Energy-saving system for cooling circulating water of updraft fixed bed biomass gasifier

Abstract

The utility model relates to the technical field of gasification furnaces, in particular to an energy-saving system for cooling circulating water of an updraft type fixed bed biomass gasification furnace, which comprises a gasification furnace and a water return tank connected with a water outlet of the cooling circulating water in the gasification furnace. The water supply tank is connected with a water inlet of cooling circulating water in the gasification furnace; one end of the heat exchanger is connected with the water supply tank, the other end of the heat exchanger is connected with a deaerator, and a water inlet pipe for softening water is arranged at the water inlet end of the heat exchanger. According to the device, cooling water cooled by the cooling furnace is introduced into the heat exchanger to increase the temperature of normal-temperature softened water to about 40 DEG C, and then the heated softened water is fed into the deaerator to be heated together with steam to a saturation temperature under corresponding pressure for deaeration treatment; and heat brought by circulating cooling water is indirectly used to reduce the use amount of steam.

Description

Technical Field

[0001] The utility model relates to the technical field of gasifiers, in particular to an energy-saving system for the cooling circulating water of an updraft fixed-bed biomass gasifier. Background Art

[0002] Biomass raw materials have a high volatile fraction value and are easy to gasify, but their ash melting point is relatively low (900 °C); during the gasification process of biomass, when the raw material is heated to 250 °C, volatile components begin to be released, and more than 80% of the volatile components have been released at 350 °C, forming coke; therefore, the reaction temperature of the gasification center temperature in the furnace is as high as 700 - 800 °C, otherwise a large amount of coke will be precipitated, seriously reducing the gasification efficiency.

[0003] A circulating water system is arranged in the updraft fixed-bed biomass gasifier. Its function is to cool the gasifier body to prevent damage to the gasifier furnace barrel due to excessive temperature. At the same time, it isolates the outer wall of the high-temperature gasifier furnace barrel to prevent accidents where people are scalded when contacting the outer wall of the gasifier.

[0004] When the load of the gasifier is high, the temperature of the furnace body exceeds the standard, and the consumption of circulating cooling water is relatively large. It is necessary to add the amount of cooling circulating water irregularly to ensure that the temperature of the furnace body remains within the safe range. Currently, the circulating water system in the gasifier has a single function, and its cooling water is only used for cooling the gasifier, which causes a certain degree of energy waste. Therefore, we propose an energy-saving system for the cooling circulating water of an updraft fixed-bed biomass gasifier to solve the above problems. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the defect that the circulating water system in the existing gasifier has a single function, and its cooling water is only used for cooling the gasifier, which causes a certain degree of energy waste, and to propose an energy-saving system for the cooling circulating water of an updraft fixed-bed biomass gasifier.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An energy-saving system for the cooling circulating water of an updraft fixed-bed biomass gasifier includes a gasifier, and also includes

[0008] A return water tank, which is connected to the outlet of the cooling circulating water in the gasifier;

[0009] A feed water tank, which is connected to the inlet of the cooling circulating water in the gasifier;

[0010] A heat exchanger, one end of which is connected to the feed water tank, and the other end of the heat exchanger is connected to a deaerator, and a water inlet pipe for softened water is arranged at the water inlet end of the heat exchanger.

[0011] As a preferred technical solution of the present utility model, a steam inlet is provided on the deaerator, and a water outlet, a sewage outlet and an oxygen evacuation port are also provided on the deaerator.

[0012] As a preferred technical solution of the present utility model, a rotating film tube is provided inside the deaerator. The bottom end of the rotating film tube is provided with a base having a frustum-shaped cross section. Water passes through the rotating film tube, and the formed water film skirt falls and meets the rising steam flow. The formed water film skirt greatly increases the heat exchange area between water and steam, and strengthens the effect of steam-water heat exchange.

[0013] As a preferred technical solution of the present utility model, it further includes a feed water pump. The feed water pump is installed at the outer end of the feed water tank, and the output end of the feed water pump is connected to the water inlet of the cooling circulating water in the gasifier, so that the whole cooling water circulates through the feed water pump.

[0014] As a preferred technical solution of the present utility model, a jacket is provided inside the gasifier, and the cooling circulating water is located in the jacket. The jacket is used for the flow of the cooling circulating water.

