Comprehensive regenerative energy-saving system for steam turbine flue gas and dead steam

Abstract

The utility model provides a steam turbine flue gas and dead steam comprehensive heat regeneration energy-saving system, and relates to the technical field of waste heat recovery, the steam turbine flue gas and dead steam comprehensive heat regeneration energy-saving system comprises a boiler main body, the boiler main body is connected with a steam turbine main body, the steam turbine main body is connected with a condenser and a dead steam waste heat recovery part, and a flue gas waste heat recovery part is connected between the boiler main body and the condenser; the flue gas waste heat recovery part is used for recovering flue gas waste heat so as to realize primary heating of condensed water, and the dead steam waste heat recovery part is used for recovering dead steam waste heat so as to realize secondary heating of the condensed water. According to the system, two waste heat resources of the power plant are recycled to the maximum extent in a manner of recycling the flue gas waste heat and the dead steam waste heat in a grading manner, specifically, the flue gas waste heat recycling part is used for performing primary heating on low-temperature condensed water, then the dead steam waste heat recycling part is used for performing secondary heating on the condensed water, and the waste heat recycling part is used for performing secondary heating on the condensed water; finally, the condensed water is heated to a high temperature and used for a water supply system of a power plant, and the waste heat recovery efficiency is improved through the gradient utilization mode.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat recovery technical field, specifically, relate to a steam engine flue gas exhaust steam comprehensive heat recovery energy -conserving system. BACKGROUND

[0002] In the process of power plant operation, flue gas waste heat and steam engine exhaust steam waste heat are two biggest heat waste subsystems. These waste heat resources account for a large proportion, and have higher recycling value, but due to technical limitations, its recycling rate is not high;

[0003] Specifically, flue gas waste heat and steam engine exhaust steam exist close temperature zone objective phenomenon, which leads to single recovery technology in the prior art, for example, in the heating season, flue gas waste heat recovery heating technology and steam engine exhaust steam recovery heating technology are used, but in the non-heating season, the recovery of these waste heat is insufficient or limited to single recovery mode, and the waste heat resources cannot be fully utilized. Therefore, we improve it and propose a steam engine flue gas exhaust steam comprehensive heat recovery energy -conserving system. SUMMARY

[0004] The utility model discloses the purpose at: in view of the existing problem of the recovery of waste heat in the non-heating season, which is insufficient or limited to single recovery mode, and the waste heat resources cannot be fully utilized.

[0005] In order to realize the above-mentioned invention purpose, the utility model provides a steam engine flue gas exhaust steam comprehensive heat recovery energy -conserving system to improve the above-mentioned problem.

[0006] The application is as follows:

[0007] A steam engine flue gas exhaust steam comprehensive heat recovery energy -conserving system, including the boiler main part, the boiler main part is connected with the steam engine main part, the steam engine main part is connected with condenser and exhaust steam waste heat recovery unit, the boiler main part is connected with the condenser and is connected with flue gas waste heat recovery unit, and flue gas waste heat recovery unit is used for the recovery of flue gas waste heat, to realize the first stage heating of condensate, and exhaust steam waste heat recovery unit is used for the recovery of exhaust steam waste heat, to realize the second stage heating of condensate.

[0008] As the preferred technical scheme of the application, the exhaust steam waste heat recovery unit includes an exhaust steam recovery steam heat pump, which is connected with the steam engine main body.

[0009] As the preferred technical scheme of the application, the exhaust steam recovery steam heat pump is connected with a heat pump heater, and the heat pump heater is connected with a hot water conveying piece between the boiler main body.

[0010] As the preferred technical scheme of the application, the hot water conveying piece includes a feed water heater connected with the heat pump heater, the feed water heater is connected with a feed water pump, and the feed water pump is connected with the boiler main body.

[0011] As the preferred technical scheme of the present application, the feedwater heater is used for reheating the condensate water before entering the main body of the boiler, and the feedwater pump is used for providing conveying power for the condensate water entering the main body of the boiler.

[0012] As the preferred technical scheme of the present application, the flue gas waste heat recovery part comprises a flue gas waste heat recovery heater connected with the main body of the boiler.

[0013] As the preferred technical scheme of the present application, the flue gas waste heat recovery heater is connected with a condensate water pump, the condensate water pump is connected with a condensate water tank, and the condensate water tank is connected with a condenser.

[0014] As the preferred technical scheme of the present application, the flue gas waste heat recovery heater is also connected with a heat pump heater.

[0015] As the preferred technical scheme of the present application, the flue gas waste heat recovery heater is connected with a chimney for high-altitude emission of flue gas.

