Garbage incinerator boiler waste heat recovery system

Abstract

The utility model relates to the technical field of waste heat recovery of garbage incinerator boilers, and provides a waste heat recovery system of a garbage incinerator boiler. One end of the first pipeline is communicated with the pump assembly; the other end of the first pipeline is communicated with the flue gas heat exchanger, and the flue gas heat exchanger is used for circulating flue gas; one end of the second pipeline is communicated with the flue gas heat exchanger; the other end of the second pipeline is communicated with the first air heater; and one end of the third pipeline communicates with the first air heater, and the other end of the third pipeline communicates with the pump assembly. By means of the technical scheme, the problem that heat in smoke is wasted in the related technology is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery of a garbage incinerator boiler, and specifically to a waste heat recovery system of a garbage incinerator boiler. Background Art

[0002] At present, the flue gas temperature at the tail end of the garbage incinerator boiler is about 160-190℃. After deacidification, dust removal and SCR denitrification, it is discharged through the chimney. The emission temperature is generally 140-180℃. It also contains considerable energy. According to the boiler heat balance theory, the boiler exhaust temperature increases by 12-15℃, and the boiler exhaust heat loss increases by about 1%. The direct emission of flue gas will cause the heat stored in the flue gas to be wasted. Utility Model Content

[0003] The utility model provides a waste heat recovery system for a garbage incinerator boiler, which solves the problem of heat waste in flue gas in the related technology.

[0004] The technical solution of the utility model is as follows:

[0005] A waste heat recovery system for a garbage incinerator boiler, comprising:

[0006] Pump components;

[0007] a first pipeline, one end of which is in communication with the pump assembly;

[0008] a flue gas heat exchanger, wherein the other end of the first pipeline is connected to the flue gas heat exchanger, and the flue gas heat exchanger is used for circulating flue gas;

[0009] a second pipeline, one end of which is connected to the flue gas heat exchanger;

[0010] a first air heater, the other end of the second pipeline being in communication with the first air heater;

[0011] A third pipeline, one end of the third pipeline is connected to the first air heater, and the other end of the third pipeline is connected to the pump assembly.

[0012] As a further technical solution, it also includes:

[0013] a fourth pipeline, one end of which is connected to the second pipeline, and the other end of which is connected to the third pipeline;

[0014] A wall temperature regulating device is arranged on the fourth pipeline, and the wall temperature regulating device is used to regulate the wall temperature of the flue gas heat exchanger.

[0015] As a further technical solution, it also includes:

[0016] Water supply parts;

[0017] A fifth pipeline, one end of which is connected to the water replenishing component, and the other end of which is connected to the third pipeline.

[0018] As a further technical solution, it also includes:

[0019] A soot blowing device is arranged on the flue gas heat exchanger, and the soot blowing device is used to clean the flue gas heat exchanger.

[0020] As a further technical solution, the pump assembly comprises:

[0021] a sixth pipeline, one end of which is connected to the first pipeline, and the other end of which is connected to the third pipeline;

[0022] A first circulation pump, arranged on the sixth pipeline;

[0023] A first valve, disposed on the sixth pipeline, the first valve being used to control whether the sixth pipeline is connected or not;

[0024] a seventh pipeline, arranged in parallel at two ends of the sixth pipeline;

[0025] A second circulation pump is arranged on the seventh pipeline;

[0026] A second valve is disposed on the seventh pipeline, and the second valve is used to control whether the seventh pipeline is connected or not.

[0027] As a further technical solution, it also includes:

[0028] A one-way valve is arranged on the fifth pipeline, and the one-way valve is used to prevent water from flowing back.

[0029] As a further technical solution, it also includes:

[0030] An eighth pipeline, one end of which is arranged on the second pipeline;

[0031] a second air heater, the other end of the eighth pipeline being arranged on the second air heater;

[0032] A ninth pipeline has one end arranged on the third pipeline and the other end arranged on the second air heater.

[0033] As a further technical solution, it also includes:

[0034] There are several flow regulating and distributing devices, which are respectively arranged on the ninth pipeline and the third pipeline. The flow regulating and distributing devices are used to regulate the distribution of water flow to the first air heater and the second air heater.

[0035] As a further technical solution, the pump assembly further includes:

[0036] A three-way pipe, the first end of which is connected to the circulation pump, the second end of which is connected to the third pipeline, and the third end of which is used to add high-temperature water;

[0037] The wall temperature regulating device comprises:

[0038] A regulating valve, arranged on the fourth pipeline, the regulating valve is used to adjust the amount of high-temperature water added;

[0039] A temperature controller is arranged on the fourth pipeline, and the temperature controller is used to detect the inner wall temperature of the flue gas heat exchanger.

