Calcined coke waste heat utilization system

Abstract

The utility model relates to a calcined coke waste heat utilization system, and belongs to the technical field of waste heat recovery. The device comprises a first-stage cooler, a second-stage cooler, a waste heat lifting device and a deaerator, and calcined coke is cooled and output sequentially through the first-stage cooler and the second-stage cooler; the first-stage cooling pipe is communicated with the heating medium pipe to form a circulating pipeline, and external softened water is communicated with a second deoxidizing inlet of the deaerator through a first refrigerant pipe; external softened water is connected with an inlet of the second-stage cooling pipe through a second refrigerant pipe, an outlet of the second-stage cooling pipe communicates with a first inlet of the deaerator, and an outlet of the deaerator conveys high-temperature water to the outside. The system is simple in structure, waste heat of calcined coke can be recycled more sufficiently, energy waste is avoided, steam can be heated by the recycled waste heat of the calcined coke, steam cost is reduced, energy is saved, the system is stable and reliable, calcined coke materials with the temperature below 100 DEG C can be output, and energy is saved. And the discharge temperature of the calcined coke is low, so that the requirement on the cooling temperature of the calcined coke material can be met.

Description

Technical Field

[0001] The utility model relates to a calcined coke waste heat utilization system, belonging to the technical field of waste heat recovery. Background Art

[0002] After drying, petroleum coke is fed into the calcining kiln for high-temperature calcination, which can further graphitize the raw coke. The dried petroleum coke entering the calcining kiln has a low breakage rate, which saves raw materials, has a high yield rate, and naturally high calcination returns. The temperature of the needle coke after calcination is 1200-1400°C and cannot be discharged directly. If it is discharged directly at high temperature, it will damage the equipment and cause a large amount of heat loss. Therefore, cooling measures are needed. Existing methods mostly use calcined coke coolers for cooling and heat exchange. The temperature of the material cooled by the calcined coke cooler is below 100°C and can be directly screened and bagged. Although the calcined coke cooler uses desalted water for indirect heat exchange and waste heat recovery, which greatly saves energy. However, to ensure that the cooled calcined coke material is below 100°C, the cooling water temperature required by the calcined coke cooler must be even lower, generally below 60°C. For the calcined coke cooler, when the cooling water temperature is below a certain level, the requirements for the cooling equipment will be higher, and the calcined coke cooling equipment is prone to instability. Therefore, the existing waste heat recovery of calcined coke is limited, and some waste heat is wasted; in addition, the steam required in the existing plant is generally obtained by burning coal, natural gas, etc., which is relatively costly. Summary of the Invention

[0003] The utility model aims to solve the deficiencies in the prior art and provides a system for utilizing waste heat of calcined coke.

[0004] The utility model solves the above-mentioned technical problems with the following technical solutions: a calcined coke waste heat utilization system, comprising a primary cooler, a secondary cooler, a waste heat lifting device and a deaerator, wherein the calcined coke is cooled and outputted through the primary cooler and the secondary cooler in sequence; the primary cooler is provided with a primary cooling pipe; the secondary cooler is provided with a secondary cooling pipe; the waste heat lifting device comprises a heat medium pipe, a first refrigerant pipe and a second refrigerant pipe; the deaerator comprises a first deaeration inlet, a second deaeration inlet and a deaeration outlet;

[0005] The primary cooling pipe is connected to the heat medium pipe to form a circulation pipeline, the inlet of the first refrigerant pipe is connected to external softened water, the outlet of the first refrigerant pipe is connected to the second deoxygenation inlet of the deaerator to transport high-temperature water or steam to the deaerator, or the outlet of the first refrigerant pipe transports high-temperature water or steam to the outside;

[0006] The inlet of the second refrigerant pipe is connected to external softened water, the outlet of the second refrigerant pipe is connected to the inlet of the secondary cooling pipe, the outlet of the secondary cooling pipe is connected to the first inlet of the deaerator, and the outlet of the deaerator transports high-temperature water to the outside.