[0016] As the preferred technical scheme of the present application, the flue gas waste heat recovery heater is used for realizing heat exchange between flue gas and condensate water of the main body of the boiler, so as to heat the condensate water.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] In the scheme of the present application:

[0019] In order to solve the problem that in the prior art, the recovery of waste heat is insufficient or limited to a single recovery mode in the non-heating season, and the waste heat resources cannot be fully utilized, the present application realizes the maximum recovery of two waste heat resources of the power plant by the way of grading recovery of flue gas waste heat and exhaust steam waste heat, specifically, the system first heats the low-temperature condensate water by the flue gas waste heat recovery part, then heats the condensate water by the exhaust steam waste heat recovery part, and finally heats the condensate water to a higher temperature for the feedwater system of the power plant. This gradient utilization method not only improves the waste heat recovery efficiency, but also realizes the maximum utilization of waste heat, and significantly improves the energy saving and consumption reduction benefit of the power plant. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application provides a schematic diagram of a steam turbine flue gas and exhaust steam comprehensive heat recovery energy-saving system;

[0021] Figure 2 The present application provides a schematic diagram of an exhaust steam waste heat recovery part of a steam turbine flue gas and exhaust steam comprehensive heat recovery energy-saving system;

[0022] Figure 3The figure shows a schematic diagram of a flue gas waste heat recovery part of a steam turbine flue gas and exhaust steam comprehensive heat recovery energy saving system provided by the present application.

[0023] The figure shows:

[0024] 1, boiler main body; 2, steam turbine main body; 3, condenser; 4, exhaust steam recovery jet heat pump; 5, heat pump heater; 6, condensate tank; 7, condensate pump; 8, flue gas waste heat recovery heater; 9, chimney; 10, feedwater heater; 11, feedwater pump. DETAILED DESCRIPTION

[0025] In order to make the person skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.

[0026] As described in the background, the flue gas waste heat and the exhaust steam of the steam turbine have the objective phenomenon of close temperature zones, which leads to the single recovery technology in the prior art, for example, in the heating season, the flue gas waste heat recovery heating technology and the exhaust steam recovery heating technology of the steam turbine are used, but in the non-heating season, the recovery of these waste heat is insufficient or limited to single recovery mode, and the waste heat resources cannot be fully utilized

[0027] In order to solve this technical problem, the present application provides a steam turbine flue gas and exhaust steam comprehensive heat recovery energy saving system.

[0028] Specifically, please refer to Figures 1-3 The steam turbine flue gas and exhaust steam comprehensive heat recovery energy saving system specifically comprises:

[0029] The boiler main body 1 is connected with the steam turbine main body 2, the steam turbine main body 2 is connected with the condenser 3 and the exhaust steam waste heat recovery part, the flue gas waste heat recovery part is connected between the boiler main body 1 and the condenser 3, the flue gas waste heat recovery part is used for recovering the flue gas waste heat to realize the first heating of the condensate, and the exhaust steam waste heat recovery part is used for recovering the exhaust steam waste heat to realize the second heating of the condensate.

[0030] The steam engine flue gas and exhaust steam comprehensive heat recovery energy-saving system provided by the utility model, through the mode of hierarchical recovery of flue gas waste heat and exhaust steam waste heat, the maximization recovery of two waste heat resources of the power plant is realized, specifically, the system uses the flue gas waste heat recovery part to first heat the low-temperature condensed water in one stage, then uses the exhaust steam waste heat recovery part to heat the condensed water in two stages, and finally heats the condensed water to a higher temperature, which is used for the feedwater system of the power plant, the hierarchical utilization mode not only improves the waste heat recovery efficiency, but also realizes the maximization utilization of waste heat, and significantly improves the energy-saving and consumption-reducing benefits of the power plant.

[0031] In order for those skilled in the art to better understand the technical scheme of the utility model, the technical scheme in the utility model embodiment will be clearly and completely described below in combination with the drawings.

[0032] It should be noted that the embodiments in the utility model and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0033] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0034] Embodiment 1, please refer to Figures 1-3 A steam engine flue gas and exhaust steam comprehensive heat recovery energy-saving system, comprising a boiler main body 1, the boiler main body 1 is connected with a steam engine main body 2, the steam engine main body 2 is connected with a condenser 3 and an exhaust steam waste heat recovery part, the boiler main body 1 and the condenser 3 are connected with a flue gas waste heat recovery part, the flue gas waste heat recovery part is used for the recovery of flue gas waste heat, so as to realize the first-stage heating of condensed water, the exhaust steam waste heat recovery part is used for the recovery of exhaust steam waste heat, so as to realize the second-stage heating of condensed water, the condenser 3 is a cooling equipment for condensing the exhaust steam of the steam engine main body 2, and is a main equipment of the steam engine main body 2 back pressure maintaining system.

