Combined heat and power supply device of boiler

Abstract

The utility model provides a boiler cogeneration device, which relates to the technical field of waste incineration devices and comprises a boiler and a steam turbine which are connected through a steam pipeline, the steam pipeline is communicated with a steam branch pipe, and the tail end of the steam branch pipe is communicated with a heat consumer. The steam branch pipe is sequentially provided with a first valve assembly, a temperature and pressure reducer and an outlet electric door in the steam flowing direction. A steam exhaust port of the steam turbine communicates with a steam condensing assembly, the steam condensing assembly communicates with the boiler through a water supply pipeline, the water supply pipeline is sequentially provided with a heater assembly, a deoxidizing assembly and a desuperheating water branch in the flowing direction of condensed water, the desuperheating water branch is connected with a temperature and pressure reducer, and a second valve assembly is arranged on the desuperheating water branch. The technical problems that in the prior art, the waste heat recovery efficiency is low, and parts for waste heat recovery at different positions are lacked are solved, and the technical effects that waste heat is utilized in a gradient mode, the energy utilization rate is increased, and energy consumption is reduced are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to garbage incineration device technical field, especially a kind of boiler cogeneration device. BACKGROUND

[0002] In garbage incineration power plant, grate as core equipment, bears the purpose of heat energy generated by garbage incineration, and the heat energy generated is as the basis for realizing energy conversion. By incinerating garbage, grate converts chemical energy into heat energy, providing energy source for subsequent power generation and heating links.

[0003] In existing garbage incineration power generation system, boiler cogeneration device is directly introduced into steam turbine by steam generated by grate, only pays attention to power generation link, ignores effective recovery and utilization of a large amount of waste heat after steam work. In addition, the waste heat in turbine exhaust steam is taken away by cooling water in condenser, causing a large amount of energy waste and low energy utilization efficiency.

[0004] Therefore, in the prior art, the waste heat recovery efficiency of boiler cogeneration device is low, and there is lack of part for waste heat recovery at different positions, so that waste heat resources cannot be fully utilized. For example, the waste heat in boiler exhaust and turbine exhaust is not recovered and utilized separately, so that a large amount of available heat energy is wasted. SUMMARY

[0005] The utility model aims at providing a kind of boiler cogeneration device to alleviate the technical problems of low waste heat recovery efficiency and lack of part for waste heat recovery at different positions in prior art.

[0006] The utility model provides a kind of boiler cogeneration device, it includes boiler and steam turbine connected by steam pipeline;

[0007] Steam pipeline is communicated with steam branch pipe, the end of steam branch pipe is communicated with heat user, steam branch pipe is sequentially provided with first valve assembly, desuperheater and outlet electric door along steam flow direction;

[0008] The exhaust port of steam turbine is communicated with condensing component, and condensing component is communicated with boiler by water supply pipeline, water supply pipeline is sequentially provided with heater assembly, deaerating component and desuperheating water branch along condensate flow direction, desuperheating water branch is connected with desuperheater, and second valve assembly is arranged on desuperheating water branch.

[0009] Further, the boiler includes furnace cavity, grate and steam drum;

[0010] Grate is located in the middle of furnace cavity, for burning garbage, steam drum is arranged above furnace cavity, for steam-water separation, and steam drum is communicated with water supply pipeline.

[0011] Further, the first valve assembly comprises a first manual valve, a first electric regulating valve arranged in sequence along a steam flow direction.

[0012] Further, the condensing assembly comprises a condenser and a condensate pump, the steam inlet of the condenser is communicated with the exhaust port of the steam turbine, and the condenser is connected with the condensate pump; the condensate pump is further connected with a water adding pipeline.

[0013] Further, the heater assembly comprises a shaft seal heater and a low-pressure heater arranged in sequence along a condensate flow direction, and the water inlet of the shaft seal heater is connected with the condensate pump.

[0014] Further, the deaerating assembly comprises a deaerator and a deaerated water pump arranged in sequence along a condensate flow direction, the inlet of the deaerator is communicated with the outlet of the low-pressure heater, and the outlet of the deaerated water pump is communicated with the boiler.