[0007] The beneficial effects of the utility model are as follows: the calcined coke waste heat utilization system has a simple structure, which not only more fully recycles and utilizes the waste heat of the calcined coke to avoid energy waste, but also utilizes the recovered waste heat of the calcined coke to heat steam, thereby reducing steam costs and saving energy. The system is stable and reliable, and can output calcined coke materials below 100°C. The low discharge temperature of the calcined coke can meet the cooling temperature requirements of the calcined coke materials.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, the external softened water is connected to the inlet of the second refrigerant pipe through a supply pipeline, and a supply water pump is provided on the supply pipeline.

[0010] The beneficial effect of adopting the above further solution is that, under the action of the supply water pump, external softened water can flow into the second refrigerant pipe and the secondary cooling pipe to exchange heat and obtain high-temperature water.

[0011] Furthermore, a circulating water pump is provided on the circulating pipeline.

[0012] The beneficial effect of adopting the above further solution is that the circulating water pump ensures the flow of the circulating medium inside the circulating pipeline.

[0013] Furthermore, the circulating medium in the circulating pipeline is water or thermal oil.

[0014] The beneficial effect of adopting the above further scheme is that there is a circulating medium in the circulating pipeline, and the circulating medium can exchange heat with the calcined coke, and can also exchange heat with the medium in the first refrigerant pipe in the waste heat lifting device. As for the circulating pipeline, a suitable circulating medium can be selected according to actual needs to meet system requirements.

[0015] Furthermore, the waste heat lifting device is a second-type absorption heat pump, a centrifugal heat pump or a water vapor compressor.

[0016] The beneficial effect of adopting the above-mentioned further scheme is that a suitable waste heat lifting device can be selected according to actual needs. For example, a second-type absorption heat pump can be selected to obtain high-temperature hot water or steam with a higher temperature than the heat source. The steam can enter the deaerator, and the water entering the deaerator can be heated by the steam, thereby producing deoxygenated water that enters the boiler to replenish the boiler water. The waste heat recovered from the calcined coke is used to heat the steam, thereby reducing the steam cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] In the figure, 1, primary cooling pipe; 2, secondary cooling pipe; 3, heat medium pipe; 4, first refrigerant pipe; 5, second refrigerant pipe; 6, circulating water pump; 7, supply water pump. DETAILED DESCRIPTION

[0019] The principles and features of the present invention are described below with reference to examples. The examples are only used to explain the present invention and are not used to limit the scope of the present invention.

[0020] like Figure 1 As shown, a calcined coke waste heat utilization system includes a primary cooler, a secondary cooler, a waste heat lifting device and a deaerator. The calcined coke is cooled and output through the primary cooler and the secondary cooler in sequence, and the output material can be below 100°C.

[0021] The primary cooler is provided with a primary cooling pipe 1; the secondary cooler is provided with a secondary cooling pipe 2; the waste heat lifting device includes a heat medium pipe 3, a first refrigerant pipe 4 and a second refrigerant pipe 5, and the deaerator includes a first deaeration inlet, a second deaeration inlet and a deaeration outlet;

[0022] The primary cooling pipe 1 is connected to the heat medium pipe 3 to form a circulation pipeline. The inlet of the first refrigerant pipe 4 is connected to external softened water. The outlet of the first refrigerant pipe 4 is connected to the second deaerator inlet of the deaerator to transport high-temperature water or steam to the deaerator, or the outlet of the first refrigerant pipe 4 transports high-temperature water or steam to the outside.

[0023] The inlet of the second refrigerant pipe 5 is connected to external softened water, the outlet of the second refrigerant pipe 5 is connected to the inlet of the secondary cooling pipe 2, the outlet of the secondary cooling pipe 2 is connected to the first inlet of the deaerator, and the outlet of the deaerator transports high-temperature water to the outside.

[0024] The external softened water is connected to the inlet of the second refrigerant pipe 5 through the supply pipeline, and the supply pipeline is provided with a supply water pump 7. Under the action of the supply water pump 7, the external softened water can flow into the second refrigerant pipe 5 and the secondary cooling pipe 2 to exchange heat and obtain high-temperature water.