[0035] Embodiment 2, the steam engine flue gas and exhaust steam comprehensive heat recovery energy-saving system provided in embodiment 1 is further optimized, specifically, Figure 1 and Figure 2 As shown in the drawings, the exhaust steam waste heat recovery part comprises an exhaust steam recovery steam heat pump 4, the exhaust steam recovery steam heat pump 4 is connected with the steam engine main body 2, the exhaust steam recovery steam heat pump 4 plays a very key role in the whole system, the exhaust steam recovery steam heat pump 4 is connected with the steam engine main body 2, so that the exhaust steam recovery steam heat pump 4 can capture the exhaust steam generated in the operation process of the steam engine main body 2 in the first time, and the exhaust steam recovery steam heat pump 4 is a low-back-pressure steam heat pump.

[0036] Further, the exhaust steam recovery steam heat pump 4 is connected with a heat pump heater 5, and a hot water conveying element is connected between the heat pump heater 5 and the boiler body 1, and the heat pump heater 5, the hot water conveying element and the exhaust steam recovery steam heat pump 4 form a complete energy transmission link, the heat pump heater 5 serves as an intermediate link to effectively integrate and convert the energy recovered by the exhaust steam recovery steam heat pump 4, and the converted energy is stably conveyed to the boiler body 1 in the form of hot water through the hot water conveying element, and the design ensures that the energy recovered from the exhaust steam can be reasonably utilized, and the loss of energy in the transmission and conversion process is avoided.

[0037] Further, as shown in Figure 1 and Figure 2 , the hot water conveying element comprises a feed water heater 10 connected with the heat pump heater 5, and the feed water heater 10 is connected with a feed water pump 11 connected with the boiler body 1, and the feed water heater 10 reheats the condensed water before the condensed water enters the boiler body 1, and the temperature of the heated condensed water is increased, and when the condensed water enters the boiler body 1, the amount of fuel consumed by the boiler body 1 is correspondingly reduced, because the feed water heater 10 increases the initial temperature of the water entering the boiler body 1, reduces the energy and time required for the boiler body 1 to heat the water to the working temperature, maintains the stability of the heat exchange process inside the boiler body 1, and ensures the stable operation of the boiler body 1.

[0038] Further, the feed water heater 10 is used for reheating the condensed water before it enters the boiler body 1, and the feed water pump 11 is used to provide conveying power for the condensed water entering the boiler body 1.

[0039] In embodiment 3, the steam turbine flue gas exhaust steam comprehensive heat recovery energy-saving system provided in embodiment 1 or 2 is further optimized, and specifically, as shown in Figure 1 and Figure 3 , the flue gas waste heat recovery part comprises a flue gas waste heat recovery heater 8 connected with the boiler body 1, and the setting of the flue gas waste heat recovery heater 8 is an important measure to improve the energy utilization efficiency of the whole system, and a large amount of high-temperature flue gas will be generated during the operation of the boiler body 1, and the flue gas contains rich heat energy, and the flue gas waste heat recovery heater 8 can effectively utilize the waste heat in the high-temperature flue gas to heat the condensed water.

[0040] Further, as shown in Figure 1 , the flue gas waste heat recovery heater 8 is connected with a condensed water pump 7, the condensed water pump 7 is connected with a condensed water tank 6, the condensed water tank 6 is connected with the condenser 3, and the condensed water tank 6 is used to collect and store the condensed water generated by the condenser 3, and the condensed water pump 7 is used to ensure that the condensed water can be stably conveyed from the condensed water tank 6 to the flue gas waste heat recovery heater 8.

[0041] Further, asFigure 1 As shown, the flue gas waste heat recovery heater 8 is also connected with the heat pump heater 5, so that the condensed water heated by the flue gas waste heat recovery heater 8 can be transported to the heat pump heater 5 for secondary heating.

[0042] Further, as shown in the figure, Figure 1 As shown, the flue gas waste heat recovery heater 8 is connected with a chimney 9, and the chimney 9 is used for high-altitude emission of flue gas.

[0043] Further, the flue gas waste heat recovery heater 8 is used to realize heat exchange between the flue gas of the boiler main body 1 and the condensed water, so as to realize heating of the condensed water, and the waste heat contained in the flue gas is fully utilized to heat the condensed water. The condensed water originally needing to consume additional energy for heating can now obtain heat through the flue gas waste heat recovery heater 8, thereby improving the temperature of the condensed water. This process reduces the need for external energy acquisition for heating the condensed water, thereby reducing the energy consumption of the entire system.

[0044] The use process of the steam turbine flue gas exhaust steam comprehensive heat recovery energy-saving system is as follows:

[0045] Firstly, the high-temperature and high-pressure steam generated by the boiler main body 1 enters the steam turbine main body 2, pushes the steam turbine main body 2 to rotate and generates electric power. In the steam turbine main body 2, the steam gradually cools and depressurizes, and releases part of the energy. In this process, the condensed water generated by the condenser 3 flows to the condensed water tank 6, and the condensed water in the condensed water tank 6 is transported to the flue gas waste heat recovery heater 8 by the condensed water pump 7. The flue gas waste heat recovery heater 8 exchanges heat between the flue gas discharged by the boiler main body 1 and the condensed water, so as to heat the condensed water, realize the first recovery of the flue gas waste heat, and transport the heated condensed water to the heat pump heater 5.

