Garbage drying system utilizing unit steam

Abstract

The utility model discloses a garbage drying system utilizing unit steam. The garbage drying system comprises a sub-high pressure unit and a steam-air preheater assembly, the steam-air preheater assembly comprises a flow meter, a regulating valve and a steam-air preheater; the steam turbine set is connected with the multiple steam-air pre-heaters through heating steam pipelines and used for providing a section of extracted steam for the steam-air pre-heaters. The flow meter is used for measuring the flow of steam input into the steam-air preheater; the regulating valve is used for controlling the flow of steam input into the steam-air preheater; the steam-air preheater is used for adjusting the air outlet temperature of primary air so as to dry garbage. The system not only achieves the effect of drying garbage, but also improves the utilization rate of steam.

Description

Technical Field

[0001] The utility model relates to the technical field of garbage drying, in particular to a garbage drying system using the steam of a unit. Background Art

[0002] In recent years, the rapid development of the garbage treatment industry has promoted the improvement of the garbage incineration treatment process. At present, China usually uses incinerators for garbage incineration treatment. Generally, the treatment scale of a general garbage incineration plant is 2 sets of 800t / d mechanical grate incinerators and is equipped with 1 set of 50MW steam turbine generator set. The combustion process of garbage in the incinerator is usually divided into three stages: a drying stage, a combustion stage, and an afterburning stage. In the drying stage, high-temperature steam is used to preheat the primary air at a high temperature to achieve the effect of garbage drying. However, a large amount of steam is consumed in this process, resulting in a low steam utilization rate. Summary of the Utility Model

[0003] The utility model provides a garbage drying system using the steam of a unit, which solves the problem that a large amount of steam is consumed in the existing garbage drying process, resulting in a low steam utilization rate.

[0004] A garbage drying system using the steam of a unit provided by the utility model includes:

[0005] A sub-high-pressure unit and a steam-air preheater assembly;

[0006] The sub-high-pressure unit includes multiple boilers and a steam turbine unit;

[0007] Each boiler is equipped with the steam-air preheater assembly;

[0008] Each steam-air preheater assembly includes a flowmeter, a regulating valve, and a steam-air preheater;

[0009] The steam turbine unit is respectively connected to multiple steam-air preheaters through heating steam pipelines, and is used to provide steam for one-stage extraction steam for the steam-air preheaters;

[0010] The flowmeter and the regulating valve are sequentially arranged on the heating steam pipeline, and the flowmeter is connected to one end of the regulating valve, and the other end of the regulating valve is connected to the steam-air preheater;

[0011] The flowmeter is used to measure the steam flow input into the steam-air preheater; the regulating valve is used to control the steam flow input into the steam-air preheater; the steam-air preheater is used to adjust the outlet air temperature of the primary air to dry the garbage.

[0012] Preferably, each steam-air preheater assembly further includes: a primary air fan for providing primary air for the steam-air preheater.

[0013] Preferably, it further includes: a deaerator;

[0014] The steam-air preheater is provided with a steam inlet, an air inlet, an air outlet and a drain outlet;

[0015] The steam inlet is connected to the other end of the regulating valve; the air inlet is connected to the primary air fan; the air outlet is connected to the bottom of the grate of the incinerator; the drain outlet is connected to the deaerator.

[0016] Preferably, the boiler is provided with a steam port and a water inlet; the steam turbine unit is provided with a steam inlet pipe port, a water outlet pipe port and a steam extraction pipe port;

[0017] The steam port is communicated with the steam inlet pipe port, and the water outlet pipe port is communicated with the water inlet through a feed water pump; the steam extraction pipe port is communicated with the heating steam pipeline.

[0018] Preferably, the two steam-air preheaters associated with each boiler are respectively arranged on the zero-meter floor of the boiler room on both sides of the incinerator.

[0019] Preferably, the two primary air fans associated with each boiler are respectively arranged on the elevation steel frames on both sides of the boiler.

[0020] Preferably, the number of boilers of the sub-high pressure unit and the number of steam-air preheater assemblies of the boiler are both 2.

[0021] Preferably, the rated power of the steam turbine unit is 50 MW; the outlet pressure and outlet temperature of the steam of the first-stage steam extraction of the steam turbine unit are 1.2 MPa to 7.4 MPa and 273.8 °C to 289.62 °C respectively.

[0022] Preferably, the pipe diameter model of the flowmeter is specifically DN150.