[0040] The working principle and beneficial effects of the utility model are:

[0041] In the utility model, heat medium water is transported to the flue gas heat exchanger through the first pipeline under the action of a circulation pump, and the flue gas continuously circulating in the flue gas heat exchanger exchanges heat with the heat medium water, so that the temperature of the heat medium water increases, and the high-temperature heat medium water is transported to the air heater through the third pipeline under the action of the circulation pump, and the heat medium water exchanges heat with the air. After the temperature of the heat medium water decreases, it returns to the flue gas heat exchanger under the action of the circulation pump, and this cycle is repeated to reduce the problem of heat waste in the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present utility model.

[0043] Figure 1 This is a schematic diagram of the first structure of the utility model;

[0044] Figure 2 This is a schematic diagram of the second structure of the utility model;

[0045] In the figure: 1, pump assembly, 2, first pipeline, 3, flue gas heat exchanger, 4, second pipeline, 5, air heater, 6, third pipeline, 7, fourth pipeline, 8, wall temperature regulating device, 9, water supply part, 10, fifth pipeline, 11, soot blowing device, 12, sixth pipeline, 13, first circulation pump, 14, first valve, 15, seventh pipeline, 16, second circulation pump, 17, second valve, 18, one-way valve, 19, eighth pipeline, 20, second air heater, 21, ninth pipeline, 22, flow regulating and distributing device, 23, three-way pipe, 24, regulating valve, 25, temperature controller. DETAILED DESCRIPTION

[0046] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the specific implementation methods of the utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, they can also be understood as further technical solutions without paying creative work. In some figures, components with the same structure or function are only schematically illustrated, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0047] In this article, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0048] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0049] Example

[0050] Reference Figure 1-2 , is an embodiment of the utility model, and proposes

[0051] A waste heat recovery system for a waste incinerator boiler comprises: a pump assembly 1; a first pipeline 2, one end of the first pipeline 2 is connected to the pump assembly 1; a flue gas heat exchanger 3, the other end of the first pipeline 2 is connected to the flue gas heat exchanger 3, and the flue gas heat exchanger 3 is used to circulate flue gas; a second pipeline 4, one end of the second pipeline 4 is connected to the flue gas heat exchanger 3; a first air heater 5, the other end of the second pipeline 4 is connected to the first air heater 5; a third pipeline 6, one end of the third pipeline 6 is connected to the first air heater 5, and the other end of the third pipeline 6 is connected to the pump assembly 1.

[0052] In this embodiment, the heat medium water is transported to the flue gas heat exchanger 3 through the first pipeline 2 under the action of the circulation pump. The flue gas continuously flowing in the flue gas heat exchanger 3 exchanges heat with the heat medium water, so that the temperature of the heat medium water increases. The high-temperature heat medium water is transported to the air heater 5 through the third pipeline 6 under the action of the circulation pump. The heat medium water exchanges heat with the air. After the temperature of the heat medium water decreases, it returns to the flue gas heat exchanger 3 under the action of the circulation pump, and this cycle is repeated to reduce the problem of heat waste in the flue gas.

[0053] Furthermore, it also includes: a fourth pipeline 7, one end of which is connected to the second pipeline 4, and the other end of which is connected to the third pipeline 6; a wall temperature regulating device 8 arranged on the fourth pipeline 7, and the wall temperature regulating device 8 is used to adjust the wall temperature of the flue gas heat exchanger 3.

[0054] In this embodiment, since the flue gas of the garbage incinerator has a high water vapor content and contains a variety of acidic gases, it is very easy to cause low-temperature corrosion of the heat exchange surface at low temperatures. Therefore, measures need to be taken to control the heat exchange wall temperature of the flue gas heat exchanger 3 to be higher than the acid dew point temperature of the flue gas. The wall temperature regulating device 8 is set to ensure the wall temperature of the flue gas heat exchanger 3. According to the flue gas composition of the garbage incinerator, its acid dew point temperature is calculated, so that the wall temperature regulating device 8 regulates part of the non-heat-releasing high-temperature heat medium water to the inlet of the heat medium water circulation pump to ensure that the inlet wall temperature of the flue gas heat exchanger 3 is higher than the flue gas acid dew point temperature, so that low-temperature dew point corrosion will not occur.