[0046] The exhaust steam heat pump 4 is used to recover the exhaust steam of the steam turbine main body 2. The exhaust steam heat pump 4 mixes and increases the temperature and pressure of the low-pressure exhaust steam to steam above 100°C through medium-high pressure working steam, so as to provide a heat source for the heat pump heater 5. When the condensed water heated by the flue gas waste heat recovery heater 8 reaches the heat pump heater 5, the heat pump heater 5 exchanges heat between the steam recovered and heated by the exhaust steam heat pump 4 and the condensed water heated by the flue gas waste heat recovery heater 8, so as to realize reheating and temperature rising of the condensed water. The condensed water heated twice reaches the feed water heater 10, is heated again by the feed water heater 10, and is transported to the boiler main body 1 by the feed water pump 11, so as to realize recovery of the flue gas and exhaust steam waste heat.

[0047] In the utility model, unless another definite provision and limitation, the term "mount", "link", "connect", "fix" and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection or each other can communicate;Can be direct connection, also can indirectly connect through intermediate medium, can be two element internal communication or two element mutual action relation, unless another definite limitation.For ordinary skilled person in the art, can understand the above-mentioned term in the utility model concrete meaning according to specific circumstances.

[0048] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, and not all the embodiments, the preferred embodiments of the utility model are given in the drawings, but do not limit the patent range of the utility model.The utility model can be realized in many different forms, and contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing specific embodiments, or make equivalent replacement to part of the technical features.For equivalent structures made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, are also within the patent protection scope of the utility model.

Claims

1. A comprehensive energy saving system of steam engine flue gas exhaust steam combined heat recovery, characterized in that, The application relates to a waste heat recovery system of a steam turbine, which comprises a boiler body (1), a steam turbine body (2) connected with the boiler body (1), a condenser (3) and a waste steam waste heat recovery part, wherein a flue gas waste heat recovery part is connected between the boiler body (1) and the condenser (3), the flue gas waste heat recovery part is used for recovering flue gas waste heat to realize primary heating of condensate water, and the waste steam waste heat recovery part is used for recovering waste steam waste heat to realize secondary heating of the condensate water.

2. A combined exhaust gas and steam exhaust heat recovery system for a steam turbine according to claim 1, wherein The waste steam waste heat recovery part comprises a waste steam recovery jet heat pump (4) connected with the steam turbine body (2).

3. A combined exhaust gas and steam exhaust heat recovery system for a steam turbine according to claim 2, wherein, The waste steam recovery jet heat pump (4) is connected with a heat pump heater (5), and a hot water conveying part is connected between the heat pump heater (5) and the boiler body (1).

4. A combined flue gas and exhaust steam heat recovery system for a steam turbine according to claim 3, wherein The hot water conveying part comprises a feed water heater (10) connected with the heat pump heater (5), the feed water heater (10) is connected with a feed water pump (11), and the feed water pump (11) is connected with the boiler body (1).

5. A combined exhaust gas and steam exhaust heat recovery system for a steam turbine according to claim 4, wherein The feed water heater (10) is used for reheating condensate water before the condensate water enters the boiler body (1), and the feed water pump (11) is used for providing conveying power for the condensate water entering the boiler body (1).

6. A combined flue gas and exhaust steam heat recovery system for a steam turbine according to claim 5, wherein, The flue gas waste heat recovery part comprises a flue gas waste heat recovery heater (8) connected with the boiler body (1).

7. A combined flue gas and exhaust steam heat recovery system for a steam turbine according to claim 6, wherein, The flue gas waste heat recovery heater (8) is connected with a condensate water pump (7), the condensate water pump (7) is connected with a condensate water tank (6), and the condensate water tank (6) is connected with the condenser (3).

8. A combined flue gas and exhaust steam heat recovery system for a steam turbine according to claim 7, wherein, The flue gas waste heat recovery heater (8) is also connected with the heat pump heater (5).

9. A combined exhaust gas and steam exhaust heat recovery system for a steam turbine according to claim 8, wherein, The flue gas waste heat recovery heater (8) is connected with a chimney (9) for high-altitude emission of flue gas.

10. A combined flue gas and exhaust steam heat recovery system for a steam turbine according to claim 9, wherein, The flue gas waste heat recovery heater (8) is used for realizing heat exchange between flue gas and condensate water of the boiler body (1) to realize heating of the condensate water.

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