[0015] Further, the second valve assembly comprises a plurality of second manual valves and second electric regulating valves arranged in sequence along a water flow direction.

[0016] Further, the water supply pipeline is externally coated with a thermal insulation layer, and the thermal insulation layer is any one of rock wool, glass wool or polyurethane foam.

[0017] Beneficial effects:

[0018] The boiler combined heat and power supply device provided by the utility model has the advantages that the steam branch pipe is arranged to realize steam distribution, part of the boiler steam above 300 DEG C to 500 DEG C is delivered to the heat user through the desuperheater, the originally wasted heat energy is effectively utilized, the heat supply demand is met, and the comprehensive utilization rate of energy is improved.

[0019] The steam branch pipe is arranged to realize steam distribution, part of the boiler steam above 300 DEG C to 500 DEG C is delivered to the heat user through the desuperheater, the originally wasted heat energy is effectively utilized, the heat supply demand is met, and the comprehensive utilization rate of energy is improved.

[0020] Meanwhile, the condensing assembly converts the waste heat in the exhaust steam of the steam turbine into water supply for the boiler, improves the energy utilization rate when the steam turbine produces power and heat combined supply, and further has a 100 DEG C to 150 DEG C desuperheating water branch pipe connected to the desuperheater as desuperheating cooling water, thereby saving energy.

[0021] By recycling the steam waste heat, the consumption of additional energy is reduced, and the comprehensive cost of power generation and heat supply is lowered. The multiple valve assemblies arranged on the steam branch pipe and the water supply pipeline can timely cut off or regulate the flow of medium when the system is abnormal, thereby playing a safety protection role. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 The structure schematic diagram of the boiler combined heat and power supply device provided by the embodiments of the present application is shown in the figure.

[0024] Figure 2 The structure schematic diagram of the boiler in the boiler combined heat and power supply device provided by the embodiments of the present application is shown in the figure.

[0025] Icon: 1-steam pipeline; 2-boiler; 201-furnace cavity; 202-grate; 203-steam drum; 3-steam turbine; 4-steam branch pipe; 5-first valve assembly; 501-first manual valve; 502-first electric regulating valve; 6-temperature and pressure reducer; 7-outlet electric door; 8-steam condensing assembly; 801-steam condenser; 802-condensate pump; 803-water adding pipeline; 9-water supply pipeline; 10-heater assembly; 1001-shaft seal heater; 1002-low pressure heater; 11-oxygen removing assembly; 1101-oxygen remover; 1102-oxygen removing water pump; 12-temperature reducing water branch; 13-second valve assembly; 1301-second manual valve; 1302-second electric regulating valve. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.

[0028] It should be noted that: similar reference numbers 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 subsequent drawings.

[0029] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the application is used, and are merely for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] Some embodiments of the application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0033] As Figure 1 , Figure 2As shown, the utility model embodiment provides a kind of boiler cogeneration device, including boiler 2 and steam turbine 3 connected by steam pipeline 1, steam pipeline 1 is communicated with steam branch pipe 4, the end of steam branch pipe 4 is communicated with heat user, steam branch pipe 4 is sequentially provided with first valve assembly 5, desuperheater 6 and outlet electric door 7 along steam flow direction;

[0034] The exhaust port of steam turbine 3 is communicated with condensing assembly 8, and the condensing assembly 8 is communicated with the boiler 2 through the water supply pipeline 9. The water supply pipeline 9 is sequentially provided with heater assembly 10, deaerating assembly 11 and desuperheating water branch 12 along the condensate flow direction. The desuperheating water branch 12 is connected with the desuperheater 6, and the second valve assembly 13 is arranged on the desuperheating water branch 12.

[0035] Specifically, one end of the steam pipeline 1 is connected to the steam outlet of the boiler 2, and the other end is connected to the steam inlet of the steam turbine 3. The steam pipeline 1 serves as a channel for the high-temperature and high-pressure steam generated by the boiler 2 to reach the steam turbine 3. The steam branch pipe 4 is branched from the steam pipeline 1 through a three-way connection and is directly connected to the heat user (including industrial steam users and steam heating users. Industrial steam users directly apply heat energy to production processes, workshops, laboratories, etc., while steam heating users are used for heating needs. ) at the end. On the steam branch pipe 4, along the steam flow direction, there is a first valve assembly 5 near the connection between the steam pipeline 1 and the steam branch pipe 4. Then there is a desuperheater 6 downstream of the first valve assembly 5. An outlet electric door 7 is arranged at the end of the steam branch pipe 4 near the heat user.