[0025] The circulating pipeline is provided with a circulating water pump 6. The circulating water pump 6 ensures the flow of the circulating medium inside the circulating pipeline.

[0026] The circulating medium in the circulation pipeline is water or thermal oil. The circulating medium in the circulation pipeline can exchange heat with the calcined coke and with the medium in the first refrigerant pipe 4 of the waste heat lifting device. The appropriate circulating medium can be selected based on actual needs to meet system requirements.

[0027] The waste heat lifting device is a Class II absorption heat pump, a centrifugal heat pump, or a steam compressor. The appropriate waste heat lifting device can be selected based on actual needs. For example, a Class II absorption heat pump can generate hot water or steam at a higher temperature than the heat source. The steam can then enter the deaerator, where it is heated by the steam, producing deoxygenated water that is then fed into the boiler for boiler replenishment. This utilizes the waste heat recovered from the calcined coke to heat the steam, reducing steam costs.

[0028] Taking the cooling of 22t / h forged coke as an example, the forged coke material at 1050℃ is cooled to below 100℃ and passes through the primary cooler and the secondary cooler respectively;

[0029] The temperature of the hot water exchanged by the primary cooler and the secondary cooler is recommended to be below 140°C. If it is too high, it will affect the stability of the system. Therefore, the primary cooler is considered to circulate at 110-140°C. The 110°C hot water passes through the primary cooler and is heated to 140°C. The calcined coke material is cooled to 650°C. The 140°C hot water enters the waste heat lifting device through the circulating water pump 6 and is cooled to 110°C, completing the cycle.

[0030] 25°C softened water first passes through a waste heat lifting device, then enters a secondary cooler. It is then heated by the 650°C calcined coke to 140°C before entering the deaerator, where the calcined coke is cooled to below 100°C. The 140°C softened water entering the deaerator is then heated by 165°C saturated steam, ultimately producing 156°C deoxygenated water that enters the boiler as feed water. This system fully recycles the waste heat from the calcined coke, not only reducing the cooling temperature of the calcined coke, but also reducing the high steam costs required for the plant. The comprehensive utilization of waste heat significantly saves energy and avoids resource waste.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A calcined coke waste heat utilization system, characterized in that: It includes a primary cooler, a secondary cooler, a waste heat lifting device and a deaerator. The calcined coke is cooled and output through the primary cooler and the secondary cooler in sequence. The first-stage cooler is provided with a first-stage cooling pipe (1); the second-stage cooler is provided with a second-stage cooling pipe (2); the waste heat lifting device includes a heat medium pipe (3), a first refrigerant pipe (4) and a second refrigerant pipe (5); the deaerator includes a first deaeration inlet, a second deaeration inlet and a deaeration outlet; The primary cooling pipe (1) is connected to the heat medium pipe (3) to form a circulation pipeline, the inlet of the first refrigerant pipe (4) is connected to external softened water, the outlet of the first refrigerant pipe (4) is connected to the second deoxygenation inlet of the deaerator to transport high-temperature water or steam to the deaerator, or the outlet of the first refrigerant pipe (4) transports high-temperature water or steam to the outside; The inlet of the second refrigerant pipe (5) is connected to external softened water, the outlet of the second refrigerant pipe (5) is connected to the inlet of the secondary cooling pipe (2), the outlet of the secondary cooling pipe (2) is connected to the first inlet of the deaerator, and the outlet of the deaerator transports high-temperature water to the outside.

2. The calcined coke waste heat utilization system according to claim 1, characterized in that: The external softened water is connected to the inlet of the second refrigerant pipe (5) through a supply pipeline, and a supply water pump (7) is provided on the supply pipeline.

3. The calcined coke waste heat utilization system according to claim 1 or 2, characterized in that: A circulating water pump (6) is provided on the circulating pipeline.

4. The calcined coke waste heat utilization system according to claim 1, characterized in that: The circulating medium in the circulating pipeline is water or heat transfer oil.

5. The calcined coke waste heat utilization system according to claim 1 or 2, characterized in that: The waste heat lifting device is a second-type absorption heat pump, a centrifugal heat pump or a water vapor compressor.

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