[0023] Preferably, the flowmeter is specifically an orifice plate electromagnetic flowmeter.

[0024] It can be seen from the above technical solutions that the present utility model has the following advantages:

[0025] The utility model provides a garbage drying system using the steam of a unit, comprising: a sub-high-pressure unit and a steam-air preheater assembly; the steam-air preheater assembly includes a flowmeter, a regulating valve and a steam-air preheater; the steam turbine unit is respectively connected to a plurality of steam-air preheaters through heating steam pipelines for providing steam of a first-stage extraction steam for the steam-air preheaters; the flowmeter is used for measuring the steam flow rate input into the steam-air preheater; the regulating valve is used for controlling the steam flow rate input into the steam-air preheater; the steam-air preheater is used for adjusting the outlet air temperature of the primary air to dry the garbage. While achieving the effect of drying the garbage, this system effectively saves the steam usage amount, and solves the technical problem that a large amount of steam is consumed in the existing garbage drying process, resulting in a low steam utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of a garbage drying system using the steam of a unit provided by this application;

[0028] Among them, the reference numerals are: boiler 1, steam turbine unit 2, feed water pump 3, heating steam pipeline 4, flowmeter 5, regulating valve 6, steam-air preheater 7. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The embodiment of the present utility model provides a garbage drying system using the steam of a unit, which is used to solve the technical problem that a large amount of steam is consumed in the existing garbage drying process, resulting in a low steam utilization rate.

[0030] In order to make the utility model purpose, features and advantages of the present utility model more obvious and understandable, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the embodiments described below are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0032] Unless otherwise clearly specified and defined, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0033] Please refer to Figure 1 , an embodiment of a garbage drying system using the steam of a unit provided by the present application, includes: a sub-high-pressure unit and a steam-air preheater assembly;

[0034] The sub-high-pressure unit includes multiple boilers 1 and a steam turbine unit 2; each boiler 1 is equipped with a steam-air preheater assembly; each steam-air preheater assembly includes a flow meter 5, a regulating valve 6, and a steam-air preheater 7;

[0035] The steam turbine unit 2 is respectively connected to multiple steam-air preheaters 7 through a heating steam pipeline 4 for providing steam for one-stage extraction steam to the steam-air preheaters 7; the flow meter 5 and the regulating valve 6 are sequentially arranged on the heating steam pipeline 4, and the flow meter 5 is connected to one end of the regulating valve 6, and the other end of the regulating valve 6 is connected to the steam-air preheater 7; the flow meter 5 is used to measure the steam flow rate input into the steam-air preheater 7; the regulating valve 6 is used to control the steam flow rate input into the steam-air preheater 7; the steam-air preheater 7 is used to adjust the outlet air temperature of the primary air to dry the garbage.

[0036] It should be noted that the above one-stage extraction steam refers to that when designing the steam turbine scheme, a part of the steam discharged from the exhaust port of a certain stage impeller in the middle of the steam turbine is led out as the steam required by the external device to improve the efficiency and energy saving of the steam turbine; among them, in the present application, the steam generated by the boiler 1 is used to drive the steam turbine unit 2 to do work, and a part of the steam discharged from the exhaust port of the steam turbine unit 2 is led out as the steam input into the steam-air preheater 7 to save steam volume;

[0037] Specifically, this application mainly focuses on the low-pressure section of the steam-air preheater 7. Among them, the heating steam for the low-pressure section of the steam-air preheater 7 comes from the first-stage extraction steam of the steam turbine unit 2, and the heating steam for the high-pressure section of the steam-air preheater 7 comes from the steam drum extraction steam of the steam turbine unit 2;

[0038] A flowmeter 5 is installed in front of the regulating valve 6 of the heating steam pipeline 4 to facilitate the observation of the steam flow of the first-stage extraction steam of the steam turbine unit 2, and thus obtain the heat consumption rate of the steam turbine unit 2; in actual use, for the convenience of on-site staff to monitor in real time, the flowmeter 5 can be connected to the distributed control system (DCS system). The staff can calculate the steam flow of the flowmeter 5 for each group of steam-air preheater components, count the non-regulated extraction steam usage of the steam turbine unit 2, obtain the heat consumption rate of the steam turbine unit 2, and then obtain the working efficiency of the steam turbine unit 2;

