Cement kiln waste heat power generation system integrated with vacuum system

Abstract

The utility model discloses a cement kiln waste heat power generation system of integrated vacuum system, including waste heat boiler, steam turbine, generator, vacuum system and condensate system, condensate system includes the condenser, condensate pump, low pressure heater, deaerator, feed water pump, high pressure heater, economizer that connect gradually, and the output of economizer is connected in the feed water inlet of waste heat boiler, vacuum system includes vacuum equipment, first vacuum pipeline, second vacuum pipeline, cooling device, flash evaporator and heat exchanger, so, through the condenser and deaerator vacuum pipeline are combined, maintain two places vacuum through single set vacuum equipment simultaneously, reduce equipment operation and maintenance cost, second is that vacuum gas condenses after entering flash evaporator through cooling device, and liquid phase high temperature condensate water heats condensate water through heat exchanger, and the originally wasted heat is used to promote deaerator water temperature, reduces deaerator heating steam consumption.

Description

Technical Field

[0001] This utility model relates to the technology of waste heat power generation in cement kilns, and in particular to a waste heat power generation system for cement kilns with an integrated vacuum system. Background Technology

[0002] The waste heat power generation technology of cement kilns directly recovers the waste heat exhaust gas emitted from the kiln head and kiln tail during the clinker calcination process of cement kilns, and generates steam through a waste heat boiler to drive a steam turbine generator to generate electricity.

[0003] In cement kiln waste heat power generation projects, two vacuum systems are often installed: one for the condenser to establish and maintain condenser vacuum, and the other for the deaerator to establish and maintain deaerator vacuum. The configurations of the two vacuum systems are basically the same, with only slight differences in installed power based on the load. Of course, the energy consumption of operating two vacuum systems is also relatively high, the overall structure is slightly more complex, the pipeline layout is relatively cumbersome, and they occupy a large amount of space.

[0004] Secondly, the gas discharged during the vacuuming process carries steam heat. Traditional systems directly discharge or simply cool it, failing to effectively utilize this waste heat. This results in additional steam consumption for condensate heating, reducing the system's thermal efficiency.

[0005] Furthermore, when the condensate in the condenser is heated through multiple stages, some of the low-temperature condensate returns to the system without sufficient heat exchange, resulting in heat waste; when the inlet water temperature of the deaerator is insufficient, it is necessary to rely on additional steam heating, which increases energy consumption.

[0006] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0007] In view of this, the present invention addresses the deficiencies of the existing technology, and its main objective is to provide a cement kiln waste heat power generation system with an integrated vacuum system. This system combines the vacuum pipelines of the condenser and deaerator, maintaining vacuum at both locations simultaneously with a single vacuum device, reducing equipment investment and maintenance costs, and improving system reliability. Secondly, the vacuum gas is condensed by a cooling device and then enters the flash evaporator. The high-temperature liquid condensate is heated by a heat exchanger, using the previously wasted heat to increase the deaerator inlet water temperature, reducing deaerator heating steam consumption. Furthermore, the condensate from the low-pressure heater outlet is reheated by a heat exchanger before entering the deaerator, reducing the deaerator's dependence on auxiliary steam and simultaneously reducing the load on the high-pressure heater, thus extending equipment lifespan.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A cement kiln waste heat power generation system with an integrated vacuum system includes a waste heat boiler, a steam turbine, a generator, a condenser, a vacuum system, and a condensate system; the steam turbine and the generator are coaxially connected, the main steam outlet of the waste heat boiler is connected to the steam inlet of the steam turbine, and the exhaust outlet of the steam turbine is connected to the steam inlet of the condenser.

[0010] The condensate system includes a condenser, a condensate pump, a low-pressure heater, a deaerator, a feedwater pump, a high-pressure heater, and an economizer connected in sequence. The output end of the economizer is connected to the feedwater inlet of the waste heat boiler.

[0011] The vacuum system includes vacuum equipment, a first vacuum pipeline, a second vacuum pipeline, a cooling device, a flash evaporator, and a heat exchanger.

[0012] The first vacuum line is connected to the vacuum port of the condenser, the second vacuum line is connected to the vacuum port of the deaerator, the first vacuum line and the second vacuum line converge and are connected to the inlet of the cooling device, the outlet of the cooling device is connected to the inlet of the flash evaporator, the gas phase outlet of the flash evaporator is connected to the vacuum equipment, and the liquid phase outlet of the flash evaporator is connected to the first side inlet of the heat exchanger.

[0013] The first outlet of the heat exchanger is connected to the hot water well of the condenser, the second inlet is connected to the outlet of the low-pressure heater, and the second outlet of the heat exchanger is connected to the inlet of the deaerator.

[0014] As a preferred embodiment, the drain outlet of the economizer is connected to the drain inlet of the high-pressure heater.