[0055] Furthermore, it also includes: a water replenishing component 9; a fifth pipeline 10 whose one end is connected to the water replenishing component 9 and the other end is connected to the third pipeline 6.

[0056] In this embodiment, due to the thermal expansion and possible leakage of water volume in the system, in order to ensure the pressure stability and non-evaporation in the system, a water replenishing component 9 is provided. The water replenished by the water replenishing component 9 can be any condensed water or desalted water in the waste incineration power generation system.

[0057] Furthermore, it also includes: a soot blowing device 11 arranged on the flue gas heat exchanger 3, and the soot blowing device 11 is used to clean the flue gas heat exchanger 3.

[0058] In this embodiment, the flue gas discharged by the waste incinerator boiler is dust-removed to meet environmental protection standards, but it still contains trace amounts of fine dust, which will accumulate on the heat exchange surface of the flue gas heat exchanger 3 over time, increasing its heat transfer resistance and affecting the heat exchange efficiency. Therefore, a soot blowing device 11 is provided to ensure that the heat exchange surface of the flue gas heat exchanger 3 is clean and free of dust, thereby ensuring its heat exchange efficiency.

[0059] Furthermore, the pump assembly 1 includes: a sixth pipeline 12, one end of which is connected to the first pipeline 2 and the other end of which is connected to the third pipeline 6; a first circulation pump 13 arranged on the sixth pipeline 12; a first valve 14 arranged on the sixth pipeline 12, and the first valve 14 is used to control whether the sixth pipeline 12 is connected or not; a seventh pipeline 15 arranged in parallel at both ends of the sixth pipeline 12; a second circulation pump 16 arranged on the seventh pipeline 15; and a second valve 17 arranged on the seventh pipeline 15, and the second valve 17 is used to control whether the seventh pipeline 15 is connected or not.

[0060] In this embodiment, the pump assembly 1 includes a sixth pipeline 12 and a seventh pipeline 15, a first circulation pump 13 and a second circulation pump 16 are respectively arranged on the sixth pipeline 12 and the seventh pipeline 15, a first valve 14 and a second valve 17 respectively control the connection and closing of the sixth pipeline 12, two circulation pumps are used in one and a standby, and frequency conversion regulation is adopted, and the first circulation pump 13 and the second circulation pump 16 are both hot water pumps with good anti-cavitation performance, and the two circulation pumps can avoid the problem of the system being unable to operate due to damage of one circulation pump.

[0061] Furthermore, it also includes: a one-way valve 18 arranged on the fifth pipeline 10, and the one-way valve 18 is used to prevent water from flowing back.

[0062] In this embodiment, a one-way valve 18 is provided on the fifth pipeline 10 to prevent water from flowing back when water is added to the system.

[0063] Furthermore, it also includes: an eighth pipeline 19 with one end arranged on the second pipeline 4; a second air heater 20, and the other end of the eighth pipeline 19 is arranged on the second air heater 20; a ninth pipeline 21 with one end arranged on the third pipeline 6 and the other end arranged on the second air heater 20.

[0064] In this embodiment, an eighth pipeline 19 is provided on the second pipeline 4, and a ninth pipeline 21 is provided on the third pipeline 6. The eighth pipeline 19 and the ninth pipeline 21 are both connected to the second air heater 20, so that the heating of two elements can be realized at the same time.

[0065] Furthermore, it also includes: a flow regulating and distributing device 22, which has a plurality of flow regulating and distributing devices 22, which are respectively arranged on the ninth pipeline 21 and the third pipeline 6, and the flow regulating and distributing devices 22 are used to adjust the distribution of water flow to the first air heater 5 and the second air heater 20.

[0066] In this embodiment, since the two air heaters 5 need to heat different amounts of heat, the heat medium water flow rates that need to be distributed are also different. The flow rate can be distributed through the flow regulating and distributing device 22 to meet the different temperatures required by the two air heaters 5.

[0067] Furthermore, the pump assembly 1 also includes: a three-way pipe 23, the first end of which is connected to the circulation pump, the second end of which is connected to the third pipeline 6, and the third end is used to add high-temperature water; the wall temperature regulating device 8 includes: a regulating valve 24 arranged on the fourth pipeline 7, the regulating valve 24 is used to adjust the amount of high-temperature water added; a temperature controller 25 arranged on the fourth pipeline 7, the temperature controller 25 is used to detect the inner wall temperature of the flue gas heat exchanger 3.