[0036] The inlet of the condensing assembly 8 is connected to the exhaust port of the steam turbine 3 to receive the exhaust steam after the steam turbine 3 does work. The outlet of the condensing assembly 8 is connected to the boiler 2 through the water supply pipeline 9, so that the condensate water flows back to the boiler 2. On the water supply pipeline 9, along the condensate flow direction, a heater assembly 10, a deaerating assembly 11 and a desuperheating water branch 12 are sequentially connected. The heater assembly 10 is near the outlet of the condensing assembly 8 and preliminarily heats the condensate water from the condensing assembly 8. The deaerating assembly 11 is used to remove oxygen from the condensate water. The desuperheating water branch 12 branches from the water supply pipeline 9 and is connected to the desuperheater 6 as cooling water for the desuperheater 6. A second valve assembly 13 is arranged on the desuperheating water branch 12.

[0037] The steam branch pipe 4 is communicated with the heat user, so that the steam of about 300 DEG C to 500 DEG C which is originally wasted after directly entering the steam turbine 3 to do work is transported to the heat user, the cascade utilization of steam heat energy is realized, the power generation and heat supply are combined, and the comprehensive utilization efficiency of energy is improved.

[0038] The first valve assembly 5, the outlet electric door 7 and the second valve assembly 13 are arranged, so that the control of the steam and the flow of the desuperheating water is realized.

[0039] The deoxidizing assembly 11 removes the oxygen in the condensed water, prevents the metal parts in the boiler 2 and the water supply pipeline 9 from being oxidized and corroded, reduces the loss degree of equipment, and prolongs the service life of equipment.

[0040] In the embodiment of the utility model, the boiler 2 includes furnace cavity 201, grate 202 and steam pocket 203.

[0041] The grate 202 is located in the middle part of the furnace cavity 201, and the steam pocket 203 is arranged above the furnace cavity 201 and is used for steam-water separation.

[0042] The first valve assembly 5 includes the first manual valve 501 and the first electric regulating valve 502 which are arranged in sequence along the steam flow direction.

[0043] Specifically, as shown in the figure, Figure 2As shown, the grate 202 is located in the middle of the furnace chamber 201 to provide a combustion site for the garbage. The furnace chamber 201 is a space for garbage incineration. The steam drum 203 is arranged above the furnace chamber 201 and is connected with the heating surface in the furnace chamber 201 through the riser and the downcomer. The high-temperature flue gas generated by the combustion of the garbage in the furnace chamber heats the water in the furnace to form a steam-water mixture, and the steam-water mixture enters the steam drum 203 through the riser and is separated into steam and water in the steam drum 203. The separated water returns to the heating surface in the furnace chamber 201 through the downcomer to continue the circulation heating. At the same time, the steam drum 203 is connected with the water supply pipeline 9, and the water supply pipeline 9 is a water source for the water circulation in the furnace.

[0044] The steam branch pipe 4 is connected with the steam pipeline 1, and the first valve assembly 5 is installed on the steam branch pipe 4 and arranged in the steam flow direction. The first manual valve 501 is used to manually cut off the steam flow in the steam branch pipe 4 when the equipment is overhauled, maintained or abnormally occurs. The first electric regulating valve 502 automatically adjusts the flow and pressure of the steam according to the demand of the heat user and the operation state of the system to control the amount of steam entering the steam branch pipe 4. The first manual valve 501 and the first electric regulating valve 502 are arranged to realize the double control of the steam in the steam branch pipe 4.

[0045] It should be noted that the boiler 2 in the utility model is a conventional setting, and further includes a flue, an air supply channel and the like. The embodiment is only based on the connection position related to the water supply pipeline 9.