[0015] As a preferred embodiment, the condensate outlet of the high-pressure heater is connected to a deaerator.

[0016] As a preferred embodiment, the condensate outlet of the low-pressure heater is connected to the hot water well of the condenser.

[0017] As a preferred embodiment, the flash evaporator and the heat exchanger are connected by a sealed flange.

[0018] As a preferred embodiment, the first and second vacuum lines are covered with heat insulation components to reduce heat loss.

[0019] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly combines the vacuum pipelines of the condenser and the deaerator, and maintains the vacuum at both locations simultaneously with a single set of vacuum equipment, thereby reducing equipment investment and operation and maintenance costs and improving system reliability.

[0020] Secondly, the vacuum gas is condensed by the cooling device and then enters the flash evaporator. The high-temperature liquid condensate is heated by the heat exchanger, which uses the heat that would otherwise be wasted to increase the inlet water temperature of the deaerator and reduce the consumption of heating steam in the deaerator.

[0021] Furthermore, the condensate from the low-pressure heater outlet is reheated by a heat exchanger before entering the deaerator, reducing the deaerator's dependence on auxiliary steam and simultaneously reducing the load on the high-pressure heater, thus extending the equipment's lifespan.

[0022] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0024] Explanation of reference numerals in the attached diagram:

[0025] 1. Waste heat boiler 2. Steam turbine

[0026] 3. Generator 4. Vacuum system

[0027] 5. Condensate system

[0028] 51. Condenser 52. Condensate pump

[0029] 53. Low-pressure heater 54. Deaerator

[0030] 55. Water pump 56. High-pressure heater

[0031] 57. Economizer

[0032] 41. Vacuum pumping equipment 42. First vacuum pumping pipeline

[0033] 43. Second vacuum line 44. Cooling device

[0034] 45. Flash evaporator 46. Heat exchanger. Detailed Implementation

[0035] Please refer to Figure 1 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0036] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0037] A cement kiln waste heat power generation system with an integrated vacuum system includes a waste heat boiler 1, a steam turbine 2, a generator 3, a condenser 51, a vacuum system 4, and a condensate system 5.

[0038] The steam turbine 2 is coaxially connected to the generator 3, the main steam outlet of the waste heat boiler 1 is connected to the steam inlet of the steam turbine 2, and the exhaust port of the steam turbine 2 is connected to the steam inlet of the condenser 51.

[0039] The condensate system 5 includes a condenser 51, a condensate pump 52, a low-pressure heater 53, a deaerator 54, a feedwater pump 55, a high-pressure heater 56, and an economizer 57 connected in sequence. The output end of the economizer 57 is connected to the feedwater inlet of the waste heat boiler 1. The hot water well of the condenser 51 is the starting point of the condensate system 5. The low-pressure heater 53 is used to heat the condensate using steam extracted from the turbine 2. The condenser 51 receives the exhaust steam from the turbine 2 and condenses it into water. The steam inlet of the turbine 2 comes from the main steam pipe of the waste heat boiler 1, and its exhaust steam is connected to the condenser 51. The water-side inlet of the low-pressure heater 53 receives the condensate from the condenser 51 (through the condensate pump 52), and the water-side outlet connects to the next-stage low-pressure heater 53 or the deaerator 54. The steam-side inlet connects to the low-pressure extracted steam from the turbine 2, and the steam-side outlet (drainage) usually flows into the next-stage low-pressure heater 53 or the condenser 51.

[0040] The vacuum system 4 includes a vacuum pumping device 41, a first vacuum pumping pipeline 42, a second vacuum pumping pipeline 43, a cooling device 44, a flash evaporator 45, and a heat exchanger 46.

[0041] The first vacuum line 42 is connected to the vacuum port of the condenser 51, and the second vacuum line 43 is connected to the vacuum port of the deaerator 54. The first vacuum line 42 and the second vacuum line converge and are connected to the inlet of the cooling device 44. Preferably, the first vacuum line 42 and the second vacuum line 43 are covered with heat insulation materials to reduce heat loss.

[0042] The vacuum pumping device 41 includes a water jet pump, a water jet tank, and a water jet pump. The inlet of the water jet pump is connected to the water jet tank via a pipeline, the outlet of the water jet pump is connected to the liquid phase inlet of the water jet pump via a pipeline, the outlet of the water jet pump is connected to the water jet tank via a pipeline, and the gas phase inlet of the water jet pump constitutes the inlet of the vacuum pumping device 41.

[0043] When the vacuum pumping device 41 is activated, it opens the vacuum port of the condenser 51 and the vacuum port of the deaerator 54. The gas inside the condenser 51 and the deaerator 54 is drawn away by the vacuum pumping device 41. The entire system uses one set of vacuum pumping device 41. The vacuuming requirements of the condenser 51 and the deaerator 54 are met through the arrangement of pipelines. The overall structure design is simple and reasonable. It optimizes and integrates the vacuum system 4 of the condenser 51 and the deaerator 54 in the existing waste heat power generation system. The vacuuming requirements can be met by using one vacuum system 4.