[0039] It should be noted that the description of the above usage method is only used to illustrate the beneficial effects brought by the structure of this device, and does not represent the protection content of this device involving the above method. After obtaining the device, those skilled in the art can process the data collected by the device by themselves. This data processing process (such as the calculation process of the heat consumption rate of the steam turbine unit 2) can be achieved through well-known technologies and is not an innovation of this application;

[0040] Among them, the calculation formula for the heat consumption rate of the above steam turbine unit 2 is as follows:

[0041]

[0042] In the formula: represents the steam flow before the main steam valve, represents the steam enthalpy value before the main steam valve, represents the reheated steam flow, represents the hot reheat enthalpy value, represents the cold reheat enthalpy value, represents the feed water flow of the boiler 1, represents the feed water enthalpy value of the boiler 1, represents the section of non-regulated extraction steam flow, represents the section of non-regulated extraction steam enthalpy value, represents the section of make-up water flow, represents the section of make-up water enthalpy value, represents the generator end output.

[0043] In this embodiment, the steam-air preheater 7 uses the steam from the first-stage extraction steam of the steam turbine unit 2 to heat the primary air at about 20 °C to about 180 °C - 220 °C. At the same time, the flowmeter 5 and the regulating valve 6 are combined to facilitate the adjustment of the steam flow rate entering the steam-air preheater 7, thereby controlling the air temperature for garbage drying. Specifically, the staff can adjust the steam flow rate entering the corresponding steam-air preheater 7 according to the humidity of the garbage beside the boiler 1. For example, when the humidity is relatively high, the steam flow rate of the steam-air preheater 7 can be increased to raise the outlet temperature of the primary air; when the humidity is relatively low, the steam flow rate of the steam-air preheater 7 can be decreased to lower the outlet temperature of the primary air. The garbage drying system provided in this embodiment not only achieves the effect of drying garbage, but also improves the utilization rate of steam, reduces heat loss, reduces the burning loss rate, and further improves the utilization rate of subsequent garbage incineration.

[0044] Among them, the staff can judge the garbage humidity condition of the boiler 1 based on comprehensive factors such as the combustion condition of the furnace, the load of the boiler 1, and the furnace temperature.

[0045] In a specific embodiment, each steam-air preheater assembly further includes: a primary air fan for supplying primary air to the steam-air preheater 7.

[0046] It can be understood that the primary air fan can extract air from the garbage storage.

[0047] In a specific embodiment, it further includes: a deaerator; the steam-air preheater 7 is provided with a steam inlet, an air inlet, an air outlet, and a drain outlet; the steam inlet is connected to the other end of the regulating valve 6; the air inlet is connected to the primary air fan; the air outlet is connected to the bottom of the grate of the incinerator; the drain outlet is connected to the deaerator.

[0048] It can be understood that the air outlet of the steam-air preheater 7 outputs hot primary air, and the hot air leads to the bottom of the grate of the incinerator, and the hot air is used to dry the garbage. Among them, the rated pressure and rated temperature of the main steam of the incinerator are 6.4 MPa and 480 °C respectively. At the same time, to improve the utilization rate of water resources, the water output from the deaerator can be used as the make-up water for the boiler 1.

[0049] In a specific embodiment, the boiler 1 is provided with a steam port and a water inlet; the steam turbine unit 2 is provided with a steam inlet pipe port, a water outlet pipe port, and a steam extraction pipe port; the steam port is communicated with the steam inlet pipe port, and the water outlet pipe port is communicated with the water inlet through the feed water pump 3; the steam extraction pipe port is communicated with the heating steam pipeline 4.

[0050] It can be understood that the boiler 1 combined with the steam turbine unit 2 can realize the steam-water cycle. For example, the steam generated during the heating process of the boiler 1 is transmitted to the steam turbine unit 2. The steam turbine unit 2 does work to convert the steam into water, and then it is transmitted to the boiler 1 for water replenishment through the feed water pump 3. At the same time, the boiler 1 provides power for the steam turbine unit 2.

[0051] In a specific embodiment, the two steam-air preheaters 7 associated with each boiler 1 are respectively arranged at the zero-meter level between the boilers 1 on both sides of the incinerator.

[0052] In a specific embodiment, the two primary air fans associated with each boiler 1 are respectively arranged on the elevation steel frames on both sides of the boiler 1.

[0053] Specifically, the height on the elevation steel frame is preferably about five meters.