[0046] In the embodiment of the utility model, the condensing assembly 8 includes a condenser 801 and a condensate pump 802, the steam inlet of the condenser 801 is connected with the exhaust port of the steam turbine 3, and the condenser 801 is connected with the condensate pump 802; the condensate pump 802 is further connected with a water adding pipeline 803.

[0047] The heater assembly 10 includes a shaft seal heater 1001 and a low-pressure heater 1002 arranged in sequence along the condensate flow direction, and the water flow inlet of the shaft seal heater 1001 is connected with the condensate pump 802.

[0048] The deaerating assembly 11 includes a deaerator 1101 and a deaerating water pump 1102 arranged in sequence along the condensate flow direction, the inlet of the deaerator 1101 is connected with the outlet of the low-pressure heater 1002, and the outlet of the deaerating water pump 1102 is connected with the boiler 2.

[0049] Specifically, the steam inlet of the condenser 801 is directly connected with the exhaust port of the steam turbine 3, and the steam turbine 3 exhausts after work. After the condenser 801 condenses the exhaust into water, the condensate flows into the condensate pump 802 below by gravity. The condensate pump 802 is responsible for lifting and delivering the condensate. In addition, the condensate pump 802 is further connected with the water adding pipeline 803, and the water adding pipeline 803 is used to supplement the water loss in the system operation process to ensure the water amount circulating into the boiler 2.

[0050] The water inlet of the shaft seal heater 1001 is connected with the water outlet of the condensate pump 802, so that the condensate output from the condensate pump 802 can flow into the shaft seal heater 1001 and the low-pressure heater 1002. The low-pressure heater 1002 further heats the condensate by using the waste heat of the steam turbine extraction steam, so as to increase the temperature of the condensate. The shaft seal heater 1001 and the low-pressure heater 1002 heat the condensate by using the waste heat of the steam turbine shaft seal steam and extraction steam, so that the originally wasted heat is fully utilized. By increasing the temperature of the condensate, the energy required for the boiler to heat water is reduced, and the energy utilization rate of the entire cogeneration system is improved.

[0051] The inlet of the deaerator 1101 is communicated with the outlet of the low-pressure heater 1002, and the heated condensate flows into the deaerator 1101. The deaerator 1101 performs deaeration treatment to remove the dissolved oxygen and other gases therein. The deaerated water flows out from the bottom of the deaerator 1101 and enters the inlet of the deaerated water pump 1102, and is sent into the boiler 2. The deaerator 1101 effectively prevents corrosion of the boiler 2 and the pipeline. Otherwise, the dissolved oxygen in the water will chemically react with the metal, causing equipment corrosion and damage, and shortening the service life of the equipment.

[0052] In the embodiment of the utility model, the second valve assembly 13 includes a plurality of second manual valves 1301 and a second electric regulating valve 1302 arranged in sequence along the water flow direction.

[0053] The water supply pipeline 9 is tightly covered by the thermal insulation layer, and the thickness of the thermal insulation layer is uniform and tightly adheres to the outer wall of the pipeline to ensure that the water supply pipeline 9 is thermally insulated, the heat loss into the boiler 2 is reduced, and the energy utilization efficiency is improved.

[0054] Specifically, the second valve assembly 13 is installed on the desuperheating water branch 12, and along the flow direction of the desuperheating water, a plurality of second manual valves 1301 are arranged in sequence, and the second electric regulating valve 1302 is arranged downstream of the plurality of second manual valves 1301. The plurality of second manual valves 1301 and the second electric regulating valve 1302 are connected in series in the desuperheating water branch 12, control the flow and flow regulation of the desuperheating water at the same time, and prevent water leakage.

[0055] The water supply pipeline 9 is tightly covered by the thermal insulation layer, and the thickness of the thermal insulation layer is uniform and tightly adheres to the outer wall of the pipeline to ensure that the water supply pipeline 9 is thermally insulated, the heat loss into the boiler 2 is reduced, and the energy utilization efficiency is improved.