[0068] In this embodiment, the wall temperature regulating device 8 is composed of an electric or pneumatic regulating valve 24 and a temperature controller 25. When the temperature controller 25 detects that the inlet water temperature of the flue gas heat exchanger 3 is lower than or higher than the wall temperature requirement calculated based on the flue gas composition, the regulating valve 24 starts to operate to adjust the flow rate of high-temperature water mixed into the inlet of the heat medium water circulation pump to ensure that the wall temperature of the flue gas heat exchanger 3 is higher than the flue gas dew point temperature, so that low-temperature dew point corrosion does not occur on the heat exchange surface.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A waste heat recovery system for a garbage incinerator boiler, characterized in that: include: Pump assembly (1); A first pipeline (2), one end of the first pipeline (2) being in communication with the pump assembly (1); A flue gas heat exchanger (3), wherein the other end of the first pipeline (2) is connected to the flue gas heat exchanger (3), and the flue gas heat exchanger (3) is used for circulating flue gas; a second pipeline (4), one end of the second pipeline (4) being in communication with the flue gas heat exchanger (3); a first air heater (5), the other end of the second pipeline (4) being in communication with the first air heater (5); A third pipeline (6), one end of the third pipeline (6) is connected to the first air heater (5), and the other end of the third pipeline (6) is connected to the pump assembly (1).

2. A waste incinerator boiler waste heat recovery system according to claim 1, characterized in that: Also includes: a fourth pipeline (7), one end of which is connected to the second pipeline (4), and the other end of which is connected to the third pipeline (6); A wall temperature regulating device (8) is arranged on the fourth pipeline (7), and the wall temperature regulating device (8) is used to regulate the wall temperature of the flue gas heat exchanger (3).

3. The waste heat recovery system of a garbage incinerator boiler according to claim 1, characterized in that: Also includes: Water supply parts (9); A fifth pipeline (10), one end of the fifth pipeline (10) being connected to the water replenishing component (9), and the other end of the fifth pipeline (10) being connected to the third pipeline (6).

4. The waste heat recovery system of a garbage incinerator boiler according to claim 1, characterized in that: Also includes: A soot blowing device (11) is arranged on the flue gas heat exchanger (3), and the soot blowing device (11) is used to clean the flue gas heat exchanger (3).

5. The waste heat recovery system for a garbage incinerator boiler according to claim 2, characterized in that: The pump assembly (1) comprises: a sixth pipeline (12), one end of which is connected to the first pipeline (2), and the other end of which is connected to the third pipeline (6); A first circulation pump (13) is arranged on the sixth pipeline (12); a first valve (14) disposed on the sixth pipeline (12), the first valve (14) being used to control whether the sixth pipeline (12) is connected or disconnected; a seventh pipeline (15) arranged in parallel at both ends of the sixth pipeline (12); a second circulation pump (16), arranged on the seventh pipeline (15); A second valve (17) is arranged on the seventh pipeline (15), and the second valve (17) is used to control whether the seventh pipeline (15) is connected or not connected.

6. The waste heat recovery system for a garbage incinerator boiler according to claim 3, characterized in that: Also includes: A one-way valve (18) is arranged on the fifth pipeline (10), and the one-way valve (18) is used to prevent water from flowing back.

7. The waste heat recovery system of a garbage incinerator boiler according to claim 1, characterized in that: Also includes: an eighth pipeline (19), one end of which is arranged on the second pipeline (4); a second air heater (20), the other end of the eighth pipeline (19) being arranged on the second air heater (20); A ninth pipeline (21) has one end arranged on the third pipeline (6) and the other end arranged on the second air heater (20).

8. The waste heat recovery system for a garbage incinerator boiler according to claim 7, characterized in that: Also includes: A plurality of flow regulating and distributing devices (22) are provided, wherein the plurality of flow regulating and distributing devices (22) are respectively arranged on the ninth pipeline (21) and the third pipeline (6), and the flow regulating and distributing devices (22) are used to regulate the distribution of water flow to the first air heater (5) and the second air heater (20).

9. The waste heat recovery system of a garbage incinerator boiler according to claim 5, characterized in that: The pump assembly (1) further comprises: A three-way pipe (23), a first end of which is connected to the first circulation pump (13), a second end of which is connected to the third pipeline (6), and a third end of which is used for adding high-temperature water; The wall temperature regulating device (8) comprises: a regulating valve (24), arranged on the fourth pipeline (7), the regulating valve (24) being used to adjust the amount of high-temperature water added; A temperature controller (25) is arranged on the fourth pipeline (7), and the temperature controller (25) is used to detect the inner wall temperature of the flue gas heat exchanger (3).

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