[0044] A first valve is provided on the first vacuum line 42, and a second valve is provided on the second vacuum line 43. The first valve allows for flexible control of the opening and closing of the first vacuum line 42 and its flow rate. Similarly, the second valve allows for flexible control of the opening and closing of the second vacuum line 43 and its flow rate, facilitating the efficient extraction of gas from the condenser and deaerator 54. A fourth valve and a fifth valve are respectively provided at the vacuum ports of the condenser 51 and deaerator 54. These valves allow for flexible control of the flow at the vacuum ports of the condenser 51 and deaerator 54, making operation more convenient.

[0045] The outlet of the cooling device 44 is connected to the inlet of the flash evaporator 45, the gas phase outlet of the flash evaporator 45 is connected to the vacuum pumping device 41, and the liquid phase outlet of the flash evaporator 45 is connected to the first side inlet of the heat exchanger 46.

[0046] The first outlet of the heat exchanger 46 is connected to the hot water well of the condenser 51, the second inlet is connected to the outlet of the low-pressure heater 53, and the second outlet of the heat exchanger 46 is connected to the inlet of the deaerator 54.

[0047] Preferably, the drain outlet of the economizer 57 is connected to the drain inlet of the high-pressure heater 56. Preferably, the drain outlet of the high-pressure heater 56 is connected to the deaerator 54. Preferably, the drain outlet of the low-pressure heater 53 is connected to the hot water well of the condenser 51. Preferably, the flash evaporator 45 and the heat exchanger 46 are sealed together by a sealing flange.

[0048] The key design feature of this utility model is that it combines the vacuum pipelines of the condenser and the deaerator, and maintains a vacuum in both locations simultaneously with a single set of vacuum equipment, thereby reducing equipment investment and maintenance costs and improving system reliability.

[0049] Secondly, the vacuum gas is condensed by the cooling device and then enters the flash evaporator. The high-temperature liquid condensate is heated by the heat exchanger, which uses the heat that would otherwise be wasted to increase the inlet water temperature of the deaerator and reduce the consumption of heating steam in the deaerator.

[0050] Furthermore, the condensate from the low-pressure heater outlet is reheated by a heat exchanger before entering the deaerator, reducing the deaerator's dependence on auxiliary steam and simultaneously reducing the load on the high-pressure heater, thus extending the equipment's lifespan.

[0051] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A cement kiln waste heat power generation system with an integrated vacuum system, characterized in that, It includes a waste heat boiler, a steam turbine, a generator, a vacuum system, and a condensate system; the steam turbine and the generator are coaxially connected, the main steam outlet of the waste heat boiler is connected to the steam inlet of the steam turbine, and the exhaust outlet of the steam turbine is connected to the steam inlet of the condenser; The condensate system includes a condenser, a condensate pump, a low-pressure heater, a deaerator, a feedwater pump, a high-pressure heater, and an economizer connected in sequence. The output end of the economizer is connected to the feedwater inlet of the waste heat boiler. The vacuum system includes vacuum equipment, a first vacuum pipeline, a second vacuum pipeline, a cooling device, a flash evaporator, and a heat exchanger. The first vacuum line is connected to the vacuum port of the condenser, the second vacuum line is connected to the vacuum port of the deaerator, the first vacuum line and the second vacuum line converge and are connected to the inlet of the cooling device, the outlet of the cooling device is connected to the inlet of the flash evaporator, the gas phase outlet of the flash evaporator is connected to the vacuum equipment, and the liquid phase outlet of the flash evaporator is connected to the first side inlet of the heat exchanger. The first outlet of the heat exchanger is connected to the hot water well of the condenser, the second inlet is connected to the outlet of the low-pressure heater, and the second outlet of the heat exchanger is connected to the inlet of the deaerator.

2. The cement kiln waste heat power generation system with integrated vacuum system according to claim 1, characterized in that: The economizer's drain outlet is connected to the high-pressure heater's drain inlet.

3. The cement kiln waste heat power generation system with integrated vacuum system according to claim 2, characterized in that: The high-pressure heater's condensate outlet is connected to a deaerator.

4. The cement kiln waste heat power generation system with integrated vacuum system according to claim 3, characterized in that: The condensate outlet of the low-pressure heater is connected to the hot water well of the condenser.

5. The cement kiln waste heat power generation system with integrated vacuum system according to claim 1, characterized in that: The flash evaporator and the heat exchanger are connected by a sealed flange.

6. The cement kiln waste heat power generation system with integrated vacuum system according to claim 1, characterized in that: The first and second vacuum lines are covered with heat insulation components to reduce heat loss.

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