[0056] Based on the above embodiment, the working process of the boiler cogeneration device provided by the utility model is as follows:

[0057] The 300-500℃ steam generated by the boiler 2 enters the steam pipeline 1, a part of which enters the steam turbine 3 to drive it to generate electricity. At the same time, the steam branch pipe 4 connected with the steam pipeline 1 leads another part of the steam to be introduced, and the steam passes through the first valve assembly 5, the desuperheater 6 (and the outlet electric door 7) in sequence, and is finally delivered to the heat user to realize waste heat supply.

[0058] The exhaust steam after the steam turbine 3 does work enters the condenser 801 and is condensed into water. The condensed water flows into the condensate pump 802 by gravity, and the condensate pump 802 supplements the water quantity through the water adding pipeline 803; the condensed water enters the shaft seal heater 1001 and the low-pressure heater 1002 to improve the temperature and reduce the energy required by the boiler to heat water.

[0059] The heated condensed water enters the deaerator 1101 and is sent back to the boiler 2 through the water supply pipeline 9 to supplement the water source for the water circulation in the boiler. The 100-150℃ desuperheating water branch 12 introduced from the water supply pipeline 9 is connected to the desuperheater 6 to adjust the steam temperature entering the heat user, and the cycle of the whole combined heat and power supply device is completed.

[0060] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the utility model, but not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1.A boiler combined heat and power plant, comprising a boiler (2) and a steam turbine (3) connected by a steam pipeline (1), characterized in that, a steam branch pipeline (4) is connected to the steam pipeline (1), an end of the steam branch pipeline (4) is connected to a heat user, and the steam branch pipeline (4) is sequentially provided with a first valve assembly (5), a desuperheater (6) and an outlet electric door (7) along a steam flow direction; an exhaust steam port of the steam turbine (3) is connected to a condensing assembly (8), the condensing assembly (8) is connected to the boiler (2) through a water supply pipeline (9), the water supply pipeline (9) is sequentially provided with a heater assembly (10), an oxygen removal assembly (11) and a desuperheating water branch (12) along a condensate flow direction, the desuperheating water branch (12) is connected to the desuperheater (6), and the desuperheating water branch (12) is provided with a second valve assembly (13). 2.The boiler combined heat and power plant according to claim 1, characterized in that, the boiler (2) comprises a furnace cavity (201), a grate (202) and a steam drum (203); the grate (202) is located in a middle part of the furnace cavity (201) and is used for burning garbage, the steam drum (203) is arranged above the furnace cavity (201) and is used for steam-water separation, and the steam drum (203) is connected to the water supply pipeline (9). 3.The boiler combined heat and power plant according to claim 1, characterized in that, the first valve assembly (5) comprises a first manual valve (501) and a first electric regulating valve (502) sequentially arranged along a steam flow direction. 4.The boiler combined heat and power plant according to claim 1, characterized in that, the condensing assembly (8) comprises a condenser (801) and a condensate pump (802), a steam inlet of the condenser (801) is connected to an exhaust steam port of the steam turbine (3), and the condenser (801) is connected to the condensate pump (802); and the condensate pump (802) is further connected to a water adding pipeline (803). 5.The boiler combined heat and power plant according to claim 4, characterized in that, the heater assembly (10) comprises a shaft seal heater (1001) and a low-pressure heater (1002) sequentially arranged along a condensate flow direction, and a water inlet of the shaft seal heater (1001) is connected to the condensate pump (802). 6.The boiler combined heat and power plant according to claim 5, characterized in that, the oxygen removal assembly (11) comprises an oxygen removal device (1101) and an oxygen removal water pump (1102) sequentially arranged along a condensate flow direction, an inlet of the oxygen removal device (1101) is connected to an outlet of the low-pressure heater (1002), and an outlet of the oxygen removal water pump (1102) is connected to the boiler (2). 7.The boiler combined heat and power plant according to claim 1, characterized in that, the second valve assembly (13) comprises a plurality of second manual valves (1301) and a second electric regulating valve (1302) sequentially arranged along a water flow direction. 8.The boiler combined heat and power plant according to claim 1, characterized in that, The water supply pipeline (9) is externally coated with a thermal insulation layer, which is any one of rock wool, glass wool or polyurethane foam.

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