[0015] The beneficial effects of the present utility model are:

[0016] In this device, the cooling water after cooling the cooling furnace is introduced into the heat exchanger to raise the temperature of the normal temperature softened water to about 40°C. Then, the heated softened water is sent into the deaerator to be heated with steam to the saturation temperature under the corresponding pressure for deaeration treatment. The heat brought by the circulating cooling water is indirectly used to reduce the steam consumption. In this way, both the steam consumption can be reduced, and the heat energy of the circulating cooling water can be utilized. After heat exchange and cooling, it is then transported into the feed water tank for the gasifier to recycle, achieving the purpose of energy saving. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of an energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier proposed by the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the inside of the deaerator in an energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier proposed by the present utility model. Detailed Embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0020] Refer to Figure 1-2, an energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier, comprising a gasifier, a return water tank, a feed water tank, a heat exchanger and a deaerator. A jacket is arranged inside the gasifier, and the cooling circulating water is located in the jacket. The jacket is used for the flow of the cooling circulating water. The return water tank is connected to the outlet of the cooling circulating water in the gasifier, and the feed water tank is connected to the inlet of the cooling circulating water in the gasifier. One end of the heat exchanger is connected to the feed water tank, and the other end of the heat exchanger is connected to a deaerator. And a water inlet pipe for softened water is arranged at the water inlet end of the heat exchanger. A steam inlet is arranged on the deaerator, and an outlet, a blowdown port and an oxygen vent are also arranged on the deaerator;

[0021] It further comprises a feed water pump. The feed water pump is installed at the outer end of the feed water tank, and the output end of the feed water pump is connected to the inlet of the cooling circulating water in the gasifier, so that the whole cooling water circulates through the feed water pump;

[0022] Wherein, a rotating film tube is arranged inside the deaerator. The bottom end of the rotating film tube is provided with a base with a frustum-shaped vertical section. Water passes through the rotating film tube, and the formed water film skirt falls and meets the rising steam flow. The formed water film skirt greatly increases the heat exchange area between water and steam and strengthens the effect of steam-water heat exchange.

[0023] In this embodiment: when the load of the gasifier is relatively high, the temperature of the furnace body exceeds the standard, and the consumption of the circulating cooling water is relatively large. It is necessary to add the amount of the cooling circulating water irregularly to ensure that the temperature of the furnace body is kept within the safe range.

[0024] When the inner cylinder of the gasifier is protected by the water jacket, the circulating cooling water is heated to 80-90 °C after exchanging heat with the furnace cylinder, and then this part of the cooling water is passed into the heat exchanger to raise the temperature of the normal-temperature softened water to about 40 °C. Then the heated softened water is sent into the deaerator to be heated to the saturation temperature under the corresponding pressure together with the steam for deaeration treatment.

[0025] Wherein, the rotating film tube is adopted to increase the contact surface between steam and water. Water passes through the rotating film tube, and the formed water film skirt falls and meets the rising steam flow. The formed water film skirt greatly increases the heat exchange area between water and steam and strengthens the effect of steam-water heat exchange. When the water forming the water film skirt continues to flow through the randomly stacked packing layer after heat exchange, it is further heated by the steam. At this time, the gas dissolved in the water is precipitated to achieve the purpose of deaeration.

[0026] Since the heat brought by the indirect use of the circulating cooling water is used, the consumption of steam will be reduced. In this way, both the steam consumption can be reduced and the heat energy of the circulating cooling water can be utilized. After heat exchange and cooling, it is then transported into the feed water tank for the gasifier to recycle, achieving the purpose of energy saving.

[0027] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. An energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier, comprising a gasifier, characterized in that, Further comprising a water return tank connected to the outlet of the cooling circulating water in the gasifier; a water supply tank connected to the inlet of the cooling circulating water in the gasifier; a heat exchanger, one end of the heat exchanger is connected to the water supply tank, the other end of the heat exchanger is connected to a deaerator, and a water inlet pipe for softened water is provided at the water inlet end of the heat exchanger.

2. The energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier according to claim 1, characterized in that, The deaerator is provided with a steam inlet, and the deaerator is also provided with a water outlet, a blowdown port and an oxygen vent port.

3. The energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier according to claim 2, characterized in that, A rotary film tube is arranged in the deaerator, and a base with a frustum-shaped vertical cross-section is arranged at the bottom end of the rotary film tube.

4. An energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier according to claim 1, characterized in that, Further comprising a feed water pump installed at the outer end of the water supply tank, and the output end of the feed water pump is connected to the inlet of the cooling circulating water in the gasifier.

5. An energy-saving system for the cooling circulating water of an up-draft fixed-bed biomass gasifier according to claim 1, characterized in that A jacket is arranged inside the gasifier, and the cooling circulating water is located in the jacket.

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