[0054] In a specific embodiment, both the number of boilers 1 of the sub-high pressure unit and the number of steam-air preheater assemblies of the boiler 1 are 2.

[0055] In this embodiment, the sub-high pressure unit includes two boilers 1, and each boiler 1 is equipped with two primary air fans and two steam-air preheaters 7. For a certain boiler 1, the associated steam-air preheaters 7 are respectively located on both sides of the boiler 1 in terms of positional relationship. The staff can adjust the corresponding regulating valves 6 according to the garbage humidity on both sides of the boiler 1 to control the steam flow rate entering the corresponding steam-air preheater 7. For example, when the garbage humidity on the left side of the boiler 1 is relatively high, at this time, the opening degree of the regulating valve 6 corresponding to the steam-air preheater 7 on the left side of the boiler 1 can be adjusted to control the steam flow rate entering the steam-air preheater 7 on the left side of the boiler 1, so as to increase the outlet temperature of the primary air, that is, to increase it from 180 °C to 200 °C and above for drying the garbage. This device rationally uses the steam flow rate and is also beneficial to garbage incineration.

[0056] In a specific embodiment, the rated power of the steam turbine unit 2 is 50 MW; the outlet pressure and outlet temperature of the steam of the first-stage extraction steam of the steam turbine unit 2 are 1.2 MPa to 7.4 MPa and 273.8 °C to 289.62 °C respectively.

[0057] In a specific embodiment, the pipe diameter model of the flowmeter 5 is specifically DN150.

[0058] In a specific embodiment, the flowmeter 5 is specifically an orifice plate electromagnetic flowmeter.

[0059] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A garbage drying system using unit steam, characterized in that: include: Sub-high pressure unit and steam-air preheater assembly; The sub-high pressure unit includes multiple boilers and steam turbine units; Each of the boilers is equipped with the steam-air preheater assembly; Each of the steam-air preheater assemblies includes a flow meter, a regulating valve and a steam-air preheater; The steam turbine unit is respectively connected to a plurality of steam-air preheaters through heating steam pipelines, so as to provide a section of extracted steam to the steam-air preheaters; The flow meter and the regulating valve are sequentially arranged on the heating steam pipeline, and the flow meter is connected to one end of the regulating valve, and the other end of the regulating valve is connected to the steam-air preheater; The flow meter is used to measure the steam flow rate input to the steam-air preheater; the regulating valve is used to control the steam flow rate input to the steam-air preheater; the steam-air preheater is used to adjust the outlet temperature of the primary air to dry the garbage.

2. The garbage drying system according to claim 1, characterized in that: Each of the steam-air preheater assemblies further includes: a primary air fan for providing primary air to the steam-air preheater.

3. The garbage drying system according to claim 2, characterized in that: Also includes: Deaerator; The steam-air preheater is provided with a steam inlet, an air inlet, an air outlet and a drain outlet; The steam inlet is connected to the other end of the regulating valve; the air inlet is connected to the primary fan; the air outlet is connected to the bottom of the grate of the incinerator; and the drain port is connected to the deaerator.

4. The garbage drying system according to claim 1, characterized in that: The boiler is provided with a steam port and a water inlet; the steam turbine unit is provided with a steam inlet, a water outlet and a steam extraction port; The steam port is connected to the steam inlet pipe port, and the water outlet pipe port is connected to the water inlet via a water feed pump; the steam extraction pipe port is connected to the heating steam pipeline.

5. The garbage drying system according to claim 1, characterized in that: The two steam-air preheaters associated with each boiler are arranged at the zero-meter layer between the boilers on both sides of the incinerator.

6. The garbage drying system according to claim 2, characterized in that: The two primary fans associated with each boiler are arranged on elevated steel frames on both sides of the boiler.

7. The garbage drying system according to claim 1, characterized in that: The number of boilers of the sub-high pressure unit and the number of steam-air preheater components of the boilers are both 2.

8. The garbage drying system according to claim 1, characterized in that: The rated power of the steam turbine unit is 50MW; the outlet pressure and outlet temperature of the steam of the first stage extraction of the steam turbine unit are 1.2 MPa~7.4 MPa and 273.8℃~289.62℃ respectively.

9. The garbage drying system according to claim 1, characterized in that: The pipe diameter model of the flow meter is specifically DN150.

10. The garbage drying system according to claim 1, characterized in that: The flow meter is specifically an orifice plate electromagnetic flow meter.

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