heating system. After the operation is stable, stop the original induced draft fan for preferably heavy.

[0075] Step 4: The heating water is heated and raised in temperature in the heat recovery unit 1 (the heating rate should not be greater than 10 °C / h) and then returns to the cold water tank 31. When the temperature in the cold water tank 31 reaches 50 °C, open the vent valve of the newly added condenser 22, and at the same time slowly open the inlet and outlet water valves of the condenser 22. After the air inside the newly added condenser 22 is exhausted, close the vent valve and timely adjust the cooling water consumption of the condenser 22.

[0076] Step 5: When the liquid level in the newly added condenser 22 reaches 30%, open the connecting valve between the condenser 22 and the original general heavy condenser 22 to send liquid.

[0077] Step 6: The heating water in the cold water tank 31 is circulated and heated in the heat recovery unit 1. When the outlet temperature of the heat recovery unit 1 rises to about 65 °C, close the connecting valve between the cold water tank 31 and the hot water tank 32.

[0078] Step 7: The heating water heated to 65 °C returns to the hot water tank 32, and at the same time, soft water is replenished into the cold water tank 31. During this process, control the liquid level in the cold water tank 31 to remain stable (the liquid level is controlled at 70% - 80%).

[0079] Step 8: When the liquid level in the hot water tank 32 reaches 80%, contact the dispatcher to supply water to the heating system, and pay attention to venting the air in each pipeline and radiator.

[0080] Step 9: After receiving the notice from the dispatcher, start the hot water pump 34 to supply a small amount of water to the heating system. As the amount of supplementary cold water increases, increase the system water supply according to the liquid level situation in the hot water tank 32 (the liquid level in the hot water tank 32 is controlled at 70% - 80%). During the whole process, pay attention to maintaining the balance of the liquid level in the tank and avoid large fluctuations.

[0081] Step 10: The heating water returns to the cold water tank 31 after passing through the heating system. After the water supply of the heating system is stable, soft water is appropriately supplemented according to the liquid levels of each tank to ensure the stable operation of the heating system.

[0082] The end operation in this embodiment may include:

[0083] 1. After receiving the dispatching notice, make preparations for parking.

[0084] 2. Switch the automatic control system to the manual state for parking operation.

[0085] 3. Close the furnace gas valve from the general heavy to the heating system, and slowly open the short-circuit regulating valve for the furnace gas to enter the condenser 22.

[0086] 4. Slowly reduce the frequency of the cold water pump 33 until the liquid flow rate on the cold water pump 33 returns to zero.

[0087] 5. After the cold water pump 33 stops, close the outlet valve of the hot water pump 34 and stop the hot water pump 34.

[0088] 6. Open each drain to drain the liquid stored in the system.

[0089] In summary, this embodiment realizes the effective utilization of the waste heat of the furnace gas, exchanges the waste heat of the furnace gas with the heating water, improves the energy utilization rate, and reduces the waste of energy.

[0090] Through the design of the furnace gas circulation pipeline, the furnace gas can circulate in the system, fully exchange heat with the heat recovery device 1, and improve the efficiency of waste heat recovery.

[0091] The setting of the heating water circulation pipeline ensures that the heating water can effectively absorb the waste heat of the furnace gas and transfer the heat to the heating system, providing stable heating for the office area, living area and production area, improving the heating conditions, and at the same time avoiding great waste of water resources and energy, and reducing the safety hazards brought by steam heating.

[0092] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitution or change, and should be covered by the protection scope of the present invention.

Claims

1. A waste heat furnace gas utilization system, characterized in that, Comprising: A heat recovery device for exchanging heat between the waste heat of furnace gas and heating water; A furnace gas circulation pipeline connected to the heat recovery device for circulating furnace gas; A heating water circulation pipeline connected to the heat recovery device for circulating heating water; Wherein, the furnace gas circulation pipeline includes: a heavy-duty furnace gas scrubbing tower and a condenser; the heavy-duty furnace gas scrubbing tower is connected to the input end of the heat recovery device, and the condenser is connected to the output end of the heat recovery device; Wherein, the heating water circulation pipeline includes: a cold water bucket, a hot water bucket, a cold water pump, a hot water pump, and a water distributor; the cold water bucket is connected to the water inlet of the heat recovery device through a variable-frequency cold water pump, the hot water bucket is connected to the water outlet of the heat recovery device, the hot water bucket is connected to the water distributor through a hot water pump, and the water distributor is connected to the heating system.

2. The waste heat furnace gas utilization system according to claim 1, wherein, The heating water circulation pipeline further includes: A steam pipeline for providing heating steam; A heater connected between the hot water bucket and the water distributor, the steam inlet of the heater is connected to the steam pipeline, and the heater is used for secondary heating of the heating water.

3. The waste heat furnace gas utilization system according to claim 1, wherein The furnace gas circulation pipeline further includes: A furnace gas filtering device connected to the furnace gas circulation pipeline, and the furnace gas filtering device is used for filtering the furnace gas.

4. The waste heat furnace gas utilization system according to claim 1, wherein The furnace gas circulation pipeline further includes: A shell-and-tube heat exchanger for condensing the heavy ash waste heat furnace steam to obtain the entrained moisture in the furnace gas for use as a substitute for the washing water in the heavy-duty process.

5. The waste heat furnace gas utilization system according to claim 1, characterized in that The furnace gas circulation pipeline further includes: An induced draft fan for driving the furnace gas to flow in the furnace gas circulation pipeline.

6. The waste heat furnace gas utilization system according to claim 1, characterized in that, The circulating water of the condenser adopts network water.

7. The waste heat furnace gas utilization system according to claim 1, wherein The heat recovery device is a hybrid heat exchanger.

8. The waste heat furnace gas utilization system according to claim 1, characterized in that The cold water pump is a variable-frequency cold water pump.

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